App Crashing when selecting Contact (and trying to go back) using new Xamarin Essential

Vinayak Juneja 1 Reputation point
2021-03-04T21:59:37.463+00:00

I tried using the Xamarin Essential API to pick and display a single contact. Unfortunately, the app goes to the background as soon as I select a contact from my emulator. When trying to select the app from the app dashboard, it returns back to its first page.

Also, when in the contacts window, if I press the back button (hardware back button or the one in the navigation bar), the app crashes. So in both ways, I am not able to access the contact being displayed.

Surprisingly, when I put in breakpoints, I could see the selected contact coming in. I could see all the data.

I am using MvvmCross, and my point of reference was James Montemagno's latest Xamarin.Essential Contact API video and the Contacts API Xamarin.Forms documentation.

Here are my files:

MainActivity.cs 

//[Activity(Label = "Vary.Core", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize)]  
        [Activity(Label = "Vary.Core", MainLauncher = true, Theme = "@style/MainTheme", NoHistory = true)]  
        public class MainActivity : MvxFormsAppCompatActivity<Setup, Core.MvxApp, App> //MvxFormsAndroidSetup<Core.MvxApp, App> //Setup  
        {  
            protected override void OnCreate(Bundle savedInstanceState)  
            {  
                TabLayoutResource = Resource.Layout.Tabbar;  
                ToolbarResource = Resource.Layout.Toolbar;  
      
                base.OnCreate(savedInstanceState);  
      
                Xamarin.Essentials.Platform.Init(this, savedInstanceState);  
                global::Xamarin.Forms.Forms.Init(this, savedInstanceState);  
                //LoadApplication(new App());  
            }  
            public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)  
            {  
                Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);  
      
                base.OnRequestPermissionsResult(requestCode, permissions, grantResults);  
            }  
      
            protected override void OnResume()  
            {  
                base.OnResume();  
      
                Xamarin.Essentials.Platform.OnResume();  
            }  
      
            protected override void OnPause()  
            {  
                base.OnPause();  
            }

ContactDisplayViewModel.cs --> Method used to select contact on button press 

async void OnSelectSingleContactSelected()  
            {  
                try  
                {  
                    var contact = await Contacts.PickContactAsync();  
      
                    if (contact == null)  
                        return;  
      
                    var contactInfo = new StringBuilder();  
                    contactInfo.AppendLine(contact.DisplayName);  
                    contactInfo.AppendLine(contact.FamilyName);  
                    contactInfo.AppendLine(contact.Emails.FirstOrDefault().ToString());  
                    contactInfo.AppendLine(contact.Phones.FirstOrDefault().ToString());  
      
                    IsSingleContactRequired = true;  
                    ContactInformation = contactInfo.ToString();  
                }  
                catch(Exception ex)  
                {  
                    Debug.WriteLine(ex.Message);  
                }  
            }

ContactDisplayView.xaml 

 <Button Grid.Row="0"  
                            Grid.Column="0"  
                            BackgroundColor="Transparent"  
                            Text="Pick A Contact"  
                            Command="{Binding SelectSingleContactCommand}"/>  
      
                    <Label Grid.Row="1"  
                           Grid.Column="1"  
                           Grid.ColumnSpan="2"  
                           Text="{Binding ContactInformation}"  
                           TextColor="DarkOrange"  
                           IsVisible="{Binding IsSingleContactRequired}"/>

Has anyone encountered this crash, or in general, any crash issue when trying to navigate back to your Xamarin.Forms app from any such native/system defined app?

Here is the application output : 

