How to create a SingleChoice AlertDialog in Android

In this tutorial we will create alert dialog with single choice from list of items. We will create a button that show alert dialog when that button is clicked, a TextView that shows the selected item from dialog.

Step 1: Create a new project OR Open your project

Step 2: Code

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:padding="20dp"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/showsnackbarbtn"
        android:text="Show Alert Dialog"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/txtView"
        android:text="Selected Item"
        android:textSize="20sp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

MainActivity.java

package com.blogspot.devofandroid.myapplication;


import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    String[] listItems;

    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final TextView textView = findViewById(R.id.txtView);
        Button showDialog = findViewById(R.id.showsnackbarbtn);
        showDialog.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                listItems = new String[]{"Item 1", "Item 2", "Item 3"};
                AlertDialog.Builder mBuilder = new AlertDialog.Builder(MainActivity.this);
                mBuilder.setTitle("Choose an item");
                mBuilder.setSingleChoiceItems(listItems, -1, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        textView.setText(listItems[i]);
                        dialogInterface.dismiss();
                    }
                });
                // Set the neutral/cancel button click listener
                mBuilder.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // Do something when click the neutral button
                        dialog.cancel();
                    }
                });

                AlertDialog mDialog = mBuilder.create();
                mDialog.show();

            }
        });

    }

}

Step 3: Output