add multiple selection function

app/build.gradle

@@ -3,13 +3,13 @@ apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 
 android {
-    compileSdkVersion 29
-    buildToolsVersion "29.0.3"
+    compileSdkVersion 30
+    buildToolsVersion "30.0.2"
 
     defaultConfig {
         applicationId "com.wayne.constraintradiogroup.demo"
-        minSdkVersion 23
-        targetSdkVersion 29
+        minSdkVersion 14
+        targetSdkVersion 30
         versionCode 1
         versionName "1.0"
     }

app/src/main/java/com/wayne/constraintradiogroup/demo/MainActivity.kt

@@ -15,7 +15,8 @@ class MainActivity : AppCompatActivity() {
         crg_custom.checkedChangeListener = object : OnCheckedChangeListener {
             override fun onCheckedChanged(
                 group: ConstraintRadioGroup,
-                checkedButton: CompoundButton
+                checkedButton: CompoundButton,
+                isChecked: Boolean
             ) {
                 // TODO
 //                (checkedButton as RadioButton)
@@ -25,7 +26,8 @@ class MainActivity : AppCompatActivity() {
         crg_check_box.checkedChangeListener = object : OnCheckedChangeListener {
             override fun onCheckedChanged(
                 group: ConstraintRadioGroup,
-                checkedButton: CompoundButton
+                checkedButton: CompoundButton,
+                isChecked: Boolean
             ) {
                 // TODO
 //                (checkedButton as CheckBox)

build.gradle

@@ -1,14 +1,14 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
-    ext.kotlin_version = "1.3.72"
+    ext.kotlin_version = "1.4.10"
     repositories {
         google()
         jcenter()
     }
     dependencies {
-        classpath "com.android.tools.build:gradle:3.6.1"
+        classpath "com.android.tools.build:gradle:4.0.1"
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        classpath 'com.novoda:bintray-release:0.9.2'
+        classpath 'com.github.panpf.bintray-publish:bintray-publish:1.0.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

constraint-radiogroup/build.gradle

@@ -3,11 +3,11 @@ apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 30
 
     defaultConfig {
-        minSdkVersion 23
-        targetSdkVersion 29
+        minSdkVersion 14
+        targetSdkVersion 30
 
         consumerProguardFiles "consumer-rules.pro"
     }
@@ -24,7 +24,6 @@ dependencies {
     implementation fileTree(dir: "libs", include: ["*.jar"])
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
     implementation 'androidx.core:core-ktx:1.3.1'
-    implementation 'androidx.appcompat:appcompat:1.2.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
 }
 apply from: rootProject.file('publish.gradle')

constraint-radiogroup/src/main/java/com/wayne/constraintradiogroup/ConstraintRadioGroup.kt

@@ -9,15 +9,19 @@ import android.os.Build
 import android.util.AttributeSet
 import android.view.View
 import android.view.ViewGroup
+import android.widget.CheckBox
 import android.widget.CompoundButton
+import android.widget.RadioButton
 import androidx.constraintlayout.widget.ConstraintLayout
 import androidx.core.content.res.ResourcesCompat
+import androidx.core.view.children
 
 
 class ConstraintRadioGroup @JvmOverloads constructor(
     context: Context,
-    attrs: AttributeSet? = null
-) : ConstraintLayout(context, attrs) {
+    attrs: AttributeSet? = null,
+    defStyleAttr: Int = 0,
+) : ConstraintLayout(context, attrs, defStyleAttr) {
 
     var checkedChangeListener: OnCheckedChangeListener? = null
 
@@ -31,7 +35,9 @@ class ConstraintRadioGroup @JvmOverloads constructor(
     var unSelectedTextTypeface: Typeface? = null
         private set
 
-    private var checkedButton: CompoundButton? = null
+    private val checkedButtons: ArrayList<CompoundButton> = arrayListOf()
+
+    private var isMultiple: Boolean = false
 
     init {
         val typedArray = context.obtainStyledAttributes(attrs, R.styleable.ConstraintRadioGroup)
@@ -44,6 +50,8 @@ class ConstraintRadioGroup @JvmOverloads constructor(
         unSelectedTextColor =
             typedArray.getColor(R.styleable.ConstraintRadioGroup_unSelected_text_color, Color.BLACK)
 
