speech to text kotlin android

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Speech to Text Application in Android with Kotlin

Speech to Text is seen in many applications such as Google search. With the help of this feature, the user can simply speak the query he wants to search. The text format of that speech will be automatically generated in the search bar. In this article, we will be taking a look at How to implement Speech Text in Android applications using Kotlin. 

Note : If you want to implement speech to text in android application using java, Check out the following article: Speech to Text in Android using Java

Step by Step Implementation

Step 1: Create a New Project in Android Studio

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio . Note that select Kotlin as the programming language.

Step 2: Add mic image in drawable folder

Navigate to the app > res > drawable > Right-click on it. Then click on New > Vector Asset. After that click on the clip art icon. Inside that simply search for the mic icon and we will get to see the icon. After that, we will have to rename the icon as ic_mic. After adding this simply click on Finish to add this icon to the drawable folder. 

Step 3: Working with the activity_main.xml file

Navigate to the app > res > layout > activity_main.xml and add the below code to that file. Below is the code for the activity_main.xml file. Comments are added inside the code to understand the code in more detail.

Step 4: Working with the MainActivity.kt file

Go to the MainActivity.kt file and refer to the following code. Below is the code for the MainActivity.kt file. Comments are added inside the code to understand the code in more detail.

Now run your application to see the output of it. 

Output: 

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Posted on May 30, 2020

Speech-to-text and Text-to-speech with Android

Have you ever wondered how does Google's speech search work, or ever thought of building an ebook narration app? At the first glance it might seem some complex piece of technology. While it is complicated to implement it on your own, thankfully Android (via Google Services) has built in speech-to-text and text-to-speech APIs which make it extremely easy to setup these features.

See it in action

How does this work?

For Speech-to-text, Android provides an Intent based API which launches Google's Speech Recognition service and returns back the text result to you. There is a catch though - the device will require Google Search app for the service to work.

The Text-to-speech API, unlike Speech Recognition, is available without Google Services, and can be found in android.speech.tts package.

Source code

You can find the source of this tutorial on GitHub .

Let's develop!

Fire up Android Studio and create a project with a Blank Activity.

User interface

The user interface is going to be simple - a LinearLayout as the root view group, inside wich there will be a Button which launches the Speech Recognition API, an EditText that shows the Speech Recognition output as well as serves as input to Text-to-speech functionality, and another Button to trigger Text-to-speech output.

The resultant XML file is as follows:

Setting up speech recognition

The Speech Recognition API comes bundled with the Google Search app, and can be launched using an Intent. The result of this Intent holds the recognized text, which can be extracted from the result intent in onActivityResult .

All the code beyond here is in Kotlin.

Firstly, let's define our request code constant.

Then, we'll attach an onClickListener to our button, in which we will construct and launch the Speech Recognition Intent .

The above code will launch the Speech Recognition API. But how do we get the result? We'll override the activity's onActivityResult and get the recognized text.

At this point, if your run your code, you will be able to use the Speech Recognition.

Setting up Text-to-speech

Unlike Speech Recognition API, Text-to-speech has it own class and doesn't run on Intents. We'll start off by creating a TextToSpeech object. The TextToSpeech class constructor expects a Context and an OnInitListener .

Then, we'll set an OnClickListener to our TTS button and call the text-to-speech API on our input text.

As a safety measure and to prevent memory leaks, we must override onPause and onDestroy methods and appropriately stop or shutdown the TextToSpeech object.

And that's it. Give it a try!

Closing Thoughts

With the standard APIs, Speech Recognition (or Speech-to-text) and Text-to-speech in Android is extremely easy to implement. While this might suffice most use cases, some advanced use cases would require more sophisticated third-party APIs or a custom implementation in your backend. We'll probably cover that sometime later.

Until then, keep coding, and as always do let me know if you have any questions in the comments section!

Top comments (5)

Templates let you quickly answer FAQs or store snippets for re-use.

• Joined Jan 16, 2021

Thx for article, but I still have some questions: How make speech recognition, which would be return recognized words in Set? How to make permanent voice recognition until the user turns it off? And how to remove google activity when it recognize speech, I want to show all words in text inside my app

• Email [email protected]
• Location Pune, India
• Education Bachelor of Computer Engineering
• Work Software Engineer
• Joined May 5, 2020

Hey @samartinell

By default, speech recognition returns a string, you could do a String.split() call on on with a regex that identifies words as per your preference. This will give you a list of words.

For permanent voice recognition, you will have to play with Recognition. The trick is to listen to when the speech recognition ends and then restart it. If you don't want the Google Dialog while recognizing speech, and also keep an always on speech recognition feature, check out this answer on StackOverflow, might help: stackoverflow.com/a/45833487

Do let the community here know if it worked for you!

Thank you very much! I'm already found how recognize speech without google dialog and how split string to set. Now i'm gonna try your way to permanent recognition

• Work Android developer
• Joined Jan 20, 2022

Thank you for the details, is it possible to use it while recording videos with audio ? With Android cameraX?

• Joined Sep 1, 2021

Can we add custom words to help better recognise words

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speech-to-text-android

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The Speech Recognition or Speech-to-Text Converter module in Android, implemented using Kotlin, facilitates the conversion of spoken language into written text

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