facade/telephony/TelephonyManagerFacade.java

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.googlecode.android_scripting.facade.telephony;

import android.annotation.Nullable;
import android.app.Service;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.net.TrafficStats;
import android.net.Uri;
import android.os.RemoteException;
import android.provider.Telephony;
import android.sysprop.TelephonyProperties;
import android.telephony.AvailableNetworkInfo;
import android.telephony.CellInfo;
import android.telephony.CellLocation;
import android.telephony.NeighboringCellInfo;
import android.telephony.PhoneStateListener;
import android.telephony.ServiceState;
import android.telephony.SignalStrength;
import android.telephony.SubscriptionManager;
import android.telephony.TelephonyManager;

import com.android.internal.telephony.RILConstants;

import com.google.common.io.BaseEncoding;
import com.googlecode.android_scripting.Log;
import com.googlecode.android_scripting.facade.AndroidFacade;
import com.googlecode.android_scripting.facade.EventFacade;
import com.googlecode.android_scripting.facade.FacadeManager;
import com.googlecode.android_scripting.facade.telephony.TelephonyStateListeners
                                                   .ActiveDataSubIdChangeListener;
import com.googlecode.android_scripting.facade.telephony.TelephonyStateListeners
                                                   .CallStateChangeListener;
import com.googlecode.android_scripting.facade.telephony.TelephonyStateListeners
                                                   .CellInfoChangeListener;
import com.googlecode.android_scripting.facade.telephony.TelephonyStateListeners
                                                   .DataConnectionRealTimeInfoChangeListener;
import com.googlecode.android_scripting.facade.telephony.TelephonyStateListeners
                                                   .DataConnectionStateChangeListener;
import com.googlecode.android_scripting.facade.telephony.TelephonyStateListeners
                                                   .DisplayInfoStateChangeListener;
import com.googlecode.android_scripting.facade.telephony.TelephonyStateListeners
                                                   .ServiceStateChangeListener;
import com.googlecode.android_scripting.facade.telephony.TelephonyStateListeners
                                                   .SignalStrengthChangeListener;
import com.googlecode.android_scripting.facade.telephony.TelephonyStateListeners
                                                   .VoiceMailStateChangeListener;
import com.googlecode.android_scripting.jsonrpc.RpcReceiver;
import com.googlecode.android_scripting.rpc.Rpc;
import com.googlecode.android_scripting.rpc.RpcDefault;
import com.googlecode.android_scripting.rpc.RpcOptional;
import com.googlecode.android_scripting.rpc.RpcParameter;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.concurrent.Executor;

/**
 * Exposes TelephonyManager functionality.
 *
 */
public class TelephonyManagerFacade extends RpcReceiver {

    private final Service mService;
    private final AndroidFacade mAndroidFacade;
    private final EventFacade mEventFacade;
    private final TelephonyManager mTelephonyManager;
    private final SubscriptionManager mSubscriptionManager;
    private List<AvailableNetworkInfo> availableNetworkList;
    private HashMap<Integer, StateChangeListener> mStateChangeListeners =
                             new HashMap<Integer, StateChangeListener>();

    private static final String[] sProjection = new String[] {
            Telephony.Carriers._ID, // 0
            Telephony.Carriers.NAME, // 1
            Telephony.Carriers.APN, // 2
            Telephony.Carriers.PROXY, // 3
            Telephony.Carriers.PORT, // 4
            Telephony.Carriers.USER, // 5
            Telephony.Carriers.SERVER, // 6
            Telephony.Carriers.PASSWORD, // 7
            Telephony.Carriers.MMSC, // 8
            Telephony.Carriers.MCC, // 9
            Telephony.Carriers.MNC, // 10
            Telephony.Carriers.NUMERIC, // 11
            Telephony.Carriers.MMSPROXY,// 12
            Telephony.Carriers.MMSPORT, // 13
            Telephony.Carriers.AUTH_TYPE, // 14
            Telephony.Carriers.TYPE, // 15
            Telephony.Carriers.PROTOCOL, // 16
            Telephony.Carriers.CARRIER_ENABLED, // 17
            Telephony.Carriers.BEARER_BITMASK, // 18
            Telephony.Carriers.ROAMING_PROTOCOL, // 19
            Telephony.Carriers.MVNO_TYPE, // 20
            Telephony.Carriers.MVNO_MATCH_DATA // 21
    };

    public TelephonyManagerFacade(FacadeManager manager) {
        super(manager);
        mService = manager.getService();
        mTelephonyManager =
                (TelephonyManager) mService.getSystemService(Context.TELEPHONY_SERVICE);
        mAndroidFacade = manager.getReceiver(AndroidFacade.class);
        mEventFacade = manager.getReceiver(EventFacade.class);
        mSubscriptionManager = SubscriptionManager.from(mService);
    }

    /**
    * Reset TelephonyManager settings to factory default.
    * @param subId the subriber id to be reset, use default id if not provided.
    */
    @Rpc(description = "Resets TelephonyManager settings to factory default.")
    public void telephonyFactoryReset(
            @RpcOptional @RpcParameter(name = "subId") Integer subId) {
        if (subId == null) {
            subId = SubscriptionManager.getDefaultVoiceSubscriptionId();
        }
        mTelephonyManager.factoryReset(subId);
    }

    /**
    * Reset TelephonyManager settings to factory default.
    * @param subId the subriber id to be reset, use default id if not provided.
    */
    @Rpc(description = "Resets Telephony and IMS settings to factory default.")
    public void telephonyResetSettings(
            @RpcOptional @RpcParameter(name = "subId") Integer subId) {
        if (subId == null) {
            subId = SubscriptionManager.getDefaultVoiceSubscriptionId();
        }
        mTelephonyManager.createForSubscriptionId(subId).resetSettings();
    }

    @Rpc(description = "Set network preference.")
    public boolean telephonySetPreferredNetworkTypes(
        @RpcParameter(name = "nwPreference") String nwPreference) {
        return telephonySetPreferredNetworkTypesForSubscription(nwPreference,
                SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Set network preference for subscription.")
    public boolean telephonySetPreferredNetworkTypesForSubscription(
            @RpcParameter(name = "nwPreference") String nwPreference,
            @RpcParameter(name = "subId") Integer subId) {
        int networkPreferenceInt = TelephonyUtils.getNetworkModeIntfromString(
            nwPreference);
        if (RILConstants.RIL_ERRNO_INVALID_RESPONSE != networkPreferenceInt) {
            return mTelephonyManager.setPreferredNetworkType(
                subId, networkPreferenceInt);
        } else {
            return false;
        }
    }

    /**
    * Set network selection mode to automatic for subscriber.
    * @param subId the subriber id to be set.
    */
    @Rpc(description = "Set network selection mode to automatic for subscriber.")
    public void telephonySetNetworkSelectionModeAutomaticForSubscription(
            @RpcParameter(name = "subId") Integer subId) {
        mTelephonyManager.setNetworkSelectionModeAutomatic();
    }

