我该如何修复此错误：您需要在此活动中使用 Theme.AppCompat 主题（或后代）

我搜索了所有互联网网站来修复此错误，但我无法解决。我只想创建带有两个按钮“是”和“否”的 AlertDialog。

这是我的代码：

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class DialogActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_dialog);

    Button btnDialog= (Button) findViewById(R.id.btnDialog);
    btnDialog.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showDialogMessage();
        }
    });
}

private void showDialogMessage(){

    AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());
    // Add the buttons
    builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            // User clicked OK button
        }
    });
    builder.setNegativeButton("NO", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            // User cancelled the dialog
        }
    });

    AlertDialog dialog = builder.create();
    dialog.show();
}
}

这是我的风格：

<resources>

<!-- Base application theme. -->
<style name="AppTheme" parent="AppTheme.Base">
    <!-- Customize your theme here. -->
</style>

<style name="AppTheme.Base" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

这是我的风格（v21）：

<resources>
<!-- extend one of the Theme.AppCompat themes -->
<style name="AppTheme" parent="AppTheme.Base">
    <!-- customize the color palette -->
    <item name="android:colorPrimary">@color/colorPrimary</item>
    <item name="android:colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="android:colorAccent">@color/colorAccent</item>
    <item name="android:windowTranslucentStatus">true</item>
    <item name="android:colorControlHighlight">@color/colorHighLight</item>
</style>
</resources>

这是显而易见的：

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.saly.rastari" >   
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".DialogActivity"
            android:label="@string/title_activity_test"
            android:screenOrientation="portrait" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>       
    </application>
</manifest>

当我单击对话框按钮时，出现此错误：

11-02 04:36:55.941 24352-24352/? E/AndroidRuntime: FATAL EXCEPTION: main
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime: Process: com.irannara.pda.pdaassistant, PID: 24352
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at android.support.v7.app.AppCompatDelegateImplV7.createSubDecor(AppCompatDelegateImplV7.java:309)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at android.support.v7.app.AppCompatDelegateImplV7.ensureSubDecor(AppCompatDelegateImplV7.java:278)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:252)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at android.support.v7.app.AppCompatDialog.setContentView(AppCompatDialog.java:76)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at android.support.v7.app.AlertController.installContent(AlertController.java:216)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at android.support.v7.app.AlertDialog.onCreate(AlertDialog.java:240)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at android.app.Dialog.dispatchOnCreate(Dialog.java:373)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at android.app.Dialog.show(Dialog.java:274)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at com.irannara.pda.pdaassistant.DialogActivity.showDialogMessage(DialogActivity.java:42)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at com.irannara.pda.pdaassistant.DialogActivity.access$000(DialogActivity.java:10)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at com.irannara.pda.pdaassistant.DialogActivity$1.onClick(DialogActivity.java:21)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at android.view.View.performClick(View.java:4780)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at android.view.View$PerformClick.run(View.java:19866)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at android.os.Handler.handleCallback(Handler.java:739)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:95)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:135)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5254)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:372)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
11-02 04:36:55.941 24352-24352/? E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
11-02 04:36:55.959 718-718/? E/EGL_emulation: tid 718: eglCreateSyncKHR(1209): error 0x3004 (EGL_BAD_ATTRIBUTE)

这些链接都不能帮助我：

• 您需要在此活动中使用 Theme.AppCompat 主题（或后代） https://stackoverflow.com/questions/21814825/you-need-to-use-a-theme-appcompat-theme-or-descendant-with-this-activity

• ActionBarCompat：java.lang.IllegalStateException：您需要使用 Theme.AppCompat https://stackoverflow.com/questions/18063395/actionbarcompat-java-lang-illegalstateexception-you-need-to-use-a-theme-appcom

• 需要在此活动中使用 Theme.AppCompat 主题（或后代）？？？ https://teamtreehouse.com/community/need-to-use-a-themeappcompat-theme-or-descendant-with-this-activity

和更多。

我怎样才能解决这个问题？

如果您在另一个值文件夹中还有其他样式文件，例如“values-v11", "values-v14“...还要编辑主题并尝试在运行之前清理您的应用程序。

编辑： 从您的活动变化来看getApplicationContext() to this:

AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());

to

AlertDialog.Builder builder = new AlertDialog.Builder(this);

因为对话框还应该扩展Appcompat Theme.