android 语音识别接口

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Android中主要通过RecognizerIntent来实现语音识别，其实代码比较简单，但是如果找不到设置，就会抛出异常ActivityNotFoundException，所以我们需要捕捉这个异常。而且语音识别在模拟器上是无法测试的，因为语音识别是访问google云端数据，所以如果手机的网络没有开启，就无法实现识别声音的！一定要开启手机的网络，如果手机不存在语音识别功能的话，也是无法启用识别！

主要代码：

[java] view plaincopy

package com.VoiceRecognition;
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.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;
public class VoiceRecognition extends Activity implements OnClickListener {
private static final int VOICE_RECOGNITION_REQUEST_CODE = 1234;
private ListView mList;
/**
* Called with the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button speakButton = (Button) findViewById(R.id.btn_speak);
mList = (ListView) findViewById(R.id.list);
// Check to see if a recognition activity is present
PackageManager pm = getPackageManager();
List<ResolveInfo> activities = pm.queryIntentActivities(new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);
if (activities.size() != 0)
{
speakButton.setOnClickListener(this);
}
else
{
speakButton.setEnabled(false);
speakButton.setText("Recognizer not present");
}
}
public void onClick(View v)
{
if (v.getId() == R.id.btn_speak)
{
startVoiceRecognitionActivity();
}
}
private void startVoiceRecognitionActivity()
{
//通过Intent传递语音识别的模式
Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
//语言模式和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 recognition demo");
//开始执行我们的Intent、语音识别
startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);
}
//当语音结束时的回调函数onActivityResult
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
if (requestCode == VOICE_RECOGNITION_REQUEST_CODE && resultCode == RESULT_OK)
{
// 取得语音的字符
ArrayList<String> matches = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
mList.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, matches));
}
super.onActivityResult(requestCode, resultCode, data);
}
}

布局xml文件如下：

[html] view plaincopy

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Button
android:id="@+id/btn_speak"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>

最后要注意的是，因为其主要原理就是将语音发送到google云端，然后云端处理，匹配相应的数据，发送到客户端。所以不要忘记，在manifest中加入网络访问权限：

[html] view plaincopy

<uses-permission android:name="android.permission.INTERNET" />