Android MultiChoice AlertDialog

Alert dialog is a subclass of dialog class ,In MultiChoice AlertDialog the content area of dialog contains list of items allowing users to select one or more options from a set .

1. MultiChoice AlertDialog contains list of item with Text and Checkbox .
2. To specify the items for the list, call setMultiChoiceItems  by passing an array of String for text to display and  array of boolean values to display checked and unchecked status for respective items.

Optionally you can set title ,icon ,message for the alertDialog .

XML Layout

Create XML Layout activity_main.xml , this will be set as content view for launcher Activity (MainActivity.kt) .

file : activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:padding="30dp"
        tools:context=".MainActivity">

    <androidx.appcompat.widget.AppCompatButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="show MultiChoice Dialog"
            android:textSize="20sp"
            android:textAllCaps="false"
            android:onClick="multiChoiceDialog"/>
    
</LinearLayout>

 Activity

1. Create a koltin class MainActivity.kt and extend it to AppCompatActivity class .
2. Override onCreate function and set the content of this MainActivity with above defined xml layout (activity_main.xml).

file : MainActivity.kt

package com.tutorialsbuzz.multichoicealertdialog

import android.content.DialogInterface
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.view.View
import android.widget.Toast
import androidx.appcompat.app.AlertDialog

class MainActivity : AppCompatActivity() {

    val multiChoiceList = linkedMapOf<String, Boolean>(
        "English" to false,
        "Hindi" to false,
        "French" to false,
        "Spanish" to false,
        "Portuguese" to false,
        "German" to false,
        "Italian" to false,
        "Korean" to false,
        "Japanese" to false,
        "Chinese" to false
    )

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }

    fun multiChoiceDialog(view: View) {

        val builder = AlertDialog.Builder(this)
        builder.setTitle("Select Languages")

        builder.setMultiChoiceItems(multiChoiceList.keys.toTypedArray(),
            multiChoiceList.values.toBooleanArray(), { dialogInterface, which, isChecked ->

                multiChoiceList.set(multiChoiceList.keys.toTypedArray().get(which), isChecked)

                val status = if (isChecked) {
                    " :is checked"
                } else {
                    " :is un-checked"
                }

                Toast.makeText(
                    this@MainActivity,
                    "item: " + multiChoiceList.keys.toTypedArray().get(which) + status, Toast.LENGTH_SHORT
                ).show()

            })

        builder.setPositiveButton("ok", DialogInterface.OnClickListener { dialog, id ->
            Log.d("Selected Items", multiChoiceList.toString())
            dialog.dismiss()
        })
        builder.setNegativeButton("cancel", { dialog, id ->
            dialog.dismiss()
        })

        val alertDialog = builder.create()
        alertDialog.show()
    }

}

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