Acitvity

package ca.roumani.piglatin;

import android.speech.tts.TextToSpeech;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.util.Locale;

public class PigLatinActivity extends AppCompatActivity implements TextToSpeech.OnInitListener
{
    PigLatinModel model = new PigLatinModel();
    TextToSpeech tts;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        this.tts = new TextToSpeech(this, this);
        new PigLatinModel();
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_pig_latin);
    }

    public void buttonClicked(View v)
    {
        say(model.getPig());
    }

    public void buttonClicked2(View v)
    {
        ((EditText) findViewById(R.id.input)).setText("");
    }
    public void buttonClicked3(View v)
    {
       String word = ((EditText) findViewById(R.id.input)).getText().toString();
        model.setEnglish(word);
        String result = model.getPig();
        ((TextView) findViewById(R.id.convertedText)).setText(result);
        say(model.getEnglish());
    }

    @Override
    public void onInit(int initStatus)
    {
        if (initStatus != TextToSpeech.ERROR)
        {
            if (tts.isLanguageAvailable(Locale.US) == TextToSpeech.LANG_AVAILABLE)
            {
                tts.setLanguage(Locale.US);
            }
        } else
        {
            Toast.makeText(this, "Text To Speech failed...", Toast.LENGTH_LONG).show();
        }
    }
    public void say(String s)
    {
        if (tts != null)
        {
            Toast.makeText(getApplicationContext(), s, Toast.LENGTH_SHORT).show();
            tts.speak(s, TextToSpeech.QUEUE_FLUSH, null);
        }
    }
}


Model

package ca.roumani.piglatin;

import java.util.StringTokenizer;

/**
 * Created by user on 3/14/17.
 */
public class PigLatinModel
{
    private String english;
    private String pig;

    public PigLatinModel(){ this.setEnglish("");}
    public PigLatinModel(String text){this.setEnglish(text);}
    public String getEnglish(){return this.english;}
    public void setEnglish(String text){
        this.english = text.toLowerCase();
        this.translate();
    }
    public String getPig(){ return this.pig;}
    public void translate(){
        StringTokenizer st = new StringTokenizer(this.english);
        String result = "";
        while(st.hasMoreTokens())
        {
            String word = st.nextToken();
            String pig = this.translate(word);
            if(result.length()==0)
            {
                result = pig;
            }else{
                result = result + " " + pig;
            }
            this.pig = result;
        }
    }
    private String translate(String word){
        if(word.isEmpty())return word;
        String result = word;
        String[] vowels = {"a","e","i","o","u"};
        boolean Vowelcheck = false;
        int index = -1;
        for(int i = 0;i<vowels.length;i++){
            if(result.contains(vowels[i])){
                if(index >= 0){
                    if (index > result.indexOf(vowels[i])){
                        index = result.indexOf(vowels[i]);
                    }
                }else{
                    index = result.indexOf(vowels[i]);
                }
                Vowelcheck = true;
            }
        }
        if(Vowelcheck){
            if(index == 0){
                result = word +"way";
            }else{
                result = word.substring(index) + word.substring(0,index)+ "ay";
            }
        }else{
            result = word +"ay";
        }
        return result;
    }
    public static void main(String[] args) {
        PigLatinModel pigLatinModel = new PigLatinModel();
        System.out.println(pigLatinModel.translate("this"));
        System.out.println(pigLatinModel.translate("is"));
        System.out.println(pigLatinModel.translate("a"));
        System.out.println(pigLatinModel.translate("test"));
        System.out.println(pigLatinModel.translate("This is a test"));
    }

}


XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="ca.roumani.piglatin.PigLatinActivity">

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/input"
        android:layout_alignParentTop="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_marginTop="170dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/speak"
        android:id="@+id/speakButton"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:onClick="buttonClicked"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/clear"
        android:id="@+id/button"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:onClick="buttonClicked2"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/convert"
        android:id="@+id/convertButton"
        android:layout_alignBottom="@+id/button"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:onClick="buttonClicked3"/>

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/input"
        android:layout_centerHorizontal="true"
        android:layout_above="@+id/speakButton">

        <ScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/scrollView"
            android:fillViewport="true">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/convertedText"/>
        </ScrollView>
    </LinearLayout>

</RelativeLayout>