Android framework中雙擊home 的實現

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正文

 

如果你需要做雙擊 home key 的檢測

你可以參考如下 sample code 自行實現

請修改 phoneWindowManager.java 的 interceptKeyBeforeQueueing 方法
找到參考位置後, 加入註釋所述代碼:

<span style="font-family:SimSun;font-size:10px;">  //以下是原有代碼, 即參考行
  if (down && (policyFlags & WindowManagerPolicy.FLAG_VIRTUAL) != 0
                && event.getRepeatCount() == 0) {
            performHapticFeedbackLw(null, HapticFeedbackConstants.VIRTUAL_KEY, false);
        }
  //參考行到此結束</span>

        int result = 0; //原爲 int result, 請加入初始值.
  // mtk sample code for double home click detection BEGIN.
  //請在類中補充 boolean homeDownDoubleClick = false; 的定義
  //請在類中補充 long lastHomeDownTime=0; 的定義
  //請在類中補充 long lastHomeUpTime=0; 的定義
  //檢測原理: 檢測上一次按下的 home key 與本次按下的 home key 時間間隔是否 < 500ms 
  //if yes, 則認爲是雙擊 home key 

<span style="font-family:SimSun;font-size:10px;">if(keyCode == KeyEvent.KEYCODE_HOME){
   if(down){
  // this is home down
  if(((event.getEventTime() - lastHomeDownTime) < 500)){
   homeDownDoubleClick = true;
  }else{
   homeDownDoubleClick = false;
  }
  lastHomeDownTime = event.getEventTime();
 }else{
  // then home up comes
  Log.d(TAG,"homeDownDoubleClick="+homeDownDoubleClick+",lastHomeDownTime="+lastHomeDownTime+",lastHomeUpTime="+lastHomeUpTime+",this home up="+event.getEventTime());
  if(homeDownDoubleClick && ((event.getEventTime() - lastHomeUpTime) < 500)){
   Log.d(TAG,"double click on home detected");
   try {
    IStatusBarService statusbar = getStatusBarService();
    if (statusbar != null) {
     statusbar.preloadRecentApps();
     statusbar.toggleRecentApps();
                }
            } catch (RemoteException e) {
    Slog.e(TAG, "RemoteException when preloading recent apps", e);
                mStatusBarService = null;
   }

   result |= ACTION_WAKE_UP;
   return result;
  }
  lastHomeUpTime = event.getEventTime();
 }
}</span>

  // mtk sample code for double home click detection END.