Android Studio运行报错：You need to use a Theme.AppCompat theme (or descendant) with this activity. 的解决办法

#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：

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：

问题解决！