How to create a MultiChoice AlertDialog in Android

In this tutorial we will create a Multiple Choice Alert Dialog using android studio. We will show list of colors to show in dialog. We will create a button to show that AlertDialog, and a TextView to show the selected items...

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="Preferred colors"
        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 {

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

        final TextView textView = findViewById(R.id.txtView);
        Button showDialogBtn = findViewById(R.id.showsnackbarbtn);
        showDialogBtn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {

                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                // String array for alert dialog multi choice items
                String[] colorsArray = new String[]{"Black", "Orange", "Green", "Yellow", "White", "Purple"};
                // Boolean array for initial selected items
                final boolean[] checkedColorsArray = new boolean[]{
                        true, // Black checked
                        false, // Orange
                        false, // Green
                        true, // Yellow checked
                        false, // White
                        false  //Purple
                };
                // Convert the color array to list
                final List<String> colorsList = Arrays.asList(colorsArray);
                //setTitle
                builder.setTitle("Select colors");
                //set multichoice
                builder.setMultiChoiceItems(colorsArray, checkedColorsArray, new DialogInterface.OnMultiChoiceClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                        // Update the current focused item's checked status
                        checkedColorsArray[which] = isChecked;
                        // Get the current focused item
                        String currentItem = colorsList.get(which);
                        // Notify the current action
                        Toast.makeText(getApplicationContext(), currentItem + " " + isChecked, Toast.LENGTH_SHORT).show();
                    }
                });
                // Set the positive/yes button click listener
                builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // Do something when click positive button
                        textView.setText("Your preferred colors..... \n");
                        for (int i = 0; i<checkedColorsArray.length; i++){
                            boolean checked = checkedColorsArray[i];
                            if (checked) {
                                textView.setText(textView.getText() + colorsList.get(i) + "\n");
                            }
                        }
                    }
                });
                // Set the neutral/cancel button click listener
                builder.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // Do something when click the neutral button
                    }
                });
                AlertDialog dialog = builder.create();
                // Display the alert dialog on interface
                dialog.show();

            }
        });


    }




}

Step3: Output