[工作累积] Android: Hide Navigation bar 隐藏导航条

1 View decorView = getWindow().getDecorView();2 // Hide both the navigation bar and the status bar.3 // SYSTEM_UI_FLAG_FULLSCREEN is only available on Android 4.1 and higher, but as4 // a general rule, you should design your app to hide the status bar whenever you5 // hide the navigation bar.6 int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION7               | View.SYSTEM_UI_FLAG_FULLSCREEN;8 decorView.setSystemUiVisibility(uiOptions);

 1 // This snippet hides the system bars. 2 private void hideSystemUI() { 3     // Set the IMMERSIVE flag. 4     // Set the content to appear under the system bars so that the content 5     // doesn't resize when the system bars hide and show. 6     mDecorView.setSystemUiVisibility( 7             View.SYSTEM_UI_FLAG_LAYOUT_STABLE 8             | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 9             | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN10             | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav bar11             | View.SYSTEM_UI_FLAG_FULLSCREEN // hide status bar12             | View.SYSTEM_UI_FLAG_IMMERSIVE);13 }14 15 // This snippet shows the system bars. It does this by removing all the flags16 // except for the ones that make the content appear under the system bars.17 private void showSystemUI() {18     mDecorView.setSystemUiVisibility(19             View.SYSTEM_UI_FLAG_LAYOUT_STABLE20             | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION21             | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);22 }

 1     ////////////////////////////////////////////////////////////////////////// 2     public void hideNavigationBar() { 3         int uiFlags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE 4             | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 5             | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN 6             | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav bar 7             | View.SYSTEM_UI_FLAG_FULLSCREEN; // hide status bar 8  9         if( android.os.Build.VERSION.SDK_INT >= 19 ){ 10             uiFlags |= 0x00001000;    //SYSTEM_UI_FLAG_IMMERSIVE_STICKY: hide navigation bars - compatibility: building API level is lower thatn 19, use magic number directly for higher API target level11         } else {12             uiFlags |= View.SYSTEM_UI_FLAG_LOW_PROFILE;13         }14 15         getWindow().getDecorView().setSystemUiVisibility(uiFlags);16     }17 18 19     //////////////////////////////////////////////////////////////////////////20     @Override21     protected void onCreate (Bundle savedInstanceState) {22         ...23         hideNavigationBar();24         super.onCreate(savedInstanceState);25         ...26     }27 28     //////////////////////////////////////////////////////////////////////////29     @Override30     public void onWindowFocusChanged(boolean hasFocus) {31         super.onWindowFocusChanged(hasFocus);32         if( hasFocus ) {33             hideNavigationBar();34         }35     }