java - 每次 wifi 断开时通知

Question

我需要我的应用程序在 WiFi 离线时发出通知。

我让它在每次 WiFi 连接发生变化时发出通知。但我需要它只在离线时发出通知。

它还会在(应用程序的)启动时发出通知。

我的问题是，如何更改代码以仅在 WiFi 离线时发出通知？现在它会在离线、在线和启动时发出通知。

代码:

     public class MainActivity extends Activity { 
     @Override
     protected void onCreate(Bundle savedInstanceState) {        

     super.onCreate(savedInstanceState);  
     this.registerReceiver(this.mConnReceiver,
        new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
     setContentView(R.layout.activity_main);
     }

     private BroadcastReceiver mConnReceiver = new BroadcastReceiver() {
     public void onReceive(Context context, Intent intent) {
     boolean noConnectivity = intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);
     String reason = intent.getStringExtra(ConnectivityManager.EXTRA_REASON);
     boolean isFailover = intent.getBooleanExtra(ConnectivityManager.EXTRA_IS_FAILOVER, false);

     NetworkInfo currentNetworkInfo = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
     NetworkInfo otherNetworkInfo = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager.EXTRA_OTHER_NETWORK_INFO);

     if(currentNetworkInfo.isConnected()){

     }else{
        showNotification();
     }
 }
};

Answer 1

像这样尝试:

if(currentNetworkInfo != null &&
     currentNetworkInfo.getType() == ConnectivityManager.TYPE_WIFI &&
     currentNetworkInfo.getState() == NetworkInfo.State.DISCONNECTING) {
    showNotification();
}

还有其他可能的状态(例如 NetworkInfo.State.DISCONNECTED，也许这就是您想要的)，您可以在此处找到完整列表: http://developer.android.com/reference/android/net/NetworkInfo.State.html