ActivityManager mActivityManager = MyManager.getActivityManager(mContext);
     List<ActivityManager.RunningAppProcessInfo> process = mActivityManager.getRunningAppProcesses();
     for(int i=;i<process.size();i++){
      ActivityManager.RunningAppProcessInfo ar = process.get(i);
      String packageName = ar.processName;
      packageName = packageName.split(":")[];
      //重要级别大于，并且不被信任的后台将被杀掉
      if(ar.importance> && !MyManager.isTrust(packageName)){
       MyManager.getActivityManager(mContext).killBackgroundProcesses(packageName);
      }
     } 

 WindowManager windowManager = getWindowManager(context); 
   int screenWidth = windowManager.getDefaultDisplay().getWidth();
   int screenHeight = windowManager.getDefaultDisplay().getHeight();
   if(mSmallFloatWin==null){
    mSmallFloatWin = new SmallFloatWin(context);
    if (smallWindowParams == null) { 
     smallWindowParams = new LayoutParams(); 
     smallWindowParams.type = LayoutParams.TYPE_PHONE; 
     smallWindowParams.format = PixelFormat.RGBA_; 
     smallWindowParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL 
       | LayoutParams.FLAG_NOT_FOCUSABLE; 
     smallWindowParams.gravity = Gravity.LEFT | Gravity.TOP; 
     smallWindowParams.width = SmallFloatWin.viewWidth; 
     smallWindowParams.height = SmallFloatWin.viewHeight; 
     smallWindowParams.x = screenWidth; 
     smallWindowParams.y = screenHeight / ; 
    } 
    mSmallFloatWin.setParams(smallWindowParams);
    windowManager.addView(mSmallFloatWin, smallWindowParams); 
   }