300行代码让外婆实现语音搜索购物功能

buildscript {
 repositories {
 Google()
 jcenter()
 maven { url 'https://developer.huawei.com/repo/' }
 }
 dependencies {
 classpath 'com.android.tools.build:gradle:3.5.4'
 classpath 'com.huawei.agconnect:agcp:1.4.1.300'
 // NOTE: Do not place your application dependencies here; they belong
 // in the individual module build.gradle files
 }
}
 
allprojects {
 repositories {
 google()
 jcenter()
 maven { url 'Https://developer.huawei.com/repo/' }
 }
}

dependencies {
 //音频文件转写能力 SDK
 implementation 'com.huawei.hms:ml-computer-voice-aft:2.2.0.300'
 // 实时语音转写 SDK.
 implementation 'com.huawei.hms:ml-computer-voice-asr:2.2.0.300'
 // 实时语音转写 plugin.
 implementation 'com.huawei.hms:ml-computer-voice-asr-plugin:2.2.0.300'
 ...
}
apply plugin: 'com.huawei.agconnect' // HUAWEI agconnect Gradle plugin

signingConfigs {
 release {
 storeFile file("xxx.jks")
 keyAlias xxx
 keyPassWord xxxxxx
 storePassword xxxxxx
 v1SigningEnabled true
 v2SigningEnabled true
 }
 
}
 
buildTypes {
 release {
 minifyEnabled false
 proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
 }
 
 debug {
 signingConfig signingConfigs.release
 debuggable true
 }
}

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
 
<application
 android:requestLegacyExternalStorage="true"
 ...
</application>

if (ActivityCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
 requestCameraPermission();
}
 
private void requestCameraPermission() {
 final String[] permissions = new String[]{Manifest.permission.RECORD_AUDIO};
 if (!ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.RECORD_AUDIO)) {
 ActivityCompat.requestPermissions(this, permissions, Constants.AUDIO_PERMISSION_CODE);
 return;
 }
}

//设置您应用的鉴权信息
MLApplication.getInstance().setapiKey(AGConnectServicesConfig.fromContext(this).getString("client/api_key"));
 通过intent进行识别设置。
Intent intentPlugin = new Intent(this, MLAsrCaptuReactivity.class)
 // 设置识别语言为英语，若不设置，则默认识别英语。支持设置："zh-CN":中文；"en-US":英语等。
 .putExtra(MLAsrCaptureConstants.LANGUAGE, MLAsrConstants.LAN_ZH_CN)
 // 设置拾音界面是否显示识别结果
 .putExtra(MLAsrCaptureConstants.FEATURE, MLAsrCaptureConstants.FEATURE_WORDFLUX);
startActivityForResult(intentPlugin, "1");

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
 super.onActivityResult(requestCode, resultCode, data);
 String text = "";
 if (null == data) {
 addTagitem("Intent data is null.", true);
 }
 if (requestCode == "1") {
 if (data == null) {
  return;
 }
 Bundle bundle = data.getExtras();
 if (bundle == null) {
  return;
 }
 switch (resultCode) {
  case MLAsrCaptureConstants.ASR_SUCCESS:
  // 获取语音识别得到的文本信息。
  if (bundle.containsKey(MLAsrCaptureConstants.ASR_RESULT)) {
   text = bundle.getString(MLAsrCaptureConstants.ASR_RESULT);
  }
  if (text == null || "".equals(text)) {
   text = "Result is null.";
   Log.e(TAG, text);
  } else {
   //将语音识别结果设置在搜索框上
   searchEdit.setText(text);
   goSearch(text, true);
  }
  break;
  // 返回值为MLAsrCaptureConstants.ASR_FAILURE表示识别失败。
  case MLAsrCaptureConstants.ASR_FAILURE:
  // 判断是否包含错误码。
  if (bundle.containsKey(MLAsrCaptureConstants.ASR_ERROR_CODE)) {
   text = text + bundle.getInt(MLAsrCaptureConstants.ASR_ERROR_CODE);
   // 对错误码进行处理。
  }
  // 判断是否包含错误信息。
  if (bundle.containsKey(MLAsrCaptureConstants.ASR_ERROR_MESSAGE)) {
   String errORMsg = bundle.getString(MLAsrCaptureConstants.ASR_ERROR_MESSAGE);
   // 对错误信息进行处理。
   if (errorMsg != null && !"".equals(errorMsg)) {
   text = "[" + text + "]" + errorMsg;
   }
  }
  //判断是否包含子错误码。
  if (bundle.containsKey(MLAsrCaptureConstants.ASR_SUB_ERROR_CODE)) {
   int subErrorCode = bundle.getInt(MLAsrCaptureConstants.ASR_SUB_ERROR_CODE);
   // 对子错误码进行处理。
   text = "[" + text + "]" + subErrorCode;
  }
  Log.e(TAG, text);
  break;
  default:
  break;
 }
 }
}

