title: my android in-app purchase not working with error product could not be purchased
body: <p>i am developing android in-app application with static In-app Product ID: android. test. purchased that is working good and i also get 
  Toast message: Thank you.You item will be appear shortly.
  but in actual Product ID:com.android.example not working properly.and i don't know toast message class now i am what to do.
      <code>  </p>
  
  <pre>public void onCreate(Bundle savedInstanceState) 
  {
      super.onCreate(savedInstanceState);
      requestWindowFeature(Window.FEATURE_NO_TITLE);
      this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
  
      mainview=(ImageView)findViewById(R.id.comcontractsol);
  
      mBillingObserver = new AbstractBillingObserver(this) {
  
          @Override
          public void onBillingChecked(boolean supported) 
          {
              Dungeon.this.onBillingChecked(supported);
          }
  
          @Override
          public void onPurchaseStateChanged(String itemId, PurchaseState state) 
          {
  
              if(itemId.equals("android.test.purchased"))
              {       
                  mainview.setBackgroundResource(R.drawable.unlock);
                  Dungeon.this.onPurchaseStateChanged(itemId, state);
                  startActivity(new Intent(getApplicationContext(), secondActivity.class));
              }
          }
          @Override
          public void onRequestPurchaseResponse(String itemId, ResponseCode response) 
          {
              Dungeon.this.onRequestPurchaseResponse(itemId, response);
          }
      }
  </code></pre>