Xamarin Android: Android.Views.InflateException - Error when loading Layout

Question

I wrote a Xamarin Android app in Visual Studio to scan QR-Barcodes. I have two layouts and two lctivitys in my project. When i start the app, the emulator loads and the App starts correctly without a problem (The main screen is just one button that leads to a new Intent, which is my second layout/activity). Now when i click the button to switch to the next activity / layout, i get an exception, and the app crashes.

The exception happens in ActNewOrder.cs, where " SetContentView(Resource.Layout.lay1Copy); " is:

Unhandled Exception:

Android.Views.InflateException: <Timeout exceeded getting exception details>

i couldn't find anything on the internet, so i hope you guys can help me out.

Thank you very much in advance!

Here is my code for the ActNewOrder.cs:

using Android.App;
using Android.Widget;
using Android.OS;
using Android.Support.V7.App;
using Android.Views;
using Android.Gms.Vision.Barcodes;
using Android.Gms.Vision;
using Android.Graphics;
using Android.Runtime;
using System;
using Android.Support.V4.App;
using Android;
using Android.Content.PM;
using static Android.Gms.Vision.Detector;
using Android.Util;
using Android.Content;

namespace InstandhaltungApp
{
    [Activity(Label = "ActNewOrder", Theme = "@style/Theme.AppCompat.Light.NoActionBar")]
    public class ActNewOrder : AppCompatActivity, ISurfaceHolderCallback, IProcessor
    {
        SurfaceView cameraPreview;
        TextView txtResult;
        BarcodeDetector barcodeDetector;
        CameraSource cameraSource;
        const int RequestCameraPermissionID = 1001;


        public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Permission[] grantResults)
        {
            switch (requestCode)
            {
                case RequestCameraPermissionID:
                    {
                        if (grantResults[0] == Permission.Granted)
                        {
                            if (ActivityCompat.CheckSelfPermission(ApplicationContext, Manifest.Permission.Camera) != Android.Content.PM.Permission.Granted)
                            {
                                //Request permission
                                ActivityCompat.RequestPermissions(this, new string[]
                                {
                   Manifest.Permission.Camera
                                }, RequestCameraPermissionID);
                                return;
                            }
                            try
                            {
                                cameraSource.Start(cameraPreview.Holder);
                            }
                            catch (InvalidOperationException)
                            {

                            }
                        }
                    }
                    break;
            }
        }

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.lay1Copy);

            cameraPreview = FindViewById<SurfaceView>(Resource.Id.cameraPreview);
            txtResult = FindViewById<TextView>(Resource.Id.txtResult);

            barcodeDetector = new BarcodeDetector.Builder(this)
                .SetBarcodeFormats(BarcodeFormat.QrCode)
                .Build();
            cameraSource = new CameraSource
                .Builder(this, barcodeDetector)
                .SetRequestedPreviewSize(640, 480)
                .Build();

            cameraPreview.Holder.AddCallback(this);
            barcodeDetector.SetProcessor(this);
        }

        public void SurfaceChanged(ISurfaceHolder holder, [GeneratedEnum] Format format, int width, int height)
        {

        }

        public void SurfaceCreated(ISurfaceHolder holder)
        {
            if (ActivityCompat.CheckSelfPermission(ApplicationContext, Manifest.Permission.Camera) != Android.Content.PM.Permission.Granted)
            {
                //Request permission
                ActivityCompat.RequestPermissions(this, new string[]
                {
                   Manifest.Permission.Camera
                }, RequestCameraPermissionID);
                return;
            }
            try
            {
                cameraSource.Start(cameraPreview.Holder);
            }
            catch (InvalidOperationException)
            {

            }
        }

        public void SurfaceDestroyed(ISurfaceHolder holder)
        {
            cameraSource.Stop();
        }

        public void ReceiveDetections(Detections detections)
        {
            SparseArray qrcodes = detections.DetectedItems;
            if (qrcodes.Size() != 0)
            {
                txtResult.Post(() => {
                    Vibrator vib = (Vibrator)GetSystemService(Context.VibratorService);
                    vib.Vibrate(1000);
                    txtResult.Text = ((Barcode)qrcodes.ValueAt(0)).RawValue;
                });
            }
        }

