//狀態列、導航欄都透明
private void hideStatusBarNavigationBar() {
        if (Build.VERSION.SDK_INT = Build.VERSION_CODES.LOLLIPOP) {
            Window window = getWindow();
            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS  WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
            window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN  View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION  View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.setStatusBarColor(Color.TRANSPARENT);
            window.setNavigationBarColor(Color.TRANSPARENT);
            return;
        }
        if (Build.VERSION.SDK_INT = Build.VERSION_CODES.KITKAT) {
            getWindow().addFlags( WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            getWindow().addFlags( WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);

        }
    }