http://www.bubuko.com/infodetail-930440.html

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如billing開發文檔所說，要在你的應用中實現In-app?Billing只需要完成以下幾步就可以了。??

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第一,把你上篇下載的AIDL文件添加到你的工程里，第二,把??

<uses-permission android:name="com.android.vending.BILLING" />

這個權限加到你工程的AndroidManifest.xml文件中，第三，創建一個ServiceConnection,并把它綁定到IInAppBillingService中。完成上面三條后就可以使用支付了。當然這只是一個簡單的介紹。其實Google的這個支付，大部分都是你手機上的Google Play來進行處理的，你只需要處理購買請求，處理購買結果就行了。文檔寫的很好，先把這個文檔看完，就知道支付流程了。

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正文:

1.內購商品相關

針對我的項目而言，我們在Google后臺設置的是受管理可消耗的商品("managed per user account")，具體的就是游戲里的水晶，玩家可以多次購買。但是Google后臺的這種可重復購買商品（還有一種是只能購買一次的商品"subscription"）有個要求，就是你購買成功后需要主動向Google Play請求消耗這個商品，等消耗成功后你才可以再次下單購買。因此，在游戲里的支付會多出一個操作步驟就是請求消耗購買成功的商品。

2.檢測設備是否支持Google Play Service

在正式開啟支付前，Google billing會檢查你的手機是否支持Google billing，這個下面會講到。為了更好的用戶體驗，建議在Google billing檢測之前，可以先檢測一下用戶的設備是否支持Google Play Service，其中基本要求就是安裝了Google Play應用商店和Google Play Service。如果用戶的設備不具備這兩個，就可以彈出提示引導用戶去安裝。這里有兩種方式可以用，一種是通過Google Play Service來進行檢測，就是上篇下載的那個Service擴展包，一種是自己寫代碼，遍歷設備上安裝的應用程序，檢查是否有安裝Google Play。先說第一種。

(1)Google Play Service

上篇下載的Service包里會有一個庫工程

把這個庫工程導入你的eclipse,引用到你的工程里就可以用了，具體操作可以參加docs下的文檔，so easy!導入成功后，調用其中的一個方法就可以了。

/*** Check the device to make sure it has the Google Play Services APK.If* it doesn‘t, display a dialog that allows users to download the APK from* the Google Play Store or enable it in the device‘s system settings*/private boolean checkPlayServices(){int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);if(resultCode != ConnectionResult.SUCCESS){if(GooglePlayServicesUtil.isUserRecoverableError(resultCode)){GooglePlayServicesUtil.getErrorDialog(resultCode, this,PLAY_SERVICES_RESOLUTION_REQUEST).show();}else{Log.i(TAG, "This device is not supported");finish();}return false;}return true;}

如果當前設備的Google Service不可用，就會彈出提示，引導用戶去設置安裝。如果此設備不支持的話，就也不需要檢測Google billing是否可用了。多說一句，Google Play Service可以做很多事的，如果覺得只用上面的功能太簡單的話，就可以考慮把應用自動更新也加上，當你在Google Play上傳了新版程序后，Google Play會幫你提示用戶更新程序。還有一個比較好玩的就是如果引入了這個庫工程后，就可以加GCM了(Google Cloud Messaging),就是消息推送推送功能，當然這個比較麻煩，有興趣的可以去加加看。

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(2)遍歷包名

Google Play的程序包名是"com.Android.vending",運行在設備上的Google Play Service的包名是"com.google.android.gms"，可以在程序啟動的時候遍歷下設備上的包名，如果沒有這兩個東西就引導用戶去安裝。

遍歷包名方法

//Check Google Playprotected boolean isHaveGooglePlay(Context context, String packageName){//Get PackageManagerfinal PackageManager packageManager = context.getPackageManager();//Get The All Install App Package NameList<PackageInfo> pInfo = packageManager.getInstalledPackages(0);//Create Name ListList<String> pName = new ArrayList<String>();//Add Package Name into Name Listif(pInfo != null){for(int i=0; i<pInfo.size(); i++){String pn = pInfo.get(i).packageName;pName.add(pn);//Log.v("Package Name", "PackAgeName: = " + pn);}}//Check return pName.contains(packageName);}

