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<uses-permission android:name="android.permission.GET_TASKS" />

static boolean isAppRunning(Context context) {
    ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<ActivityManager.RunningTaskInfo> list = null;
    if (activityManager != null) {
        list = activityManager.getRunningTasks(100);
    }
    if (list == null || list.size() <= 0) {
        return false;
    }
    for (ActivityManager.RunningTaskInfo info : list) {
        if (info.baseActivity.getPackageName().equals(context.getPackageName())) {
            return true;
        }
    }
    return false;
}

2.判断是否在前台

private static boolean isAppForeground(Context context) {
    if (context != null) {
        ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningAppProcessInfo> processes;
        if (activityManager != null) {
            processes = activityManager.getRunningAppProcesses();
        } else {
            return false;
        }
        for (ActivityManager.RunningAppProcessInfo processInfo : processes) {
            if (processInfo.processName.equals(context.getPackageName())) {
                MLog.i(FaceDetectionApp.TAG, "processInfo.importance = " + processInfo.importance);
                if (processInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
                    return true;
                }
            }
        }
    }
    return false;
}

3.判断是否在后台

通过1和2 可以判断后台