How to translate texts into different languages (English, German, Arabic, Korean) in your Android App using ML Kit?

In this video it shows the steps to implement and use google’s ML Kit to translate languages in your Android App.

It refers to google developers page to get the required implementation for this App’s development:
https://developers.google.com/ml-kit/language/translation/android#java

I hope you like this video. For any questions, suggestions or appreciation please contact us at: https://programmerworld.co/contact/ or email at: programmerworld1990@gmail.com

This App is also published on Play store at:
https://play.google.com/store/apps/details?id=com.programmerworld.translatorapp

Complete source code and other details:

package com.programmerworld.translatorapp;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.mlkit.common.model.DownloadConditions;
import com.google.mlkit.nl.translate.TranslateLanguage;
import com.google.mlkit.nl.translate.Translation;
import com.google.mlkit.nl.translate.Translator;
import com.google.mlkit.nl.translate.TranslatorOptions;

public class MainActivity extends AppCompatActivity {

    private EditText editText;
    private TextView textView;

    private Translator translatorGerman;
    private Translator translatorArabic;
    private Translator translatorKorean;

    private Boolean booleanGerman = false;
    private Boolean booleanArabic = false;
    private Boolean booleanKorean = false;

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

        editText = findViewById(R.id.editText);
        textView = findViewById(R.id.textView);


        TranslatorOptions translatorOptionsGerman = new TranslatorOptions.Builder()
                .setSourceLanguage(TranslateLanguage.ENGLISH)
                .setTargetLanguage(TranslateLanguage.GERMAN)
                .build();

        TranslatorOptions translatorOptionsArabic = new TranslatorOptions.Builder()
                .setSourceLanguage(TranslateLanguage.ENGLISH)
                .setTargetLanguage(TranslateLanguage.ARABIC)
                .build();

        TranslatorOptions translatorOptionsKorean = new TranslatorOptions.Builder()
                .setSourceLanguage(TranslateLanguage.ENGLISH)
                .setTargetLanguage(TranslateLanguage.KOREAN)
                .build();

        translatorGerman = Translation.getClient(translatorOptionsGerman);
        translatorArabic = Translation.getClient(translatorOptionsArabic);
        translatorKorean = Translation.getClient(translatorOptionsKorean);

     downloadModel();
    }

    private void downloadModel(){
        DownloadConditions downloadConditions = new DownloadConditions.Builder()
                .requireWifi()
                .build();

        translatorGerman.downloadModelIfNeeded(downloadConditions)
                .addOnSuccessListener(new OnSuccessListener<Void>() {
                    @Override
                    public void onSuccess(Void unused) {
                        booleanGerman = true;
                    }
                })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        booleanGerman = false;
                    }
                });

        translatorArabic.downloadModelIfNeeded(downloadConditions)
                .addOnSuccessListener(new OnSuccessListener<Void>() {
                    @Override
                    public void onSuccess(Void unused) {
                        booleanArabic = true;
                    }
                })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        booleanArabic = false;
                    }
                });

        translatorKorean.downloadModelIfNeeded(downloadConditions)
                .addOnSuccessListener(new OnSuccessListener<Void>() {
                    @Override
                    public void onSuccess(Void unused) {
                        booleanKorean = true;
                    }
                })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        booleanKorean = false;
                    }
                });
    }

    public void buttonDownloadModel(View view){
        downloadModel();
    }

    public void buttonGerman(View view){

        if (booleanGerman){
            translatorGerman.translate(editText.getText().toString())
                    .addOnSuccessListener(new OnSuccessListener<String>() {
                        @Override
                        public void onSuccess(String s) {
                            textView.setText(s);
                        }
                    })
                    .addOnFailureListener(new OnFailureListener() {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                            textView.setText(e.toString());
                        }
                    });
        }
    }

    public void buttonArabic(View view){

        if (booleanGerman){
            translatorArabic.translate(editText.getText().toString())
                    .addOnSuccessListener(new OnSuccessListener<String>() {
                        @Override
                        public void onSuccess(String s) {
                            textView.setText(s);
                        }
                    })
                    .addOnFailureListener(new OnFailureListener() {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                            textView.setText(e.toString());
                        }
                    });
        }
    }

    public void buttonKorean(View view){
        if (booleanGerman){
            translatorKorean.translate(editText.getText().toString())
                    .addOnSuccessListener(new OnSuccessListener<String>() {
                        @Override
                        public void onSuccess(String s) {
                            textView.setText(s);
                        }
                    })
                    .addOnFailureListener(new OnFailureListener() {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                            textView.setText(e.toString());
                        }
                    });
        }
    }
}

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

    <TextView
        android:id="@+id/textView"
        android:layout_width="238dp"
        android:layout_height="99dp"
        android:text="Hello World!"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.4" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="219dp"
        android:layout_height="56dp"
        android:layout_marginStart="91dp"
        android:layout_marginTop="59dp"
        android:ems="10"
        android:hint="English Text here ..."
        android:inputType="textPersonName"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="22dp"
        android:layout_marginTop="39dp"
        android:onClick="buttonGerman"
        android:text="German"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="40dp"
        android:layout_marginTop="40dp"
        android:onClick="buttonArabic"
        android:text="Arabic"
        app:layout_constraintStart_toEndOf="@+id/button"
        app:layout_constraintTop_toBottomOf="@+id/editText" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="47dp"
        android:layout_marginTop="41dp"
        android:onClick="buttonKorean"
        android:text="Korean"
        app:layout_constraintStart_toEndOf="@+id/button2"
        app:layout_constraintTop_toBottomOf="@+id/editText" />

    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="212dp"
        android:layout_marginTop="8dp"
        android:onClick="buttonDownloadModel"
        android:text="Download Model"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

plugins {
    id 'com.android.application'
}

android {
    compileSdk 32

    defaultConfig {
        applicationId "com.programmerworld.translatorapp"
        minSdk 32
        targetSdk 32
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.4.1'
    implementation 'com.google.android.material:material:1.6.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

    implementation 'com.google.mlkit:translate:17.0.0'
}

No changes in Manifest or any other file required.