Android framework中双击home 的实现

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如果你需要做双击 home key 的检测

你可以参考如下 sample code 自行实现

请修改 phoneWindowManager.java 的 interceptKeyBeforeQueueing 方法
找到参考位置后, 加入注释所述代码:

  //以下是原有代码, 即参考行  if (down && (policyFlags & WindowManagerPolicy.FLAG_VIRTUAL) != 0                && event.getRepeatCount() == 0) {            performHapticFeedbackLw(null, HapticFeedbackConstants.VIRTUAL_KEY, false);        }  //参考行到此结束

int result = 0; //原为 int result, 请加入初始值.
// mtk sample code for double home click detection BEGIN.
   //请在类中补充 boolean homeDownDoubleClick = false; 的定义
  //请在类中补充 long lastHomeDownTime=0; 的定义
  //请在类中补充 long lastHomeUpTime=0; 的定义
   //检测原理: 检测上一次按下的 home key 与本次按下的 home key 时间间隔是否 < 500ms
  //if yes, 则认为是双击 home key

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(); }}

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