onBackPressed（）显示错误

问题描述：

我想在mainactivity上单击后退按钮时添加退出警告。为此，我正在使用此代码onBackPressed（）显示错误

@Override 
public void onBackPressed() { 
    // TODO Auto-generated method stub 

    final Dialog dialoge=new Dialog(MainActivity.this,android.R.style.Theme_Translucent_NoTitleBar); 
    dialoge.setContentView(R.layout.popup_layout); 

    Button yes=(Button)dialoge.findViewById(R.id.yes); 
    yes.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 

      MainActivity.this.finish(); 

     } 
    }); 
    Button no=(Button)dialoge.findViewById(R.id.no); 
    no.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      dialoge.cancel(); 
     } 
    }); 


    dialoge.show(); 
}

这是行得通的，但在退出时显示一些错误。

的logcat的是

03-21 10:25:57.192: E/WindowManager(14488): Activity com.example.design.MainActivity has leaked window [email protected] that was originally added here 
03-21 10:25:57.192: E/WindowManager(14488): android.view.WindowLeaked: Activity com.example.design.MainActivity has leaked window [email protected] that was originally added here 
03-21 10:25:57.192: E/WindowManager(14488):  at android.view.ViewRoot.<init>(ViewRoot.java:251) 
03-21 10:25:57.192: E/WindowManager(14488):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148) 
03-21 10:25:57.192: E/WindowManager(14488):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) 
03-21 10:25:57.192: E/WindowManager(14488):  at android.view.Window$LocalWindowManager.addView(Window.java:424) 
03-21 10:25:57.192: E/WindowManager(14488):  at android.app.Dialog.show(Dialog.java:241) 
03-21 10:25:57.192: E/WindowManager(14488):  at com.example.design.MainActivity.onBackPressed(MainActivity.java:97) 
03-21 10:25:57.192: E/WindowManager(14488):  at android.app.Activity.onKeyUp(Activity.java:1895) 
03-21 10:25:57.192: E/WindowManager(14488):  at android.view.KeyEvent.dispatch(KeyEvent.java:1283) 
03-21 10:25:57.192: E/WindowManager(14488):  at android.app.Activity.dispatchKeyEvent(Activity.java:2075) 
03-21 10:25:57.192: E/WindowManager(14488):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1673) 
03-21 10:25:57.192: E/WindowManager(14488):  at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2493) 
03-21 10:25:57.192: E/WindowManager(14488):  at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2463) 
03-21 10:25:57.192: E/WindowManager(14488):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1752) 
03-21 10:25:57.192: E/WindowManager(14488):  at android.os.Handler.dispatchMessage(Handler.java:99) 
03-21 10:25:57.192: E/WindowManager(14488):  at android.os.Looper.loop(Looper.java:143) 
03-21 10:25:57.192: E/WindowManager(14488):  at android.app.ActivityThread.main(ActivityThread.java:4914) 
03-21 10:25:57.192: E/WindowManager(14488):  at java.lang.reflect.Method.invokeNative(Native Method) 
03-21 10:25:57.192: E/WindowManager(14488):  at java.lang.reflect.Method.invoke(Method.java:521) 
03-21 10:25:57.192: E/WindowManager(14488):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858) 
03-21 10:25:57.192: E/WindowManager(14488):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
03-21 10:25:57.192: E/WindowManager(14488):  at dalvik.system.NativeStart.main(Native Method)

为什么你要显示一个对话框，如果应用程序会关闭呢？ – 2013-03-21 05:09:15

退出手段？ – 2013-03-21 05:14:56

我想确保用户真的想退出，而不是意外按回退键。 – 2013-03-21 05:15:50

答

你并没有放弃对话那是什么警告说它泄漏。

@Override 
    public void onClick(View v) { 
     // TODO Auto-generated method stub 

     // here you need to dismiss your dialog before finishing activity 
     if (dialoge != null) { 
      dialoge.cancel(); 
      dialoge = null; 
     } 

     MainActivity.this.finish(); 

    }

确保你检查'dialoge'为空！ – Tushar 2013-03-21 05:20:10

感谢兄弟，现在完美！ – 2013-03-21 05:24:13

答

你可以试一试只需要调用是这样的按钮：

Button yes=(Button)dialoge.findViewById(R.id.yes); 
    yes.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      dialoge.cancel(); 
      MainActivity.this.finish(); 

     } 
    });

对话框需要退出应用程序之前被取消。这就是为什么当对话框打开时显示leaked window error。

感谢兄弟，你是对的。 – 2013-03-21 05:25:32

那么刚刚投票！ – 2013-03-21 05:26:11

:-)已经完成！ – 2013-03-21 05:28:35

答

辞退对话框也叫dailog.dismiss()或dialog.cancel()完成活动后，我测试你的代码，它应该如下：

@Override 
public void onBackPressed() { 
    final Dialog dialoge=new Dialog(SecondActivity.this,android.R.style.Theme_Translucent_NoTitleBar); 
    dialoge.setContentView(R.layout.popup_layout); 

    Button yes=(Button)dialoge.findViewById(R.id.yes); 
    yes.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 

      finish(); 
      dialoge.cancel(); 

     } 
    }); 
    Button no=(Button)dialoge.findViewById(R.id.no); 
    no.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      finish(); 
      dialoge.dismiss(); 
     } 
    }); 


    dialoge.show(); 

}

答

dialoge.dismiss();

在按钮

的是你的onClick方法实现

onBackPressed（）显示错误

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