    @Rpc(description = "Get network preference.")
    public String telephonyGetPreferredNetworkTypes() {
        return telephonyGetPreferredNetworkTypesForSubscription(
                SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Get network preference for subscription.")
    public String telephonyGetPreferredNetworkTypesForSubscription(
            @RpcParameter(name = "subId") Integer subId) {
        int networkPreferenceInt = mTelephonyManager.getPreferredNetworkType(subId);
        return TelephonyUtils.getNetworkModeStringfromInt(networkPreferenceInt);
    }

    @Rpc(description = "Get current voice network type")
    public String telephonyGetCurrentVoiceNetworkType() {
        return telephonyGetCurrentVoiceNetworkTypeForSubscription(
                SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Get current voice network type for subscription")
    public String telephonyGetCurrentVoiceNetworkTypeForSubscription(
            @RpcParameter(name = "subId") Integer subId) {
        return TelephonyUtils.getNetworkTypeString(
            mTelephonyManager.getVoiceNetworkType(subId));
    }

    @Rpc(description = "Get current data network type")
    public String telephonyGetCurrentDataNetworkType() {
        return telephonyGetCurrentDataNetworkTypeForSubscription(
                SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Get current data network type for subscription")
    public String telephonyGetCurrentDataNetworkTypeForSubscription(
            @RpcParameter(name = "subId") Integer subId) {
        return TelephonyUtils.getNetworkTypeString(
            mTelephonyManager.getDataNetworkType(subId));
    }

    @Rpc(description = "Get if phone have voice capability")
    public Boolean telephonyIsVoiceCapable() {
        return mTelephonyManager.isVoiceCapable();
    }

    @Rpc(description = "Get preferred network setting for " +
                       "default subscription ID .Return value is integer.")
    public int telephonyGetPreferredNetworkTypeInteger() {
        return telephonyGetPreferredNetworkTypeIntegerForSubscription(
                                         SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Get preferred network setting for " +
                       "specified subscription ID .Return value is integer.")
    public int telephonyGetPreferredNetworkTypeIntegerForSubscription(
               @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getPreferredNetworkType(subId);
    }

    @Rpc(description = "Starts tracking call state change" +
                       "for default subscription ID.")
    public Boolean telephonyStartTrackingCallState() {
        return telephonyStartTrackingCallStateForSubscription(
                              SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Starts tracking call state change" +
                       "for specified subscription ID.")
    public Boolean telephonyStartTrackingCallStateForSubscription(
                @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, true);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mCallStateChangeListener,
            CallStateChangeListener.sListeningStates);
        return true;
    }

    @Rpc(description = "Starts tracking cell info change" +
                       "for default subscription ID.")
    public Boolean telephonyStartTrackingCellInfoChange() {
        return telephonyStartTrackingCellInfoChangeForSubscription(
                              SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Starts tracking cell info change" +
                       "for specified subscription ID.")
    public Boolean telephonyStartTrackingCellInfoChangeForSubscription(
                @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, true);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mCellInfoChangeListener,
            PhoneStateListener.LISTEN_CELL_INFO);
        return true;
    }

    @Rpc(description = "Starts tracking active opportunistic data change" +
                       "for default subscription ID.")
    public Boolean telephonyStartTrackingActiveDataChange() {
        return telephonyStartTrackingActiveDataChangeForSubscription(
                              SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Starts tracking active opportunistic data change" +
                       "for specified subscription ID.")
    public Boolean telephonyStartTrackingActiveDataChangeForSubscription(
                @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, true);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mActiveDataSubIdChangeListener,
            PhoneStateListener.LISTEN_ACTIVE_DATA_SUBSCRIPTION_ID_CHANGE);
        return true;
    }

    @Rpc(description = "Starts tracking display info change" +
                       "for default subscription ID.")
    public Boolean telephonyStartTrackingDisplayInfoChange() {
        return telephonyStartTrackingDisplayInfoChangeForSubscription(
                              SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Starts tracking display info change" +
                       "for specified subscription ID.")
    public Boolean telephonyStartTrackingDisplayInfoChangeForSubscription(
                @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, true);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mDisplayInfoStateChangeListener,
            PhoneStateListener.LISTEN_DISPLAY_INFO_CHANGED);
        return true;
    }

    @Rpc(description = "Turn on/off precise listening on fore/background or" +
                       " ringing calls for default voice subscription ID.")
    public Boolean telephonyAdjustPreciseCallStateListenLevel(
            @RpcParameter(name = "type") String type,
            @RpcParameter(name = "listen") Boolean listen) {
        return telephonyAdjustPreciseCallStateListenLevelForSubscription(type, listen,
                                 SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Turn on/off precise listening on fore/background or" +
                       " ringing calls for specified subscription ID.")
    public Boolean telephonyAdjustPreciseCallStateListenLevelForSubscription(
            @RpcParameter(name = "type") String type,
            @RpcParameter(name = "listen") Boolean listen,
            @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, true);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }

        if (type.equals(TelephonyConstants.PRECISE_CALL_STATE_LISTEN_LEVEL_FOREGROUND)) {
            listener.mCallStateChangeListener.listenForeground = listen;
        } else if (type.equals(TelephonyConstants.PRECISE_CALL_STATE_LISTEN_LEVEL_RINGING)) {
            listener.mCallStateChangeListener.listenRinging = listen;
        } else if (type.equals(TelephonyConstants.PRECISE_CALL_STATE_LISTEN_LEVEL_BACKGROUND)) {
            listener.mCallStateChangeListener.listenBackground = listen;
        } else {
            throw new IllegalArgumentException("Invalid listen level type " + type);
        }

        return true;
    }

    @Rpc(description = "Stops tracking cell info change " +
            "for default voice subscription ID.")
    public Boolean telephonyStopTrackingCellInfoChange() {
        return telephonyStopTrackingCellInfoChangeForSubscription(
                SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Stops tracking cell info change " +
                       "for specified subscription ID.")
    public Boolean telephonyStopTrackingCellInfoChangeForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, false);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mCellInfoChangeListener,
            PhoneStateListener.LISTEN_NONE);
        return true;
    }

    @Rpc(description = "Stops tracking active opportunistic data " +
            "for default subscription ID.")
    public Boolean telephonyStopTrackingActiveDataChange() {
        return telephonyStopTrackingActiveDataChangeForSubscription(
                SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Stops tracking active opportunistic data " +
                       "for specified subscription ID.")
    public Boolean telephonyStopTrackingActiveDataChangeForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, false);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mActiveDataSubIdChangeListener,
            PhoneStateListener.LISTEN_NONE);
        return true;
    }

