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
![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.