android 检测该包名所对应的应用是否存在

/**   * 检测该包名所对应的应用是否存在   * @param packageName   * @return   */  public boolean checkPackage(String packageName)   {      if (packageName == null || "".equals(packageName))          return false;      try     {          getPackageManager().getApplicationInfo(packageName, PackageManager.GET_UNINSTALLED_PACKAGES);          return true;      }     catch (NameNotFoundException e)     {          return false;      }  }