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Android背景處理解決方法
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Android背景處理解決方法
1.
ANDROID 背景作業處理
2.
Thread Thread類別中,並沒有thread執行完成的通知 機制,如果想讓thread做完事情後進行通知的 動作,那就必須透過handler的訊息發送機制, 在thread做完事後,送訊息至訊息佇列。 Android主Thread(UIThread),只要超過5秒沒 回應(或OnCreate()超過10秒),程式就會被當 作無回應。
3.
Thread
4.
Handler
5.
AsyncTask Class AsyncTask的定義: public abstract
class AsyncTask<Params, Progress, Result> {…} 三種泛型類型分別代表“啟動任務執行的輸入參 數”、“後台任務執行的進度”、“後台計算結果的 類型”。在特定場合下,並不是所有類型都被使 用,如果沒有被使用,可以用java.lang.Void類 型代替。
6.
AsyncTack 使用時 1.非同步任務的物件必須在UI線程(主thread)中創 建。 2.execute(Params... params)方法必須在UI線程中 呼叫。 3.不要在主thread呼叫onPreExecute(), doInBackground(Params...
params), onProgressUpdate(Progress... values), onPostExecute(Result result)這幾個方法。 4.不能在doInBackground(Params... params)中更 改UI。 5.一個任務物件只能執行一次,如果執行第二次會 出錯。
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