title: how to implement in-app purchase in my android application?
body: <p>How to implement in-app purchase in my android application??</p>
  
  <p>I referred</p>
  
  <p><a href="http://developer.android.com/guide/market/billing/billing_integrate.html#billing-service">http://developer.android.com/guide/market/billing/billing_integrate.html#billing-service</a></p>
  
  <p>this link but I don't understand Binding to the MarketBillingService step.</p>
  
  <p>please give me proper example..</p>