提示安裝方法

Uri uri = Uri.parse("market://details?id=" + "要安裝程序的包名");Intent it = new Intent(Intent.ACTION_VIEW, uri); startActivity(it);

?上面這個方法會打開你手機上的應用商店，定位到要安裝的程序。

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不過還是推薦用Google Play Service來檢測，貌似第二種，即使有的用戶裝了Google Play(像國內用戶)，也不支持Google Play Service的。

3.添加代碼(終于要加支付代碼了)

把上篇下載的samples里util的代碼全部拷到你的工程里，可以新建一個包，放到里面。

這個說明一下，其實這個例子的代碼還是不錯的，本著天下代碼一大抄和拿來主義，就直接拿來用吧！當然如果你覺得這個代碼寫的不好，或者不適用你的工程，你就可以依據文檔自己寫適用的代碼。當然文檔里說過，為了防止別人破解你的游戲，最好把里面的變量和方法都改下名字，畢竟這里的代碼任何人都看得到。我的做法是照搬過來了，只是把IabHelper.Java改造了下，因為這個是整個支付的關鍵，其他都是輔助的，可以不管。

把這里的代碼拷完，把該import的都import了，你就可以照samples中的代碼開寫自己的支付了。針對單機游戲，就需要考慮這個代碼改造和本地的驗證，加密了。針對網絡游戲就要簡單了。因為我其實對java不太熟悉，所以單機的加密,base驗證，混淆什么的就不做介紹了。下面主要說網絡游戲。

(1)IabHelper.java

這個是支付的關鍵代碼，其中已經把設置billing,商品查詢，商品購買，商品回調，商品驗證以及回調方法都寫好了，你直接參照samples用就可以了。

01.設置billing

就是開篇所說的綁定ServiceConnection到IInAppBillingService。功能很完善，包括成功和失敗都有回調，還有各種異常。在你程序的啟動Activity里檢測完設備是否Google Play Service后，就可以new一個IabHelper，來調用這個方法，根據不同的回調里做相應的處理。

/*** Starts the setup process. This will start up the setup process asynchronously.* You will be notified through the listener when the setup process is complete.* This method is safe to call from a UI thread.** @param listener The listener to notify when the setup process is complete.*/public void startSetup(final OnIabSetupFinishedListener listener) {// If already set up, can‘t do it again.checkNotDisposed();if (mSetupDone) throw new IllegalStateException("IAB helper is already set up.");// Connection to IAB servicelogDebug("Starting in-app billing setup.");mServiceConn = new ServiceConnection() {@Overridepublic void onServiceDisconnected(ComponentName name) {logDebug("Billing service disconnected.");mService = null;}@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {if (mDisposed) return;logDebug("Billing service connected.");mService = IInAppBillingService.Stub.asInterface(service);String packageName = mContext.getPackageName();try {logDebug("Checking for in-app billing 3 support.");// check for in-app billing v3 supportint response = mService.isBillingSupported(3, packageName, ITEM_TYPE_INAPP);if (response != BILLING_RESPONSE_RESULT_OK) {if (listener != null) listener.onIabSetupFinished(new IabResult(response,"Error checking for billing v3 support."));// if in-app purchases aren‘t supported, neither are subscriptions.mSubscriptionsSupported = false;return;}logDebug("In-app billing version 3 supported for " + packageName);// check for v3 subscriptions supportresponse = mService.isBillingSupported(3, packageName, ITEM_TYPE_SUBS);if (response == BILLING_RESPONSE_RESULT_OK) {logDebug("Subscriptions AVAILABLE.");mSubscriptionsSupported = true;}else {logDebug("Subscriptions NOT AVAILABLE. Response: " + response);}mSetupDone = true;}catch (RemoteException e) {if (listener != null) {listener.onIabSetupFinished(new IabResult(IABHELPER_REMOTE_EXCEPTION,"RemoteException while setting up in-app billing."));}e.printStackTrace();return;}if (listener != null) {listener.onIabSetupFinished(new IabResult(BILLING_RESPONSE_RESULT_OK, "Setup successful."));}}};Intent serviceIntent = new Intent("com.android.vending.billing.InAppBillingService.BIND");serviceIntent.setPackage("com.android.vending");if (!mContext.getPackageManager().queryIntentServices(serviceIntent, 0).isEmpty()) {// service available to handle that IntentmContext.bindService(serviceIntent, mServiceConn, Context.BIND_AUTO_CREATE);}else {// no service available to handle that Intentif (listener != null) {listener.onIabSetupFinished(new IabResult(BILLING_RESPONSE_RESULT_BILLING_UNAVAILABLE,"Billing service unavailable on device."));}}} [html]?view plaincopy

