android - 窗口管理器坏 token 异常

Question

您好，我在“消息”对话框中遇到问题，在此处强制关闭我的代码。

在创建中:

  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.email_result);

    email_result = (Button) findViewById(R.id.email_result_btn);
    email_result.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {


            if (diffdays > 365) {

                h.sendEmptyMessage(0);
              }
         }
     }
  }

我的处理程序:

private Handler h = new Handler() {
    public void handleMessage(Message msg) {
           showMessageDialog("Sorry, you cannot email entries which are earlier than one year ago.");
    }
};

ShowMessageDialog 方法:

public void showMessageDialog(String nMessage) {

    alertDialog = new Dialog(Email_Result.this);
    AlertDialog.Builder customBuilder = new AlertDialog.Builder(
            Email_Result.this);
    customBuilder.setMessage(nMessage);
    customBuilder.setPositiveButton(getString(R.string.ok),
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    alertDialog.dismiss();
                }
            });
    alertDialog = customBuilder.create();
    alertDialog.setCancelable(true);
    alertDialog.show();
}

错误日志

01-11 12:08:24.470: ERROR/AndroidRuntime(325): FATAL EXCEPTION: main
01-11 12:08:24.470: ERROR/AndroidRuntime(325): android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@44f1dfd8 is not valid; is your activity running?
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at android.view.ViewRoot.setView(ViewRoot.java:505)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at android.view.Window$LocalWindowManager.addView(Window.java:424)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at android.app.Dialog.show(Dialog.java:241)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at com.stress1.Email_Result.showMessageDialog(Email_Result.java:207)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at com.stress1.Email_Result$2.onClick(Email_Result.java:81)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at android.view.View.performClick(View.java:2408)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at android.view.View$PerformClick.run(View.java:8816)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at android.os.Handler.handleCallback(Handler.java:587)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at android.os.Handler.dispatchMessage(Handler.java:92)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at android.os.Looper.loop(Looper.java:123)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at android.app.ActivityThread.main(ActivityThread.java:4627)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at java.lang.reflect.Method.invokeNative(Native Method)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at java.lang.reflect.Method.invoke(Method.java:521)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-11 12:08:24.470: ERROR/AndroidRuntime(325):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

当您在 Dialog 上调用 show() 方法时，似乎发生了异常。尝试使用以下可能会绕过您的问题的代码:

 try {
      alertDialog.show();
 } catch(Exception e){
   // WindowManager$BadTokenException will be caught and the app would not display 
   // the 'Force Close' message
 }

当 Activity 试图在它已经终止后显示 AlertDialog 时，就会出现这样的问题。因此，您可能需要仔细查看代码的工作原理。

此外，您的 showMessageDialog 方法可以简化如下:

public void showMessageDialog(String nMessage) {

    AlertDialog.Builder customBuilder = new AlertDialog.Builder(Email_Result.this);
    customBuilder.setMessage(nMessage);
    customBuilder.setPositiveButton(getString(R.string.ok),new DialogInterface.OnClickListener(){
         @Override            
         public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
         }
    });
    customBuilder.setCancelable(true);
    customBuilder.show();
}