雙擊事件

void BackHome(){
            if (Application.platform==RuntimePlatform.Android&&Input.GetKeyDown(KeyCode.Escape)) {
                a+=1;
                StartCoroutine("aValueClear",0.4f);
            }
            if (a == 2) {
                Debug.Log("quit");
                Application.Quit ();
            }
            if (Application.platform==RuntimePlatform.Android&&Input.GetKeyDown(KeyCode.Home)) {
                Application.Quit();
            }
        }