    @Rpc(description = "Stops tracking display info change " +
                       "for default subscription ID.")
    public Boolean telephonyStopTrackingDisplayInfoChange() {
        return telephonyStopTrackingDisplayInfoChangeForSubscription(
                SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Stops tracking display info change " +
                       "for specified subscription ID.")
    public Boolean telephonyStopTrackingDisplayInfoChangeForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, false);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mDisplayInfoStateChangeListener,
            PhoneStateListener.LISTEN_NONE);
        return true;
    }

    @Rpc(description = "Stops tracking call state change " +
            "for default voice subscription ID.")
    public Boolean telephonyStopTrackingCallStateChange() {
        return telephonyStopTrackingCallStateChangeForSubscription(
                SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Stops tracking call state change " +
                       "for specified subscription ID.")
    public Boolean telephonyStopTrackingCallStateChangeForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, false);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mCallStateChangeListener,
            PhoneStateListener.LISTEN_NONE);
        return true;
    }

    @Rpc(description = "Starts tracking data connection real time info change" +
                       "for default subscription ID.")
    public Boolean telephonyStartTrackingDataConnectionRTInfoChange() {
        return telephonyStartTrackingDataConnectionRTInfoChangeForSubscription(
                                 SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Starts tracking data connection real time info change" +
                       "for specified subscription ID.")
    public Boolean telephonyStartTrackingDataConnectionRTInfoChangeForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, true);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mDataConnectionRTInfoChangeListener,
            DataConnectionRealTimeInfoChangeListener.sListeningStates);
        return true;
    }

    @Rpc(description = "Stops tracking data connection real time info change" +
                       "for default subscription ID.")
    public Boolean telephonyStopTrackingDataConnectionRTInfoChange() {
        return telephonyStopTrackingDataConnectionRTInfoChangeForSubscription(
                                 SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Stops tracking data connection real time info change" +
                       "for specified subscription ID.")
    public Boolean telephonyStopTrackingDataConnectionRTInfoChangeForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, false);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mDataConnectionRTInfoChangeListener,
            PhoneStateListener.LISTEN_NONE);
        return true;
    }

    @Rpc(description = "Starts tracking data connection state change" +
                       "for default subscription ID..")
    public Boolean telephonyStartTrackingDataConnectionStateChange() {
        return telephonyStartTrackingDataConnectionStateChangeForSubscription(
                                 SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Starts tracking data connection state change" +
                       "for specified subscription ID.")
    public Boolean telephonyStartTrackingDataConnectionStateChangeForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, true);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mDataConnectionStateChangeListener,
            DataConnectionStateChangeListener.sListeningStates);
        return true;
    }

    @Rpc(description = "Stops tracking data connection state change " +
                       "for default subscription ID..")
    public Boolean telephonyStopTrackingDataConnectionStateChange() {
        return telephonyStopTrackingDataConnectionStateChangeForSubscription(
                                 SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Stops tracking data connection state change " +
                       "for specified subscription ID..")
    public Boolean telephonyStopTrackingDataConnectionStateChangeForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, false);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mDataConnectionStateChangeListener,
            PhoneStateListener.LISTEN_NONE);
        return true;
    }

    @Rpc(description = "Starts tracking service state change " +
                       "for default subscription ID.")
    public Boolean telephonyStartTrackingServiceStateChange() {
        return telephonyStartTrackingServiceStateChangeForSubscription(
                                 SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Starts tracking service state change " +
                       "for specified subscription ID.")
    public Boolean telephonyStartTrackingServiceStateChangeForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, true);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mServiceStateChangeListener,
            ServiceStateChangeListener.sListeningStates);
        return true;
    }

    @Rpc(description = "Stops tracking service state change " +
                       "for default subscription ID.")
    public Boolean telephonyStopTrackingServiceStateChange() {
        return telephonyStopTrackingServiceStateChangeForSubscription(
                                 SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Stops tracking service state change " +
                       "for specified subscription ID.")
    public Boolean telephonyStopTrackingServiceStateChangeForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, false);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mServiceStateChangeListener,
            PhoneStateListener.LISTEN_NONE);
            return true;
    }

    @Rpc(description = "Starts tracking signal strength change " +
                       "for default subscription ID.")
    public Boolean telephonyStartTrackingSignalStrengthChange() {
        return telephonyStartTrackingSignalStrengthChangeForSubscription(
                                 SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Starts tracking signal strength change " +
                       "for specified subscription ID.")
    public Boolean telephonyStartTrackingSignalStrengthChangeForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, true);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mSignalStrengthChangeListener,
            SignalStrengthChangeListener.sListeningStates);
        return true;
    }

    @Rpc(description = "Stops tracking signal strength change " +
                       "for default subscription ID.")
    public Boolean telephonyStopTrackingSignalStrengthChange() {
        return telephonyStopTrackingSignalStrengthChangeForSubscription(
                                 SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Stops tracking signal strength change " +
                       "for specified subscription ID.")
    public Boolean telephonyStopTrackingSignalStrengthChangeForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, false);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mSignalStrengthChangeListener,
            PhoneStateListener.LISTEN_NONE);
        return true;
    }

    @Rpc(description = "Starts tracking voice mail state change " +
                       "for default subscription ID.")
    public Boolean telephonyStartTrackingVoiceMailStateChange() {
        return telephonyStartTrackingVoiceMailStateChangeForSubscription(
                                 SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Starts tracking voice mail state change " +
                       "for specified subscription ID.")
    public Boolean telephonyStartTrackingVoiceMailStateChangeForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, true);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mVoiceMailStateChangeListener,
            VoiceMailStateChangeListener.sListeningStates);
        return true;
    }

    @Rpc(description = "Stops tracking voice mail state change " +
                       "for default subscription ID.")
    public Boolean telephonyStopTrackingVoiceMailStateChange() {
        return telephonyStopTrackingVoiceMailStateChangeForSubscription(
                                 SubscriptionManager.DEFAULT_SUBSCRIPTION_ID);
    }

    @Rpc(description = "Stops tracking voice mail state change " +
                       "for specified subscription ID.")
    public Boolean telephonyStopTrackingVoiceMailStateChangeForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, false);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return false;
        }
        mTelephonyManager.createForSubscriptionId(subId).listen(
            listener.mVoiceMailStateChangeListener,
            PhoneStateListener.LISTEN_NONE);
        return true;
    }

    @Rpc(description = "Answers an incoming ringing call.")
    public void telephonyAnswerCall() throws RemoteException {
        mTelephonyManager.silenceRinger();
        mTelephonyManager.answerRingingCall();
    }

    @Rpc(description = "Returns the radio on/off state.")
    public Boolean telephonyIsRadioOn() {
        return mTelephonyManager.isRadioOn();
    }

    @Rpc(description = "Sets the radio to an on/off state.")
    public Boolean telephonySetRadioPower(
        @RpcParameter(name = "turnOn") boolean turnOn) {
        return mTelephonyManager.setRadioPower(turnOn);
    }

    @Rpc(description = "Returns the current cell location.")
    public CellLocation telephonyGetCellLocation() {
        return mTelephonyManager.getCellLocation();
    }