private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static final String[] PERMISSIONS_STORAGE = {
 Manifest.permission.READ_EXTERNAL_STORAGE,
 Manifest.permission.WRITE_EXTERNAL_STORAGE };
public static void verifyStoragePermissions(Activity activity) {
 // Check if we have write permission
 int permission = ActivityCompat.checkSelfPermission(activity,
  Manifest.permission.WRITE_EXTERNAL_STORAGE);
 if (permission != PackageManager.PERMISSION_GRANTED) {
 // We don't have permission so prompt the user
 ActivityCompat.requestPermissions(activity, PERMISSIONS_STORAGE,
  REQUEST_EXTERNAL_STORAGE);
 }
}

// 设置 ApiKey.
MLApplication.getInstance().setApiKey(AGConnectServicesConfig.fromContext(getApplication()).getString("client/api_key"));
MLRemoteAftSetting setting = new MLRemoteAftSetting.Factory()
 // 设置转写语言编码，使用BCP-47规范，当前支持中文普通话、英文转写。
 .setLanguageCode("zh")
 // 设置是否在转写输出的文本中自动增加标点符号,默认为false。
 .enablePunctuation(true)
 // 设置是否连带输出每段音频的文字转写结果和对应的音频时移，默认为false（此参数仅小于1分钟的音频需要设置）。
 .enableWordTimeOffset(true)
 // 设置是否输出句子出现在音频文件中的时间偏移值,默认为false。
 .enableSentenceTimeOffset(true)
 .create();
 
// 新建音频文件转写引擎。
MLRemoteAftEngine engine = MLRemoteAftEngine.getInstance();
engine.init(this);
// 将侦听器回调传给第一步中定义的音频文件转写引擎中
engine.setAftListener(aftListener);

private MLRemoteAftListener aftListener = new MLRemoteAftListener() {
 public void onResult(String taskId, MLRemoteAftResult result, Object ext) {
 // 获取转写结果通知。
 if (result.isComplete()) {
  // 转写结果处理。
 }
 }
 @Override
 public void onError(String taskId, int errorCode, String message) {
 // 转写错误回调函数。
 }
 @Override
 public void onInitComplete(String taskId, Object ext) {
 // 预留接口。
 }
 @Override
 public void onUploadProgress(String taskId, double progress, Object ext) {
 // 预留接口。
 }
 @Override
 public void onEvent(String taskId, int eventId, Object ext) {
 // 预留接口。
 }
};

