彻底解决错误：You need to use a Theme.AppCompat theme

报错如下：

Java.lang.RuntimeException: Unable to start activity ComponentInfo{com.chs.mt.gd_tosicke/com.chs.mt.gd_tosicke.main.WelcomeActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2747)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2808)
   at android.app.ActivityThread.-wrap12(ActivityThread.java)
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1541)
   at android.os.Handler.dispatchMessage(Handler.java:102)
   at android.os.Looper.loop(Looper.java:165)
   at android.app.ActivityThread.main(ActivityThread.java:6375)
   at java.lang.reflect.Method.invoke(Native Method)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:883)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
   at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:356)
   at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:325)
   at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:286)
   at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
   at com.chs.mt.gd_tosicke.main.WelcomeActivity.onCreate(WelcomeActivity.java:25)
   at android.app.Activity.performCreate(Activity.java:6845)
   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2700)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2808) 
   at android.app.ActivityThread.-wrap12(ActivityThread.java) 
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1541) 
   at android.os.Handler.dispatchMessage(Handler.java:102) 
   at android.os.Looper.loop(Looper.java:165) 
   at android.app.ActivityThread.main(ActivityThread.java:6375) 
   at java.lang.reflect.Method.invoke(Native Method) 
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:883) 
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) 

这个问题困扰了我一个下午，我的代码是这么写的

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.design.widget.TabLayout
        android:id="@+id/toolbar_tab"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_gravity="bottom"
        android:background="#000000"
        android:fillViewport="false"
        app:layout_scrollFlags="scroll"
        app:tabIndicatorColor="#FF4081"
        app:tabIndicatorHeight="1.0dp"
        app:tabMode="fixed"
        app:tabSelectedTextColor="#FF4081"
        app:tabTextColor="#ced0d3">
        <android.support.design.widget.TabItem
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="主页" />

        <android.support.design.widget.TabItem
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="聆听位" />

        <android.support.design.widget.TabItem
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="EQ" />

    </android.support.design.widget.TabLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

直接崩溃 

然后我们需要做这两步操作就可以啦

第一步：在Testz\app\build.gradle，添加绿色这两句

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:26.0.0-alpha1'
    compile 'com.android.support:design:25.0.0'
    compile 'com.android.support.constraint:constraint-layout:1.0.0-beta5'
    testCompile 'junit:junit:4.12'
}

第二步：在我们需要的界面activity中添加，绿色部分

<activity android:name="com.chs.mt.gd_tosicke.main.MainActivity"
    android:windowSoftInputMode="stateHidden|adjustPan"
    android:theme="@style/AppThemeprice"
    android:screenOrientation="portrait"
    >

然后去style.xml添加

<style name="AppThemeprice" parent="Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
</style>

然后问题解决，详情请咨询2494075190