Ứng dụng Android dùng Cloud Speech Api để trích xuất phụ đề

compile 'com.google.api-client:google-api-client-android:1.22.0'
compile 'com.google.apis:google-api-services-speech:v1beta1-rev336-1.22.0'
compile 'com.google.apis:google-api-services-language:v1beta2-rev6-1.22.0'
compile 'com.google.code.findbugs:jsr305:2.0.1'

compile 'commons-io:commons-io:2.5'

<uses-permission android:name="android.permission.INTERNET"/>

<TextView
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:text=""
 android:id="@+id/speech_to_text_result"
 android:textSize="18sp"
 android:layout_alignParentTop="true"
/>

<Button
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_alignParentBottom="true"
 android:id="@+id/browse_button"
 android:text="Browse"
/>

Button browseButton = (Button)findViewById(R.id.browse_button);

browseButton.setOnClickListener(new View.OnClickListener() {
 @Override public void onClick(View view) {
  // More code here
  Intent filePicker = new Intent(Intent.ACTION_GET_CONTENT);
filePicker.setType("audio/flac");
startActivityForResult(filePicker, 1);
 }
});

Sau khi chọn được file âm thanh, dùng hàm ActivityForResult để nhận file
@Override
protected void onActivityResult(int requestCode,
 int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  if(resultCode == RESULT_OK) {
   final Uri soundUri = data.getData();
/ More code here
 }
}

AsyncTask.execute(new Runnable() {
 @Override
 public void run() {
   InputStream stream = getContentResolver()
    .openInputStream(soundUri);
   byte[] audioData = IOUtils.toByteArray(stream);
   stream.close();

   String base64EncodedData =
    Base64.encodeBase64String(audioData);

   // More code here
 }
}

MediaPlayer player = new MediaPlayer();
 player.setDataSource(MainActivity.this, soundUri);
 player.prepare(); player.start();

// Release the player
 player.setOnCompletionListener(
  new MediaPlayer.OnCompletionListener() {
    @Override
    public void onCompletion(MediaPlayer mediaPlayer) {
     mediaPlayer.release();
 }
});

private final String CLOUD_API_KEY = "Your_api_key";

Tiếp theo tạo ra 1 đối tượng Speech với Key Api
 Speech speechService = new Speech.Builder(
 AndroidHttp.newCompatibleTransport(),
 new AndroidJsonFactory(),
 null
 ).setSpeechRequestInitializer(
 new SpeechRequestInitializer(CLOUD_API_KEY)) .
build();

RecognitionConfig recognitionConfig = new RecognitionConfig();
recognitionConfig.setLanguageCode("en-US");

RecognitionAudio recognitionAudio = new RecognitionAudio();
recognitionAudio.setContent(base64EncodedData);

// Create request
SyncRecognizeRequest request = new SyncRecognizeRequest();
request.setConfig(recognitionConfig);
request.setAudio(recognitionAudio);

// Generate response
SyncRecognizeResponse response = speechService.speech()
 .syncrecognize(request)
 .execute();

// Extract transcript
SpeechRecognitionResult result = response.getResults().get(0);
final String transcript = result.getAlternatives().get(0)
 .getTranscript();

<Button
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_above="@+id/browse_button"
 android:id="@+id/analyze_button"
 android:text="Analyze"
/>

Button analyzeButton = (Button)findViewById(R.id.analyze_button);
analyzeButton.setOnClickListener(new View.OnClickListener() {
 @Override public void onClick(View view) {
  // More code here
 }
});

final CloudNaturalLanguage naturalLanguageService =
 new CloudNaturalLanguage.Builder(
  AndroidHttp.newCompatibleTransport(),
  new AndroidJsonFactory(),
  null
).setCloudNaturalLanguageRequestInitializer(
 new CloudNaturalLanguageRequestInitializer(CLOUD_API_KEY)
).build();

String transcript =
 ((TextView)findViewById(R.id.speech_to_text_result))
  .getText().toString();

Document document = new Document();
document.setType("PLAIN_TEXT");
document.setLanguage("en-US");
document.setContent(transcript);

Features features = new Features();
features.setExtractEntities(true);
features.setExtractDocumentSentiment(true);

final AnnotateTextRequest request = new AnnotateTextRequest();
request.setDocument(document);
request.setFeatures(features);

AsyncTask.execute(new Runnable() {
 @Override
 public void run() {
   AnnotateTextResponse response =
    naturalLanguageService.documents()
    .annotateText(request).execute();

  // More code here
 }
}