本文介绍了创建自定义对话框时出现问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
我在创建自定义对话框时遇到问题.但我没有发现失败.希望有人可以帮助我...
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;
}
导致以下错误:
12-30 19:27:02.593: ERROR/AndroidRuntime(383): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
我检查了返回的对话框是否 == null - 但不是.
I checked if the returned dialog == null - but it isn't.
我还尝试了 http:///developer.android.com/guide/topics/ui/dialogs.html#CustomDialog
推荐答案
发现，对话框需要用
Dialog dialog = new Dialog(this);
而不是
Context mContext = getApplicationContext();
Dialog dialog = new Dialog(mContext);
我不知道为什么.也许有人可以向我解释一下?
I don't exactly know why. Perhaps anybody can explain it to me?
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