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Activity 行為小研究
前言
在我們初學的時候,在開啟另外一個Activity時常常使用到下列Code:
Intent intent = new Intent();
Intent.setClass(this, SomeActivity.class);
startActivity(intent);
可是這段Code弄不好會造成OOM,現在讓我們來研究成因吧!
測試架構
現在,讓我們來創立兩個 Activity 來架
設測試環境。
在每個Activity都放上Button 跳到另外
的Activity。
塞入測試點
我們在以下Method都塞入Intent以方便
做測試
 onCreate
 onStart
 onResume
 onStop
 onDestroy
頁面跳轉邏輯
我們在Button上面加Listener使其可以開
啟另外一個頁面
開始測試
我們現在來看看用這樣子切換Activity會發生什麼事情吧!
跳到Activity1 又跳回來
觀察結果
我們發現每次跳都會另外create 一個Activity!
那之前的呢?
抱歉,放著
所以執行完這個動作後,我們會得到三個Activity
在我們的系統內!
解決方案
這邊是找到的Solution
https://inthecheesefactory.com/blog/
understand-android-activity-
launchmode/en
或者可搜尋
“Understand Android Activity's
launchMode”
我們可以把Launch Mode 選項加入
Manifest中
讓我們用singleInstance看看
再度測試
測試結果
我們發現這次沒有onCreate了!
就這樣我們很輕易地解決了Activity 重複在Application出現的問題了!
有沒有很方便呢!?
謝謝大家!

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