问题创建一个自定义对话框 [英] Problem creating a custom dialog

问题描述

我创建一个自定义对话框中的问题。但我没有找到故障。希望有人能帮助我...

I have a problem creating a custom dialog. But I don't find the failure. Hopefully anybody can help me ...

protected Dialog onCreateDialog(int id) {
    Dialog dialog = null;
    switch (id) {
    case DIALOG_ABOUT_ID:
        dialog = buildAboutDialog();
        break;
    default:
        dialog = null;
    }
    return dialog;
}

...

public Dialog buildAboutDialog() {
    Context mContext = getApplicationContext();
    Dialog dialog = new Dialog(mContext);

    dialog.setContentView(R.layout.about_dialog);
    dialog.setTitle("About this application");

    return dialog;
}

将导致以下错误：

Results in the following error:

12-30 19:27:02.593: ERROR/AndroidRuntime(383): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application

我检查如果返回的对话框==空 - 但不是

I checked if the returned dialog == null - but it isn't.

我也试过在 HTTP所述的第二种方法（充气）：/ /developer.android.com/guide/topics/ui/dialogs.html#CustomDialog

推荐答案

我发现，该对话框需要与

I found out, that the dialog needs to be created with

Dialog dialog = new Dialog(this);

而不是

Context mContext = getApplicationContext();
Dialog dialog = new Dialog(mContext);

我完全不知道是什么原因。也许，任何人都可以解释给我？

I don't exactly know why. Perhaps anybody can explain it to me?

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