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应用内计费（v3）- 理解空指针异常

androidin-app-purchase
6

我有一个应用程序，在其中添加了应用内计费（v3）。我测试的设备数量虽然很少，但已发布的应用似乎运行良好。该代码已使用proguard进行混淆，但我保留了相应的proguard mapping.txt。

有几个购买成功了，但我也收到了崩溃报告。然后我使用retrace.bat来翻译崩溃堆栈跟踪，并得到了以下结果：

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)

我对如何阅读堆栈跟踪有点模糊，但我猜测可能在OnIabPurchaseFinishedListener中存在空指针引用？如果是这样，那么可能是怎么发生的呢？
编辑：堆栈跟踪中出现“launchPurchaseFlow”这个事实是否意味着程序在用户尝试购买某些东西时崩溃了？
编辑：按要求这里是监听器：
/**
 * 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);
}
你的应用程序中是否使用了Google的“默认”代码？ - class stacker
请发布 OnIabSetupFinishedListener 监听器代码。 - ρяσѕρєя K
@class stacker：不是很确定你的意思...但我正在使用谷歌提供的IabHelper类。 - Mick
@Mick：不确定问题出在哪里，可能您缺少了一些参数。请查看此[应用内购买（v3）]的工作示例（https://github.com/blundell/SimpleInAppPurchaseV3）。 - ρяσѕρєя K
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5
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