<Android - queryAndAggregateUsageStats returns emp...

# stackoverflow

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Android - queryAndAggregateUsageStats returns empty map
I am working on a requirement where I need to get the app usage every 15 mins. I am getting empty map. Please see below code. I guess INTERVAL_BEST interval type is not working for given timeframe. Any help will be appreciated. Thanks.
fun getAppsUsageMap() {
val manager: UsageStatsManager? = null
val calendar = Calendar.getInstance()
val startTime = calendar.timeInMillis;
calendar.add(Calendar.MINUTE, -15)
val endTime = calendar.timeInMillis;...