Android studio怎样隐藏标题栏

Android studio怎样隐藏标题栏

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.xieth.as.imooc_how_old" >

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="人脸识别"
android:theme="@style/Theme.AppCompat.NoActionBar" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

android:theme="@style/Theme.AppCompat.NoActionBar" >

getSupportActionBar().hide();