requestWindowFeature(Window.FEATURE_NO_TITLE)

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
     requestWindowFeature(Window.FEATURE_NO_TITLE);####
    setContentView(R.layout.activity_main);


VFY: unable to resolve virtual method 11342: Landroid/view/ViewGroup;.onNestedScrollAccepted (Landroid/view/View;Landroid/view/View;I)V

我再用配置主题解决

<style name="AppBaseTheme" parent="Theme.AppCompat.Light">
</style>

<!-- Application theme. -->
<style name="AppTheme" parent="AppBaseTheme">
</style>
<!-- 定义不现实标题 -->
<style name="notitle">
 <item name="android:windowNoTitle">true</item>
</style>

清单里加

 android:allowBackup="true"
 android:icon="@drawable/img_1"
 android:label="@string/app_name"
 android:theme="@style/AppTheme" >
 android:name=".MainActivity"
 android:label="@string/app_name"
 android:theme="@style/notitle"##
 >

                又报错

                    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lzl.top01/com.lzl.top01.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.

                第二种方法我前面一个项目都能用啊  这个就报错