Android Language Change example kotlin

1/step :  Create A New Project and add this code in activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tvWelcome"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/welcome_message"
        android:textSize="20sp" />

    <Button
        android:id="@+id/btnChangeLanguage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:text="@string/change_language" />
</LinearLayout>

2/Step : Add the res/values/strings.xml

<resources>
    <string name="app_name">Language Change</string>
    <string name="welcome_message">স্বাগতম</string>
    <string name="change_language">ভাষা পরিবর্তন করুন</string>
</resources>

3/Step :  Add the code in MainActivity

package com.alomkaisa.myapplication

import android.content.Context
import android.content.Intent
import android.content.SharedPreferences
import android.os.Bundle
import android.widget.Button
import androidx.activity.enableEdgeToEdge
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.ViewCompat
import androidx.core.view.WindowInsetsCompat
import java.util.Locale

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)


        val savedLanguage = getSavedLanguage(this)
        setLocale(this, savedLanguage)

        setContentView(R.layout.activity_main)


        val btnChangeLanguage = findViewById<Button>(R.id.btnChangeLanguage)


        btnChangeLanguage.setOnClickListener {

            val newLanguage = if (getSavedLanguage(this) == "en") "bn" else "en"
            setLocale(this, newLanguage)
            saveLanguagePreference(this, newLanguage)

            // Restart activity to apply the language change
            val intent = Intent(this, MainActivity::class.java)
            finish()
            startActivity(intent)
        }
    }


    private fun setLocale(context: Context, language: String) {
        val locale = Locale(language)
        Locale.setDefault(locale)
        val resources = context.resources
        val config = resources.configuration
        config.setLocale(locale)
        resources.updateConfiguration(config, resources.displayMetrics)
    }


    private fun saveLanguagePreference(context: Context, language: String) {
        val preferences: SharedPreferences =
            context.getSharedPreferences("AppPreferences", Context.MODE_PRIVATE)
        preferences.edit().putString("SelectedLanguage", language).apply()
    }


    private fun getSavedLanguage(context: Context): String {
        val preferences: SharedPreferences =
            context.getSharedPreferences("AppPreferences", Context.MODE_PRIVATE)
        return preferences.getString("SelectedLanguage", "en") ?: "en"
    }
}