第一次執行APP，按Home後，無法回到上次狀態，再回到APP總是啟動 MainActivity
APP結構如下:
APP共有 Activity A 與 Activity B
點 A 的 item 會啟動 Activity B
問題發生情境:
由 google 商店下載，或者是手動安裝 apk 的 app
第一次啟動 APP 後，點選 Activity A 中的 item 啟動了 Activity B
此時按 Home 鍵離開 APP
再次點選 APP 後，卻出現 Activity A
正常的情況下:
當點選 Activity A 的 item 並啟動 Activity B 以後，接著按下 Home 鍵會離開 APP 並回到手機桌面
當再次點選 APP 時，理論上應該要出現 Activity B
當問題發生時
但是此時點選 Back 鍵時，又會跳出 Activity B
再點一次 Back ，就會跳回Activity A
再點一次 Back，就跳回手機桌面
在這之後，一切都開始正常運作了
也就是問題情境只會發生在剛下載 APP 後的第一次執行
解法就是
在 Activity A 的 onCreate() 內
加入已下程式碼即可
[sourcecode language=”JAVA”]
<pre>if (!isTaskRoot()) {
final Intent intent = getIntent();
final String intentAction = intent.getAction();
if (intent.hasCategory(Intent.CATEGORY_LAUNCHER) &&
intentAction != null && intentAction.equals(Intent.ACTION_MAIN)) {
finish();
}
}
[/sourcecode]
資料來源參考: https://code.google.com/p/android/issues/detail?id=2373
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