如何在while循环中使用处理函数并等待事件？

Question

我正在尝试使用处理程序来等待我的无线连接。这一段代码我使用：

final AlertDialog alertDialog2 = new AlertDialog.Builder(new android.view.ContextThemeWrapper(context, R.style.AlertDialogCustom)).create(); 
    alertDialog2.setTitle("Loading..."); 
    alertDialog2.setIcon(R.drawable.check); 
    alertDialog2.show(); 
    Handler handler = new Handler(); 
    int count = 0; 
    while (!isConnected() /*Check wifi connection*/) { 
     handler.postDelayed(new Runnable() { 
      @Override 
      public void run() { 
       alertDialog2.dismiss(); 
       // do other thing 
      } 
     }, 200); 
     count++; 
     /*stop the loop after 20s*/ 
     if (count > 100) { 
      break; 
     } 
    } 

正如你可以在一段代码中看到的，我想显示在操作过程中加载alertDialog和它结束时，我想阻止它通知用户为他的wifi连接。

Answer 1

您将需要使用WIFI广播接收器。

首先，您需要显示对话框，然后注册wifi广播接收器，告诉您WIFI状态何时发生变化以及何时收到您想要关闭对话的状态。

是指在以下链接了解如何检测WIFI状态更改

How to detect when WIFI Connection has been established in Android?

final AlertDialog alertDialog2 = new AlertDialog.Builder(new android.view.ContextThemeWrapper(context, R.style.AlertDialogCustom)).create(); 
alertDialog2.setTitle("Loading..."); 
alertDialog2.setIcon(R.drawable.check); 
alertDialog2.show(); 

private final BroadcastReceiver myReceiver = new BroadcastReceiver() { 

@Override 
    public void onReceive(Context context, Intent intent) { 
     if(intent.getAction().equalsIgnoreCase("android.net.wifi.STATE_CHANGE")) { 
      Log.d(TAG,"WIFI STATE CHANGED"); 
alertDialog2. dismiss(); 
     } 
    } 
}; 

IntentFilter intent = new IntentFilter(""); 
registerReceiver(myReceiver, intent);