        public void Release()
        {

        }
    }
}

And here is my code for the layout file, lay1Copy.xaml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.constraint.Guideline
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/main_left_gl"
        app:layout_constraintGuide_percent=".02"
        android:orientation="vertical" />
    <android.support.constraint.Guideline
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/main_right_gl"
        app:layout_constraintGuide_percent=".98"
        android:orientation="vertical" />
    <android.support.constraint.Guideline
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/button_left_gl"
        app:layout_constraintGuide_percent=".48"
        android:orientation="vertical" />
    <android.support.constraint.Guideline
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/button_right_gl"
        app:layout_constraintGuide_percent=".52"
        android:orientation="vertical" />
    <android.support.constraint.Guideline
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/main_top_gl"
        app:layout_constraintGuide_percent=".01"
        android:orientation="horizontal" />
    <android.support.constraint.Guideline
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/main_bottom_gl"
        app:layout_constraintGuide_percent=".75"
        android:orientation="horizontal" />
    <android.support.constraint.Guideline
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/elem_bottom_gl"
        app:layout_constraintGuide_percent=".85"
        android:orientation="horizontal" />
    <android.support.constraint.Guideline
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/elem_bottom_gl2"
        app:layout_constraintGuide_percent="0.99"
        android:orientation="horizontal" />
    <SurfaceView
        android:id="@+id/cameraPreview"
        android:width="0dp"
        android:height="0dp"
        app:layout_constraintLeft_toLeftOf="@+id/main_left_gl"
        app:layout_constraintRight_toRightOf="@+id/main_right_gl"
        app:layout_constraintTop_toTopOf="@+id/main_top_gl"
        app:layout_constraintBottom_toBottomOf="@+id/main_bottom_gl" />
    <TextView
        android:id="@+id/txtResult"
        android:layout_centerInParent="true"
        android:gravity="center_horizontal"
        android:width="0dp"
        android:height="0dp"
        android:layout_marginTop="15dp"
        android:textSize="20sp"
        android:layout_below="@+id/cameraPreview"
        android:text="Please focus Camera to QR Code"
        app:layout_constraintLeft_toLeftOf="@+id/main_left_gl"
        app:layout_constraintRight_toRightOf="@+id/main_right_gl"
        app:layout_constraintTop_toTopOf="@+id/main_bottom_gl"
        app:layout_constraintBottom_toBottomOf="@+id/elem_bottom_gl" />
    <Button
        android:id="@+id/btnSubmit"
        android:text="Wagen ansehen"
        android:width="0dp"
        android:height="0dp"
        app:layout_constraintLeft_toLeftOf="@+id/main_left_gl"
        app:layout_constraintRight_toRightOf="@+id/button_left_gl"
        app:layout_constraintTop_toTopOf="@+id/elem_bottom_gl"
        app:layout_constraintBottom_toBottomOf="@+id/elem_bottom_gl2" />
    <Button
        android:id="@+id/btnReset"
        android:text="Reset QR-Code"
        android:width="0dp"
        android:height="0dp"
        app:layout_constraintLeft_toLeftOf="@+id/button_right_gl"
        app:layout_constraintRight_toRightOf="@+id/main_right_gl"
        app:layout_constraintTop_toTopOf="@+id/elem_bottom_gl"
        app:layout_constraintBottom_toBottomOf="@+id/elem_bottom_gl2" />
</android.support.constraint.ConstraintLayout>

Answer 1

For every android android:layout_width and android:layout_height must be added, even with constraint layout.

The problem in your xml layout is starting from your SurfaceView , you only have android:width and android:height defined in your views.

So to resolve the problem, you need to change android:width to android:layout_width and android:height to android:layout_height .

Answer 2

I am also face this same issue and my layout does not contain any android:width and android:height properties. I missed to add theme for my activity. I solved this issue by following steps:

Create a styles.xml file under Resources\\values\\ folder with below codes:

<?xml version="1.0" encoding="utf-8" ?> 
<resources>
 <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    </style>
</resources>

In MainActivity.cs define the Activity attribute to leverage AppTheme like this:

[Activity(Label = "DinexFeedback", MainLauncher = true, Icon = "@drawable/icon",Theme ="@style/AppTheme")]
public class MainActivity : Android.Support.V7.App.AppCompatActivity
{
   ...
}

Updating the answer here because this might help others...

Answer 3

Unhandled Exception: Android.Views.InflateException:

Make sure the necessary nuget package installed in visual studio.

I used card view in my project, i got this issue becoz i didn't install Xamarin.Android.Support.cardview.

so we should install all support nuget package in order to support all widgets here i use card view.

click on project -> Manage Nuget-> check out the installed pakages, if the package were not installed just search the particular package and then download it.

updated on 10/12/2018

check your layout whether all the layout fields are started with capital letter. for ex : In android we used < view > in small letter but In c# we should use < View > otherwise it throws the inflate view exception.