/** 
* 获得属于桌面的应用的应用包名称 
* @return 返回包含所有包名的字符串列表 
*/ 
private List<String> getHomes() { 
  List<String> names = new ArrayList<String>(); 
  PackageManager packageManager = this.getPackageManager(); 
  //属性 
  Intent intent = new Intent(Intent.ACTION_MAIN);
  intent.addCategory(Intent.CATEGORY_HOME); 
  List<ResolveInfo> resolveInfo = packageManager.queryIntentActivities(intent, 
    PackageManager.MATCH_DEFAULT_ONLY); 
  for(ResolveInfo ri : resolveInfo){ 
   names.add(ri.activityInfo.packageName); 
   Log.i("zhangyinfu PinyinIME.java", "packageName =" + ri.activityInfo.packageName);
  } 
  return names;
}

/** 
* 判断当前界面是否是桌面 
*/ 
public boolean isHome(){ 
  ActivityManager mActivityManager = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE); 
  List<RunningTaskInfo> rti = mActivityManager.getRunningTasks(1);
  List<String> strs = getHomes();
  if(strs != null && strs.size() > 0){
   return strs.contains(rti.get(0).topActivity.getPackageName());
  }else{
   return false;
  }
}