編輯電子書 - 行程種類與優先順序

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									<td>Android行程種類與優先順序</td>
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									<td>活動行程（關鍵優先順序）</td>
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									<td>處於狀態正在運行中的前景Activity或廣播接收器。</td>
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									<td>可見行程（高優先順序）</td>
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									<td>處於狀態正在運行中的前景Activity，但是被另一個Activity遮擋時（遮一半或半透明），此行程被回收大蓋只有在資源極度匱乏之下才會發生。</td>
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									<td>服務行程（次高優先順序）</td>
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									<td>服務行程是指沒有支援界面下的程序，屬於不可見的行程。優先順序僅比可見行程稍低，基本上也是除非資源在當下真的非常匱乏才會發生回收現象。</td>
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									<td>背景行程（低優先順序）</td>
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									<td>不可見非服務行程的程序，這類的程序很容易會當前景資源不足時，優先被回收。</td>
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									<td>空行程（極低優先順序）</td>
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									<td>為了提高整體性能，Android會經常在應用程式結束後保留其狀態在記憶體，為的是預備給使用者第二次再次呼叫此APP時，速度加快減少啟動時間。空行程過多時，Android會自動清除，減少被再次使用資源快取。</td>
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