[android] how can I know whether an application is installed with packagename?

android, how can I know whether an application is installed with packagename?

public static boolean isAppInstalled( Context context, String packageName ){

  try{

    context.getPackageManager().getPackageInfo( packageName, PackageManager.GET_META_DATA );

    return true;

  }

  catch( Exception e ){

    return false;

  }

}

CONTEXT, how can i know whether an application is installed with packagename, install, isappinstalled, packageinfo, PackageManager, packageNameCONTEXT, how can i know whether an application is installed with packagename, install, isappinstalled, packageinfo, PackageManager, packageName