//判斷當前是不是桌面 public static Boolean isHome(Context context) {	String topPackageName = getTopActivityName(context);	//此處做了判斷如果得到的是null的話就返回一個true 	return topPackageName == null ? true : getHomesPackageName(context).contains(topPackageName);}//得到桌面的包名，包括第三方桌面 private static List<String> getHomesPackageName(Context context) {	List<String> homePackageNames = new ArrayList<>();	PackageManager packageManager = context.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 info : resolveInfo) {		homePackageNames.add(info.activityInfo.packageName);	}	return homePackageNames;}//得到棧頂Activity的名字，注意此處要進行判斷，Android在5.0以后Google把getRunningTasks的方法給屏蔽掉了，所以要分開處理 private static String getTopActivityName(Context context) {	String topActivityPackageName;	ActivityManager manager = (ActivityManager) context.getSystemService(context.ACTIVITY_SERVICE);	if (Build.VERSION.SDK_iNT >= Build.VERSION_CODES.LOLLIPOP) {		//此處要判斷用戶的安全權限有沒有打開，如果打開了就進行獲取棧頂Activity的名字的方法 		//當然，我們的要求是如果沒打開就不獲取了，要不然跳轉會影響用戶的體驗 		if (isSecurityPermissionOpen(context)) {			UsageStatsManager mUsageStatsManager = (UsageStatsManager) context.getSystemService(Context.USAGE_STATS_SERVICE);			long endTime = System.currentTimeMillis();			long beginTime = endTime - 1000 * 60 * 2;			UsageStats recentStats = null;			List<UsageStats> queryUsageStats = mUsageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_BEST, beginTime, endTime);			if (queryUsageStats == null || queryUsageStats.isEmpty()) {				return null;			}			for (UsageStats usageStats : queryUsageStats) {				if (recentStats == null || recentStats.getLastTimeUsed() < usageStats.getLastTimeUsed()) {					recentStats = usageStats;				}			}			topActivityPackageName = recentStats.getPackageName();			return topActivityPackageName;		} else {			return null;		}	} else {		List<ActivityManager.RunningTaskInfo> taskInfos = manager.getRunningTasks(1);		if (taskInfos.size() > 0) 		      topActivityPackageName = taskInfos.get(0).topActivity.getPackageName(); else 		      return null;		return topActivityPackageName;	}}//判斷用戶對應的安全權限有沒有打開 private static Boolean isSecurityPermissionOpen(Context context) {	long endTime = System.currentTimeMillis();	UsageStatsManager usageStatsManager = (UsageStatsManager) context.getApplicationContext().getSystemService("usagestats");	List<UsageStats> queryUsageStats = usageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_BEST, 0, endTime);	if (queryUsageStats == null || queryUsageStats.isEmpty()) {		return false;	}	return true;}//此處是跳轉安全權限的跳轉代碼，如果你判斷用戶沒有開啟權限的話可以選擇跳轉，此處標明~~~ //Intent intent = new Intent(Settings.ACTION_USAGE_ACCESS_SETTINGS); //startActivity(intent);