Android 轻松实现语音识别详解及实例代码

package com.example.test;

import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.speech.RecognizerIntent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends Activity implements OnClickListener {
 private static final int VOICE_RECOGNITION_REQUEST_CODE = 1234;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  Button btn = (Button) findViewById(R.id.btn); // 识别按钮
  PackageManager pm = getPackageManager();
  List activities = pm.queryIntentActivities(new Intent(
    RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0); // 本地识别程序
  // new Intent(RecognizerIntent.ACTION_WEB_SEARCH), 0); // 网络识别程序
  
  /*
   * 此处没有使用捕捉异常，而是检测是否有语音识别程序。
   * 也可以在startRecognizerActivity()方法中捕捉ActivityNotFoundException异常
   */
  if (activities.size() != 0) {
   btn.setOnClickListener(this);
  } else {
   // 若检测不到语音识别程序在本机安装，测将扭铵置灰
   btn.setEnabled(false);
   btn.setText("未检测到语音识别设备");
  }
 }

 public void onClick(View v) {
  if (v.getId() == R.id.btn) {
   startRecognizerActivity();
  }
 }
 // 开始识别
 private void startRecognizerActivity() { 
  // 通过Intent传递语音识别的模式，开启语音
  Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
  // 语言模式和自由模式的语音识别
  intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
    RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
  // 提示语音开始
  intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "开始语音");
  // 开始语音识别
  startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);
  // 调出识别界面
 }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  // 回调获取从谷歌得到的数据
  if (requestCode == VOICE_RECOGNITION_REQUEST_CODE
    && resultCode == RESULT_OK) {
   // 取得语音的字符
   ArrayList<String> results = data
     .getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
   String resultString = "";
   for (int i = 0; i < results.size(); i++) {
    resultString += results.get(i);
   }
   Toast.makeText(this, resultString, Toast.LENGTH_SHORT).show();
  }
  // 语音识别后的回调，将识别的字串以Toast显示
  super.onActivityResult(requestCode, resultCode, data);
 }
}