Androidアプリ内課金について

###前提・実現したいこと
Androidで課金処理を作成したいです。

###発生している問題・エラーメッセージ
基本的にデベロッパーサイト通りに進めております。

E/EventBus: Could not dispatch event: class com.agrihd.japanpoint.dt.event.SendRequestEvent to subscribing class class com.agrihd.japanpoint.ui.activity.main.MainActivity
            java.lang.NullPointerException
                at com.agrihd.japanpoint.ui.activity.main.MainActivity.onEvent(MainActivity.java:159)
                at java.lang.reflect.Method.invokeNative(Native Method)
                at java.lang.reflect.Method.invoke(Method.java:515)
                at org.greenrobot.eventbus.EventBus.invokeSubscriber(EventBus.java:485)
                at org.greenrobot.eventbus.EventBus.postToSubscription(EventBus.java:420)
                at org.greenrobot.eventbus.EventBus.postSingleEventForEventType(EventBus.java:397)
                at org.greenrobot.eventbus.EventBus.postSingleEvent(EventBus.java:370)
                at org.greenrobot.eventbus.EventBus.post(EventBus.java:251)
                at com.agrihd.japanpoint.ui.activity.main.MainViewClient.hasStartPurchase(MainViewClient.java:40)
                at com.agrihd.japanpoint.ui.activity.main.MainViewClient.onLoadResource(MainViewClient.java:51)
                at com.android.webview.chromium.WebViewContentsClientAdapter.onLoadResource(WebViewContentsClientAdapter.java:359)
                at com.android.org.chromium.android_webview.AwContentsClientCallbackHelper$1.handleMessage(AwContentsClientCallbackHelper.java:95)
                at android.os.Handler.dispatchMessage(Handler.java:102)
                at android.os.Looper.loop(Looper.java:157)
                at android.app.ActivityThread.main(ActivityThread.java:5872)
                at java.lang.reflect.Method.invokeNative(Native Method)
                at java.lang.reflect.Method.invoke(Method.java:515)
                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1069)
                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:885)
                at dalvik.system.NativeStart.main(Native Method)
D/EventBus: No subscribers registered for event class org.greenrobot.eventbus.SubscriberExceptionEvent

###該当のソースコード

java
1    IInAppBillingService mService;
2
3    ServiceConnection mServiceConn = new ServiceConnection() {
4        @Override
5        public void onServiceDisconnected(ComponentName name) {
6            mService = null;
7        }
8
9        @Override
10        public void onServiceConnected(ComponentName name,
11                                       IBinder service) {
12            mService = IInAppBillingService.Stub.asInterface(service);
13        }
14    };
15
16    @Override
17    protected void onCreate(Bundle savedInstanceState) {
18        super.onCreate(savedInstanceState);
19        Bootstrap.startLocationService(this);
20        setContentView(R.layout.activity_main);
21        ButterKnife.bind(this);
22        UiUtil.showSplash(this);
23
24        Intent serviceIntent = new Intent("com.android.vending.billing.InAppBillingService.BIND");
25        serviceIntent.setPackage("com.agrihd.japanpoint");
26        bindService(serviceIntent, mServiceConn, Context.BIND_AUTO_CREATE);
27
28        if (UiUtil.chkNetwork(this, true)) {
29            UiUtil.chkAppPermissions(this);
30            mWebView.getSettings().setJavaScriptEnabled(true);
31            mWebView.getSettings().setSaveFormData(false);
32            mWebView.getSettings().setSupportMultipleWindows(true);
33            mWebView.setWebViewClient(new MainViewClient());
34            mWebView.setWebChromeClient(new MainChromeClient());
35            mWebView.loadUrl(Constants.MAIN_BASE_URL);
36        } else { /** network error. **/}
37    }
38
39    @Subscribe(threadMode = ThreadMode.MAIN)
40    public void onEvent(SendRequestEvent e) {
41        switch (e.mEventId) {
42            case Constants.SEND_REQUEST_RECEIPT:
43                if (UiUtil.chkCamera(this, true)) {
44                    Contexts.param(this,
45                            new AbstractMap.SimpleEntry(Contexts.USER_ID, e.mParams[0]),
46                            new AbstractMap.SimpleEntry(Contexts.RECEIPT_ID, e.mParams[1]));
47                    Intent intent = new Intent(getApplicationContext(), ReceiptActivity.class);
48                    ActivityCompat.startActivityForResult(this, intent, e.mEventId, null);
49                } else { /** camera permission error. **/}
50                break;
51            case Constants.SEND_REQUEST_PURCHASE:
52                ArrayList<String> skuList = new ArrayList<String>();
53                skuList.add("100points");
54                skuList.add("200points");
55                skuList.add("300points");
56                skuList.add("400points");
57                Bundle querySkus = new Bundle();
58                querySkus.putStringArrayList("ITEM_ID_LIST", skuList);
59
60                try {
61                    Bundle skuDetails = mService.getSkuDetails(3, getPackageName(), "inapp", querySkus);
62                    int response = skuDetails.getInt("RESPONSE_CODE");
63                    String sku = null;
64                    if (response == BILLING_RESPONSE_RESULT_OK) {
65                        ArrayList<String> responseList = skuDetails.getStringArrayList("DETAILS_LIST");
66                        for (String thisResponse : responseList) {
67                            JSONObject object = new JSONObject(thisResponse);
68                            sku = object.getString("productId");
69                                String price = object.getString("price");
70                                if (sku.equals("100points")) m100points = price;
71                                else if (sku.equals("200points")) m200points = price;
72                                else if (sku.equals("300points")) m300points = price;
73                                else if (sku.equals("400points")) m400points = price;
74                        }
75                        Bundle buyIntentBundle = mService.getBuyIntent(3, getPackageName(),
76                                sku, "inapp", "bGoa+V7g/yqDXvKRqq+JTFn4uQZbPiQJo4pf9RzJ");
77                        if( buyIntentBundle.getInt( "RESPONSE_CODE" ) == BILLING_RESPONSE_RESULT_OK ) {
78                            PendingIntent pendingIntent = buyIntentBundle.getParcelable("BUY_INTENT");
79                            startIntentSenderForResult(pendingIntent.getIntentSender(),
80                                    Constants.SEND_REQUEST_PURCHASE, new Intent(), Integer.valueOf(0), Integer.valueOf(0),
81                                    Integer.valueOf(0));
82                        }
83                    }
84                } catch (RemoteException | JSONException | IntentSender.SendIntentException ex) {
85                    ex.printStackTrace();
86                }
87                break;
88            default:
89                break;
90        }
91    }