samples中的代碼??

// Create the helper, passing it our context and the public key to verify signatures withLog.d(TAG, "Creating IAB helper.");mHelper = new IabHelper(this, base64EncodedPublicKey);// enable debug logging (for a production application, you should set this to false).mHelper.enableDebugLogging(true);// Start setup. This is asynchronous and the specified listener// will be called once setup completes.Log.d(TAG, "Starting setup.");mHelper.startSetup(new IabHelper.OnIabSetupFinishedListener() {public void onIabSetupFinished(IabResult result) {Log.d(TAG, "Setup finished.");if (!result.isSuccess()) {// Oh noes, there was a problem.complain("Problem setting up in-app billing: " + result);return;}// Have we been disposed of in the meantime? If so, quit.if (mHelper == null) return;// IAB is fully set up. Now, let‘s get an inventory of stuff we own.Log.d(TAG, "Setup successful. Querying inventory.");mHelper.queryInventoryAsync(mGotInventoryListener);}});}

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02.查詢商品

在setup方法的最后有一個

mHelper.queryInventoryAsync(mGotInventoryListener);

是用來查詢你目前擁有的商品的。其中的回調的代碼如下

// Listener that‘s called when we finish querying the items and subscriptions we ownIabHelper.QueryInventoryFinishedListener mGotInventoryListener = new IabHelper.QueryInventoryFinishedListener() {public void onQueryInventoryFinished(IabResult result, Inventory inventory) {Log.d(TAG, "Query inventory finished.");// Have we been disposed of in the meantime? If so, quit.if (mHelper == null) return;// Is it a failure?if (result.isFailure()) {complain("Failed to query inventory: " + result);return;}Log.d(TAG, "Query inventory was successful.");/** Check for items we own. Notice that for each purchase, we check* the developer payload to see if it‘s correct! See* verifyDeveloperPayload().*/// Do we have the premium upgrade?Purchase premiumPurchase = inventory.getPurchase(SKU_PREMIUM);mIsPremium = (premiumPurchase != null && verifyDeveloperPayload(premiumPurchase));Log.d(TAG, "User is " + (mIsPremium ? "PREMIUM" : "NOT PREMIUM"));// Do we have the infinite gas plan?Purchase infiniteGasPurchase = inventory.getPurchase(SKU_INFINITE_GAS);mSubscribedToInfiniteGas = (infiniteGasPurchase != null &&verifyDeveloperPayload(infiniteGasPurchase));Log.d(TAG, "User " + (mSubscribedToInfiniteGas ? "HAS" : "DOES NOT HAVE")+ " infinite gas subscription.");if (mSubscribedToInfiniteGas) mTank = TANK_MAX;// Check for gas delivery -- if we own gas, we should fill up the tank immediatelyPurchase gasPurchase = inventory.getPurchase(SKU_GAS);if (gasPurchase != null && verifyDeveloperPayload(gasPurchase)) {Log.d(TAG, "We have gas. Consuming it.");mHelper.consumeAsync(inventory.getPurchase(SKU_GAS), mConsumeFinishedListener);return;}updateUi();setWaitScreen(false);Log.d(TAG, "Initial inventory query finished; enabling main UI.");}};

因為目前我們的內購商品是可重復購買的，所以在成功查詢到我們已經購買的商品后進行了消耗商品操作。消耗的代碼在這里

// Check for gas delivery -- if we own gas, we should fill up the tank immediatelyPurchase gasPurchase = inventory.getPurchase(SKU_GAS);if (gasPurchase != null && verifyDeveloperPayload(gasPurchase)) {Log.d(TAG, "We have gas. Consuming it.");mHelper.consumeAsync(inventory.getPurchase(SKU_GAS), mConsumeFinishedListener);return;}