    /**
     *  Returns carrier id of the current subscription.
     * @return Carrier id of the current subscription.
     */
    @Rpc(description = "Returns the numeric CarrierId for current subscription")
    public int telephonyGetSimCarrierId() {
        return mTelephonyManager.getSimCarrierId();
    }

    /**
     *  Returns carrier id name of the current subscription.
     * @return Carrier id name of the current subscription
     */
    @Rpc(description = "Returns Carrier Name for current subscription")
    public CharSequence telephonyGetSimCarrierIdName() {
        return mTelephonyManager.getSimCarrierIdName();
    }

    @Rpc(description = "Returns the numeric name (MCC+MNC) of registered operator." +
                       "for default subscription ID")
    public String telephonyGetNetworkOperator() {
        return telephonyGetNetworkOperatorForSubscription(
                        SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Returns the numeric name (MCC+MNC) of registered operator" +
                       "for specified subscription ID.")
    public String telephonyGetNetworkOperatorForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getNetworkOperator(subId);
    }

    @Rpc(description = "Returns the alphabetic name of current registered operator" +
                       "for specified subscription ID.")
    public String telephonyGetNetworkOperatorName() {
        return telephonyGetNetworkOperatorNameForSubscription(
                        SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Returns the alphabetic name of registered operator " +
                       "for specified subscription ID.")
    public String telephonyGetNetworkOperatorNameForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getNetworkOperatorName(subId);
    }

    @Rpc(description = "Returns the current RAT in use on the device.+" +
                       "for default subscription ID")
    public String telephonyGetNetworkType() {

        Log.d("sl4a:getNetworkType() is deprecated!" +
                "Please use getVoiceNetworkType()" +
                " or getDataNetworkTpe()");

        return telephonyGetNetworkTypeForSubscription(
                       SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Returns the current RAT in use on the device" +
            " for a given Subscription.")
    public String telephonyGetNetworkTypeForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {

        Log.d("sl4a:getNetworkTypeForSubscriber() is deprecated!" +
                "Please use getVoiceNetworkType()" +
                " or getDataNetworkTpe()");

        return TelephonyUtils.getNetworkTypeString(
            mTelephonyManager.getNetworkType(subId));
    }

    @Rpc(description = "Returns the current voice RAT for" +
            " the default voice subscription.")
    public String telephonyGetVoiceNetworkType() {
        return telephonyGetVoiceNetworkTypeForSubscription(
                         SubscriptionManager.getDefaultVoiceSubscriptionId());
    }

    @Rpc(description = "Returns the current voice RAT for" +
            " the specified voice subscription.")
    public String telephonyGetVoiceNetworkTypeForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return TelephonyUtils.getNetworkTypeString(
            mTelephonyManager.getVoiceNetworkType(subId));
    }

    @Rpc(description = "Returns the current data RAT for" +
            " the defaut data subscription")
    public String telephonyGetDataNetworkType() {
        return telephonyGetDataNetworkTypeForSubscription(
                         SubscriptionManager.getDefaultDataSubscriptionId());
    }

    @Rpc(description = "Returns the current data RAT for" +
            " the specified data subscription")
    public String telephonyGetDataNetworkTypeForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return TelephonyUtils.getNetworkTypeString(
            mTelephonyManager.getDataNetworkType(subId));
    }

    @Rpc(description = "Returns the device phone type.")
    public String telephonyGetPhoneType() {
        return TelephonyUtils.getPhoneTypeString(
            mTelephonyManager.getPhoneType());
    }

    @Rpc(description = "Return if setAlwaysAllowMMSData is set correctly")
    public boolean telephonySetAlwaysAllowMmsData(
            @RpcParameter(name = "subId") Integer subId,
            @RpcParameter(name = "alwaysAllow") Boolean alwaysAllow) {
        boolean wasAlwaysAllow = mTelephonyManager.isMobileDataPolicyEnabled(
                TelephonyManager.MOBILE_DATA_POLICY_MMS_ALWAYS_ALLOWED);
        mTelephonyManager.createForSubscriptionId(subId)
                .setMobileDataPolicyEnabled(
                        TelephonyManager.MOBILE_DATA_POLICY_MMS_ALWAYS_ALLOWED, alwaysAllow);
        return wasAlwaysAllow == alwaysAllow;
    }

    /**
    * Sets Data Roaming flag for a particular sub Id
    * @param subId the subscriber id
    * @param isEnabled can you set to true or false
    */
    @Rpc(description = "Sets data roaming for a sub Id")
    public void telephonySetDataRoamingEnabled(
            @RpcParameter(name = "subId") Integer subId,
            @RpcParameter(name = "isEnabled") Boolean isEnabled) {
        mTelephonyManager.createForSubscriptionId(subId).setDataRoamingEnabled(isEnabled);
    }

    @Rpc(description = "Returns preferred opportunistic data subscription Id")
    public Integer telephonyGetPreferredOpportunisticDataSubscription() {
        return mTelephonyManager.getPreferredOpportunisticDataSubscription();
    }

    @Rpc(description = "Sets preferred opportunistic data subscription Id")
    public void telephonySetPreferredOpportunisticDataSubscription(
            @RpcParameter(name = "subId") Integer subId,
            @RpcParameter(name = "needValidation") Boolean needValidation) {
        mTelephonyManager.setPreferredOpportunisticDataSubscription(
                   subId, needValidation, null, null);
    }

    @Rpc(description = "Updates Available Networks")
    public void telephonyUpdateAvailableNetworks(
            @RpcParameter(name = "subId") Integer subId) {

        availableNetworkList = new ArrayList<>();
        List<String> mccmmc = new ArrayList<String>();
        List<Integer> bands = new ArrayList<Integer>();

        availableNetworkList.add(
            new AvailableNetworkInfo(
                subId,
                AvailableNetworkInfo.PRIORITY_HIGH,
                mccmmc,
                bands));

        mTelephonyManager.updateAvailableNetworks(availableNetworkList, null, null);
    }

    /**
    * Get device phone type for a subscription.
    * @param subId the subscriber id
    * @return the phone type string for the subscriber.
    */
    @Rpc(description = "Returns the device phone type for a subscription.")
    public String telephonyGetPhoneTypeForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return TelephonyUtils.getPhoneTypeString(
            mTelephonyManager.getCurrentPhoneType(subId));
    }

    @Rpc(description = "Returns the MCC for default subscription ID")
    public String telephonyGetSimCountryIso() {
         return telephonyGetSimCountryIsoForSubscription(
                      SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Returns the MCC for specified subscription ID")
    public String telephonyGetSimCountryIsoForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getSimCountryIso(subId);
    }

    @Rpc(description = "Returns the MCC+MNC for default subscription ID")
    public String telephonyGetSimOperator() {
        return telephonyGetSimOperatorForSubscription(
                  SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Returns the MCC+MNC for specified subscription ID")
    public String telephonyGetSimOperatorForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getSimOperator(subId);
    }

