Google Paly V3 Initate Connect & Query Items

Initiate a Connection with Google Play

Creating a ServiceConnection

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Your application must have a ServiceConnection to facilitate messaging between your application and Google Play. At a minimum, your application must do the following:

• Bind to IInAppBillingService.
• Send billing requests (as IPC method calls) to the Google Play application.
• Handle the synchronous response messages that are returned with each billing request.

Binding to IInAppBillingService

To establish a connection with the In-app Billing service on Google Play, implement a ServiceConnection to bind your activity to IInAppBillingService. Override the onServiceDisconnected and onServiceConnectedmethods to get a reference to the IInAppBillingService instance after a connection has been established.

IInAppBillingService mService;ServiceConnection mServiceConn = new ServiceConnection() {   @Override   public void onServiceDisconnected(ComponentName name) {       mService = null;   }   @Override   public void onServiceConnected(ComponentName name,       IBinder service) {       mService = IInAppBillingService.Stub.asInterface(service);   }};

In your activity’s onCreate method, perform the binding by calling the bindService method. Pass the method anIntent that references the In-app Billing service and an instance of the ServiceConnection that you created.

@Overridepublic void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);            bindService(new         Intent("com.android.vending.billing.InAppBillingService.BIND"),                mServiceConn, Context.BIND_AUTO_CREATE);

1、

 create an IabHelper instance in your activity'sonCreate method. In the constructor, pass in the Context for the activity, along with a string containing the public license key that was generated earlier by the Google Play Developer Console.

IabHelper mHelper;@Overridepublic void onCreate(Bundle savedInstanceState) {   // ...   String base64EncodedPublicKey;      // compute your public key and store it in base64EncodedPublicKey   mHelper = new IabHelper(this, base64EncodedPublicKey);}

2、
Next, perform the service binding by calling the startSetup method on the IabHelper instance that you created. Pass the method an OnIabSetupFinishedListener instance, which is called once the IabHelper completes the asynchronous setup operation. As part of the setup process, the IabHelper also checks if the In-app Billing Version 3 API is supported by Google Play. If the API version is not supported, or if an error occured while establishing the service binding, the listener is notified and passed an IabResult object with the error message.
mHelper.startSetup(new IabHelper.OnIabSetupFinishedListener() {   public void onIabSetupFinished(IabResult result) {      if (!result.isSuccess()) {         // Oh noes, there was a problem.         Log.d(TAG, "Problem setting up In-app Billing: " + result);      }                     // Hooray, IAB is fully set up!     }});
Query Items Available for Purchase
1、You can query Google Play to programmatically retrieve details of the in-app products that are associated with your application (such as the product’s price, title, description, and type). This is useful, for example, when you want to display a listing of unowned items that are still available for purchase to users.
Note: When making the query, you will need to specify the product IDs for the products explicitly. You can manually find the product IDs from the Developer Console by opening the In-app Products tab for your application. The product IDs are listed under the column labeled Name/ID.
To retrieve the product details, call queryInventoryAsync(boolean, List, QueryInventoryFinishedListener) on your IabHelper instance.
The first input argument indicates whether product details should be retrieved (should be set to true).
The List argument consists of one or more product IDs (also called SKUs) for the products that you want to query.
Finally, the QueryInventoryFinishedListener argument specifies a listener is notified when the query operation has completed and handles the query response.
2、if you use the convenience classes provided in the sample, the classes will handle background thread management for In-app Billing requests, so you can safely make queries from the main thread of your application.
The following code shows how you can retrieve the details for two products with IDs SKU_APPLE and SKU_BANANAthat you previously defined in the Developer Console.
List additionalSkuList = new List();additionalSkuList.add(SKU_APPLE);additionalSkuList.add(SKU_BANANA);mHelper.queryInventoryAsync(true, additionalSkuList,   mQueryFinishedListener);