1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.services.telephony; 18 19 import android.content.Context; 20 import android.content.Intent; 21 import android.os.UserHandle; 22 import android.provider.Settings; 23 import android.telephony.TelephonyManager; 24 25 import com.android.internal.telephony.Phone; 26 import com.android.internal.telephony.PhoneFactory; 27 28 import java.util.ArrayList; 29 import java.util.HashSet; 30 import java.util.List; 31 32 /** 33 * Helper class that implements special behavior related to emergency calls. Specifically, this 34 * class handles the case of the user trying to dial an emergency number while the radio is off 35 * (i.e. the device is in airplane mode), by forcibly turning the radio back on, waiting for it to 36 * come up, and then retrying the emergency call. 37 */ 38 public class EmergencyCallHelper implements EmergencyCallStateListener.Callback { 39 40 private final Context mContext; 41 private EmergencyCallStateListener.Callback mCallback; 42 private List<EmergencyCallStateListener> mListeners; 43 private List<EmergencyCallStateListener> mInProgressListeners; 44 private boolean mIsEmergencyCallingEnabled; 45 46 EmergencyCallHelper(Context context)47 public EmergencyCallHelper(Context context) { 48 mContext = context; 49 mInProgressListeners = new ArrayList<>(2); 50 } 51 setupListeners()52 private void setupListeners() { 53 if (mListeners != null) { 54 return; 55 } 56 mListeners = new ArrayList<>(2); 57 for (int i = 0; i < TelephonyManager.getDefault().getPhoneCount(); i++) { 58 mListeners.add(new EmergencyCallStateListener()); 59 } 60 } 61 /** 62 * Starts the "turn on radio" sequence. This is the (single) external API of the 63 * EmergencyCallHelper class. 64 * 65 * This method kicks off the following sequence: 66 * - Power on the radio for each Phone 67 * - Listen for the service state change event telling us the radio has come up. 68 * - Retry if we've gone a significant amount of time without any response from the radio. 69 * - Finally, clean up any leftover state. 70 * 71 * This method is safe to call from any thread, since it simply posts a message to the 72 * EmergencyCallHelper's handler (thus ensuring that the rest of the sequence is entirely 73 * serialized, and runs on the main looper.) 74 */ enableEmergencyCalling(EmergencyCallStateListener.Callback callback)75 public void enableEmergencyCalling(EmergencyCallStateListener.Callback callback) { 76 setupListeners(); 77 mCallback = callback; 78 mInProgressListeners.clear(); 79 mIsEmergencyCallingEnabled = false; 80 for (int i = 0; i < TelephonyManager.getDefault().getPhoneCount(); i++) { 81 Phone phone = PhoneFactory.getPhone(i); 82 if (phone == null) 83 continue; 84 85 mInProgressListeners.add(mListeners.get(i)); 86 mListeners.get(i).waitForRadioOn(phone, this); 87 } 88 89 powerOnRadio(); 90 } 91 /** 92 * Attempt to power on the radio (i.e. take the device out of airplane mode). We'll eventually 93 * get an onServiceStateChanged() callback when the radio successfully comes up. 94 */ powerOnRadio()95 private void powerOnRadio() { 96 Log.d(this, "powerOnRadio()."); 97 98 // If airplane mode is on, we turn it off the same way that the Settings activity turns it 99 // off. 100 if (Settings.Global.getInt(mContext.getContentResolver(), 101 Settings.Global.AIRPLANE_MODE_ON, 0) > 0) { 102 Log.d(this, "==> Turning off airplane mode."); 103 104 // Change the system setting 105 Settings.Global.putInt(mContext.getContentResolver(), 106 Settings.Global.AIRPLANE_MODE_ON, 0); 107 108 // Post the broadcast intend for change in airplane mode 109 // TODO: We really should not be in charge of sending this broadcast. 110 // If changing the setting is sufficent to trigger all of the rest of the logic, 111 // then that should also trigger the broadcast intent. 112 Intent intent = new Intent(Intent.ACTION_AIRPLANE_MODE_CHANGED); 113 intent.putExtra("state", false); 114 mContext.sendBroadcastAsUser(intent, UserHandle.ALL); 115 } 116 } 117 118 /** 119 * This method is called from multiple Listeners on the Main Looper. 120 * Synchronization is not necessary. 121 */ 122 @Override onComplete(EmergencyCallStateListener listener, boolean isRadioReady)123 public void onComplete(EmergencyCallStateListener listener, boolean isRadioReady) { 124 mIsEmergencyCallingEnabled |= isRadioReady; 125 mInProgressListeners.remove(listener); 126 if (mCallback != null && mInProgressListeners.isEmpty()) { 127 mCallback.onComplete(null, mIsEmergencyCallingEnabled); 128 } 129 } 130 } 131