    @Rpc(description = "Returns the Service Provider Name (SPN)" +
                       "for default subscription ID")
    public String telephonyGetSimOperatorName() {
        return telephonyGetSimOperatorNameForSubscription(
                  SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Returns the Service Provider Name (SPN)" +
                       " for specified subscription ID.")
    public String telephonyGetSimOperatorNameForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getSimOperatorName(subId);
    }

    @Rpc(description = "Returns the serial number of the SIM for " +
                       "default subscription ID, or Null if unavailable")
    public String telephonyGetSimSerialNumber() {
        return telephonyGetSimSerialNumberForSubscription(
                  SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Returns the serial number of the SIM for " +
                       "specified subscription ID, or Null if unavailable")
    public String telephonyGetSimSerialNumberForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getSimSerialNumber(subId);
    }

    /**
     * Set SIM card power state.
     *
     * @param state  State of SIM (0: power down, 1: power up, 2: pass through)
     **/
    @Rpc(description = "Set the SIM power state of the SIM card for default slot ID.")
    public void telephonySetSimPowerState(
                  @RpcParameter(name = "state") Integer state) {
        mTelephonyManager.setSimPowerState(state);
    }

    /**
     * Set SIM card power state.
     *
     * @param slotId SIM slot id
     * @param state  State of SIM (0: power down, 1: power up, 2: pass through)
     **/
    @Rpc(description = "Set the SIM power state for SIM slot slotId.")
    public void telephonySetSimStateForSlotId(
                  @RpcParameter(name = "slotId") Integer slotId,
                  @RpcParameter(name = "state") Integer state) {
        mTelephonyManager.setSimPowerStateForSlot(slotId, state);
    }

    @Rpc(description = "Returns the state of the SIM card for default slot ID.")
    public String telephonyGetSimState() {
        return telephonyGetSimStateForSlotId(
                  mTelephonyManager.getSlotIndex());
    }

    @Rpc(description = "Returns the state of the SIM card for specified slot ID.")
    public String telephonyGetSimStateForSlotId(
                  @RpcParameter(name = "slotId") Integer slotId) {
        return TelephonyUtils.getSimStateString(
            mTelephonyManager.getSimState(slotId));
    }

    /**
     * Switch device mode multisim
     *
     * @param numOfSims (1: single sim, 2: multi sim)
     **/
    @Rpc(description = "Switch configs to enable multi-sim or switch back to single-sim")
    public void telephonySwitchMultiSimConfig(
            @RpcParameter(name = "numOfSims")
            Integer numOfSims) {
        mTelephonyManager.switchMultiSimConfig(numOfSims.intValue());
    }

    /**
     * Gets device mode multisim
     *
     * @return phoneCount (1-single sim, 2-dual sim, 3-tri sim)
     **/
    @Rpc(description = "Returns if device is in Single, Dual, Tri SIM Mode")
    public Integer telephonyGetPhoneCount() {
        return mTelephonyManager.getPhoneCount();
    }

    @Rpc(description = "Get Authentication Challenge Response from a " +
            "given SIM Application")
    public String telephonyGetIccSimChallengeResponse(
            @RpcParameter(name = "appType") Integer appType,
            @RpcParameter(name = "authType") Integer authType,
            @RpcParameter(name = "hexChallenge") String hexChallenge) {
        return telephonyGetIccSimChallengeResponseForSubscription(
                SubscriptionManager.getDefaultSubscriptionId(), appType, authType, hexChallenge);
    }

    @Rpc(description = "Get Authentication Challenge Response from a " +
            "given SIM Application for a specified Subscription")
    public String telephonyGetIccSimChallengeResponseForSubscription(
            @RpcParameter(name = "subId") Integer subId,
            @RpcParameter(name = "appType") Integer appType,
            @RpcParameter(name = "authType") Integer authType,
            @RpcParameter(name = "hexChallenge") String hexChallenge) {

        try {
            String b64Data = BaseEncoding.base64().encode(BaseEncoding.base16().decode(hexChallenge));
            String b64Result = mTelephonyManager.getIccAuthentication(subId, appType, authType, b64Data);
            return (b64Result != null)
                    ? BaseEncoding.base16().encode(BaseEncoding.base64().decode(b64Result)) : null;
        } catch(Exception e) {
            Log.e("Exception in phoneGetIccSimChallengeResponseForSubscription" + e.toString());
            return null;
        }
    }

    /**
    * Supply the puk code and pin for locked SIM.
    * @param puk the puk code string
    * @param pin the puk pin string
    * @return    true or false for supplying the puk code and pin successfully or unsuccessfully.
    */
    @Rpc(description = "Supply Puk and Pin for locked SIM.")
    public boolean telephonySupplyPuk(
            @RpcParameter(name = "puk") String puk,
            @RpcParameter(name = "pin") String pin) {
        return mTelephonyManager.supplyPuk(puk, pin);
    }

    /**
    * Supply pin for locked SIM.
    * @param pin the puk pin string
    * @return    true or false for supplying the pin successfully or unsuccessfully.
    */
    @Rpc(description = "Supply Pin for locked SIM.")
    public boolean telephonySupplyPin(
            @RpcParameter(name = "pin") String pin) {
        return mTelephonyManager.supplyPin(pin);
    }

    @Rpc(description = "Returns the unique subscriber ID (such as IMSI) " +
            "for default subscription ID, or null if unavailable")
    public String telephonyGetSubscriberId() {
        return telephonyGetSubscriberIdForSubscription(
                SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Returns the unique subscriber ID (such as IMSI) " +
                       "for specified subscription ID, or null if unavailable")
    public String telephonyGetSubscriberIdForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getSubscriberId(subId);
    }

    @Rpc(description = "Retrieves the alphabetic id associated with the" +
                       " voice mail number for default subscription ID.")
    public String telephonyGetVoiceMailAlphaTag() {
        return telephonyGetVoiceMailAlphaTagForSubscription(
                   SubscriptionManager.getDefaultSubscriptionId());
    }


    @Rpc(description = "Retrieves the alphabetic id associated with the " +
                       "voice mail number for specified subscription ID.")
    public String telephonyGetVoiceMailAlphaTagForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getVoiceMailAlphaTag(subId);
    }

    @Rpc(description = "Returns the voice mail number " +
                       "for default subscription ID; null if unavailable.")
    public String telephonyGetVoiceMailNumber() {
        return telephonyGetVoiceMailNumberForSubscription(
                   SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Returns the voice mail number " +
                        "for specified subscription ID; null if unavailable.")
    public String telephonyGetVoiceMailNumberForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getVoiceMailNumber(subId);
    }

    @Rpc(description = "Get voice message count for specified subscription ID.")
    public Integer telephonyGetVoiceMailCountForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getVoiceMessageCount(subId);
    }

