Simple working test of IBM Watson Speech To Text capability on Android platform

activity_speech_to_text.xml

<?xml version="1.0" encoding="utf-8"?>

<!--

Copyright 2016 hendrawd

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

-->

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Halo!" />

    <Button
        android:id="@+id/button_record"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Start Record" />
</LinearLayout>

build.gradle

//put these dependencies in your app level build.gradle
dependencies {
    compile 'com.ibm.watson.developer_cloud:java-sdk:3.5.2'
    compile 'com.ibm.watson.developer_cloud:android-sdk:0.2.1'
}

SpeechToTextActivity.java

/**
 * Copyright (C) 2016 hendrawd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.ibm.mobileappbuilder.speechtotexttest20161215031450.R;
import com.ibm.watson.developer_cloud.android.library.audio.MicrophoneInputStream;
import com.ibm.watson.developer_cloud.android.library.audio.utils.ContentType;
import com.ibm.watson.developer_cloud.speech_to_text.v1.SpeechToText;
import com.ibm.watson.developer_cloud.speech_to_text.v1.model.RecognizeOptions;
import com.ibm.watson.developer_cloud.speech_to_text.v1.model.SpeechResults;
import com.ibm.watson.developer_cloud.speech_to_text.v1.websocket.BaseRecognizeCallback;

import java.io.InputStream;

/**
 * @author hendrawd on 12/15/16
 */

public class SpeechToTextActivity extends Activity {

    private Button buttonRecord;
    private TextView textView;
    private SpeechToText speechToTextService;
    private boolean listening = false;
    private InputStream inputStream;

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

        buttonRecord = (Button) findViewById(R.id.button_record);
        textView = (TextView) findViewById(R.id.text_view);

        speechToTextService = initSpeechToTextService();

        buttonRecord.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!listening) {
                    startRecord();
                } else {
                    stopRecord();
                }
            }
        });
    }

    private SpeechToText initSpeechToTextService() {
        SpeechToText speechToTextService = new SpeechToText();
        String username = getString(R.string.username);
        String password = getString(R.string.password);
        speechToTextService.setUsernameAndPassword(username, password);
        speechToTextService.setEndPoint("https://stream.watsonplatform.net/speech-to-text/api");
        return speechToTextService;
    }

    private RecognizeOptions getRecognizeOptions() {
        return new RecognizeOptions.Builder()
                .continuous(true)
                .contentType(ContentType.OPUS.toString())
                .model("en-US_BroadbandModel")
                .interimResults(true)
                .inactivityTimeout(2000).build();
    }

    private void startRecord() {
        buttonRecord.setText("Stop Record");
        inputStream = new MicrophoneInputStream(true);
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    speechToTextService.recognizeUsingWebSocket(inputStream, getRecognizeOptions(),
                            new BaseRecognizeCallback() {
                                @Override
                                public void onTranscription(SpeechResults speechResults) {
                                    try {
                                        String text = speechResults.getResults().get(0).getAlternatives().get(0).getTranscript();
                                        showResult(text);
                                    } catch (IndexOutOfBoundsException e) {
                                        showError(e);
                                    }
                                }

                                @Override
                                public void onError(Exception e) {
                                    showError(e);
                                }

                                @Override
                                public void onDisconnected() {
                                }
                            });
                } catch (Exception e) {
                    showError(e);
                }
            }
        }).start();
        listening = true;
    }

    private void stopRecord() {
        buttonRecord.setText("Start Record");
        try {
            inputStream.close();
            listening = false;
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void showError(final Exception e) {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(SpeechToTextActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
                e.printStackTrace();
            }
        });
    }

    private void showResult(final String result) {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                textView.setText(result);
            }
        });
    }

}