【总结备用】Android监听网络状态实现(BroadcastReceiver + Service)
16lz
2022-04-11
Android网络应用程序开发中,经常要判断网络连接是否可用,因此经常有必要监听网络状态的变化。
Android的网络状态监听可以用BroadcastReceiver来接收网络状态改变的广播,具体实现如下:
/** * ConnectionChangeReceiver * * @author benny Yang on 2011-12-23 * */public class ConnectionChangeReceiver extends BroadcastReceiver { private static final String TAG =ConnectionChangeReceiver.class.getSimpleName(); @Override public void onReceive(Context context, Intent intent) { Log.e(TAG, "网络状态改变"); boolean success = false; //获得网络连接服务 ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); // State state = connManager.getActiveNetworkInfo().getState(); // 获取WIFI网络连接状态 State state = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState(); // 判断是否正在使用WIFI网络 if (State.CONNECTED == state) { success = true; } // 获取GPRS网络连接状态 state = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState(); // 判断是否正在使用GPRS网络 if (State.CONNECTED == state){ success = true; } if (!success) { Toast.makeText(context, context.getString(R.string.your_network_has_disconnected), Toast.LENGTH_LONG).show(); } }
记得在Manifest文件里面进行权限声明,和广播接收器注册。
- <!--Neededtocheckwhenthenetworkconnectionchanges-->
- <uses-permissionandroid:name="android.permission.ACCESS_NETWORK_STATE"/>
- <receiverandroid:name="you_package_name.ConnectionChangeReceiver" android:label="NetworkConnection">
- <intent-filter>
- <actionandroid:name="android.net.conn.CONNECTIVITY_CHANGE"/>
- </intent-filter>
- </receiver>
使用方式一:
1. 在Activity的onCreate中:
//注册网络监听
IntentFilter filter = new IntentFilter();
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(mNetworkStateReceiver, filter);
2. 在Activity中的onDestroy中:
//取消监听
unregisterReceiver(mNetworkStateReceiver);
使用方式二:
1. 应用启动时,启动Service,在Service的onCreate方法中注册网络监听:
//注册网络监听
IntentFilter filter = new IntentFilter();
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(mNetworkStateReceiver, filter);
2. 应用退出时,Service关闭,在Service的onDestroy方法中取消监听:
//取消监听
unregisterReceiver(mNetworkStateReceiver);
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