    @Rpc(description = "Get voice message count for default subscription ID.")
    public Integer telephonyGetVoiceMailCount() {
        return mTelephonyManager.getVoiceMessageCount();
    }

    @Rpc(description = "Returns true if the device is in  roaming state" +
                       "for default subscription ID")
    public Boolean telephonyCheckNetworkRoaming() {
        return telephonyCheckNetworkRoamingForSubscription(
                             SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Returns true if the device is in roaming state " +
                       "for specified subscription ID")
    public Boolean telephonyCheckNetworkRoamingForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.isNetworkRoaming(subId);
    }

    @Rpc(description = "Returns the unique device ID such as MEID or IMEI " +
                       "for deault sim slot ID, null if unavailable")
    public String telephonyGetDeviceId() {
        return telephonyGetDeviceIdForSlotId(mTelephonyManager.getSlotIndex());
    }

    @Rpc(description = "Returns the unique device ID such as MEID or IMEI for" +
                       " specified slot ID, null if unavailable")
    public String telephonyGetDeviceIdForSlotId(
                  @RpcParameter(name = "slotId")
                  Integer slotId){
        return mTelephonyManager.getDeviceId(slotId);
    }

    @Rpc(description = "Returns the modem sw version, such as IMEI-SV;" +
                       " null if unavailable")
    public String telephonyGetDeviceSoftwareVersion() {
        return mTelephonyManager.getDeviceSoftwareVersion();
    }

    @Rpc(description = "Returns phone # string \"line 1\", such as MSISDN " +
                       "for default subscription ID; null if unavailable")
    public String telephonyGetLine1Number() {
        return mTelephonyManager.getLine1Number();
    }

    @Rpc(description = "Returns phone # string \"line 1\", such as MSISDN " +
                       "for specified subscription ID; null if unavailable")
    public String telephonyGetLine1NumberForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getLine1Number(subId);
    }

    @Rpc(description = "Returns the Alpha Tag for the default subscription " +
                       "ID; null if unavailable")
    public String telephonyGetLine1AlphaTag() {
        return mTelephonyManager.getLine1AlphaTag();
    }

    @Rpc(description = "Returns the Alpha Tag for the specified subscription " +
                       "ID; null if unavailable")
    public String telephonyGetLine1AlphaTagForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getLine1AlphaTag(subId);
    }

    @Rpc(description = "Set the Line1-number (phone number) and Alpha Tag" +
                       "for the default subscription")
    public Boolean telephonySetLine1Number(
                @RpcParameter(name = "number") String number,
                @RpcOptional
                @RpcParameter(name = "alphaTag") String alphaTag) {
        return mTelephonyManager.setLine1NumberForDisplay(alphaTag, number);
    }

    @Rpc(description = "Set the Line1-number (phone number) and Alpha Tag" +
                       "for the specified subscription")
    public Boolean telephonySetLine1NumberForSubscription(
                @RpcParameter(name = "subId") Integer subId,
                @RpcParameter(name = "number") String number,
                @RpcOptional
                @RpcParameter(name = "alphaTag") String alphaTag) {
        return mTelephonyManager.setLine1NumberForDisplay(subId, alphaTag, number);
    }

    @Rpc(description = "Returns the neighboring cell information of the device.")
    public List<NeighboringCellInfo> telephonyGetNeighboringCellInfo() {
        return mTelephonyManager.getNeighboringCellInfo();
    }

    @Rpc(description =  "Sets the minimum reporting interval for CellInfo" +
                        "0-as quickly as possible, 0x7FFFFFF-off")
    public void telephonySetCellInfoListRate(
                @RpcParameter(name = "rate") Integer rate
            ) {
        mTelephonyManager.setCellInfoListRate(rate);
    }

    /**
     * Request a list of the current (latest) CellInfo.
     *
     * <p>When invoked on a device running Q or later, this will only return cached info.
     */
    @Rpc(description = "Returns all observed cell information from all radios"
                       + "on the device including the primary and neighboring cells.")
    public List<CellInfo> telephonyGetAllCellInfo() {
        return mTelephonyManager.getAllCellInfo();
    }

    private abstract class FacadeCellInfoCallback extends TelephonyManager.CellInfoCallback {
        public List<CellInfo> cellInfo;
    }

    /** Request an asynchronous update for the latest CellInfo */
    @Rpc(description = "Request updated CellInfo scan information for"
                       + " primary and neighboring cells.")
    public List<CellInfo> telephonyRequestCellInfoUpdate() {
        FacadeCellInfoCallback tmCiCb = new FacadeCellInfoCallback() {
            @Override
            public void onCellInfo(List<CellInfo> ci) {
                synchronized (this) {
                    this.cellInfo = ci;
                    notifyAll();
                }
            }

            @Override
            public void onError(int errorCode, Throwable detail) {
                Log.d("Error in telephonyRequestCellInfoUpdate(): errorCode=" + errorCode
                        + "detail=" + detail);
            }
        };

        synchronized (tmCiCb) {
            mTelephonyManager.requestCellInfoUpdate(
                    new Executor() {
                        public void execute(Runnable r) {
                            Log.d("Running cellInfo Executor");
                            r.run();
                        }
                    }, tmCiCb);
            try {
                tmCiCb.wait(3000 /* millis */);
            } catch (InterruptedException e) {
                Log.d("Timed out waiting for cellInfo Executor");
                return null;
            }
        }
        return tmCiCb.cellInfo;
    }

    @Rpc(description = "Returns True if cellular data is enabled for" +
                       "default data subscription ID.")
    public Boolean telephonyIsDataEnabled() {
        return telephonyIsDataEnabledForSubscription(
                   SubscriptionManager.getDefaultDataSubscriptionId());
    }

    @Rpc(description = "Returns True if data connection is enabled.")
    public Boolean telephonyIsDataEnabledForSubscription(
                   @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getDataEnabled(subId);
    }

    @Rpc(description = "Toggles data connection on /off for" +
                       " default data subscription ID.")
    public void telephonyToggleDataConnection(
                @RpcParameter(name = "enabled")
                @RpcOptional Boolean enabled) {
        telephonyToggleDataConnectionForSubscription(
                         SubscriptionManager.getDefaultDataSubscriptionId(), enabled);
    }

    @Rpc(description = "Toggles data connection on/off for" +
                       " specified subscription ID")
    public void telephonyToggleDataConnectionForSubscription(
                @RpcParameter(name = "subId") Integer subId,
                @RpcParameter(name = "enabled")
                @RpcOptional Boolean enabled) {
        if (enabled == null) {
            enabled = !telephonyIsDataEnabledForSubscription(subId);
        }
        mTelephonyManager.setDataEnabled(subId, enabled);
    }

