安卓1.6：＆QUOT; android.view.WindowManager $ BadTokenException：无法添加窗口 - 令牌null不是一个申请表] [英] Android 1.6: "android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application"

问题描述

我想打开一个对话窗口，但每次我尝试打开它，它抛出这个异常：

I'm trying to open a dialog window, but every time I try to open it it throws this exception:

Uncaught handler: thread main exiting due to uncaught exception
android.view.WindowManager$BadTokenException: 
     Unable to add window -- token null is not for an application
  at android.view.ViewRoot.setView(ViewRoot.java:460)
  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
  at android.app.Dialog.show(Dialog.java:238)
  at android.app.Activity.showDialog(Activity.java:2413)

我通过调用的ShowDialog 与显示器的ID创建它。该 onCreateDialog 处理记录很好，我可以通过它一步没有问题，但我已经把它贴它，因为它看起来像我想的东西：

I'm creating it by calling showDialog with the display's id. The onCreateDialog handler logs fine and I can step through it without an issue, but I've attached it since it seems like I'm missing something:

@Override
public Dialog onCreateDialog(int id)
{
    Dialog dialog;
    Context appContext = this.getApplicationContext();
    switch(id)
    {
        case RENAME_DIALOG_ID:
            Log.i("Edit", "Creating rename dialog...");
            dialog = new Dialog(appContext);
            dialog.setContentView(R.layout.rename);
            dialog.setTitle("Rename " + noteName);
            break;
        default:
            dialog = null;
            break;
    }
    return dialog;      
}

有什么从此却下落不明？有些问题已经谈论过建立从的onCreate 的对话，这是因为该活动尚未创建的时候这个问题，但是这是从菜单对象的电话来了和 appContext 变量好像它是正确填充在调试器。

Is there something missing from this? Some questions have talked about having this problem when creating a dialog from onCreate, which happens because the activity isn't created yet, but this is coming from a call from a menu object, and the appContext variable seems like it is correctly populated in the debugger.

推荐答案

即。这条线： 背景appContext = this.getApplicationContext（）; 一定要去，而是你用一个指针，指向你在（可能这一点）的活动。

i.e. this line: Context appContext = this.getApplicationContext(); must go, and instead you use a pointer to the activity you're in (probably this).

我被咬伤今天这个也一样，烦人的部分是在 getApplicationContext（）是逐字从developer.android.com：（

I got bitten by this today too, the annoying part is the getApplicationContext() is verbatim from developer.android.com :(

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