Xamarin forms, App running on Visual Studio Android Emulator But crashes on real device

Question

I have created an app,when build the app runs perfect on Visual Studio emulator. So I created release built and tried running the app on my physical android device. I am getting following error message on Device. I have used Xam.plugin.media

android.runtime.JavaProxyThrowable: System.NullReferenceException: Object reference not set to an instance of an object at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.InternalSetPage (Xamarin.Forms.Page page) [0x0006f] in :0 at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.SetMainPage () [0x0000c] in :0 at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.LoadApplication (Xamarin.Forms.Application application) [0x0025c] in :0 at InterestMatch.Droid.MainActivity.OnCreate (Android.OS.Bundle bundle) [0x00033] in <9e2a066af7c24de6828dc3a0f4e22d31>:0 at Android.Support.V4.App.FragmentActivity.n_OnCreate_Landroid_os_Bundle_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_savedInstanceState) [0x0000f] in <1e89c43d3c7d48b5ba69bfc0b1bdf114>:0 at (wrapper dynamic-method) System.Object:6b534aff-3541-46f2-a92e-ac0022b9c4a7 (intptr,intptr,intptr) at md5ed93386354f0e17f050b2885712023ca.MainActivity.n_onCreate(Native Method) at md5ed93386354f0e17f050b2885712023ca.MainActivity.onCreate(MainActivity.java:29) at android.app.Activity.performCreate(Activity.java:6303) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2402) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2509) at android.app.ActivityThread.access$1000(ActivityThread.java:153) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1373) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:5523) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629)

Here is my code

MainActivity.cs

public class MainActivity global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
    protected override void OnCreate(Bundle bundle)
    {
        TabLayoutResource = Resource.Layout.Tabbar;
        ToolbarResource = Resource.Layout.Toolbar;



        Plugin.CurrentActivity.CrossCurrentActivity.Current.Activity = this;

        base.OnCreate(bundle);

        global::Xamarin.Forms.Forms.Init(this, bundle);
        LoadApplication(new App());
    }



    public override void OnRequestPermissionsResult(int requestCode, string[] permissions, Android.Content.PM.Permission[] grantResults)
    {
        PermissionsImplementation.Current.OnRequestPermissionsResult(requestCode, permissions, grantResults);
    }

}

app.xaml.cs

     using InterestMatch.Inter;
     using InterestMatch.Models;
     using System;
     using System.Collections.Generic;
     using System.Linq;
     using System.Text;
     using Xamarin.Auth;
     using Xamarin.Forms;

     namespace InterestM
     {
     public partial class App : Application
{

    public static string AppName { get { return "StoreAccountInfoApp"; } }

    public static ICredentialsService CredentialsService { get; private set; }

    public App ()
    {                      
         var account = AccountStore.Create().FindAccountsForService(App.AppName).FirstOrDefault();

         CredentialsService = new CredentialsService();

        if (CredentialsService.DoCredentialsExist())
        {
            InitializeComponent();               
            MainPage = new NavigationPage(new InterestM.MainMenu(account.Username.ToString()));
        }
        else
        {
            InitializeComponent();
            MainPage = new NavigationPage(new InterestM.Accounts.Login());
        }

    }

    protected override void OnStart ()
    {
        // Handle when your app starts
    }

    protected override void OnSleep ()
    {
        // Handle when your app sleeps
    }

    protected override void OnResume ()
    {
        // Handle when your app resumes
    }
}

}

AliUlug AliUlug · Accepted Answer · 2018-03-03T23:02:44

Changing Android project options fixed the issue for me.

Open your Android project's Properties. Go to Android Options. Change Linking property to "Sdk Assemblies Only".

Xamarin forms, App running on Visual Studio Android Emulator But crashes on real device

1 Answers