檢索商品價格時，Android應用內結算崩潰

Question

我正在嘗試實施Android應用內結算。

到目前為止我做了什么：

1. 添加了aidl文件。
2. 添加了util-helper文件。
3. 在Play Console上創建了應用程序
4. 上傳已signed APK並將產品添加到Play控制台。
5. 在Shop.java文件中添加了一些代碼。 哪個工作正常，直到我嘗試檢索項目價格（參見之間的代碼： //THIS IS WHERE THE APP CRASHES ）。

這是我在Shop.java onCreate()中使用的代碼

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();
    }
};

錯誤信息：

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對象。 但是這個對象可以為null

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