Hello.
Task: hide NavigationBar in the Android application (API 16).
I read the documentation: Hiding the Navigation Bar and Responding to UI Visibility Changes . From them I realized that you can hide, but before the first click, then the flags are reset. To fix this you need to install a listener.
Everywhere used the code from the documentation.
Problem: The setOnSystemUiVisibilityChangeListener listener setOnSystemUiVisibilityChangeListener called once. In debugg, it works fine: it is constantly redrawn. Under normal operation of the application - from him there is no sense. Why?

    1 answer 1

    The solution is from here . Perhaps you, too, fit.

     private int currentApiVersion; @Override @SuppressLint("NewApi") protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); currentApiVersion = android.os.Build.VERSION.SDK_INT; final int flags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY; // This work only for android 4.4+ if(currentApiVersion >= Build.VERSION_CODES.KITKAT) { getWindow().getDecorView().setSystemUiVisibility(flags); // Code below is to handle presses of Volume up or Volume down. // Without this, after pressing volume buttons, the navigation bar will // show up and won't hide final View decorView = getWindow().getDecorView(); decorView .setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() { @Override public void onSystemUiVisibilityChange(int visibility) { if((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) { decorView.setSystemUiVisibility(flags); } } }); } } @SuppressLint("NewApi") @Override public void onWindowFocusChanged(boolean hasFocus) { super.onWindowFocusChanged(hasFocus); if(currentApiVersion >= Build.VERSION_CODES.KITKAT && hasFocus) { getWindow().getDecorView().setSystemUiVisibility( View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY); } }
    • Read this question. There it is indicated that this is a solution for Android 4.4+ , (i.e. API 19). My problem occurs on 16 api. - Jorik