判断应用程序是否在前台#61
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getRunningTasks 在 API 21 已被遗弃，已经不能正常获取。通过 getRunningAppProcesses ，仅可以获取自己应用的包名，其他应用不能获取，所以只能判断应用是否处于前台，而不能判断前台应用是哪个。系统应用可通过 UsageStatsManager 来获取前台应用包名。
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👍 @Blankj |
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既然只能判断自己应用，那就不要packageName参数那个了 |
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getRunningTasks 在 API 21 已被遗弃，已经不能正常获取。通过 getRunningAppProcesses ，仅可以获取自己应用的包名，其他应用不能获取，所以只能判断应用是否处于前台，而不能判断前台应用是哪个。系统应用可通过 UsageStatsManager 来获取前台应用包名。