in-app-billing for google play （google应用内付费 v3）

详细文档参考： https://developer.android.com/google/play/billing/billing_integrate.html#billing-add-aidl

        Google的In-app Billing, V3版本的接口是google发布的最新充值接口，支持以服务的形式异步的与Google Play进行交互，更加安全可靠，减少交易中的不确定因素造成的损失。 但是暂时只支持 In-app Products，不支持订阅。
       基本步骤如下：
将 IInAppBillingService.aidl文件拷贝到src文件夹下，正常的话会在gen目录下生成对应的.java文件
在AndroidManifest.xml 文件中添加如下权限 
<uses-permission android:name="com.android.vending.BILLING" />
创建一个 ServiceConnection  并将其与  IInAppBillingService绑定。这个是最核心的功能，用于与Google Play进行通信。详细代码参考IabHelper.java 核心代码如下：

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);   }};@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);@Overridepublic void onDestroy() {    super.onDestroy();    if (mServiceConn != null) {        unbindService(mServiceConn);    }}

一旦成功与Google Play建立连接，就可以使用上面创建的service与其进行通信。比如获取商品信息，发布购买请求等等。获取商品信息的代码示例(注意，不要在主线程调用此代码，涉及网络请求可能会阻塞主线程，应该另开一个线程调用)：

ArrayList skuList = new ArrayList();skuList.add("premiumUpgrade");skuList.add("gas");Bundle querySkus = new Bundle();querySkus.putStringArrayList(“ITEM_ID_LIST”, skuList);Bundle skuDetails = mService.getSkuDetails(3, getPackageName(), "inapp", querySkus);int response = skuDetails.getInt("RESPONSE_CODE");if (response == 0) {   ArrayList responseList       = skuDetails.getStringArrayList("DETAILS_LIST");      for (String thisResponse : responseList) {      JSONObject object = new JSONObject(thisResponse);      String sku = object.getString("productId");      String price = object.getString("price");      if (sku.equals("premiumUpgrade")) mPremiumUpgradePrice = price;      else if (sku.equals("gas")) mGasPrice = price;   }}

申请购买商品：

// 购买代码Bundle buyIntentBundle = mService.getBuyIntent(3, getPackageName(),   sku, "inapp", "bGoa+V7g/yqDXvKRqq+JTFn4uQZbPiQJo4pf9RzJ");PendingIntent pendingIntent = buyIntentBundle.getParcelable("BUY_INTENT");startIntentSenderForResult(pendingIntent.getIntentSender(),   1001, new Intent(), Integer.valueOf(0), Integer.valueOf(0),   Integer.valueOf(0));// 结果返回Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {   if (requestCode == 1001) {          int responseCode = data.getIntExtra("RESPONSE_CODE", 0);      String purchaseData = data.getStringExtra("INAPP_PURCHASE_DATA");      String dataSignature = data.getStringExtra("INAPP_DATA_SIGNATURE");              if (resultCode == RESULT_OK) {         try {            JSONObject jo = new JSONObject(purchaseData);            String sku = jo.getString("productId");            alert("You have bought the " + sku + ". Excellent choice,                adventurer!");          }          catch (JSONException e) {             alert("Failed to parse purchase data.");             e.printStackTrace();          }      }   }}// 返回结果示例'{    "orderId":"12999763169054705758.1371079406387615",    "packageName":"com.example.app",   "productId":"exampleSku",   "purchaseTime":1345678900000,   "purchaseState":0,   "developerPayload":"bGoa+V7g/yqDXvKRqq+JTFn4uQZbPiQJo4pf9RzJ",   "purchaseToken":"rojeslcdyyiapnqcynkjyyjh" }'

设置物品已消耗（默认情况下，物品一旦被购买就属于用户，不允许再次被购买，如果是消耗型商品，比如货币或者装备，就需要向Google Play发送信息通知该物品已被消耗。注意，这个步骤要在真正提供商品之前进行，之后正确的获取到返回值才提供商品给玩家。）
int response = mService.consumePurchase(3, getPackageName(), token);

Handle In-app Billing responses from Google Play.

调试不成功报错：Error checking for billing v3 support. (response: 3:Billing Unavailable)

参考：http://zengrong.net/post/1801.htm