Fix system bars being displayed when using immersive mode on many custom ROMs

[klinker41]

[MewX]

BUG still exist in your codes :( And I don't know how to solve this, it's a custom ROM.

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First I call showNavigationBar().

private void showNavigationBar() {
        // set navigation bar status, remember to disable "setNavigationBarTintEnabled"
        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_IMMERSIVE_STICKY;
        // This work only for android 4.4+
        if(Build.VERSION.SDK_INT >= 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);
                    }
                }
            });
        }
    }

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Then, I call these functions.

            tintManager = new SystemBarTintManager(this);
            // enable all tint
            tintManager.setStatusBarTintEnabled(true);
            tintManager.setNavigationBarTintEnabled(true);
            tintManager.setTintAlpha(0.0f);
            // set all color
            tintManager.setTintColor(getResources().getColor(android.R.color.black));
            tintManager.setStatusBarAlpha(0.90f);
            tintManager.setNavigationBarAlpha(0.80f); // TODO: fix bug