在講消耗前，先解釋下以上這么操作的原因。在內購商品那里講過，如果是設置的是可重復商品，當你在成功購買這個商品后是需要主動消耗的，只有消耗成功后才可以再次購買。可能有些人覺得這種設定不好，我的商品本來就是可重復購買的，為什么還要在買成功后通知Google Play消耗掉商品呢(可能本身商品沒用消耗掉，這只是一種叫法)？我個人覺得這樣設定，第一，可以避免用戶重復下單購買，第二，可以保證每筆消費訂單的唯一。有了以上兩點就可以很好地處理漏單。 so,上面代碼在成功設置billing后，第一個操作就是查詢擁有的商品，就是做的漏單處理。因為支付過程其實就是你的應用程序----->Google Play程序(通過Google Play Service)------>Google服務器------->Google Play程序(通過Google Play Service)------>你的應用程序。這樣一個交互過程，還需要網絡支持，所以每次支付操作不會保證百分百成功，這樣就會產生漏單現象，就是用戶付費成功了，但是Google Play在通知你的應用程序支付結果時，因為某些原因斷掉了，這樣你的程序就不知道支付是否操作成功了，so,只好在下次進游戲時查查有沒有已經購買的，但是還沒有消耗的商品，有的話就消耗掉，然后再把商品發送給用戶。因為這個商品在消耗之前，用戶是無法再次購買的，所以單個用戶就只會對應單一的漏單，不會有重復的漏單。這些信息都是存到Google服務器上的，直接調代碼里的查詢代碼就可以了。

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02.消耗商品

消耗商品會在兩個地方出現。一，查詢商品中所說的漏單中，二，就是你每次購買成功后的消耗。消耗商品也有一個回調，如下

// Called when consumption is completeIabHelper.OnConsumeFinishedListener mConsumeFinishedListener = new IabHelper.OnConsumeFinishedListener() {public void onConsumeFinished(Purchase purchase, IabResult result) {Log.d(TAG, "Consumption finished. Purchase: " + purchase + ", result: " + result);// if we were disposed of in the meantime, quit.if (mHelper == null) return;// We know this is the "gas" sku because it‘s the only one we consume,// so we don‘t check which sku was consumed. If you have more than one// sku, you probably should check...if (result.isSuccess()) {// successfully consumed, so we apply the effects of the item in our// game world‘s logic, which in our case means filling the gas tank a bitLog.d(TAG, "Consumption successful. Provisioning.");mTank = mTank == TANK_MAX ? TANK_MAX : mTank + 1;saveData();alert("You filled 1/4 tank. Your tank is now " + String.valueOf(mTank) + "/4 full!");}else {complain("Error while consuming: " + result);}updateUi();setWaitScreen(false);Log.d(TAG, "End consumption flow.");}};

