1    /**
 2      * 获得当前活动APP的包名
 3      * 
 4      * @return 返回当前活动界面是不是桌面
 5      */
 6     private boolean isHomeWin()
 7     {
 8         ActivityManager mActivityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
 9         List<RunningTaskInfo> lstRti = mActivityManager.getRunningTasks(1);
10         return getHomes().contains(lstRti.get(0).topActivity.getPackageName());
11     }
12     
13     
14     /**
15      * 获得属于桌面的应用的应用包名称
16      * 
17      * @return 返回包含所有包名的字符串列表
18      */
19     private List<String> getHomes() {
20         List<String> packages = new ArrayList<String>();
21         PackageManager packageManager = this.getPackageManager();
22         Intent intent = new Intent(Intent.ACTION_MAIN);
23         intent.addCategory(Intent.CATEGORY_HOME);
24         List<ResolveInfo> resolveInfo = packageManager.queryIntentActivities(intent,PackageManager.MATCH_DEFAULT_ONLY);
25         for (ResolveInfo ri : resolveInfo) {
26             packages.add(ri.activityInfo.packageName);
27         }
28         return packages;
29     }

 在浮动窗口开发中，经常要用到该判断，如果在桌面的时候才显示浮动窗口。