前言

今天用Android Studio 生成Activity的时候，默认继承AppCompatActivity ，而在AndroidManifest.xml我对该Activity设置了一个主题，然后运行的时候报了错误：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.xtc.watch/com.xtc.watch.view.defaultprompt.activity.DefaultPromptActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.

如下所示：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.xtc.watch/com.xtc.watch.view.defaultprompt.activity.DefaultPromptActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2659)
         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2729)
         at android.app.ActivityThread.-wrap12(ActivityThread.java)
         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1576)
         at android.os.Handler.dispatchMessage(Handler.java:111)
         at android.os.Looper.loop(Looper.java:207)
         at android.app.ActivityThread.main(ActivityThread.java:5905)
         at java.lang.reflect.Method.invoke(Native Method)
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
      Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
         at android.support.v7.app.AppCompatDelegateImplBase.onCreate(AppCompatDelegateImplBase.java:124)
         at android.support.v7.app.AppCompatDelegateImplV7.onCreate(AppCompatDelegateImplV7.java:146)
         at android.support.v7.app.AppCompatActivity.onCreate(AppCompatActivity.java:59)
         at com.xtc.watch.view.defaultprompt.activity.DefaultPromptActivity.onCreate(DefaultPromptActivity.java:30)
         at android.app.Activity.performCreate(Activity.java:6298)
         at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1113)
         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2612)
         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2729) 
         at android.app.ActivityThread.-wrap12(ActivityThread.java) 
         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1576) 
         at android.os.Handler.dispatchMessage(Handler.java:111) 
         at android.os.Looper.loop(Looper.java:207) 
         at android.app.ActivityThread.main(ActivityThread.java:5905) 
         at java.lang.reflect.Method.invoke(Native Method) 
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888) 
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749) 

AndroidManifest.xml文件中关于该Activity的配置如下：

   <activity android:name=".view.defaultprompt.activity.DefaultPromptActivity"
               android:theme="@style/dialog_watch_upgrade_style">
         <intent-filter>
             <action android:name="android.intent.action.MAIN"/>
             <category android:name="android.intent.category.LAUNCHER"/>
         </intent-filter>
     </activity>

而DefaultPromptActivity继承于AppCompatActivity ，如下代码所示：

public class DefaultPromptActivity extends AppCompatActivity {

解决方法

我这里就无意中继承了ActionBarActivity，它来自android.support.v7.app.ActionBarActivity。
所以就要使用与其配合的AppCompat的theme才行，将DefaultPromptActivity改为继承于Activity ，如下代码所示：

public class DefaultPromptActivity extends Activity {

这个bug就解决了。

作者：欧阳鹏 欢迎转载，与人分享是进步的源泉！
转载请保留原文地址：http://blog.csdn.net/ouyang_peng/article/details/52749732