Broadcast Receiver监听网络状态

在代码中动态注册，不需要在AndroidManifest.xml里静态注册，静态注册在不打开App的情况下，有可以接收到广播。

public class MainActivity extends Activity {private IntentFilter intentFilter;private NetworkChangeReceiver networkChangeReceiver;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    intentFilter = new IntentFilter();    intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");//监听网络的状态；网络状态改变就会被调动。    networkChangeReceiver = new NetworkChangeReceiver();    registerReceiver(networkChangeReceiver, intentFilter);}@Overrideprotected void onDestroy() {    super.onDestroy();    unregisterReceiver(networkChangeReceiver);    }}

创建NetworkChangeReceiver类继承BroadcaseReceiver

class NetworkChangeReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {//枚举 enum NetworkStatus {DisConnect,Mobile,Wifi}    ConfigConstant.NetworkStatus status    =getConnectType();    switch(status){        case DisConnect:        break;        case Mobile:        break;        case Wifi:        break;    }}/**获取网络状态，*/private ConfigConstant.NetworkStatus getConnectType() {    ConnectivityManager connMgr =(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);    NetworkInfo activeInfo = connMgr.getActiveNetworkInfo();    if (activeInfo != null && activeInfo.isConnected()){        if (activeInfo.getType() == ConnectivityManager.TYPE_WIFI)            return ConfigConstant.NetworkStatus.Wifi;        else if (activeInfo.getType() == ConnectivityManager.TYPE_MOBILE)            return ConfigConstant.NetworkStatus.Mobile;    }    return ConfigConstant.NetworkStatus.DisConnect;}

网络状态一旦发生改变，会调用NetworkChangeReceiver 的onReceive（），再去获取网络状态。