如何隱藏Android系統按鈕面板？

Question

我需要在運行時切換到全屏模式（播放器應用程序），並返回到用戶點擊，所以它應該隱藏android系統欄（頂部）和後面，應用程序，菜單軟件按鈕面板（底部）。

如何隱藏底部面板與軟件按鈕？

PS。我已經使用getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN);，但它並不能幫助：

Answer 1

請參考官方文檔。

View decorView = getWindow().getDecorView(); 
// Hide both the navigation bar and the status bar. 
// SYSTEM_UI_FLAG_FULLSCREEN is only available on Android 4.1 and higher, but as 
// a general rule, you should design your app to hide the status bar whenever you 
// hide the navigation bar. 
int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION 
       | View.SYSTEM_UI_FLAG_FULLSCREEN; 
decorView.setSystemUiVisibility(uiOptions); 

請參閱http://developer.android.com/training/system-ui/navigation.html和http://developer.android.com/training/system-ui/visibility.html

Answer 2

使用Immersive Full-Screen Mode似乎也不錯。

此外，還有是如何做到這一點的例子：http://developer.android.com/samples/ImmersiveMode/project.html

並檢查該Fragment：http://developer.android.com/samples/ImmersiveMode/src/com.example.android.immersivemode/ImmersiveModeFragment.html

他們使用：decorView = getActivity().getWindow().getDecorView();

@Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
     super.onActivityCreated(savedInstanceState); 
     final View decorView = getActivity().getWindow().getDecorView(); 
     decorView.setOnSystemUiVisibilityChangeListener(
       new View.OnSystemUiVisibilityChangeListener() { 
        @Override 
        public void onSystemUiVisibilityChange(int i) { 
         int height = decorView.getHeight(); 
         Log.i(TAG, "Current height: " + height); 
        } 
       }); 

在這裏你可以看到它適用於不同的版本（API）：

/** 
    * Detects and toggles immersive mode (also known as "hidey bar" mode). 
    */ 
    public void toggleHideyBar() { 

     // The UI options currently enabled are represented by a bitfield. 
     // getSystemUiVisibility() gives us that bitfield. 
     int uiOptions = getActivity().getWindow().getDecorView().getSystemUiVisibility(); 
     int newUiOptions = uiOptions; 
     boolean isImmersiveModeEnabled = 
       ((uiOptions | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY) == uiOptions); 
     if (isImmersiveModeEnabled) { 
      Log.i(TAG, "Turning immersive mode mode off. "); 
     } else { 
      Log.i(TAG, "Turning immersive mode mode on."); 
     } 

     // Navigation bar hiding: Backwards compatible to ICS. 
     if (Build.VERSION.SDK_INT >= 14) { 
      newUiOptions ^= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION; 
     } 

     // Status bar hiding: Backwards compatible to Jellybean 
     if (Build.VERSION.SDK_INT >= 16) { 
      newUiOptions ^= View.SYSTEM_UI_FLAG_FULLSCREEN; 
     } 

     // Immersive mode: Backward compatible to KitKat. 
     // Note that this flag doesn't do anything by itself, it only augments the behavior 
     // of HIDE_NAVIGATION and FLAG_FULLSCREEN. For the purposes of this sample 
     // all three flags are being toggled together. 
     // Note that there are two immersive mode UI flags, one of which is referred to as "sticky". 
     // Sticky immersive mode differs in that it makes the navigation and status bars 
     // semi-transparent, and the UI flag does not get cleared when the user interacts with 
     // the screen. 
     if (Build.VERSION.SDK_INT >= 18) { 
      newUiOptions ^= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY; 
     } 

     getActivity().getWindow().getDecorView().setSystemUiVisibility(newUiOptions); 
    }