public InteractionClient(
Context context,
AWSCredentialsProvider credentialsProvider,
Regions region,
InteractionConfig interactionConfig,
ClientConfiguration clientConfiguration) {
if (context == null) {
throw new InvalidParameterException("Context cannot be null.");
} else {
this.context = context;
}
// Check if all necessary credentials are available.
if (credentialsProvider == null) {
throw new InvalidParameterException("Credentials are not set.");
}
if (interactionConfig == null) {
throw new InvalidParameterException("Interaction config is not set.");
}
if ((interactionConfig.getUserId() == null || interactionConfig.getUserId().isEmpty())
&& !(credentialsProvider instanceof CognitoCredentialsProvider)) {
throw new InvalidParameterException(
"User id must be set in the config or Amazon Cognito Identity must used as the credentials provider");
}
this.interactionConfig = interactionConfig;
this.credentialsProvider = credentialsProvider;
this.interactionListener = new DefaultInteractionListener();
// Create service low-level client.
if (null == clientConfiguration) {
clientConfiguration = new ClientConfiguration();
}
String userAgent = INTERACTION_CLIENT_USER_AGENT;
if (!StringUtils.isBlank(clientConfiguration.getUserAgent())) {
userAgent += clientConfiguration.getUserAgent();
}
clientConfiguration.setUserAgent(userAgent);
amazonlex = new AmazonLexRuntimeClient(credentialsProvider, clientConfiguration);
amazonlex.setRegion(Region.getRegion(region));
}
/**
* Invokes the Android {@link MediaPlayer} to playback audio if audio playback was requested, and
* continues to analyze the response. If the response does not contain audio stream or if audio
* playback was not requested, continues to analyze the response.
*
* @param handler {@link Handler}, to interact with app components in the main thread.
* @param result {@link PostContentResult}, response from the Amazon Lex service.
* @param client {@link InteractionClient}, reference to this object.
* @param responseMode {@link ResponseType}, current response type.
*/
private void processResponseAudioPlayback(
final Handler handler,
final PostContentResult result,
final InteractionClient client,
final ResponseType responseMode,
final ResponseType requestType) {
// Check if response is audio and audio playback is requested.
if (ResponseType.AUDIO_MPEG.equals(responseMode) && interactionConfig.isEnableAudioPlayback()) {
this.lMediaPlayer = new MediaPlayer();
this.lMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
setAudioPlaybackState(BUSY);
File tempAudioFile = File.createTempFile("lex_temp_response", "mp3", context.getFilesDir());
tempAudioFile.deleteOnExit();
// Media player listeners.
lMediaPlayer.setOnErrorListener(
new MediaPlayer.OnErrorListener() {
@Override
public boolean onError(final MediaPlayer mp, final int what, final int extra) {
if (interactionListener != null) {
final Runnable appCallback =
new Runnable() {
@Override
public void run() {
audioPlaybackListener.onAudioPlaybackError(
new AudioPlaybackException(
String.format(
Locale.US,
"MediaPlayer error: \"what\": %d, \"extra\":%d",
what,
extra)));
}
};
handler.post(appCallback);
}
return false;
}
});
lMediaPlayer.setOnPreparedListener(
new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
if (audioPlaybackListener != null) {
final Runnable appCallback =
new Runnable() {
@Override
public void run() {
audioPlaybackListener.onAudioPlaybackStarted();
}
};
handler.post(appCallback);
}
mp.start();
}
});
lMediaPlayer.setOnCompletionListener(
new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
setAudioPlaybackState(NOT_BUSY);
if (audioPlaybackListener != null) {
final Runnable appCallback =
new Runnable() {
@Override
public void run() {
audioPlaybackListener.onAudioPlayBackCompleted();
}
};
handler.post(appCallback);
}
try {
if (lMediaPlayer.isPlaying() || lMediaPlayer.isLooping()) {
lMediaPlayer.stop();
}
lMediaPlayer.release();
} catch (final Exception e) {
Log.e(TAG, "InteractionClient: Error while releasing MediaPlayer", e);
} finally {
lMediaPlayer = null;
}
}
});
final InputStream audioStream = result.getAudioStream();
tempAudioFile = File.createTempFile("lex_temp_response", "dat", context.getFilesDir());
tempAudioFile.deleteOnExit();
final FileOutputStream audioOut = new FileOutputStream(tempAudioFile);
final byte buffer[] = new byte[16384];
int length;
while ((length = audioStream.read(buffer)) != -1) {
audioOut.write(buffer, 0, length);
}
audioOut.close();
final FileInputStream audioIn = new FileInputStream(tempAudioFile);
lMediaPlayer.setDataSource(audioIn.getFD());
lMediaPlayer.prepare();
processResponse(handler, result, client, responseMode, requestType);
} catch (final Exception e) {
// Playback failed.
if (audioPlaybackListener != null) {
final Runnable appCallback =
new Runnable() {
@Override
public void run() {
audioPlaybackListener.onAudioPlaybackError(
new LexClientException("Audio playback failed", e));
}
};
handler.post(appCallback);
}
try {
if (lMediaPlayer.isPlaying() || lMediaPlayer.isLooping()) {
lMediaPlayer.stop();
}
lMediaPlayer.release();
lMediaPlayer = null;
} catch (final Exception exp) {
Log.e(TAG, "InteractionClient: Error while releasing MediaPlayer", exp);
}
processResponse(handler, result, client, responseMode, requestType);
} finally {
setAudioPlaybackState(NOT_BUSY);
}
} else {
processResponse(handler, result, client, responseMode, requestType);
}
}