Custom Popup Dialog In Xamarin Android

Introduction

In this article, we go step by step to build a custom popup dialog for Xamarin Android. The popup dialog is just a window that prompts to enter additional details. Where we can use the popup dialog means, in some cases, we want some decision from the user without changing the activity or screen.

Output

Let's start.

Step 1. First, create a simple Xamarin Android Application by going to New, Select Android, followed by clicking Next.

Android App

Step 2. Here give the project name, organization name, app compatibility, and app theme, then click Create project.

Organization name

Step 3. After the project creation, double-click to open Main. axml. For that, Solution Explorer >> expand the Resources folder and Layout folder, double click to open Main. axml. Now, drag and drop to place one button, this page code is given below.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Button
        android:text="Show Popup"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAllCaps="false"
        android:id="@+id/btnPopup" />
</LinearLayout>

Step 4. Now, add a new Layout named Popup. axml. For that, right-click the Layout Folder and select Add New, and the new popup window will appear, select Layout and name as Popup.axml and click Add.

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:background="@android:color/white">

        <TextView
            android:id="@+id/allocate_collector"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            android:layout_width="wrap_content"
            android:layout_height="18dp"
            android:layout_marginTop="15dp"
            android:layout_marginLeft="10dp"
            android:text="Custom Title"
            android:textStyle="bold"
            android:textSize="16dp"
            android:maxLines="1"
            android:textColor="@android:color/black"/>

        <TextView
            android:id="@+id/patient"
            app:layout_constraintTop_toBottomOf="@+id/allocate_collector"
            app:layout_constraintStart_toStartOf="parent"
            android:layout_marginTop="20dp"
            android:layout_marginLeft="10dp"
            android:layout_width="wrap_content"
            android:layout_height="14dp"
            android:text="My Name"
            android:textSize="12dp"/>

        <android.support.design.widget.TextInputLayout
            android:id="@+id/collector_name_txt_lyt"
            app:layout_constraintTop_toBottomOf="@+id/patient"
            app:layout_constraintStart_toStartOf="parent"
            android:layout_width="match_parent"
            android:layout_height="51dp"
            android:layout_marginTop="15dp"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp">
            <AutoCompleteTextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/autocomplete"
                android:inputType="textAutoComplete"
                android:completionThreshold="1"
                android:singleLine="true"
                android:gravity="bottom"
                android:hint="Name"
                android:textSize="14dp"
                android:paddingRight="20dp"
                android:textColor="@android:color/black"/>
        </android.support.design.widget.TextInputLayout>

        <View
            android:id="@+id/topview_of_logout"
            app:layout_constraintTop_toBottomOf="@+id/collector_name_txt_lyt"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="#000000"
            android:layout_marginTop="30dp"/>

        <View
            android:id="@+id/midview_of_logout"
            app:layout_constraintTop_toBottomOf="@+id/topview_of_logout"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            android:layout_width="1dp"
            android:layout_height="37dp"
            android:layout_marginLeft="1dp"
            android:layout_marginRight="1dp"
            android:background="@android:color/black"/>

        <Button
            android:id="@+id/btnCancel"
            app:layout_constraintTop_toBottomOf="@+id/topview_of_logout"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/midview_of_logout"
            android:layout_width="0dp"
            android:layout_height="43dp"
            android:background="@null"
            android:text="Cancel"
            android:textAllCaps="false"
            android:textSize="12dp"/>

        <Button
            android:id="@+id/btnOk"
            app:layout_constraintTop_toBottomOf="@+id/topview_of_logout"
            app:layout_constraintStart_toEndOf="@+id/midview_of_logout"
            app:layout_constraintEnd_toEndOf="parent"
            android:layout_width="0dp"
            android:layout_height="43dp"
            android:text="Submit"
            android:textSize="12dp"
            android:textColor="@android:color/black"
            android:textAllCaps="false"
            android:background="@android:color/white"/>

    </android.support.constraint.ConstraintLayout>
</FrameLayout>

Step 5. Next, openMainActivity.cs and add the following code to Invoke the popup dialog in the UI. For that, open Solution Explorer >> MainActivity.cs. This page code is given below. In that code, we are initializing the Alert Dialog object and setting up the layout. We can access the layout widget properties by using the “window.FindViewById<TextView>(Resource.Id.widgetId)”, otherwise you’re trying to access directly, NullException will be thrown.

using Android.App;
using Android.OS;
using Android.Support.V7.App;
using Android.Views;
using Android.Widget;
using static Android.App.ActionBar;

namespace CustomPopupLayout
{
    [Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true)]
    public class MainActivity : AppCompatActivity
    {
        private Button btnshowPopup;
        private Button btnPopupCancel;
        private Button btnPopOk;
        private Dialog popupDialog;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);
            btnshowPopup = FindViewById<Button>(Resource.Id.btnPopup);
            btnshowPopup.Click += BtnshowPopup_Click;
        }

        private void BtnshowPopup_Click(object sender, System.EventArgs e)
        {
            popupDialog = new Dialog(this);
            popupDialog.SetContentView(Resource.Layout.activity_main);
            popupDialog.Window.SetSoftInputMode(SoftInput.AdjustResize);
            popupDialog.Show();

            // Some Time Layout width not fit with windows size
            // but Below lines are not necessary
            popupDialog.Window.SetLayout(LayoutParams.MatchParent, LayoutParams.WrapContent);
            popupDialog.Window.SetBackgroundDrawableResource(Android.Resource.Color.Transparent);

            // Access Popup layout fields like below
            btnPopupCancel = popupDialog.FindViewById<Button>(Resource.Id.btnCancel);
            btnPopOk = popupDialog.FindViewById<Button>(Resource.Id.btnOk);

            // Events for that popup layout
            btnPopupCancel.Click += BtnPopupCancel_Click;
            btnPopOk.Click += BtnPopOk_Click;

            // Some Additional Tips
            // Set the dialog Title Property - popupDialog.Window.SetTitle("Alert Title");
        }

        private void BtnPopOk_Click(object sender, System.EventArgs e)
        {
            popupDialog.Dismiss();
            popupDialog.Hide();
        }

        private void BtnPopupCancel_Click(object sender, System.EventArgs e)
        {
            popupDialog.Dismiss();
            popupDialog.Hide();
        }
    }
}

Additional Tip

Here, you can easily set the alert dialog Title by using the “AlertDialog.SetTitle” property.

Step 6. Now run your Xamarin Android, your output will look like the below.

Xamarin Android

Download Source Github

Conclusion

Finally, we have successfully created a custom dialog, I hope it's helpful. If you have any suggestions feel free to write in the comments section.

1 Comment

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Chris Drosos6y ago
Hello, thanks for this tutorial but you dont show how from BtnPopOk_Click we can access autocomplete value (android.support.design.widget.TextInputLayout) and also how we can give a default value to autocomplete textview programmatically (so if we enter something and press ok and open the dialog again, the previous value should exist on autocomplete)