Android API to query is google market installed

boolean isMarketInstalled (){
Intent market = new Intent(Intent.ACTION_VIEW, Uri.parse("market://search?q=dummy"));
PackageManager manager = getPackageManager();
List<ResolveInfo> list = manager.queryIntentActivities(market, 0);
if(list.size() > 0)
return true;
else
return false;
}