    @Rpc(description = "Sets an APN and make that as preferred APN.")
    public void telephonySetAPN(@RpcParameter(name = "name") final String name,
                       @RpcParameter(name = "apn") final String apn,
                       @RpcParameter(name = "type") @RpcOptional @RpcDefault("")
                       final String type,
                       @RpcParameter(name = "subId") @RpcOptional Integer subId) {
        //TODO: b/26273471 Need to find out how to set APN for specific subId
        Uri uri;
        Cursor cursor;

        String mcc = "";
        String mnc = "";

        List<String> numerics = TelephonyProperties.icc_operator_numeric();
        String numeric = numerics.isEmpty() ? null : numerics.get(0);
        // MCC is first 3 chars and then in 2 - 3 chars of MNC
        if (numeric != null && numeric.length() > 4) {
            // Country code
            mcc = numeric.substring(0, 3);
            // Network code
            mnc = numeric.substring(3);
        }

        uri = mService.getContentResolver().insert(
                Telephony.Carriers.CONTENT_URI, new ContentValues());
        if (uri == null) {
            Log.w("Failed to insert new provider into " + Telephony.Carriers.CONTENT_URI);
            return;
        }

        cursor = mService.getContentResolver().query(uri, sProjection, null, null, null);
        cursor.moveToFirst();

        ContentValues values = new ContentValues();

        values.put(Telephony.Carriers.NAME, name);
        values.put(Telephony.Carriers.APN, apn);
        values.put(Telephony.Carriers.PROXY, "");
        values.put(Telephony.Carriers.PORT, "");
        values.put(Telephony.Carriers.MMSPROXY, "");
        values.put(Telephony.Carriers.MMSPORT, "");
        values.put(Telephony.Carriers.USER, "");
        values.put(Telephony.Carriers.SERVER, "");
        values.put(Telephony.Carriers.PASSWORD, "");
        values.put(Telephony.Carriers.MMSC, "");
        values.put(Telephony.Carriers.TYPE, type);
        values.put(Telephony.Carriers.MCC, mcc);
        values.put(Telephony.Carriers.MNC, mnc);
        values.put(Telephony.Carriers.NUMERIC, mcc + mnc);

        int ret = mService.getContentResolver().update(uri, values, null, null);
        Log.d("after update " + ret);
        cursor.close();

        // Make this APN as the preferred
        String where = "name=\"" + name + "\"";

        Cursor c = mService.getContentResolver().query(
                Telephony.Carriers.CONTENT_URI,
                new String[] {
                        "_id", "name", "apn", "type"
                }, where, null,
                Telephony.Carriers.DEFAULT_SORT_ORDER);
        if (c != null) {
            c.moveToFirst();
            String key = c.getString(0);
            final String PREFERRED_APN_URI = "content://telephony/carriers/preferapn";
            ContentResolver resolver = mService.getContentResolver();
            ContentValues prefAPN = new ContentValues();
            prefAPN.put("apn_id", key);
            resolver.update(Uri.parse(PREFERRED_APN_URI), prefAPN, null, null);
        }
        c.close();
    }

    @Rpc(description = "Returns the number of APNs defined")
    public int telephonyGetNumberOfAPNs(
               @RpcParameter(name = "subId")
               @RpcOptional Integer subId) {
        //TODO: b/26273471 Need to find out how to get Number of APNs for specific subId
        int result = 0;

        Cursor cursor = mService.getContentResolver().query(
                Telephony.Carriers.SIM_APN_URI,
                new String[] {"_id", "name", "apn", "type"}, null, null,
                Telephony.Carriers.DEFAULT_SORT_ORDER);

        if (cursor != null) {
            result = cursor.getCount();
        }
        cursor.close();
        return result;
    }

    @Rpc(description = "Returns the currently selected APN name")
    public String telephonyGetSelectedAPN(
                  @RpcParameter(name = "subId")
                  @RpcOptional Integer subId) {
        //TODO: b/26273471 Need to find out how to get selected APN for specific subId
        String key = null;
        int ID_INDEX = 0;
        final String PREFERRED_APN_URI = "content://telephony/carriers/preferapn";

        Cursor cursor = mService.getContentResolver().query(Uri.parse(PREFERRED_APN_URI),
                new String[] {"name"}, null, null, Telephony.Carriers.DEFAULT_SORT_ORDER);

        if (cursor.getCount() > 0) {
            cursor.moveToFirst();
            key = cursor.getString(ID_INDEX);
        }
        cursor.close();
        return key;
    }

    @Rpc(description = "Returns the current data connection state")
    public String telephonyGetDataConnectionState() {
        return TelephonyUtils.getDataConnectionStateString(
            mTelephonyManager.getDataState());
    }

    @Rpc(description = "Returns Total Rx Bytes.")
    public long getTotalRxBytes() {
        return TrafficStats.getTotalRxBytes();
    }

    @Rpc(description = "Returns Total Tx Bytes.")
    public long getTotalTxBytes() {
        return TrafficStats.getTotalTxBytes();
    }

    @Rpc(description = "Returns Total Rx Packets.")
    public long getTotalRxPackets() {
        return TrafficStats.getTotalRxPackets();
    }

    @Rpc(description = "Returns Total Tx Packets.")
    public long getTotalTxPackets() {
        return TrafficStats.getTotalTxPackets();
    }

    @Rpc(description = "Returns Mobile Network Rx Bytes.")
    public long getMobileRxBytes() {
        return TrafficStats.getMobileRxBytes();
    }

    @Rpc(description = "Returns Mobile Network Tx Bytes.")
    public long getMobileTxBytes() {
        return TrafficStats.getMobileTxBytes();
    }

    @Rpc(description = "Returns Mobile Network Packets.")
    public long getMobileRxPackets() {
        return TrafficStats.getMobileRxPackets();
    }

    @Rpc(description = "Returns Mobile Network Packets.")
    public long getMobileTxPackets() {
        return TrafficStats.getMobileTxPackets();
    }

    @Rpc(description = "Returns a given UID Rx Bytes.")
    public long getUidRxBytes(
            @RpcParameter(name = "uid") Integer uid) {
        return TrafficStats.getUidRxBytes(uid);
    }

    @Rpc(description = "Returns a given UID Rx Packets.")
    public long getUidRxPackets(
            @RpcParameter(name = "uid") Integer uid) {
        return TrafficStats.getUidRxPackets(uid);
    }

    @Rpc(description = "Enables or Disables Video Calling()")
    public void telephonyEnableVideoCalling(
            @RpcParameter(name = "enable") boolean enable) {
        mTelephonyManager.enableVideoCalling(enable);
    }

    @Rpc(description = "Returns a boolean of whether or not " +
            "video calling setting is enabled by the user")
    public Boolean telephonyIsVideoCallingEnabled() {
        return mTelephonyManager.isVideoCallingEnabled();
    }

    @Rpc(description = "Returns a boolean of whether video calling is available for use")
    public Boolean telephonyIsVideoCallingAvailable() {
        return mTelephonyManager.isVideoTelephonyAvailable();
    }

