<resources xmlns:android="http://schemas.android.com/apk/res/android">  <!-- Application theme. -->  <style name="AppTheme" parent="AppBaseTheme">    <item name="android:windowNoTitle">true</item></resources>

public class MainActivity extends Activity{  @Override  protected void onCreate(Bundle savedInstanceState){    super.onCreate(savedInstanceState);    // 隱藏標題欄    requestWindowFeature(Window.FEATURE_NO_TITLE);    // 隱藏狀態欄    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,    WindowManager.LayoutParams.FLAG_FULLSCREEN);    //一定要放在setContentView()之前！    setContentView(R.layout.activity_main);  }}

<!-- 同時隱藏狀態欄和標題欄 --><activity  android:name="com.ysj.demo.MainActivity"  android:theme="@android:style/Theme.NoTitleBar.Fullscreen"  android:label="@string/app_name" >  <intent-filter>    <action android:name="android.intent.action.MAIN" />    <category android:name="android.intent.category.LAUNCHER" />  </intent-filter></activity>