Get (real) foreground process using activityManager.getRunningAppProcesses()

What is the correct method to get current foreground process and prevent false positives?

UsageStatsManager is the only official API to get the current running app (see #50).

Using getRunningTasks(int maxNum), getRunningAppProcesses() or AccessibilityService to get the foreground app has never been reliable. The documentation for the first two methods has the following warning: Note: this method is only intended for debugging

Below is an example for getting the top app using UsageStatsManager:

java

Calendar endCal = Calendar.getInstance();
Calendar beginCal = Calendar.getInstance();
beginCal.add(Calendar.MINUTE, -30);
UsageStatsManager manager = (UsageStatsManager) getSystemService(Context.USAGE_STATS_SERVICE);
List<UsageStats> stats =  manager.queryUsageStats(UsageStatsManager.INTERVAL_DAILY,  
    beginCal.getTimeInMillis(), endCal.getTimeInMillis());
Collections.sort(stats, new Comparator<UsageStats>() {

  @Override public int compare(UsageStats lhs, UsageStats rhs) {
    long time1 = lhs.getLastTimeUsed();
    long time2 = rhs.getLastTimeUsed();
    if (time1 > time2) {
      return -1;
    } else if (time1 < time2) {
      return 1;
    }
    return 0;
  }
});
// The first "UsageStats" in the list will be the top application.
// If the list is empty you will need to ask for permissions to use UsageStatsManager
// To request permission:
// startActivity(new Intent(Settings.ACTION_USAGE_ACCESS_SETTINGS));

I know this isn't the answer you are hoping for. Apps like CM Security and AppLock use UsageStatsManager on Android 5.1.1+. Due to SeLinux, it is impossible to get the foreground app using getRunningTasks(int maxNum) or getRunningAppProcesses().