private MLRemoteAftListener asrListener = new MLRemoteAftListener() {
 @Override
 public void onInitComplete(String taskId, Object ext) {
 Log.e(TAG, "MLAsrCallBack onInitComplete");
 // 长语音初始化完成，开始转写
 start(taskId);
 }
 @Override
 public void onUploadProgress(String taskId, double progress, Object ext) {
 Log.e(TAG, " MLAsrCallBack onUploadProgress");
 }
 @Override
 public void onEvent(String taskId, int eventId, Object ext) {
 // 用于长语音
 Log.e(TAG, "MLAsrCallBack onEvent" + eventId);
 if (MLAftEvents.UPLOADED_EVENT == eventId) { // 文件上传成功
  // 获取转写结果
  startQueryResult(taskId);
 }
 }
 @Override
 public void onResult(String taskId, MLRemoteAftResult result, Object ext) {
 Log.e(TAG, "MLAsrCallBack onResult taskId is :" + taskId + " ");
 if (result != null) {
  Log.e(TAG, "MLAsrCallBack onResult isComplete: " + result.isComplete());
  if (result.isComplete()) {
  TimerTask timerTask = timerTaskMap.get(taskId);
  if (null != timerTask) {
   timerTask.cancel();
   timerTaskMap.remove(taskId);
  }
  if (result.getText() != null) {
   Log.e(TAG, taskId + " MLAsrCallBack onResult result is : " + result.getText());
   tvText.setText(result.getText());
  }
  List<MLRemoteAftResult.Segment> words = result.getWords();
  if (words != null && words.size() != 0) {
   for (MLRemoteAftResult.Segment word : words) {
   Log.e(TAG, "MLAsrCallBack word text is : " + word.getText() + ", startTime is : " + word.getStartTime() + ". endTime is : " + word.getEndTime());
   }
  }
  List<MLRemoteAftResult.Segment> sentences = result.getSentences();
  if (sentences != null && sentences.size() != 0) {
   for (MLRemoteAftResult.Segment sentence : sentences) {
   Log.e(TAG, "MLAsrCallBack sentence text is : " + sentence.getText() + ", startTime is : " + sentence.getStartTime() + ". endTime is : " + sentence.getEndTime());
   }
  }
  }
 }
 }
 @Override
 public void onError(String taskId, int errorCode, String message) {
 Log.i(TAG, "MLAsrCallBack onError : " + message + "errorCode, " + errorCode);
 switch (errorCode) {
  case MLAftErrors.ERR_AUDIO_FILE_NOTSUPPORTED:
  break;
 }
 }
};
// 上传转写任务
private void start(String taskId) {
 Log.e(TAG, "start");
 engine.setAftListener(asrListener);
 engine.startTask(taskId);
}
// 获取转写结果
private Map<String, TimerTask> timerTaskMap = new HashMap<>();
private void startQueryResult(final String taskId) {
 Timer mTimer = new Timer();
 TimerTask mTimerTask = new TimerTask() {
 @Override
 public void run() {
  getResult(taskId);
 }
 };
 // 10s轮训获取长语音转写结果
 mTimer.schedule(mTimerTask, 5000, 10000);
 // 界面销毁前要清除 timerTaskMap
 timerTaskMap.put(taskId, mTimerTask);
}

//获取音频文件的uri
Uri uri = getFileUri();
//获取音频时间
Long audioTime = getAudioFileTimeFromUri(uri);
//判断音频时间是否超过60秒
if (audioTime < 60000) {
 // uri为从本地存储或者录音机读取到的语音资源，仅支持时长在1分钟之内的本地音频
 this.taskId = this.engine.shortRecognize(uri, this.setting);
 Log.i(TAG, "Short audio transcription.");
} else {
 // longRecognize为长语音转写接口，用于转写时长大于1分钟，小于5小时的语音。
 this.taskId = this.engine.longRecognize(uri, this.setting);
 Log.i(TAG, "Long audio transcription.");
}
 
private Long getAudioFileTimeFromUri(Uri uri) {
 Long time = null;
 Cursor cursor = this.getContentResolver()
  .query(uri, null, null, null, null);
 if (cursor != null) {
 
 cursor.moveToFirst();
 time = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DURATION));
 } else {
 MediaPlayer mediaPlayer = new MediaPlayer();
 try {
  mediaPlayer.setDataSource(String.valueOf(uri));
  mediaPlayer.prepare();
 } catch (IOException e) {
  Log.e(TAG, "Failed to read the file time.");
 }
 time = Long.valueOf(mediaPlayer.getDuration());
 }
 return time;
}