在應用程序結算（v3） - 瞭解nullpointerexception

Question

我有一個應用程序，我在應用程序結算（v3）中添加了應用程序。已發佈的應用似乎能夠正常工作（我承認很少）我測試過的設備。該代碼被混淆了proguard，但我保留了相應的proguard mapping.txt。

一些購買成功，但我也有崩潰的報告。然後我用retrace.bat翻譯崩潰堆棧跟蹤，並得到以下結果：

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) 

我有點朦朧關於如何閱讀堆棧跟蹤，但我猜，也許有一個空指針在OnIabPurchaseFinishedListener中？？如果是這樣，那會怎麼發生？

編輯：「launchPurchaseFlow」是否出現在堆棧跟蹤中是否意味着程序在用戶試圖購買東西時崩潰？

編輯：如這裏要求的聽衆：

/** 
* 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

也許這涉及到在這裏提出的問題： https://code.google.com/p/android/issues/detail?id=42338

更新的代碼尚未推出的SDK管理器還，但您可以在此處查看與此問題相關的所有更改：https://code.google.com/p/marketbilling/source/detail?r=7ec85a9b619fc5f85023bc8125e7e6b1ab4dd69f

有4個文件受此問題影響。進行他們建議的更改，看看是否仍遇到同樣的問題。