InAppBillingPlugin: NRE on ConnectAsync() call

@jamesmontemagno … Thanks for producing this plugin.

I think it’s working on iOS. It worked with a hardwired iPhone (sandbox). ~I’m waiting on feedback from a Test Flight tester to see if the published release build works on iOS.~ [EDIT] Yes, works fine on iOS in Test Flight.

On the Android side, I’m getting an NRE on the ConnectAsync() line:

Idk how to debug it. Can you provide guidance on what to do next?

Bug

Version Number of Plugin: 1.1.0.23-beta Device Tested On: Alcatel A460T (PIXI3_4TF) Simulator Tested On: N/A

Crash Report

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)
	at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
	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:828)
	... 2 more
Caused by: android.runtime.JavaProxyThrowable: System.NullReferenceException: Object reference not set to an instance of an object
  at Plugin.InAppBilling.InAppBillingImplementation+InAppBillingServiceConnection.ConnectAsync () [0x00037] in <1ecca8595de5416485857bb67e2ec090>:0 
  at Plugin.InAppBilling.InAppBillingImplementation.ConnectAsync () [0x00000] in <1ecca8595de5416485857bb67e2ec090>:0 
  at OkayKidO.PurchaseRecallAlertsPage+<<-ctor>b__7_1>d.MoveNext () [0x00038] in <9ba60b7d2d04489bb8fa7b24e508a624>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <4320a1443daa4b43887537c6c14e77d7>:0 
  at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>m__0 (System.Object state) [0x00000] in <4320a1443daa4b43887537c6c14e77d7>:0 
  at Android.App.SyncContext+<Post>c__AnonStorey0.<>m__0 () [0x00000] in <c7e72ae5f1bb4848b22a1b9d2ab62bc1>:0 
  at Java.Lang.Thread+RunnableImplementor.Run () [0x0000b] in <c7e72ae5f1bb4848b22a1b9d2ab62bc1>:0 
  at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00009] in <c7e72ae5f1bb4848b22a1b9d2ab62bc1>:0 
  at (wrapper dynamic-method) System.Object:c20c090a-8004-49ef-9b1a-a7360f44a814 (intptr,intptr)
	at mono.java.lang.RunnableImplementor.n_run(Native Method)
	at mono.java.lang.RunnableImplementor.run(RunnableImplementor.java:30)
	at android.os.Handler.handleCallback(Handler.java:808)
	at android.os.Handler.dispatchMessage(Handler.java:103)
	at android.os.Looper.loop(Looper.java:193)
	at android.app.ActivityThread.main(ActivityThread.java:5335)

MainActivity.cs

using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.OS;
using Plugin.CurrentActivity;
using Plugin.InAppBilling;
using System;
using System.Globalization;
using Xamarin.Forms;

namespace OkayKidO.Droid
{
    [Activity(Label = "@string/app_name", Icon = "@drawable/icon", Theme = "@style/MainTheme", ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation, ScreenOrientation = ScreenOrientation.Portrait )]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        public static string Version { get; set; }
        public static string Build { get; set; }

        protected override void OnCreate(Bundle bundle)
        {
            TabLayoutResource = Resource.Layout.Tabbar;
            ToolbarResource = Resource.Layout.Toolbar;

            base.OnCreate(bundle);

            Forms.Init(this, bundle);

            Version = PackageManager.GetPackageInfo(PackageName, 0).VersionName;
            Build = Convert.ToString(PackageManager.GetPackageInfo(PackageName, 0).VersionCode, CultureInfo.InvariantCulture);

            LoadApplication(new App());
        }

        public override void OnLowMemory()
        {
            GC.Collect();
        }

        protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
        {
            base.OnActivityResult(requestCode, resultCode, data);
            InAppBillingImplementation.HandleActivityResult(requestCode, resultCode, data);
        }

        public void OnActivityCreated(Activity activity, Bundle savedInstanceState)
        {
            CrossCurrentActivity.Current.Activity = activity;
        }

        public void OnActivityResumed(Activity activity)
        {
            CrossCurrentActivity.Current.Activity = activity;
        }

        public void OnActivityStarted(Activity activity)
        {
            CrossCurrentActivity.Current.Activity = activity;
        }
    }
}

packages.config

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="ExifLib.PCL" version="1.0.1" targetFramework="monoandroid70" />
  <package id="Newtonsoft.Json" version="9.0.1" targetFramework="monoandroid70" />
  <package id="Plugin.CurrentActivity" version="1.0.1" targetFramework="monoandroid70" />
  <package id="Plugin.InAppBilling" version="1.1.0.23-beta" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Animated.Vector.Drawable" version="24.2.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Compat" version="24.2.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Core.UI" version="24.2.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Core.Utils" version="24.2.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Design" version="24.2.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Fragment" version="24.2.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Media.Compat" version="24.2.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Transition" version="24.2.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.v4" version="24.2.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.v7.AppCompat" version="24.2.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.v7.CardView" version="24.2.1" targetFramework="monoandroid71" />
  <package id="Xamarin.Android.Support.v7.MediaRouter" version="24.2.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.v7.Palette" version="24.2.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.v7.RecyclerView" version="24.2.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Android.Support.Vector.Drawable" version="24.2.1" targetFramework="monoandroid70" />
  <package id="Xamarin.Build.Download" version="0.4.2" targetFramework="monoandroid70" />
  <package id="Xamarin.Forms" version="2.3.3.193" targetFramework="monoandroid70" />
</packages>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:installLocation="auto" android:versionName="1.1" package="com.seattlecreations.okaykido" android:versionCode="10">
	<uses-sdk android:minSdkVersion="15" />
	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
	<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
	<uses-permission android:name="android.permission.INTERNET" />
	<uses-permission android:name="android.permission.RECORD_AUDIO" />
	<uses-permission android:name="android.permission.MICROPHONE" />
	<uses-permission android:name="com.android.vending.BILLING" />
	<application android:label="Okay Kid-O" android:icon="@drawable/icon" />
</manifest>