代碼比較簡單，針對自己的游戲邏輯，在里面稍做改動即可。

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03.購買商品

按重要程度，購買商品應該排在第一位的，只是按支付流程走的話，購買商品卻不是第一位，這里就根據支付流程來走吧。

/*** Initiate the UI flow for an in-app purchase. Call this method to initiate an in-app purchase,* which will involve bringing up the Google Play screen. The calling activity will be paused while* the user interacts with Google Play, and the result will be delivered via the activity‘s* {@link android.app.Activity#onActivityResult} method, at which point you must call* this object‘s {@link #handleActivityResult} method to continue the purchase flow. This method* MUST be called from the UI thread of the Activity.** @param act The calling activity.* @param sku The sku of the item to purchase.* @param itemType indicates if it‘s a product or a subscription (ITEM_TYPE_INAPP or ITEM_TYPE_SUBS)* @param requestCode A request code (to differentiate from other responses --* as in {@link android.app.Activity#startActivityForResult}).* @param listener The listener to notify when the purchase process finishes* @param extraData Extra data (developer payload), which will be returned with the purchase data* when the purchase completes. This extra data will be permanently bound to that purchase* and will always be returned when the purchase is queried.*/public void launchPurchaseFlow(Activity act, String sku, String itemType, int requestCode,OnIabPurchaseFinishedListener listener, String extraData) {checkNotDisposed();checkSetupDone("launchPurchaseFlow");flagStartAsync("launchPurchaseFlow");IabResult result;if (itemType.equals(ITEM_TYPE_SUBS) && !mSubscriptionsSupported) {IabResult r = new IabResult(IABHELPER_SUBSCRIPTIONS_NOT_AVAILABLE,"Subscriptions are not available.");flagEndAsync();if (listener != null) listener.onIabPurchaseFinished(r, null);return;}try {logDebug("Constructing buy intent for " + sku + ", item type: " + itemType);Bundle buyIntentBundle = mService.getBuyIntent(3, mContext.getPackageName(), sku, itemType, extraData);int response = getResponseCodeFromBundle(buyIntentBundle);if (response != BILLING_RESPONSE_RESULT_OK) {logError("Unable to buy item, Error response: " + getResponseDesc(response));flagEndAsync();result = new IabResult(response, "Unable to buy item");if (listener != null) listener.onIabPurchaseFinished(result, null);return;}PendingIntent pendingIntent = buyIntentBundle.getParcelable(RESPONSE_BUY_INTENT);logDebug("Launching buy intent for " + sku + ". Request code: " + requestCode);mRequestCode = requestCode;mPurchaseListener = listener;mPurchasingItemType = itemType;act.startIntentSenderForResult(pendingIntent.getIntentSender(),requestCode, new Intent(),Integer.valueOf(0), Integer.valueOf(0),Integer.valueOf(0));}catch (SendIntentException e) {logError("SendIntentException while launching purchase flow for sku " + sku);e.printStackTrace();flagEndAsync();result = new IabResult(IABHELPER_SEND_INTENT_FAILED, "Failed to send intent.");if (listener != null) listener.onIabPurchaseFinished(result, null);}catch (RemoteException e) {logError("RemoteException while launching purchase flow for sku " + sku);e.printStackTrace();flagEndAsync();result = new IabResult(IABHELPER_REMOTE_EXCEPTION, "Remote exception while starting purchase flow");if (listener != null) listener.onIabPurchaseFinished(result, null);}}

以上是IabHelper中的支付購買代碼，其中包括了重復購買商品類型和一次購買商品類型的處理。主要的代碼是try里面的這一塊

try {logDebug("Constructing buy intent for " + sku + ", item type: " + itemType);Bundle buyIntentBundle = mService.getBuyIntent(3, mContext.getPackageName(), sku, itemType, extraData);int response = getResponseCodeFromBundle(buyIntentBundle);if (response != BILLING_RESPONSE_RESULT_OK) {logError("Unable to buy item, Error response: " + getResponseDesc(response));flagEndAsync();result = new IabResult(response, "Unable to buy item");if (listener != null) listener.onIabPurchaseFinished(result, null);return;}PendingIntent pendingIntent = buyIntentBundle.getParcelable(RESPONSE_BUY_INTENT);logDebug("Launching buy intent for " + sku + ". Request code: " + requestCode);mRequestCode = requestCode;mPurchaseListener = listener;mPurchasingItemType = itemType;act.startIntentSenderForResult(pendingIntent.getIntentSender(),requestCode, new Intent(),Integer.valueOf(0), Integer.valueOf(0),Integer.valueOf(0));} [html]?view plaincopy

<br?style="padding:?0px;"?/>一，調用In-app?Billing中的getBuyIntent方法，會傳幾個參數，第一個參數?3?代表的是當前所用的支付API的版本，第二個參數是你的包名，第三個參數就是你內購商品的ID,第四個參數是這次購買的類型，“inapp”和"subs",我們用的是第一個，第二個是只能購買一次的類型，第五個參數是訂單號。需要講的只有第三個和第五個參數。??

