沉浸式狀態欄

 if (Build.VERSION.SDK_INT >= 21) {
                View decorView = getWindow().getDecorView();
                int option = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
                decorView.setSystemUiVisibility(option);
                getWindow().setStatusBarColor(Color.TRANSPARENT);
            }
            ActionBar actionBar = getSupportActionBar();
            actionBar.hide();

< style name=“AppThemeTwo” parent=“Theme.AppCompat.Light.DarkActionBar”>
必須是DarkActionBar不能是NoActionBar 否則會空指針