在应用程序结算（v3） - 了解nullpointerexception

Question

我有一个应用程序，我在应用程序结算（v3）中添加了应用程序。已发布的应用似乎能够正常工作（我承认很少）我测试过的设备。该代码被混淆了proguard，但我保留了相应的proguard mapping.txt。

一些购买成功，但我也有崩溃的报告。然后我用retrace.bat翻译崩溃堆栈跟踪，并得到以下结果：

java.lang.NullPointerException 

at com.mycompany.mygame.util.IabHelper.void startSetup(com.mycompany.mygame.util.IabHelper$OnIabSetupFinishedListener)(Unknown Source) 
             void dispose() 
             void launchPurchaseFlow(android.app.Activity,java.lang.String,int,com.mycompany.mygame.util.IabHelper$OnIabPurchaseFinishedListener,java.lang.String) 
             boolean handleActivityResult(int,int,android.content.Intent) 
             com.mycompany.mygame.util.Inventory queryInventory$337baa91(boolean,java.util.List) 
             void queryInventoryAsync$69bb631c(java.util.List,com.mycompany.mygame.util.IabHelper$QueryInventoryFinishedListener) 
             java.lang.String getResponseDesc(int) 
             int getResponseCodeFromBundle(android.os.Bundle) 
             int queryPurchases(com.mycompany.mygame.util.Inventory,java.lang.String) 
             int querySkuDetails(java.lang.String,com.mycompany.mygame.util.Inventory,java.util.List) 
             void logDebug(java.lang.String) 

at com.mycompany.mygame.util.IabHelper.void startSetup(com.mycompany.mygame.util.IabHelper$OnIabSetupFinishedListener)(Unknown Source) 
             void dispose() 
             void launchPurchaseFlow(android.app.Activity,java.lang.String,int,com.mycompany.mygame.util.IabHelper$OnIabPurchaseFinishedListener,java.lang.String) 
             boolean handleActivityResult(int,int,android.content.Intent) 
             com.mycompany.mygame.util.Inventory queryInventory$337baa91(boolean,java.util.List) 
             void queryInventoryAsync$69bb631c(java.util.List,com.mycompany.mygame.util.IabHelper$QueryInventoryFinishedListener) 
             java.lang.String getResponseDesc(int) 
             int getResponseCodeFromBundle(android.os.Bundle) 
             int queryPurchases(com.mycompany.mygame.util.Inventory,java.lang.String) 
             int querySkuDetails(java.lang.String,com.mycompany.mygame.util.Inventory,java.util.List) 
             void logDebug(java.lang.String) 

at com.mycompany.mygame.util.IabHelper$2.void run()(Unknown Source) 
at java.lang.Thread.run(Thread.java:1019) 

我有点朦胧关于如何阅读堆栈跟踪，但我猜，也许有一个空指针在OnIabPurchaseFinishedListener中？？如果是这样，那会怎么发生？

编辑：“launchPurchaseFlow”是否出现在堆栈跟踪中是否意味着程序在用户试图购买东西时崩溃？

编辑：如这里要求的听众：

/** 
* Callback that notifies when a purchase is finished. 
*/ 
public interface OnIabPurchaseFinishedListener { 
    /** 
    * Called to notify that an in-app purchase finished. If the purchase was successful, 
    * then the sku parameter specifies which item was purchased. If the purchase failed, 
    * the sku and extraData parameters may or may not be null, depending on how far the purchase 
    * process went. 
    * 
    * @param result The result of the purchase. 
    * @param info The purchase information (null if purchase failed) 
    */ 
    public void onIabPurchaseFinished(IabResult result, Purchase info); 
} 

Answer 1

也许这涉及到在这里提出的问题： https://code.google.com/p/android/issues/detail?id=42338

更新的代码尚未推出的SDK管理器还，但您可以在此处查看与此问题相关的所有更改：https://code.google.com/p/marketbilling/source/detail?r=7ec85a9b619fc5f85023bc8125e7e6b1ab4dd69f

有4个文件受此问题影响。进行他们建议的更改，看看是否仍遇到同样的问题。