單例模式

public static Application instance;

	public static MyApplication getInstance() {// 單例模式中獲取唯一的ExitApplication實例
		if (null == instance) {
			instance = new MyApplication();
		}
		return (MyApplication) instance;
	}

以上是單例模式中獲取唯一的MyApplication實例

之前沒有用單例模式的時候，這麼調用的：

		MyApplication myApp = (MyApplication) this.getApplicationContext();
		myApp.finishListDraftActivity();

若使用單例模式則調用方法如下：

MyApplication.getInstance().finishListDraftActivity();