第三個參數，商品Id，就是你在Google開發者后臺上設置的內購商品的名字。每個商品的名字要唯一。推薦用商品名字加下劃線加價格的組合，比如"crystal_0.99",這樣你一看名字就知道這個商品的價格是0.99美金，商品是水晶。

第三個參數，訂單號。如果本地有支付服務器的話，這個訂單號可以由支付服務器生成，然后再傳給客戶端，這樣的話本地服務器也可以記錄下訂單信息，方便以后的查詢和操作。訂單號的格式推薦用時間戳加商品名字和價格，這樣也可以容易看出訂單信息。這個訂單號會傳給Google，購買成功后Google會原樣傳給你，所以也可以在其中加個標示信息，可以做下比對。

二，在getBuyIntent成功后，返回的Bundle中會有個BILLING_RESPONSE_RESULT_OK返回碼，這就代表成功了。然后再用這個Bundle得到一個PendingIntent.如上面代碼演示。

三，進行支付

act.startIntentSenderForResult(pendingIntent.getIntentSender(),requestCode, new Intent(),Integer.valueOf(0), Integer.valueOf(0),Integer.valueOf(0));

?這個方法是Activity中的一個方法，調用這個方法后，回有一個回調來接收結果。除了第一個PengdingIntent參數外，其他的可以按參數類型隨便寫。

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四，支付完成

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/*** Handles an activity result that‘s part of the purchase flow in in-app billing. If you* are calling {@link #launchPurchaseFlow}, then you must call this method from your* Activity‘s {@link android.app.Activity@onActivityResult} method. This method* MUST be called from the UI thread of the Activity.** @param requestCode The requestCode as you received it.* @param resultCode The resultCode as you received it.* @param data The data (Intent) as you received it.* @return Returns true if the result was related to a purchase flow and was handled;* false if the result was not related to a purchase, in which case you should* handle it normally.*/public boolean handleActivityResult(int requestCode, int resultCode, Intent data) {IabResult result;if (requestCode != mRequestCode) return false;checkNotDisposed();checkSetupDone("handleActivityResult");// end of async purchase operation that started on launchPurchaseFlowflagEndAsync();if (data == null) {logError("Null data in IAB activity result.");result = new IabResult(IABHELPER_BAD_RESPONSE, "Null data in IAB result");if (mPurchaseListener != null) mPurchaseListener.onIabPurchaseFinished(result, null);return true;}int responseCode = getResponseCodeFromIntent(data);String purchaseData = data.getStringExtra(RESPONSE_INAPP_PURCHASE_DATA);String dataSignature = data.getStringExtra(RESPONSE_INAPP_SIGNATURE);if (resultCode == Activity.RESULT_OK && responseCode == BILLING_RESPONSE_RESULT_OK) {logDebug("Successful resultcode from purchase activity.");logDebug("Purchase data: " + purchaseData);logDebug("Data signature: " + dataSignature);logDebug("Extras: " + data.getExtras());logDebug("Expected item type: " + mPurchasingItemType);if (purchaseData == null || dataSignature == null) {logError("BUG: either purchaseData or dataSignature is null.");logDebug("Extras: " + data.getExtras().toString());result = new IabResult(IABHELPER_UNKNOWN_ERROR, "IAB returned null purchaseData or dataSignature");if (mPurchaseListener != null) mPurchaseListener.onIabPurchaseFinished(result, null);return true;}Purchase purchase = null;try {purchase = new Purchase(mPurchasingItemType, purchaseData, dataSignature);String sku = purchase.getSku();// Verify signatureif (!Security.verifyPurchase(mSignatureBase64, purchaseData, dataSignature)) {logError("Purchase signature verification FAILED for sku " + sku);result = new IabResult(IABHELPER_VERIFICATION_FAILED, "Signature verification failed for sku " + sku);if (mPurchaseListener != null) mPurchaseListener.onIabPurchaseFinished(result, purchase);return true;}logDebug("Purchase signature successfully verified.");}catch (JSONException e) {logError("Failed to parse purchase data.");e.printStackTrace();result = new IabResult(IABHELPER_BAD_RESPONSE, "Failed to parse purchase data.");if (mPurchaseListener != null) mPurchaseListener.onIabPurchaseFinished(result, null);return true;}if (mPurchaseListener != null) {mPurchaseListener.onIabPurchaseFinished(new IabResult(BILLING_RESPONSE_RESULT_OK, "Success"), purchase);}}else if (resultCode == Activity.RESULT_OK) {// result code was OK, but in-app billing response was not OK.logDebug("Result code was OK but in-app billing response was not OK: " + getResponseDesc(responseCode));if (mPurchaseListener != null) {result = new IabResult(responseCode, "Problem purchashing item.");mPurchaseListener.onIabPurchaseFinished(result, null);}}else if (resultCode == Activity.RESULT_CANCELED) {logDebug("Purchase canceled - Response: " + getResponseDesc(responseCode));result = new IabResult(IABHELPER_USER_CANCELLED, "User canceled.");if (mPurchaseListener != null) mPurchaseListener.onIabPurchaseFinished(result, null);}else {logError("Purchase failed. Result code: " + Integer.toString(resultCode)+ ". Response: " + getResponseDesc(responseCode));result = new IabResult(IABHELPER_UNKNOWN_PURCHASE_RESPONSE, "Unknown purchase response.");if (mPurchaseListener != null) mPurchaseListener.onIabPurchaseFinished(result, null);}return true;}public Inventory queryInventory(boolean querySkuDetails, List<String> moreSkus) throws IabException {return queryInventory(querySkuDetails, moreSkus, null);}