[Mono] Assembly Loader probing location: '/Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/sdks/out/android-x86-release/lib/Xamarin.Forms.Platform.Android.AppLinks.exe'.  
[Mono] Assembly Loader probing location: '//Facades/Xamarin.Forms.Platform.Android.AppLinks.exe'.  
[Mono] Requesting loading reference 13 (of 22) of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.Forms.Platform.Android.dll  
[Mono] Loading reference 13 of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.Forms.Platform.Android.dll asmctx DEFAULT, looking for Xamarin.AndroidX.Legacy.Support.Core.UI, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null  
[Mono] Assembly Ref addref Xamarin.Forms.Platform.Android[0xe64638e0] -> Xamarin.AndroidX.Legacy.Support.Core.UI[0xe6461de0]: 2  
[Mono] Requesting loading reference 3 (of 4) of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.AndroidX.Legacy.Support.Core.UI.dll  
[Mono] Loading reference 3 of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.AndroidX.Legacy.Support.Core.UI.dll asmctx DEFAULT, looking for Xamarin.AndroidX.DrawerLayout, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null  
[Mono] Requesting loading reference 2 (of 4) of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.AndroidX.Legacy.Support.Core.UI.dll  
[Mono] Loading reference 2 of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.AndroidX.Legacy.Support.Core.UI.dll asmctx DEFAULT, looking for Java.Interop, Version=0.1.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065  
[Mono] Assembly Ref addref Xamarin.AndroidX.Legacy.Support.Core.UI[0xe6461de0] -> Java.Interop[0xe649f180]: 21  
[Mono] DllImport searching in: '__Internal' ('(null)').  
[Mono] Searching for 'java_interop_jnienv_call_static_int_method_a'.  
[Mono] Probing 'java_interop_jnienv_call_static_int_method_a'.  
[Mono] Found as 'java_interop_jnienv_call_static_int_method_a'.  
[Mono] DllImport searching in: '__Internal' ('(null)').  
[Mono] Searching for 'java_interop_jnienv_call_nonvirtual_int_method_a'.  
[Mono] Probing 'java_interop_jnienv_call_nonvirtual_int_method_a'.  
[Mono] Found as 'java_interop_jnienv_call_nonvirtual_int_method_a'.  
Thread started:  #12  
[HostConnection] HostConnection::get() New Host Connection established 0xc0ada410, tid 17005  
[HostConnection] HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_native_sync_v4 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_YUV420_888_to_NV21 ANDROID_EMU_YUV_Cache ANDROID_EMU_async_unmap_buffer GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_host_side_tracing ANDROID_EMU_gles_max_version_3_0   
[OpenGLRenderer] Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...  
[eglCodecCommon] setVertexArrayObject: set vao to 0 (0) 0 0  
[EGL_emulation] eglCreateContext: 0xe650a220: maj 3 min 0 rcv 3  
[EGL_emulation] eglMakeCurrent: 0xe650a220: ver 3 0 (tinfo 0xbe49d190)  
[Gralloc3] mapper 3.x is not supported  
[HostConnection] createUnique: call  
[HostConnection] HostConnection::get() New Host Connection established 0xbe2518a0, tid 17005  
[HostConnection] HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_native_sync_v4 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_YUV420_888_to_NV21 ANDROID_EMU_YUV_Cache ANDROID_EMU_async_unmap_buffer GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_host_side_tracing ANDROID_EMU_gles_max_version_3_0   
[eglCodecCommon] allocate: Ask for block of size 0x1000  
[eglCodecCommon] allocate: ioctl allocate returned offset 0x3ff24c000 size 0x2000  
[Mono] Requesting loading reference 8 (of 9) of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Vary.Core.Android.dll  
[Mono] Loading reference 8 of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Vary.Core.Android.dll asmctx DEFAULT, looking for Xamarin.Forms.Platform, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null  
[Mono] Assembly Ref addref Vary.Core.Android[0xe64538c0] -> Xamarin.Forms.Platform[0xe64639a0]: 3  
[Mono] DllImport searching in: '__Internal' ('(null)').  
[Mono] Searching for 'java_interop_jnienv_call_nonvirtual_float_method_a'.  
[Mono] Probing 'java_interop_jnienv_call_nonvirtual_float_method_a'.  
[Mono] Found as 'java_interop_jnienv_call_nonvirtual_float_method_a'.  
[EGL_emulation] eglMakeCurrent: 0xe650a220: ver 3 0 (tinfo 0xbe49d190)  
[eglCodecCommon] setVertexArrayObject: set vao to 0 (0) 1 0  
[Mono] Requesting loading reference 11 (of 22) of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.Forms.Platform.Android.dll  
[Mono] Loading reference 11 of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.Forms.Platform.Android.dll asmctx DEFAULT, looking for Xamarin.AndroidX.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null  
[Mono] Assembly Ref addref Xamarin.Forms.Platform.Android[0xe64638e0] -> Xamarin.AndroidX.Core[0xe6461900]: 7  
