1 /* 2 * Copyright (C) 2017 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 package com.android.wallpaper.module; 17 18 import android.content.BroadcastReceiver; 19 import android.content.Context; 20 import android.content.Intent; 21 import android.content.IntentFilter; 22 import android.net.ConnectivityManager; 23 import android.net.NetworkInfo; 24 25 import dagger.hilt.android.qualifiers.ApplicationContext; 26 27 import java.util.ArrayList; 28 import java.util.List; 29 30 import javax.inject.Inject; 31 import javax.inject.Singleton; 32 33 /** 34 * Implementation of {@link NetworkStatusNotifier} which uses 35 * {@link android.net.ConnectivityManager} to provide network status. 36 */ 37 @Singleton 38 public class DefaultNetworkStatusNotifier implements NetworkStatusNotifier { 39 40 private Context mAppContext; 41 private ConnectivityManager mConnectivityManager; 42 private BroadcastReceiver mReceiver; 43 private List<Listener> mListeners; 44 45 @Inject DefaultNetworkStatusNotifier(@pplicationContext Context context)46 public DefaultNetworkStatusNotifier(@ApplicationContext Context context) { 47 mAppContext = context; 48 49 mConnectivityManager = 50 (ConnectivityManager) mAppContext.getSystemService(Context.CONNECTIVITY_SERVICE); 51 mListeners = new ArrayList<>(); 52 } 53 54 @Override 55 @NetworkStatus getNetworkStatus()56 public int getNetworkStatus() { 57 NetworkInfo activeNetwork = mConnectivityManager.getActiveNetworkInfo(); 58 59 if (activeNetwork != null && activeNetwork.isConnected()) { 60 return NETWORK_CONNECTED; 61 } 62 return NETWORK_NOT_CONNECTED; 63 } 64 65 @Override registerListener(Listener listener)66 public void registerListener(Listener listener) { 67 if (mReceiver == null) { 68 mReceiver = new BroadcastReceiver() { 69 @Override 70 public void onReceive(Context context, Intent intent) { 71 @NetworkStatus int networkStatus = getNetworkStatus(); 72 for (int i = 0; i < mListeners.size(); i++) { 73 mListeners.get(i).onNetworkChanged(networkStatus); 74 } 75 } 76 }; 77 IntentFilter intentFilter = new IntentFilter(); 78 intentFilter.addAction(android.net.ConnectivityManager.CONNECTIVITY_ACTION); 79 80 if (!mListeners.contains(listener)) { 81 mListeners.add(listener); 82 } 83 // Upon an initial register, the broadcast is immediately sent. 84 mAppContext.registerReceiver(mReceiver, intentFilter); 85 return; 86 } 87 88 if (!mListeners.contains(listener)) { 89 mListeners.add(listener); 90 } 91 } 92 93 @Override unregisterListener(Listener listener)94 public void unregisterListener(Listener listener) { 95 mListeners.remove(listener); 96 97 if (!mListeners.isEmpty() || mReceiver == null) { 98 return; 99 } 100 101 mAppContext.unregisterReceiver(mReceiver); 102 mReceiver = null; 103 } 104 } 105