支付結果返回后會調用上面這個方法，對于支付失敗和其中的錯誤，代碼寫的很清楚，可以自行處理。現在來關注支付成功后的結果驗證。在上面方法中會從支付結果的數據中取得兩個json數據。

int responseCode = getResponseCodeFromIntent(data);String purchaseData = data.getStringExtra(RESPONSE_INAPP_PURCHASE_DATA);String dataSignature = data.getStringExtra(RESPONSE_INAPP_SIGNATURE);

就是purchaseData和dataSignature。驗證支付就是需要這兩個參數和publicKey,例子里的驗證方法是寫在Security.java里的。里面寫了三個方法來完成支付結果的驗證。

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對于有本地支付服務器的游戲來說，這個操作就可以放到服務端了，客戶端只需要把purchaseData和dataSignature傳給支付服務器即可。然后有支付服務器把驗證結果傳給客戶端，再做成功和失敗的處理。成功后則要進行消耗商品的操作。對于沒有支付服務器的游戲來說，我個人覺得本地的操作要達到安全，還是比較難的。不過對于服務器驗證支付結果，也是存在風險的，只是風險要小。

/*** Verifies that the data was signed with the given signature, and returns* the verified purchase. The data is in JSON format and signed* with a private key. The data also contains the {@link PurchaseState}* and product ID of the purchase.* @param base64PublicKey the base64-encoded public key to use for verifying.* @param signedData the signed JSON string (signed, not encrypted)* @param signature the signature for the data, signed with the private key*/public static boolean verifyPurchase(String base64PublicKey, String signedData, String signature) {if (TextUtils.isEmpty(signedData) || TextUtils.isEmpty(base64PublicKey) ||TextUtils.isEmpty(signature)) {Log.e(TAG, "Purchase verification failed: missing data.");return false;}PublicKey key = Security.generatePublicKey(base64PublicKey);return Security.verify(key, signedData, signature);}/*** Generates a PublicKey instance from a string containing the* Base64-encoded public key.** @param encodedPublicKey Base64-encoded public key* @throws IllegalArgumentException if encodedPublicKey is invalid*/public static PublicKey generatePublicKey(String encodedPublicKey) {try {byte[] decodedKey = Base64.decode(encodedPublicKey);KeyFactory keyFactory = KeyFactory.getInstance(KEY_FACTORY_ALGORITHM);return keyFactory.generatePublic(new X509EncodedKeySpec(decodedKey));} catch (NoSuchAlgorithmException e) {throw new RuntimeException(e);} catch (InvalidKeySpecException e) {Log.e(TAG, "Invalid key specification.");throw new IllegalArgumentException(e);} catch (Base64DecoderException e) {Log.e(TAG, "Base64 decoding failed.");throw new IllegalArgumentException(e);}}/*** Verifies that the signature from the server matches the computed* signature on the data. Returns true if the data is correctly signed.** @param publicKey public key associated with the developer account* @param signedData signed data from server* @param signature server signature* @return true if the data and signature match*/public static boolean verify(PublicKey publicKey, String signedData, String signature) {Signature sig;try {sig = Signature.getInstance(SIGNATURE_ALGORITHM);sig.initVerify(publicKey);sig.update(signedData.getBytes());if (!sig.verify(Base64.decode(signature))) {Log.e(TAG, "Signature verification failed.");return false;}return true;} catch (NoSuchAlgorithmException e) {Log.e(TAG, "NoSuchAlgorithmException.");} catch (InvalidKeyException e) {Log.e(TAG, "Invalid key specification.");} catch (SignatureException e) {Log.e(TAG, "Signature exception.");} catch (Base64DecoderException e) {Log.e(TAG, "Base64 decoding failed.");}return false;}

