Example of how to use UsageStats in Android

UsageStatsExample.java

/**
 * AndroidManifest.xml
 *
 *  <uses-permission
 *      android:name="android.permission.PACKAGE_USAGE_STATS"
 *      tools:ignore="ProtectedPermissions" />
 */

/**
 * In your Class
 */

// Ask user for permission

Intent intent = new Intent(android.provider.Settings.ACTION_USAGE_ACCESS_SETTINGS);
startActivity(intent);

// Show stats

long startTime = new GregorianCalendar(2014, 0, 1).getTimeInMillis();
long endTime = new GregorianCalendar(2016, 0, 1).getTimeInMillis();

UsageStatsManager usageStatsManager = (UsageStatsManager)context.getSystemService(Context.USAGE_STATS_SERVICE);
List<UsageStats> queryUsageStats = usageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_DAILY, startTime, endTime);

for (UsageStats us : queryUsageStats) {
    Log.d(TAG, us.getPackageName() + " = " + us.getTotalTimeInForeground());
}