1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout
 3     xmlns:android="http://schemas.android.com/apk/res/android"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     tools:context="com.example.nanchen.fullscreendemo.MainActivity">
 8
 9     <ImageView
10         android:layout_width="match_parent"
11         android:layout_height="match_parent"
12         android:scaleType="centerCrop"
13         android:src="@drawable/test"/>
14 </RelativeLayout>

1 @Override
2     protected void onCreate(Bundle savedInstanceState) {
3         super.onCreate(savedInstanceState);
4         setContentView(R.layout.activity_main);
5
6         //   实现全屏，去掉系统标题栏，适合于游戏、电影等沉浸式体验
7         getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN);
8 }

1 if (VERSION.SDK_INT >= 21) {
2             getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
3                     | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
4             getWindow().setStatusBarColor(Color.TRANSPARENT);
5         }

 1         //另外一种方式
 2         if (VERSION.SDK_INT >= 21) {
 3             getWindow().getDecorView().setSystemUiVisibility(
 4                     View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
 5                             | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
 6                             | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
 7             );
 8             getWindow().setStatusBarColor(Color.TRANSPARENT);
 9             getWindow().setNavigationBarColor(Color.TRANSPARENT);
10         }

1 getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
2         | View.SYSTEM_UI_FLAG_FULLSCREEN);

 1 /**
 2      * 真正的沉浸式体验，适用于SDK>=19
 3      * 可以拉出导航栏
 4      */
 5     @Override
 6     public void onWindowFocusChanged(boolean hasFocus) {
 7         super.onWindowFocusChanged(hasFocus);
 8         if (hasFocus && VERSION.SDK_INT >= 19) {
 9             getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
10                     | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
11                     | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
12                     | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
13                     | View.SYSTEM_UI_FLAG_FULLSCREEN
14                     | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
15             );
16         }
17     }