Android使用百度语音识别的示例代码

本文使用百度语音识别，完成语音识别的功能，使用百度语音识别，先要申请APP ID，这个直接到百度网站上有说明文档，本文不再赘述。申请之后，下载SDK包，按照百度官网要求，合并libs和res两个目录到项目中，然后在build.gradle(module:app)中的Android{...}下添加

sourceSets{ 
  main{ 
    jniLibs.srcDirs=['libs'] 
  } 
} 

这样， 百度语音识别的so文件才能正常使用。

Manifest文件中添加权限

<uses-permission android:name="android.permission.RECORD_AUDIO" /> 
<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> 
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /> 
<uses-permission android:name="android.permission.READ_PHONE_STATE" /> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 

然后还要在Manifest中添加

<!-- 请填写应用实际的APP_ID --> 
<meta-data android:name="com.baidu.speech.APP_ID" android:value="APP ID"/> 
<!-- 请填写应用实际的api_KEY --> 
<meta-data android:name="com.baidu.speech.API_KEY" android:value="API_KEY"/> 
<!-- 请填写应用实际的SECRET_KEY --> 
<meta-data android:name="com.baidu.speech.SECRET_KEY" android:value="SECRET_KEY"/> 
<service android:name="com.baidu.speech.VoiceRecognitionService" android:exported="false" /> 

其中的APP ID，API_KEY和SECRET_KEY替换为你申请的内容。

我们封装了一个工具类，用来使用语音识别

package com.yjp.speechrecognizer; 
import android.content.ComponentName; 
import android.content.Context; 
import android.content.Intent; 
import android.os.Bundle; 
import android.speech.RecognitionListener; 
import android.speech.SpeechRecognizer; 
import android.widget.Toast; 
import com.baidu.speech.VoiceRecognitionService; 
public class SpeechRecognizerTool implements RecognitionListener { 
  public interface ResultsCallback { 
    void onResults(String result); 
  } 
  private Context mContext; 
  private SpeechRecognizer mSpeechRecognizer; 
  private ResultsCallback mResultsCallback; 
  public SpeechRecognizerTool(Context context) { 
    mContext = context; 
  } 
  public synchronized void createTool() { 
    if (null == mSpeechRecognizer) { 
      // 创建识别器 
      mSpeechRecognizer = SpeechRecognizer.createSpeechRecognizer(mContext, 
          new ComponentName(mContext, VoiceRecognitionService.class)); 
      // 注册监听器 
      mSpeechRecognizer.setRecognitionListener(this); 
    } 
  } 
  public synchronized void destroyTool() { 
    mSpeechRecognizer.stopListening(); 
    mSpeechRecognizer.destroy(); 
    mSpeechRecognizer = null; 
  } 
  // 开始识别 
  public void startASR(ResultsCallback callback) { 
    mResultsCallback = callback; 
    Intent intent = new Intent(); 
    bindParams(intent); 
    mSpeechRecognizer.startListening(intent); 
  } 
  //停止识别 
  public void stopASR() { 
    mSpeechRecognizer.stopListening(); 
  } 
  private void bindParams(Intent intent) { 
    // 设置识别参数 
  } 
  @Override 
  public void onReadyForSpeech(Bundle params) { 
    // 准备就绪 
    Toast.makeText(mContext, "请开始说话", Toast.LENGTH_SHORT).show(); 
  } 
  @Override 
  public void onBeginninGofSpeech() { 
    // 开始说话处理 
  } 
  @Override 
  public void onRmsChanged(float rmsdB) { 
    // 音量变化处理 
  } 
  @Override 
  public void onBufferReceived(byte[] buffer) { 
    // 录音数据传出处理 
  } 
  @Override 
  public void onEndOfSpeech() { 
    // 说话结束处理 
  } 
  @Override 
  public void onError(int error) { 
  } 
  @Override 
  public void onResults(Bundle results) { 
    // 最终结果处理 
    if (mResultsCallback != null) { 
      String text = results.get(SpeechRecognizer.RESULTS_RECOGNITION) 
          .toString().replace("]", "").replace("[", ""); 
      mResultsCallback.onResults(text); 
    } 
  } 
  @Override 
  public void onPartialResults(Bundle partialResults) { 
    // 临时结果处理 
  } 
  @Override 
  public void onEvent(int eventType, Bundle params) { 
  } 
} 

MainActivity的界面如下

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="Http://schemas.android.com/apk/res/android" 
  xmlns:tools="http://schemas.android.com/tools" 
  android:id="@+id/activity_main" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:paddingBottom="@dimen/activity_vertical_margin" 
  android:paddingLeft="@dimen/activity_horizontal_margin" 
  android:paddingRight="@dimen/activity_horizontal_margin" 
  android:paddingTop="@dimen/activity_vertical_margin" 
  android:orientation="vertical" 
  android:gravity="center" 
  tools:context="com.yjp.speechrecognizer.MainActivity"> 
  <Button 
    android:id="@+id/startSpeechButton" 
    android:layout_width="60dp" 
    android:layout_height="40dp" 
    android:background="@drawable/bdspeech_btn_orangelight_nORMal" 
    android:text="按住说话"/> 
  <TextView 
    android:id="@+id/speechTextView" 
    android:layout_margin="10dp" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" /> 
</LinearLayout> 

MainActivity的类实现为：

package com.yjp.speechrecognizer; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.MotionEvent; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 
public class MainActivity extends AppCompatActivity implements SpeechRecognizerTool.ResultsCallback { 
  private Button mStartSpeechButton; 
  private TextView mTextView; 
  private SpeechRecognizerTool mSpeechRecognizerTool = new SpeechRecognizerTool(this); 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    mTextView = (TextView) findViewById(R.id.speechTextView); 
    mStartSpeechButton = (Button) findViewById(R.id.startSpeechButton); 
    mStartSpeechButton.setOnTouchListener(new View.OnTouchListener() { 
      @Override 
      public boolean onTouch(View v, MotionEvent event) { 
        int action = event.getAction(); 
        switch (action) { 
          case MotionEvent.ACTION_DOWN: 
            mSpeechRecognizerTool.startASR(MainActivity.this); 
            mStartSpeechButton.setBackgroundResource( 
                R.drawable.bdspeech_btn_orangelight_pressed); 
            break; 
          case MotionEvent.ACTION_UP: 
            mSpeechRecognizerTool.stopASR(); 
            mStartSpeechButton.setBackgroundResource( 
                R.drawable.bdspeech_btn_orangelight_normal); 
            break; 
          default: 
            return false; 
        } 
        return true; 
      } 
    }); 
  } 
  @Override 
  protected void onStart() { 
    super.onStart(); 
    mSpeechRecognizerTool.createTool(); 
  } 
  @Override 
  protected void onStop() { 
    super.onStop(); 
    mSpeechRecognizerTool.destroyTool(); 
  } 
  @Override 
  public void onResults(String result) { 
    final String finalResult = result; 
    MainActivity.this.runOnUiThread(new Runnable() { 
      @Override 
      public void run() { 
        mTextView.setText(finalResult); 
      } 
    }); 
  } 
} 

可以运行看一下效果，感觉识别率还是不错的。

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