PublicKey:

這個PublicKey是用來驗證支付結果的，所以這絕對是個Key，不可以讓其他人知道的，這個Key放到支付服務器端，本地不存。

samples里的這段代碼寫的很有意思，能看出笑點不？

單機游戲的話，想辦法把這個key存到某個地方加個密什么的，最好不要直接寫到代碼里。（其實對于單機游戲，如果沒有自己的服務器來驗證支付結果，本地不管如何操作，都是很容易被破解的，如果游戲比較大賣，推薦自己寫個支付服務器端來驗證支付結果）。

/* base64EncodedPublicKey should be YOUR APPLICATION‘S PUBLIC KEY* (that you got from the Google Play developer console). This is not your* developer public key, it‘s the *app-specific* public key.** Instead of just storing the entire literal string here embedded in the* program, construct the key at runtime from pieces or* use bit manipulation (for example, XOR with some other string) to hide* the actual key. The key itself is not secret information, but we don‘t* want to make it easy for an attacker to replace the public key with one* of their own and then fake messages from the server.*/String base64EncodedPublicKey = "CONSTRUCT_YOUR_KEY_AND_PLACE_IT_HERE";// Some sanity checks to see if the developer (that‘s you!) really followed the// instructions to run this sample (don‘t put these checks on your app!)if (base64EncodedPublicKey.contains("CONSTRUCT_YOUR")) {throw new RuntimeException("Please put your app‘s public key in MainActivity.java. See README.");}if (getPackageName().startsWith("com.example")) {throw new RuntimeException("Please change the sample‘s package name! See README.");}

本地服務器驗證補充：

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關于支付結果的驗證，本地服務器除了用publicKey做簽名驗證外，還可以到Google后臺請求下支付結果驗證。這個需要本地服務器和Google服務器交互通信。可以參考這個文檔。

不過對于國內的開發者而言，在Google日益被封鎖加重的情況下，在與Google服務器通信上絕對會有障礙，因為通信阻礙，會導致你驗證失敗，所以這個功能可選，有興趣的可以添加上。

補充1：

如果是直接用samples的代碼的話還需要注意幾點。第一，把錯誤提示改成用戶友好型的。因為samples的錯誤提示主要是給開發者看的，所以提示的很詳細，但是用戶不需要，你只要告訴用戶成功，失敗以及簡單的失敗原因就行了。第二，在發布正式版時把打印信息關掉。第三，修改類名和變量名。

補充2：

如果在測試支付時遇到一下錯誤，可做的處理。

1.當前應用程序不支持購買此商品:確定你手機上裝的程序包名和簽名和后臺上傳的一致。p.s.上傳后臺后APK需要等一段時間才能生效。

2.購買的商品不存在 ：確保你代碼里的商品名字和后臺的一致，如果一致，則可能需要等一兩個小時再測試，Google后臺的問題。

3.loading了很長時間，最后給你提示未知錯誤：這個不管它，Google后臺的問題，等會再測。

最后國內開發者確保是在vpn下進行測試！！！！

寫在后面：

以上就是Google In-app Billing的代碼添加了，其實就是把samples講了一下，所以還是推薦去看下官方文檔和samples吧，在那里你會學到更多。

總結

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