Android 语音识别示例

本文介绍使用android.speech包下的api实现一个简单的语音识别例子。

speech api参考：http://developer.android.com/intl/zh-CN/reference/android/speech/package-summary.html

android开发入门参考：http://maimode.iteye.com/blog/1634268

下文给出核心的代码部分：

EgSpeechActivity（启动的activity）

package com.example.androideg.speech;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.speech.RecognizerIntent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class EgSpeechActivity extends Activity implements OnClickListener {
	 public final static String EXTRA_MESSAGE = "com.example.androideg.speech.MESSAGE";
	 
	 private static final int VOICE_RECOGNITION_REQUEST_CODE = 1001;  
	 private static final String SPEECH_PROMPT = "请讲话";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
		// 检查是否存在recognition activity
		PackageManager pm = getPackageManager();
		List<ResolveInfo> activities = pm.queryIntentActivities(new Intent(
				RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);
		Button btn = (Button) findViewById(R.id.btn_speek);
		if (activities.size() != 0) {
			//如果存在recognition activity则为按钮绑定点击事件
			btn.setOnClickListener(this);
		} else {
			// 如果不存在则禁用按钮
			btn.setEnabled(false);
			btn.setText("语音识别不可用");
		}

    }

	@Override
	public void onClick(View v) {
		if (v.getId() == R.id.btn_speek){
			startVoiceRecognitionActivity();
		}
	}
	
	/**
	 * 启动语音识别activity，接收用户语音输入
	 */
	private void startVoiceRecognitionActivity(){
		//通过Intent传递语音识别的模式  
        Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);  
        //语言模式：自由形式的语音识别  
        intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
        //提示语音开始  
        intent.putExtra(RecognizerIntent.EXTRA_PROMPT, SPEECH_PROMPT);  
        //开始执行我们的Intent、语音识别  并等待返回结果
        startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);
	}
	
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		// 确定是语音识别activity返回的结果
		if (requestCode == VOICE_RECOGNITION_REQUEST_CODE){
			// 确定返回结果的状态是成功
			if (resultCode == RESULT_OK){
				// 获取语音识别结果  
	            ArrayList<String> matches = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);  
	            startDisplayMessageActivity(matches);
			}
		}
		
		super.onActivityResult(requestCode, resultCode, data);
	}
	
	/**
	 * 启动展示activity，显示识别结果
	 * @param message
	 */
	private void startDisplayMessageActivity(ArrayList<String> strList){
		Intent intent = new Intent(this, DisplayMessageActivity.class);
    	intent.putExtra(EXTRA_MESSAGE, strList);
    	startActivity(intent);
	}
}

相应的layout文件activity_main.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    tools:context=".EgSpeechActivity" >


    <Button
        android:id="@+id/btn_speek"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/button_speak" />

</LinearLayout>

DisplayMessageActivity（用于展示识别结果）：

package com.example.androideg.speech;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class DisplayMessageActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
		// 设置布局
		setContentView(R.layout.activity_display_message);
		
		// 从intent中获取数据
		Intent intent = getIntent();
		ArrayList<String> strList = intent.getStringArrayListExtra(EgSpeechActivity.EXTRA_MESSAGE);

		//找到list，然后赋值
		ListView list = (ListView) findViewById(R.id.list);
		list.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, strList));
    }

}

 

 相应的layout文件activity_display_message.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="0dip"
        android:layout_weight="1" >
    </ListView>

 </LinearLayout>

经过测试，需要在网络支持的环境下才能识别，支持中文识别。 

附件有本示例的eclipse项目文件。

运行界面：