How to create a personal voice assistant Android App to create a text file? – complete source code

In this video it shows the steps to create a personal voice assistant Android App.

It shows a very basic logic in which a file is created by the App automatically whenever a user says create to it.

The App uses TextToSpeech API to speak to the user for the inputs it requires. SpeehRecognizer API is used to capture the inputs spoken by the user.

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Installation of the App (APK file) in a real phone – screenshots:

Testing of the App on the real phone – screenshots

Source Code:

package com.example.mypersonalvoiceassitance;

import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Environment;
import android.speech.RecognitionListener;
import android.speech.RecognizerIntent;
import android.speech.SpeechRecognizer;
import android.speech.tts.TextToSpeech;
import android.view.View;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import java.io.File;
import java.io.FileWriter;
import java.util.ArrayList;

import static android.Manifest.permission.READ_EXTERNAL_STORAGE;
import static android.Manifest.permission.RECORD_AUDIO;
import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;

public class MainActivity extends AppCompatActivity {

    private SpeechRecognizer speechRecognizer;
    private TextToSpeech textToSpeech;
    private TextView textView;
    private Intent intent;

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

        ActivityCompat.requestPermissions(this, new String[]{RECORD_AUDIO, WRITE_EXTERNAL_STORAGE, READ_EXTERNAL_STORAGE}, PackageManager.PERMISSION_GRANTED);
        textView = findViewById(R.id.textView);
        textToSpeech = new TextToSpeech(this, new TextToSpeech.OnInitListener() {
            @Override
            public void onInit(int status) {
            }
        });

        intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
        intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);

        speechRecognizer = SpeechRecognizer.createSpeechRecognizer(this);
        speechRecognizer.setRecognitionListener(new RecognitionListener() {
            @Override
            public void onReadyForSpeech(Bundle params) {
            }
            @Override
            public void onBeginningOfSpeech() {
            }
            @Override
            public void onRmsChanged(float rmsdB) {
            }
            @Override
            public void onBufferReceived(byte[] buffer) {
            }
            @Override
            public void onEndOfSpeech() {
            }
            @Override
            public void onError(int error) {
            }
            @Override
            public void onResults(Bundle results) {
                ArrayList<String> matches = results.getStringArrayList(speechRecognizer.RESULTS_RECOGNITION);
                String string = "";
                textView.setText("");
                if (matches != null){
                    string = matches.get(0);
                    textView.setText(string);

                    if (string.equals("create")){
                        createMethod();
                    }
                }
            }
            @Override
            public void onPartialResults(Bundle partialResults) {
            }
            @Override
            public void onEvent(int eventType, Bundle params) {
            }
        });
    }

    public void startButton(View view){
        textToSpeech.speak("Please tell me, how can I help you?", TextToSpeech.QUEUE_FLUSH, null, null);
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        speechRecognizer.startListening(intent);
    }

    private void createMethod(){
        File file = new File(Environment.getExternalStorageDirectory() + File.separator + "PersonalAssistant.txt");
        try {
            if (!file.exists()){
                file.createNewFile();
            }
            FileWriter fileWriter = new FileWriter(file);
            fileWriter.append("My 1st Personal voice assistance App development");
            fileWriter.flush();
            fileWriter.close();
        }
        catch (Exception e){
            e.printStackTrace();
            return;
        }
        textToSpeech.speak("The text file has been created. Thank you for using my service.", TextToSpeech.QUEUE_FLUSH, null, null);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.mypersonalvoiceassitance">

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.RECORD_AUDIO"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

<?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="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="153dp"
        android:layout_marginTop="98dp"
        android:onClick="startButton"
        android:text="@string/start"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>