    @Rpc(description = "Returns a boolean of whether or not the device is ims registered")
    public Boolean telephonyIsImsRegistered() {
        return mTelephonyManager.isImsRegistered();
    }

    @Rpc(description = "Returns a boolean of whether or not volte calling is available for use")
    public Boolean telephonyIsVolteAvailable() {
        return mTelephonyManager.isVolteAvailable();
    }

    @Rpc(description = "Returns a boolean of whether or not wifi calling is available for use")
    public Boolean telephonyIsWifiCallingAvailable() {
        return mTelephonyManager.isWifiCallingAvailable();
    }

    @Rpc(description = "Returns the service state string for default subscription ID")
    public ServiceState telephonyGetServiceState() {
        return telephonyGetServiceStateForSubscription(
                                 SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Returns the service state string for specified subscription ID")
    public ServiceState telephonyGetServiceStateForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return mTelephonyManager.getServiceStateForSubscriber(subId);
    }

    @Rpc(description = "Returns the call state for default subscription ID")
    public String telephonyGetCallState() {
        return telephonyGetCallStateForSubscription(
                               SubscriptionManager.getDefaultSubscriptionId());
    }

    @Rpc(description = "Returns the call state for specified subscription ID")
    public String telephonyGetCallStateForSubscription(
                  @RpcParameter(name = "subId") Integer subId) {
        return TelephonyUtils.getTelephonyCallStateString(
            mTelephonyManager.getCallState(subId));
    }

    @Rpc(description = "Returns current signal strength for default subscription ID.")
    public SignalStrength telephonyGetSignalStrength() {
        return mTelephonyManager.getSignalStrength();
    }

    @Rpc(description = "Returns current signal strength for specified subscription ID.")
    public SignalStrength telephonyGetSignalStrengthForSubscription(
                    @RpcParameter(name = "subId") Integer subId) {
        StateChangeListener listener = getStateChangeListenerForSubscription(subId, false);
        if(listener == null) {
            Log.e("Invalid subscription ID");
            return null;
        }
        return listener.mSignalStrengthChangeListener.mSignalStrengths;
    }

    @Rpc(description = "Returns the sim count.")
    public int telephonyGetSimCount() {
        return mTelephonyManager.getSimCount();
    }

    /**
     * Get the list of Forbidden PLMNs stored on the USIM
     * profile of the SIM for the default subscription.
     */
    @Rpc(description = "Returns a list of forbidden PLMNs")
    public @Nullable List<String> telephonyGetForbiddenPlmns() {
        String[] fplmns = mTelephonyManager.getForbiddenPlmns(
                SubscriptionManager.getDefaultSubscriptionId(),
                TelephonyManager.APPTYPE_USIM);

        if (fplmns != null) {
            return Arrays.asList(fplmns);
        }
        return null;
    }

    private StateChangeListener getStateChangeListenerForSubscription(
            int subId,
            boolean createIfNeeded) {

       if(mStateChangeListeners.get(subId) == null) {
            if(createIfNeeded == false) {
                return null;
            }

            if(mSubscriptionManager.isValidSubscriptionId(subId) == false) {
                Log.e("Cannot get listener for invalid/inactive subId");
                return null;
            }

            mStateChangeListeners.put(subId, new StateChangeListener(subId));
        }

        return mStateChangeListeners.get(subId);
    }

    //FIXME: This whole class needs reworking. Why do we have separate listeners for everything?
    //We need one listener that overrides multiple methods.
    private final class StateChangeListener {
        public ServiceStateChangeListener mServiceStateChangeListener;
        public SignalStrengthChangeListener mSignalStrengthChangeListener;
        public CallStateChangeListener mCallStateChangeListener;
        public CellInfoChangeListener mCellInfoChangeListener;
        public DataConnectionStateChangeListener mDataConnectionStateChangeListener;
        public ActiveDataSubIdChangeListener mActiveDataSubIdChangeListener;
        public DisplayInfoStateChangeListener mDisplayInfoStateChangeListener;
        public DataConnectionRealTimeInfoChangeListener mDataConnectionRTInfoChangeListener;
        public VoiceMailStateChangeListener mVoiceMailStateChangeListener;

        public StateChangeListener(int subId) {
            mServiceStateChangeListener =
                new ServiceStateChangeListener(mEventFacade, subId, mService.getMainLooper());
            mSignalStrengthChangeListener =
                new SignalStrengthChangeListener(mEventFacade, subId, mService.getMainLooper());
            mDataConnectionStateChangeListener =
                new DataConnectionStateChangeListener(
                        mEventFacade, mTelephonyManager, subId, mService.getMainLooper());
            mActiveDataSubIdChangeListener =
                new ActiveDataSubIdChangeListener(
                        mEventFacade, mTelephonyManager, subId, mService.getMainLooper());
            mDisplayInfoStateChangeListener =
                new DisplayInfoStateChangeListener(
                        mEventFacade, mTelephonyManager, subId, mService.getMainLooper());
            mCallStateChangeListener =
                new CallStateChangeListener(mEventFacade, subId, mService.getMainLooper());
            mCellInfoChangeListener =
                new CellInfoChangeListener(mEventFacade, subId, mService.getMainLooper());
            mDataConnectionRTInfoChangeListener =
                new DataConnectionRealTimeInfoChangeListener(
                        mEventFacade, subId, mService.getMainLooper());
            mVoiceMailStateChangeListener =
                new VoiceMailStateChangeListener(mEventFacade, subId, mService.getMainLooper());
        }

        public void shutdown() {
            mTelephonyManager.listen(
                    mServiceStateChangeListener,
                    PhoneStateListener.LISTEN_NONE);
            mTelephonyManager.listen(
                    mSignalStrengthChangeListener,
                    PhoneStateListener.LISTEN_NONE);
            mTelephonyManager.listen(
                    mCallStateChangeListener,
                    PhoneStateListener.LISTEN_NONE);
            mTelephonyManager.listen(
                    mActiveDataSubIdChangeListener,
                    PhoneStateListener.LISTEN_NONE);
            mTelephonyManager.listen(
                    mDisplayInfoStateChangeListener,
                    PhoneStateListener.LISTEN_NONE);
            mTelephonyManager.listen(
                    mCellInfoChangeListener,
                    PhoneStateListener.LISTEN_NONE);
            mTelephonyManager.listen(
                    mDataConnectionStateChangeListener,
                    PhoneStateListener.LISTEN_NONE);
            mTelephonyManager.listen(
                    mDataConnectionRTInfoChangeListener,
                    PhoneStateListener.LISTEN_NONE);
            mTelephonyManager.listen(
                    mVoiceMailStateChangeListener,
                    PhoneStateListener.LISTEN_NONE);
        }

        protected void finalize() {
            try {
                shutdown();
            } catch(Exception e) {}
        }
    }

    @Override
    public void shutdown() {
        for(StateChangeListener listener : mStateChangeListeners.values()) {
            listener.shutdown();
        }
    }
}