1 /* 2 * Copyright (C) 2021 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.car.settings.qc; 18 19 import android.content.Context; 20 import android.database.ContentObserver; 21 import android.net.Uri; 22 import android.os.Handler; 23 import android.os.Looper; 24 import android.provider.Settings; 25 import android.telephony.SignalStrength; 26 import android.telephony.SubscriptionManager; 27 import android.telephony.TelephonyCallback; 28 import android.telephony.TelephonyManager; 29 30 import java.io.IOException; 31 32 /** 33 * Base background worker for mobile data QCItems. 34 * @param <E> The {@link SettingsQCItem} the background worker is associated with. 35 */ 36 public abstract class MobileDataBaseWorker<E extends SettingsQCItem> 37 extends SettingsQCBackgroundWorker<E> { 38 39 private final TelephonyManager mTelephonyManager; 40 private final int mSubId; 41 private final SignalStrengthsListener mSignalStrengthsListener; 42 private boolean mCallbacksRegistered; 43 44 private final ContentObserver mMobileDataChangeObserver = new ContentObserver( 45 new Handler(Looper.getMainLooper())) { 46 @Override 47 public void onChange(boolean selfChange) { 48 super.onChange(selfChange); 49 notifyQCItemChange(); 50 } 51 }; 52 MobileDataBaseWorker(Context context, Uri uri)53 protected MobileDataBaseWorker(Context context, Uri uri) { 54 super(context, uri); 55 mTelephonyManager = context.getSystemService(TelephonyManager.class); 56 mSubId = SubscriptionManager.getDefaultDataSubscriptionId(); 57 mSignalStrengthsListener = new SignalStrengthsListener(); 58 } 59 60 @Override onQCItemSubscribe()61 protected void onQCItemSubscribe() { 62 if (mSubId != SubscriptionManager.INVALID_SUBSCRIPTION_ID && !mCallbacksRegistered) { 63 mTelephonyManager.registerTelephonyCallback(getContext().getMainExecutor(), 64 mSignalStrengthsListener); 65 getContext().getContentResolver().registerContentObserver(getObservableUri(mSubId), 66 /* notifyForDescendants= */ false, mMobileDataChangeObserver); 67 mCallbacksRegistered = true; 68 } 69 } 70 71 @Override onQCItemUnsubscribe()72 protected void onQCItemUnsubscribe() { 73 if (mSubId != SubscriptionManager.INVALID_SUBSCRIPTION_ID) { 74 unregisterCallbacks(); 75 } 76 } 77 78 @Override close()79 public void close() throws IOException { 80 if (mSubId != SubscriptionManager.INVALID_SUBSCRIPTION_ID) { 81 unregisterCallbacks(); 82 } 83 } 84 unregisterCallbacks()85 private void unregisterCallbacks() { 86 if (mCallbacksRegistered) { 87 mTelephonyManager.unregisterTelephonyCallback(mSignalStrengthsListener); 88 getContext().getContentResolver().unregisterContentObserver(mMobileDataChangeObserver); 89 mCallbacksRegistered = false; 90 } 91 } 92 getObservableUri(int subId)93 private Uri getObservableUri(int subId) { 94 Uri uri = Settings.Global.getUriFor(Settings.Global.MOBILE_DATA); 95 if (TelephonyManager.from(getContext()).getSimCount() != 1) { 96 uri = Settings.Global.getUriFor(Settings.Global.MOBILE_DATA + subId); 97 } 98 return uri; 99 } 100 101 private class SignalStrengthsListener extends TelephonyCallback 102 implements TelephonyCallback.SignalStrengthsListener { 103 104 @Override onSignalStrengthsChanged(SignalStrength signalStrength)105 public void onSignalStrengthsChanged(SignalStrength signalStrength) { 106 notifyQCItemChange(); 107 } 108 } 109 } 110