How to check if “android.permission.PACKAGE_USAGE_STATS” permission is given?

Question

Background

I\'m trying to get app-launched statistics, and on Lollipop it\'s possible by using the UsageStatsManager class, as such (original post here):

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Answer 1

By our investigation: if MODE is default (MODE_DEFAULT), extra permission checking is needed. Thanks to Weien's examination effort.

boolean granted = false;
AppOpsManager appOps = (AppOpsManager) context
        .getSystemService(Context.APP_OPS_SERVICE);
int mode = appOps.checkOpNoThrow(AppOpsManager.OPSTR_GET_USAGE_STATS, 
        android.os.Process.myUid(), context.getPackageName());

if (mode == AppOpsManager.MODE_DEFAULT) {
    granted = (context.checkCallingOrSelfPermission(android.Manifest.permission.PACKAGE_USAGE_STATS) == PackageManager.PERMISSION_GRANTED);
} else {
    granted = (mode == AppOpsManager.MODE_ALLOWED);
}