无法创建AlertDialog:AppCompat错误 [英] Cannot create AlertDialog: AppCompat error

问题描述

我正在尝试创建一个AlertDialog，如下所示:

I am trying to create an AlertDialog like this:

counterButton.setOnLongClickListener(new View.OnLongClickListener() {
    @Override
    public boolean onLongClick(View v) {

        new AlertDialog.Builder(context)
                .setTitle("Delete entry")
                .setMessage("Are you sure you want to delete this entry?")
                .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        // continue with delete
                    }
                })
                .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        // do nothing
                    }
                })
                .setIcon(android.R.drawable.ic_dialog_alert)
                .show();  // <------- crashes here

        return true;
    }
});

我正在为我的应用程序使用AppCompat主题.这是我的AndroidManifest.xml的application元素:

I am using an AppCompat theme for my app. Here is the application element of my AndroidManifest.xml:

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/Theme.AppCompat.Light.NoActionBar">
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:screenOrientation="portrait"
        >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

如您所见，我的主题设置为@style/Theme.AppCompat.Light.NoActionBar. 但是，每当我运行我的应用程序时，它都会崩溃并显示以下错误消息:

As you can see, my theme is set to @style/Theme.AppCompat.Light.NoActionBar. But whenever I am running my app it crashes with the following error message:

java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.

我在Google上搜索了很多东西，并在SO上找到了一些类似的问题，但是并没有解决问题.我正在使用AppCompat主题，所以我在做什么错了?

I googled a lot and found a few similar questions at SO but didn't manage to solve the problem. I am using an AppCompat theme, so what am I doing wrong?

推荐答案

由于您的主题与您的Activity有关，因此您必须将其传递为context到AlertDialog.Builder-getApplicationContext()没有主题附加到这就是为什么您遇到错误的原因.

Since your theme is related to your Activity, you must pass it as the context to AlertDialog.Builder - getApplicationContext() has no theme attached to it which is why you are getting an error.

这篇关于无法创建AlertDialog:AppCompat错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！