MainActivity.kt
package com.example.jetpack
import android.annotation.SuppressLint
import android.graphics.*
import android.os.Build
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.view.menu.MenuBuilder
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
@SuppressLint("RestrictedApi")
override fun onCreateOptionsMenu(menu: Menu?): Boolean {
menuInflater.inflate(R.menu.options_menu,menu)
// To display icon on overflow menu
if (menu is MenuBuilder) {
menu.setOptionalIconsVisible(true)
}
// change menu icon color programmatically
menu?.apply {
for(index in 0 until this.size()){
val item = this.getItem(index)
var color = Color.parseColor("#4F42B5")
when (item.itemId) {
R.id.red -> {
color = Color.RED
}
R.id.green -> {
color = Color.GREEN
}
R.id.yellow -> {
color = Color.YELLOW
}
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
item.icon.colorFilter = BlendModeColorFilter(
color, BlendMode.SRC_IN
)
}else{
item.icon.setColorFilter(color, PorterDuff.Mode.SRC_IN)
}
}
}
return super.onCreateOptionsMenu(menu)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
when(item.itemId){
R.id.red->{
textView.setTextColor(Color.RED)
}R.id.green->{
textView.setTextColor(Color.GREEN)
}R.id.yellow->{
textView.setTextColor(Color.YELLOW)
}
R.id.bold->{
item.isChecked = !item.isChecked
if (item.isChecked){
if (textView.typeface.isItalic){
textView.setTypeface(textView.typeface,Typeface.BOLD_ITALIC)
}else{
textView.setTypeface(textView.typeface,Typeface.BOLD)
}
}else{
if (textView.typeface.isItalic){
textView.setTypeface(textView.typeface,Typeface.ITALIC)
}else{
textView.setTypeface(textView.typeface,Typeface.NORMAL)
}
}
}
R.id.italic->{
item.isChecked = !item.isChecked
if (item.isChecked){
if (textView.typeface.isBold){
textView.setTypeface(textView.typeface,Typeface.BOLD_ITALIC)
}else{
textView.setTypeface(textView.typeface,Typeface.ITALIC)
}
}else{
if (textView.typeface.isBold){
textView.setTypeface(textView.typeface,Typeface.BOLD)
}else{
textView.setTypeface(textView.typeface,Typeface.NORMAL)
}
}
}
R.id.underline->{
item.isChecked = !item.isChecked
if (item.isChecked){
textView.paintFlags = textView.paintFlags or
Paint.UNDERLINE_TEXT_FLAG
}else{
textView.paintFlags = 0
}
}
}
return super.onOptionsItemSelected(item)
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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:id="@+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.google.android.material.textview.MaterialTextView
android:id="@+id/textView"
style="@style/TextAppearance.MaterialComponents.Headline4"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginEnd="16dp"
android:background="#F6F6F2"
android:padding="5dp"
android:text="Kotlin Checkable Menu Item Example"
android:typeface="monospace"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
res/menu/options_menu.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/red"
android:title="Red"
android:icon="@drawable/ic_color_lens"
app:showAsAction="always"
/>
<item
android:id="@+id/green"
android:title="Green"
android:icon="@drawable/ic_color_lens"
app:showAsAction="always"
/>
<item
android:id="@+id/yellow"
android:title="Yellow"
android:icon="@drawable/ic_color_lens"
app:showAsAction="always"
/>
<item
android:id="@+id/bold"
android:title="Bold"
android:icon="@drawable/ic_format_bold"
app:showAsAction="never"
android:checkable="true"
android:checked="false"
/>
<item
android:id="@+id/italic"
android:title="Italic"
android:icon="@drawable/ic_format_italic"
app:showAsAction="never"
android:checkable="true"
/>
<item
android:id="@+id/underline"
android:title="Underline"
android:icon="@drawable/ic_format_underlined"
app:showAsAction="never"
android:checkable="true"
/>
</menu>

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