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。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。