android 判断当前界面是否是桌面

 1    /**
     * 获得当前活动APP的包名
     * 
     * @return 返回当前活动界面是不是桌面
     */
    private boolean isHomeWin()
    {
        ActivityManager mActivityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningTaskInfo> lstRti = mActivityManager.getRunningTasks(1);
        return getHomes().contains(lstRti.get(0).topActivity.getPackageName());
    }
    
    
    /**
     * 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> packages = new ArrayList<String>();
        PackageManager packageManager = this.getPackageManager();
        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) {
            packages.add(ri.activityInfo.packageName);
        }
        return packages;
    }

 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。