#1、错误描述
今天,想实现Activity不显示标题栏的效果，在项目的AndroidManifest.xml文件，对相应的Activity添加属性
android:theme="@android:style/Theme.NoTitleBar"具体代码如下：
<activity android:name=".module.view.activity.KuwoMusicPlayActivity"
android:theme="@android:style/Theme.NoTitleBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>结果运行app的时候，报了如下错误：
java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.具体错误log如下：
01-01 01:33:41.950 6637-6637/com.xtc.kuwo E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.xtc.kuwo, PID: 6637
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.xtc.kuwo/com.xtc.kuwo.module.view.activity.KuwoMusicPlayActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:955)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:750)
Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
at android.support.v7.app.AppCompatDelegateImplV7.createSubDecor(AppCompatDelegateImplV7.java:340)
at android.support.v7.app.AppCompatDelegateImplV7.ensureSubDecor(AppCompatDelegateImplV7.java:309)
at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:273)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:136)
at com.xtc.kuwo.module.view.activity.KuwoMusicPlayActivity.onCreate(KuwoMusicPlayActivity.java:57)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)?
at android.app.ActivityThread.access$800(ActivityThread.java:151)?
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)?
at android.os.Handler.dispatchMessage(Handler.java:102)?
at android.os.Looper.loop(Looper.java:135)?
at android.app.ActivityThread.main(ActivityThread.java:5254)?
at java.lang.reflect.Method.invoke(Native Method)?
at java.lang.reflect.Method.invoke(Method.java:372)?
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:955)?
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:750)?如下图所示： 
2、错误分析
原来我的Activity继承自 android.support.v7.app.AppCompatActivity，而不是 android.app.Activity。
3、解决方法
方法1：
创建的activity时，如果不是那么强烈需要继承自AppCompatActivity，就直接继承Activity。
如将activity继承自AppCompatActivity：
public class MainActivity extends ActionBarActivity 改成activity继承自Activity：
public class MainActivity extends Activity方法2：
还是想继承自AppCompatActivity，那么根据提示来使用AppCompat的theme，即将AndroidManifest.xml文件中关于Activity的主题配置改成：
android:theme="@style/Theme.AppCompat.Light.NoActionBar"完整代码如下：
<activity android:name=".module.view.activity.KuwoMusicPlayActivity"
android:theme="@style/Theme.AppCompat.Light.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>问题解决！
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