[Mono] Requesting loading reference 16 (of 22) of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.Forms.Platform.Android.dll  
[Mono] Loading reference 16 of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.Forms.Platform.Android.dll asmctx DEFAULT, looking for Xamarin.AndroidX.SwipeRefreshLayout, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null  
[Mono] Assembly Ref addref Xamarin.Forms.Platform.Android[0xe64638e0] -> Xamarin.AndroidX.SwipeRefreshLayout[0xe6463040]: 2  
[Mono] Requesting loading reference 3 (of 4) of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.AndroidX.SwipeRefreshLayout.dll  
[Mono] Loading reference 3 of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.AndroidX.SwipeRefreshLayout.dll asmctx DEFAULT, looking for Xamarin.AndroidX.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null  
[Mono] Assembly Ref addref Xamarin.AndroidX.SwipeRefreshLayout[0xe6463040] -> Xamarin.AndroidX.Core[0xe6461900]: 8  
[Mono] Requesting loading reference 2 (of 4) of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.AndroidX.SwipeRefreshLayout.dll  
[Mono] Loading reference 2 of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.AndroidX.SwipeRefreshLayout.dll asmctx DEFAULT, looking for Java.Interop, Version=0.1.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065  
[Mono] Assembly Ref addref Xamarin.AndroidX.SwipeRefreshLayout[0xe6463040] -> Java.Interop[0xe649f180]: 22  
[Mono] DllImport searching in: '__Internal' ('(null)').  
[Mono] Searching for 'java_interop_jnienv_call_static_void_method_a'.  
[Mono] Probing 'java_interop_jnienv_call_static_void_method_a'.  
[Mono] Found as 'java_interop_jnienv_call_static_void_method_a'.  
[Mono] DllImport searching in: '__Internal' ('(null)').  
[Mono] Searching for 'java_interop_jnienv_call_float_method_a'.  
[Mono] Probing 'java_interop_jnienv_call_float_method_a'.  
[Mono] Found as 'java_interop_jnienv_call_float_method_a'.  
2021-03-05 03:03:56 [TRACE] (MvxForms) PresentationAttribute not found for ContactDisplayViewModel. Assuming ContentPage presentation  
2021-03-05 03:03:56 [TRACE] (MvvmCross.Logging.MvxLog) No view model association found for candidate view MainActivity  
2021-03-05 03:03:56 [TRACE] (MvvmCross.Logging.MvxLog) No view model association found for candidate view MainActivity  
[Mono] DllImport searching in: '__Internal' ('(null)').  
[Mono] Searching for 'java_interop_jnienv_is_assignable_from'.  
[Mono] Probing 'java_interop_jnienv_is_assignable_from'.  
[Mono] Found as 'java_interop_jnienv_is_assignable_from'.  
Resolved pending breakpoint at 'ContactDisplayViewModel.cs:67,1' to void Vary.Core.ViewModels.ContactDisplayViewModel.<OnSelectSingleContactSelected>d__13.MoveNext () [0x0015b].  
[Mono] Requesting loading reference 5 (of 8) of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.Essentials.dll  
[Mono] Loading reference 5 of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.Essentials.dll asmctx DEFAULT, looking for System.Core, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e  
[Mono] Assembly Ref addref Xamarin.Essentials[0xe64636a0] -> System.Core[0xe64a0140]: 9  
[Mono] DllImport searching in: '__Internal' ('(null)').  
[Mono] Searching for 'java_interop_jnienv_get_object_field'.  
[Mono] Probing 'java_interop_jnienv_get_object_field'.  
[Mono] Found as 'java_interop_jnienv_get_object_field'.  
[EGL_emulation] eglMakeCurrent: 0xe650a220: ver 3 0 (tinfo 0xbe49d190)  
[EGL_emulation] eglMakeCurrent: 0xe650a220: ver 3 0 (tinfo 0xbe49d190)  
[Mono] Requesting loading reference 12 (of 22) of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.Forms.Platform.Android.dll  
[Mono] Loading reference 12 of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.Forms.Platform.Android.dll asmctx DEFAULT, looking for System.Runtime.Serialization, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e  
[Mono] Assembly Ref addref Xamarin.Forms.Platform.Android[0xe64638e0] -> System.Runtime.Serialization[0xe64a17c0]: 4  
[Mono] DllImport searching in: 'libmono-native.so' ('./libmono-native.so').  
[Mono] Searching for 'SystemNative_MkDir'.  
[Mono] Probing 'SystemNative_MkDir'.  
[Mono] Found as 'SystemNative_MkDir'.  
[Mono] Requesting loading reference 21 (of 22) of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.Forms.Platform.Android.dll  
[Mono] Loading reference 21 of /storage/emulated/0/Android/data/com.vinayakjuneja.vary/files/.__override__/Xamarin.Forms.Platform.Android.dll asmctx DEFAULT, looking for System.Xml, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e  
[Mono] Assembly Ref addref Xamarin.Forms.Platform.Android[0xe64638e0] -> System.Xml[0xe64a16a0]: 7  
[System] A resource failed to call close.   
[System] A resource failed to call close.
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