【正文】 and resume actions that were interrupted. These state transitions are all part of the activity lifecycle.Key words: W test statistic。 covariance matrix。 sensitivity附錄四：英文參考文獻2譯文活 動摘 要活動是一個應用程序組件，提供了一個用戶可以交互的屏幕，如撥打電話，拍照，發(fā)送電子郵件，或查看地圖，每個活動都是在一個窗口繪制它的用戶界面，通常的窗口填滿整個屏幕，但也可能在其他窗口上浮動。應用程序通常由多個活動組成，相互松散綁定，通常，一個應用程序中的活動被指定為“主要”活動，這是提供給用戶的第一次啟動應用程序，每個活動都可以啟動另一個活動以執(zhí)行不同的動作。每一次新的活動開始，以前的活動停止，但系統(tǒng)保存在堆棧中的活動（“回?！保．斠粋€新的活動開始，它被推到返回堆棧和用戶焦點?；囟褩Ｗ袷鼗镜摹昂筮M，先出”堆棧機制，因此，當用戶完成當前活動并按下返回按鈕，則彈出堆棧（和破壞）和恢復前一個活動。關鍵詞：組件；活動；生命周期；附錄五：英文參考文獻3原文Android Aladdin Knowledge SystemsAbstractAn Activity is an application ponent that provides a screen with which users can interact in order to do something, such as dial the phone, take a photo, send an , or view a map. Each activity is given a window in which to draw its user interface. The window typically fills the screen, but may be smaller than the screen and float on top of other windows.When an activity is stopped because a new activity starts, it is notified of this change in state through the activity39。s lifecycle callback methods. There are several callback methods that an activity might receive, due to a change in its state—whether the system is creating it, stopping it, resuming it, or destroying it—and each callback provides you the opportunity to perform specific work that39。s appropriate to that state change. When the activity resumes, you can reacquire the necessary resources and resume actions that were interrupted. These state transitions are all part of the activity lifecycle.Key words: laddin 。 credentials。technology附錄六：英文參考文獻4原文Agroforestry SystemsAbstractAn Activity is an application ponent that provides a screen with which users can interact in order to do something, such as dial the phone, take a photo, send an , or view a map. Each activity is given a window in which to draw its user interface. The window typically fills the screen, but may be smaller than the screen and float on top of other windows.When an activity is stopped because a new activity starts, it is notified of this change in state through the activity39。s lifecycle callback methods. There are several callback methods that an activity might receive, or destroying it—and each callback provides you the opportunity to perform specific work that39。s appropriate to that state change. For instance, when stopped, your activity should release any large objects, such as network or database connections. When the activity resumes, you can reacquire the necessary resources and resume actions that were interrupted. These state transitions are all part of the activity lifecycle.Key words: Java。 agroforestrytype。organization附錄七：程序部分源代碼package 。import 。import 。import 。import 。import 。import 。import 。import 。public class BaseActivity extends Activity{ public static ArrayListActivity allActivity=new ArrayListActivity()。 protected void onCreate(Bundle savedInstanceState) { (savedInstanceState)。 (this)。 } public static Activity getActivityByName(String name){ for(Activity ac:allActivity){ if(().getName().indexOf(name)0){ return ac。 }else{ return null。 } } return null。 } //監(jiān)聽用戶操作 public boolean onKeyDown(int keyCode,KeyEvent event){ if(==keyCode){ promptExit(this)。 } return (keyCode, event)。 } //退出程序 public void promptExit(Context context) { new (context) .setTitle() .setMessage() .setPositiveButton(, new () { public void onClick(DialogInterface dialog, int which) { for(Activity ac : allActivity){ if(ac!=null){ ()。 } } } }).setNegativeButton(, new () { public void onClick(DialogInterface dialog, int which) { ()。 } }).show()。 }}