In this tutorial i will show you how you can change your app language programmatically in android. It’s very important to make any application to support multi language. Multiple language support will help you to get more users to your app. Let’s jump into the main content.

1. Creating New Project in Android Studio
2. Add new resource file strings.xml
3. Code for main_activity.xml
4. Code for MainActivity.java

In Android Studio, Go to File Menu -> New Project -> and fill up the required information then click Finish.

Goto res folder and right click on it. Select New -> Android Resource File and follow the below image.

You can create many language as per your need.

Create a string entry for English locale

Create a string entry for Bangla locale

Add this code to activity_main.xml

<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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView

        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/love_text"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Add this code to MainActivity.java

package me.mehadih.multiplelanguage;

import androidx.appcompat.app.AppCompatActivity;

import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle;
import android.util.DisplayMetrics;

import java.util.Locale;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setApplicationLocale("bn");
        setContentView(R.layout.activity_main);

    }

    private void setApplicationLocale(String locale) {
        Resources resources = getResources();
        DisplayMetrics dm = resources.getDisplayMetrics();
        Configuration config = resources.getConfiguration();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            config.setLocale(new Locale(locale.toLowerCase()));
        } else {
            config.locale = new Locale(locale.toLowerCase());
        }
        resources.updateConfiguration(config, dm);
    }
}

Now run the app to view the changes.

Download Source Code From Here