android 隱藏狀態欄和導航欄

@Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        NavigationBarStatusBar(this,hasFocus);
    }

    /**
     * 導航欄，狀態欄隱藏
     * @param activity
     */
    public void NavigationBarStatusBar(Activity activity, boolean hasFocus){
//        if (hasFocus && Build.VERSION.SDK_INT >= 19) { //這個註釋的能用，但是在多個頁面需要隱藏導航欄時跳轉會導致導航欄彈出
//            View decorView = activity.getWindow().getDecorView();
//            decorView.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);
//        }

        if (hasFocus && Build.VERSION.SDK_INT >= 19) {
            int flag = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                    | SYSTEM_UI_FLAG_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
            flag |= 0x00001000;
            View decorView = activity.getWindow().getDecorView();
            decorView.setSystemUiVisibility(
                    flag);
        }
    }

    /**
     *
     * @param activity 此方法可以實現隱藏導航欄，但是一旦點擊屏幕，導航欄就會彈出，無法隱藏
     * @param
     */
    public void setNavigationBar(Activity activity,int visible){
        View decorView = activity.getWindow().getDecorView();
        //顯示NavigationBar
        if (View.GONE == visible){
            int option = SYSTEM_UI_FLAG_HIDE_NAVIGATION;
            decorView.setSystemUiVisibility(option);
        }
    }

這個方法時官方demo中給的，以前沒注意，用起來也沒有問題。比較簡潔，在適當方法中調用即可
view 可以用getWindow().getDecorView()替代

view.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE
                | View.SYSTEM_UI_FLAG_FULLSCREEN
                | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);