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?