在getByIntent（...）的App Billing NullPointerException中！

Question

我正在尝试在我的应用程序中使用InAppBilling。我之前使用过类似的代码并且它有效但现在我遇到了错误！我的logcat：

08-19 16:19:38.096: E/AndroidRuntime(27034): FATAL EXCEPTION: Thread-3594
08-19 16:19:38.096: E/AndroidRuntime(27034): java.lang.NullPointerException
08-19 16:19:38.096: E/AndroidRuntime(27034):    at com.taygon.tick_one.Buy$2.run(Buy.java:101)
08-19 16:19:38.096: E/AndroidRuntime(27034):    at java.lang.Thread.run(Thread.java:841)

当我双击第3行时，它突出显示getBuyIntent(...)功能。这是我的代码：

IInAppBillingService mService;

ServiceConnection mServiceConn = new ServiceConnection() {
    @Override
    public void onServiceDisconnected(ComponentName name) {
        mService = null;
    }

    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        mService = IInAppBillingService.Stub.asInterface(service);
    }
};

@Override
public void onDestroy() {
    super.onDestroy();
    if (mServiceConn != null) {
        try {
            unbindService(mServiceConn);
        } catch (Exception ex) {
        }
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    if (requestCode == 1372) {

        String purchaseData = data.getStringExtra("INAPP_PURCHASE_DATA");

        if (resultCode == RESULT_OK) {

            try {

                JSONObject jo = new JSONObject(purchaseData);
                Toast.makeText(Buy.this, "Thank you",
                        Toast.LENGTH_SHORT).show();

            } catch (JSONException e) {
                Toast.makeText(Buy.this,
                        "Error Happend!",
                        Toast.LENGTH_SHORT).show();
                e.printStackTrace();
            }
        }

        else
            Toast.makeText(Buy.this, "Not Compeleted",
                    Toast.LENGTH_SHORT).show();
    }
}






public void buy_package() {
            try {
                Bundle buyIntentBundle;
                buyIntentBundle = mService
                        .getBuyIntent(
                                3,
                                getApplicationContext().getPackageName(),
                                "Product Serial Number",
                                "inapp",
                                "My App RSA Code");

                PendingIntent pendingIntent = buyIntentBundle
                        .getParcelable("BUY_INTENT");

                startIntentSenderForResult(pendingIntent.getIntentSender(),
                        1372, new Intent(), Integer.valueOf(0),
                        Integer.valueOf(0), Integer.valueOf(0));

            } catch (RemoteException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (SendIntentException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
}