在应用计费 (v3) - 了解 nullpointerexception

Question

我有一个已添加到应用计费 (v3) 中的应用。已发布的应用程序似乎在我测试的（当然数量很少）设备上运行良好。代码被proguard混淆了，但我保留了对应的proguard mapping.txt。

成功进行了一些购买，但我也收到了有关崩溃的报告。然后我使用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)

我对如何读取堆栈跟踪有点模糊，但我猜 OnIabPurchaseFinishedListener 中可能有一个空指针......？如果是这样，那是怎么发生的？

编辑：“launchPurchaseFlow”出现在堆栈跟踪中是否意味着程序在用户尝试购买东西时崩溃了？

编辑：根据要求，这里是听众：

/**
 * 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

也许这与这里提出的问题有关： https://code.google.com/p/android/issues/detail?id=42338

更新的代码尚未推送到 SDK Manager，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，看看您是否仍然遇到同样的问题。