+        isMultiple = typedArray.getBoolean(R.styleable.ConstraintRadioGroup_is_multiple_select, false)
+
         try {
             selectedTextTypeface = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                 typedArray.getFont(R.styleable.ConstraintRadioGroup_selected_font)
@@ -74,22 +82,38 @@ class ConstraintRadioGroup @JvmOverloads constructor(
 
     override fun addView(child: View?, index: Int, params: ViewGroup.LayoutParams?) {
         if (child is CompoundButton) {
-            if (child.isChecked) {
-                checkedButton = child
+            if (child.isChecked && checkedButtons.count { it is RadioButton } == 1) {
+                checkedButtons.add(child)
             }
             setCheckedStateForView(child, false)
 
             child.setOnCheckedChangeListener { buttonView, isChecked ->
-                setCheckedButton(buttonView)
+                setCheckedButton(buttonView, isChecked)
             }
         }
         super.addView(child, index, params)
     }
 
     override fun onFinishInflate() {
         super.onFinishInflate()
-        checkedButton?.let {
-            setCheckedStateForView(it, true)
+        if(children.all { it is RadioButton }) {
+            isMultiple = false
+            // Default choose first
+            checkedButtons.firstOrNull()?.let {
+                checkedButtons.clear()
+                checkedButtons.add(it)
+            }
+            checkedButtons.singleOrNull()?.let {
+                setCheckedStateForView(it, true)
+            }
+        } else if(!isMultiple) {
+            checkedButtons.singleOrNull()?.let {
+                setCheckedStateForView(it, true)
+            }
+        } else {
+            checkedButtons.forEach {
+                setCheckedStateForView(it, true)
+            }
         }
     }
 
@@ -104,18 +128,51 @@ class ConstraintRadioGroup @JvmOverloads constructor(
         compoundButton.isChecked = checked
     }
 
-    private fun setCheckedButton(compoundButton: CompoundButton) {
-        val changed = checkedButton != compoundButton
+    private fun setCheckedButton(compoundButton: CompoundButton, isChecked: Boolean) {
+        if(!isMultiple) {
+            val changed = checkedButtons.singleOrNull() != compoundButton
+
+            if (changed) {
+                checkedChangeListener?.onCheckedChanged(this, compoundButton, isChecked)
+
+                setCheckedStateForView(compoundButton, true)
+
+                checkedButtons.singleOrNull()?.let {
+                    setCheckedStateForView(it, false)
+                }
+                checkedButtons.clear()
+                checkedButtons.add(compoundButton)
+            } else if (compoundButton is CheckBox) {
+                checkedChangeListener?.onCheckedChanged(this, compoundButton, isChecked)
+                setCheckedStateForView(compoundButton, isChecked)
+                if (isChecked) {
+                    checkedButtons.clear()
+                    checkedButtons.add(compoundButton)
+                } else checkedButtons.remove(compoundButton)
+            }
+        } else {
+            if (compoundButton is RadioButton && children.count { it is RadioButton } > 1) {
+                val changed = checkedButtons.firstOrNull { it is RadioButton } != compoundButton
+
+                if (changed) {
+                    checkedChangeListener?.onCheckedChanged(this, compoundButton, isChecked)
+
+                    setCheckedStateForView(compoundButton, true)
 
-        if (changed) {
-            checkedChangeListener?.onCheckedChanged(this, compoundButton)
+                    checkedButtons.firstOrNull { it is RadioButton }?.let {
+                        setCheckedStateForView(it, false)
+                    }
+                    checkedButtons.removeAll { it is RadioButton }
+                    checkedButtons.add(compoundButton)
+                }
+            } else {
+                checkedChangeListener?.onCheckedChanged(this, compoundButton, isChecked)
 
-            setCheckedStateForView(compoundButton, true)
+                setCheckedStateForView(compoundButton, isChecked)
 
-            checkedButton?.let {
-                setCheckedStateForView(it, false)
+                if (isChecked) checkedButtons.add(compoundButton)
+                else checkedButtons.remove(compoundButton)
             }
-            checkedButton = compoundButton
         }
     }
 }

constraint-radiogroup/src/main/java/com/wayne/constraintradiogroup/OnCheckedChangeListener.kt

@@ -5,5 +5,5 @@ import androidx.annotation.IdRes
 
 
 interface OnCheckedChangeListener {
-    fun onCheckedChanged(group: ConstraintRadioGroup, checkedButton: CompoundButton)
+    fun onCheckedChanged(group: ConstraintRadioGroup, checkedButton: CompoundButton, isChecked: Boolean)
 }

constraint-radiogroup/src/main/res/values/attrs.xml

@@ -5,5 +5,6 @@
         <attr name="unSelected_font" format="reference"/>
         <attr name="selected_text_color" format="color|reference" />
         <attr name="unSelected_text_color" format="color|reference" />
+        <attr name="is_multiple_select" format="boolean" />
     </declare-styleable>
 </resources>

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.6.1-all.zip

publish.gradle

@@ -1,4 +1,4 @@
-apply plugin: 'com.novoda.bintray-release'
+apply plugin: 'com.github.panpf.bintray-publish'
 
 
 publish {