如何判斷是否得到"android.permission.PACKAGE_USAGE_STATS"許可權

AppOpsManager appOps = (AppOpsManager) context
        .getSystemService(Context.APP_OPS_SERVICE);
int mode = appOps.checkOpNoThrow("android:get_usage_stats", 
        android.os.Process.myUid(), context.getPackageName());
boolean granted = mode == AppOpsManager.MODE_ALLOWED;

原文連結:http://stackoverflow.com/questions/28921136/how-to-check-if-android-permission-package-usage-stats-permission-is-given