检索商品价格时，Android 应用内结算崩溃

Question

我正在尝试实现Android应用内计费。

到目前为止我做了什么：

1. 添加了aidl文件。
2. 添加了util-helper文件。
3. 在 Play 管理中心内创建了该应用
4. 上传了signed APK并将产品添加到 Play 管理中心。
5. 在Shop.java文件中添加了一些代码。在我尝试检索商品价格之前，它工作正常(请参阅代码：//THIS IS WHERE THE APP CRASHES下)。

这是我在onCreate()中使用的代码Shop.java

onCreate() {
//In App Billing
key = "XXX";
mHelper = new IabHelper(this, key);
mHelper.startSetup(new IabHelper.OnIabSetupFinishedListener() {
public void onIabSetupFinished(IabResult result) {
if (!result.isSuccess()) {
Log.d(TAG, "In-app Billing setup failed: " + result);
return;
}
if (mHelper == null) return;

Log.d(TAG, "Setup successful. Querying inventory.");
try {
mHelper.queryInventoryAsync(mGotInventoryListener);
} catch (IabHelper.IabAsyncInProgressException e) {
}
}
});
}

然后是mGotInventoryListener：

IabHelper.QueryInventoryFinishedListener mGotInventoryListener = new IabHelper.QueryInventoryFinishedListener() {
public void onQueryInventoryFinished(IabResult result, Inventory inventory) {
// Have we been disposed of in the meantime? If so, quit.
if (mHelper == null) return;
if (result.isFailure()) {
// handle error
return;
}
Log.d(TAG, "Query inventory was successful.");
// Do we have the premium upgrade?
Purchase premiumPurchase = inventory.getPurchase(ITEM_SKU);
boolean mIsPremium = (premiumPurchase != null);
Log.d(TAG, "User is " + (mIsPremium ? "PREMIUM" : "NOT PREMIUM"));

//THIS IS WHERE THE APP CRASHES
String price = inventory.getSkuDetails(ITEM_SKU).getPrice();
//THIS IS WHERE THE APP CRASHES

updateUI();
}
};

错误信息：

E/AndroidRuntime: FATAL EXCEPTION: main
     Process: example.com.app, PID: 4270
     java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String example.com.app.util.SkuDetails.getPrice()' on a null object reference
         at example.com.app.Shop$2.onQueryInventoryFinished(Shop.java:234)
         at example.com.app.util.IabHelper$2$1.run(IabHelper.java:711)
         at android.os.Handler.handleCallback(Handler.java:751)
         at android.os.Handler.dispatchMessage(Handler.java:95)
         at android.os.Looper.loop(Looper.java:154)
         at android.app.ActivityThread.main(ActivityThread.java:6692)
         at java.lang.reflect.Method.invoke(Native Method)
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)

Answer 1

inventory.getSkuDetails(ITEM_SKU);

返回 SkuDetails 对象。但此对象可以为空

SkuDetails details = inventory.getSkuDetails(ITEM_SKU);
if (details == null) {
return;
};
String price = details.getPrice();