IBM Watson Developer Cloud Android SDK

Android client library to assist with using the Watson Developer Cloud services, a collection of REST APIs and SDKs that use cognitive computing to solve complex problems.

Table of Contents

• Installation
  • Gradle
• Usage
• Getting the Service Credentials
• Questions
• Examples
  • Speech to Text
  • Text to Speech
  • Visual Recognition
• License
• Contributing

Installation

Gradle

'com.ibm.watson.developer_cloud:android-sdk:0.1.0'

JAR

Download the jar with dependencies here.

---

Now, you are ready to see some examples.

Usage

The examples below assume that you already have service credentials. If not, you will have to create a service in Bluemix.

Getting the Service Credentials

You will need the username and password (api_key for AlchemyAPI) credentials for each service. Service credentials are different from your Bluemix account username and password.

To get your service credentials, follow these steps:

1. Log in to Bluemix at https://bluemix.net.

2. Create an instance of the service:

   1. In the Bluemix Catalog, select the service you want to use.
   2. Under Add Service, type a unique name for the service instance in the Service name field. For example, type my-service-name. Leave the default values for the other options.
   3. Click Create.

3. Copy your credentials:

   1. On the left side of the page, click Service Credentials to view your service credentials.
   2. Copy username and password(api_key for AlchemyAPI).

Questions

If you are having difficulties using the APIs or have a question about the IBM Watson Services, please ask a question on dW Answers or Stack Overflow.

The java-sdk is quite large. If you are encountering an error similar to

ClassNotFoundException: Didn't find class on path: DexPathList

or

Error converting bytecode to dex

it's possible you have exceeded the dex limit. To solve this you can enable Multidex Support. Information about enabling Multidex Support can be found on the Android Developers site.

Examples

This SDK is built for use with the java-sdk. The examples below are specific for Android as they use the Microphone and Speaker.

Speech to Text

Use the Speech to Text service to recognize the text from a .wav file.

SpeechToText service = new SpeechToText();
service.setUsernameAndPassword("<username>", "<password>");

File audio = new File("src/test/resources/sample1.wav");

SpeechResults transcript = service.recognize(audio, HttpMediaType.AUDIO_WAV).execute();
System.out.println(transcript);

WebSocket support

Speech to Text supports WebSocket, the url is:
wss://stream.watsonplatform.net/speech-to-text/api/v1/recognize

SpeechToText service = new SpeechToText();
service.setUsernameAndPassword("<username>", "<password>");

File audio = new File("src/test/resources/sample1.wav");

RecognizeOptions options = new RecognizeOptions();
options.continuous(true).interimResults(true).contentType(HttpMediaType.AUDIO_WAV);

service.recognizeUsingWebSocket(audio, options, new BaseRecognizeCallback() {
  @Override
  public void onTranscription(SpeechResults speechResults) {
    System.out.println(speechResults);
  }
);
// wait 20 seconds for the asynchronous response
Thread.sleep(20000);

Microphone Input Stream

Convience function for creating an InputStream from device microphone

InputStream myInputStream = new MicrophoneInputStream();

An example using a Watson Developer Cloud service would look like

speechService.recognizeUsingWebSocket(new MicrophoneInputStream(),
getRecognizeOptions(), new BaseRecognizeCallback() {
  @Override 
  public void onTranscription(SpeechResults speechResults){
    String text = speechResults.getResults().get(0).getAlternatives().get(0).getTranscript();
    System.out.println(text);
  }

  @Override
  public void onError(Exception e) {
  }

  @Override public void onDisconnected() {
  }

});

##StreamPlayer Provides the ability to directly play an InputStream

StreamPlayer player = new StreamPlayer();
player.playStream(yourInputStream);

Text to Speech

Use the Text to Speech service to get the available voices to synthesize.

TextToSpeech service = new TextToSpeech();
service.setUsernameAndPassword("<username>", "<password>");

List<Voice> voices = service.getVoices().execute();
System.out.println(voices);

##CameraHelper Provides simple camera access within an activity.

CameraHelper cameraHelper = new CameraHelper(this);
cameraHelper.dispatchTakePictureIntent();

@Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == CameraHelper.REQUEST_IMAGE_CAPTURE) {
      System.out.println(cameraHelper.getFile(resultCode));
    }
  }

###Visual Recognition Use the Visual Recognition service to recognize a picture.

@Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == CameraHelper.REQUEST_IMAGE_CAPTURE) {
      File image = cameraHelper.getFile(resultCode);
      VisualClassification result = visualRecognitionService.classify(image).execute();
      System.out.println(result);
    }
  }

##GalleryHelper Like the CameraHelper, but allows for selection of images already on the device.

To open the gallery:

GalleryHelper galleryHelper = new GalleryHelper(this);
galleryHelper.dispatchGalleryIntent();

@Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == GalleryHelper.PICK_IMAGE_REQUEST) {
      System.out.println(galleryHelper.getFile(resultCode));
    }
  }

Build + Test

Use Gradle (version 1.x) to build and test the project you can use .

Gradle:

$ cd android-sdk
$ gradle jar  # build jar file (build/libs/android-sdk-0.1.0.jar)
$ gradle test # run tests

Open Source @ IBM

Find more open source projects on the IBM Github Page

License

This library is licensed under Apache 2.0. Full license text is available in LICENSE.

Contributing

See CONTRIBUTING.md.