监听手机网络状态变化

private BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
connectivityManager = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
info = connectivityManager.getActiveNetworkInfo();
if (info != null && info.isAvailable()) {
//网络可用时，执行的代码

return;
}

//网络不可用时，执行的代码
}
}
};

IntentFilter mFilter = new IntentFilter();
mFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(mReceiver, mFilter);

<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />