MultiRowsRadioGroup is a RadioGroups container with different columns or rows

activity_radio_group.xml

<?xml version="1.0" encoding="utf-8"?>
<your.project.package.MultiRowsRadioGroup xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/multiRowsRadioGroup_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <RadioGroup
        android:id="@+id/radioGroup1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="AAA" />

        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="AAA" />

        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="AAA" />
    </RadioGroup>

    <RadioGroup
        android:id="@+id/radioGroup2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="BBB" />


        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="BBB" />
    </RadioGroup>

    <RadioGroup
        android:id="@+id/radioGroup3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="CCC" />

        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="CCC" />
    </RadioGroup>

</your.project.package.MultiRowsRadioGroup>

MultiRowsRadioGroup.kt

package your.project.package

import android.content.Context
import android.util.AttributeSet
import android.view.View
import android.view.ViewGroup
import android.widget.LinearLayout
import android.widget.RadioGroup


/**
 * Created by Avishay.Peretz on 05/12/2019.
 */
class MultiRowsRadioGroup @JvmOverloads constructor(
        context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : LinearLayout(context, attrs, defStyleAttr) {

    private var isChecking: Boolean = false
    private var mCheckedId: Int = -1

    private lateinit var radioGroupCheckedChangedListener: RadioGroup.OnCheckedChangeListener

    private var checkedChangedListener: OnCheckedChangeListener? = null

    init {
        initRadioGroupListener()
    }

    
    override fun addView(child: View?, index: Int, params: ViewGroup.LayoutParams?) {
        super.addView(child, index, params)
        setRadioGroupListener(child)
    }

    private fun setRadioGroupListener(view: View?) {
        if (view != null && view is RadioGroup) {
            view.setOnCheckedChangeListener(radioGroupCheckedChangedListener)
        }
    }


    private fun initRadioGroupListener() {
        radioGroupCheckedChangedListener = RadioGroup.OnCheckedChangeListener { group, checkedId ->
            if (checkedId != -1 && !isChecking) {
                isChecking = true

                val size = childCount
                for (i in 0 until size) {
                    val view = getChildAt(i)
                    if (view is RadioGroup) {
                        if (view != group) {
                            view.clearCheck()
                        }
                    }
                }

                mCheckedId = checkedId
                checkedChangedListener?.onCheckedChanged(group, checkedId)

                isChecking = false
            }
        }
    }

    fun setOnCheckedChangeListener(onCheckedChangeListener: OnCheckedChangeListener?) {
        checkedChangedListener = onCheckedChangeListener
    }

}


interface OnCheckedChangeListener {
    fun onCheckedChanged(group: RadioGroup, checkedId: Int)
}

RadioGroupActivity.kt

package your.project.package


import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.RadioGroup
import android.widget.Toast

class RadioGroupActivity : AppCompatActivity() {

    private lateinit var multiRowsRadioGroup: MultiRowsRadioGroup

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

        multiRowsRadioGroup = findViewById(R.id.multiRowsRadioGroup_container)
        multiRowsRadioGroup.setOnCheckedChangeListener(object : OnCheckedChangeListener {
            override fun onCheckedChanged(group: RadioGroup, checkedId: Int) {
                Toast.makeText(applicationContext, "groupId = ${group.id}\ncheckedId = $checkedId", Toast.LENGTH_SHORT).show()
            }
        })
    }

    override fun onDestroy() {
        multiRowsRadioGroup.setOnCheckedChangeListener(null)
        super.onDestroy()
    }
}

#Android #Kotlin #RadioGroup

git repo: https://github.com/avisper/EasyCompoundButtonGroup