在android上监听网络状态的变更

<receiver

android:name="NetworkReceiver">

<intent-filter>

<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />

</intent-filter>
</receiver>

public class NetworkReceiver extends BroadcastReceiver {

protected Context    mContext;

@Override

public void onReceive(Context context, Intent intent) {

mContext = context;

// 第一种

ConnectivityManager connectivityManager = (ConnectivityManager) context

.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();

NetworkInfo mobileNetInfo = connectivityManager

.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

showToast("Active Network Type", activeNetInfo);

showToast("Mobile Network Type", mobileNetInfo);

// 第二种

NetworkInfo networkInfo = intent

.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);

String extraInfo = intent

.getStringExtra(ConnectivityManager.EXTRA_EXTRA_INFO);

boolean isFailOver = intent.getBooleanExtra(

ConnectivityManager.EXTRA_IS_FAILOVER, false);

boolean noConnectivity = intent.getBooleanExtra(

ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);

NetworkInfo otherNetworkInfo = intent

.getParcelableExtra(ConnectivityManager.EXTRA_OTHER_NETWORK_INFO);

String reason = intent.getStringExtra(ConnectivityManager.EXTRA_REASON);

//

showToast("networkInfo", networkInfo);

showToast("extraInfo", extraInfo);

showToast("isFailOver", isFailOver);

showToast("noConnectivity", noConnectivity);

showToast("otherNetworkInfo", otherNetworkInfo);

showToast("reason", reason);

}

public void showToast(String info, Object object) {

if (object == null) {

return;

}

Toast.makeText(mContext, info + " : " + object.toString(), 0).show();

}
}