Android 轻松实现语音识别的完整代码

苹果的iphone 有语音识别用的是Google 的技术，做为Google 力推的Android 自然会将其核心技术往Android 系统里面植入，并结合google 的云端技术将其发扬光大。 

所以Google Voice Recognition在Android 的实现就变得极其轻松。 
 
语音识别，借助于云端技术可以识别用户的语音输入，包括语音控制等技术，下面我们将利用Google 提供的Api 实现这一功能。 

功能点为：通过用户语音将用户输入的语音识别出来，并打印在列表上。 

功能界面如下： 
 
用户通过点击speak按钮显示界面： 
 
用户说完话后，将提交到云端搜索： 
 
在云端搜索完成后，返回打印数据： 

001 * Copyright (C) 2008 The Android Open Source Project
002 *
003 * Licensed under the Apache License, Version 2.0 (the "License");
004 * you may not use this file except in compliance with the License.
005 * You may obtain a copy of the License at
006 *
007 * http://www.apache.org/licenses/LICENSE-2.0
008 *
009 * Unless required by applicable law or agreed to in writing, software
010 * distributed under the License is distributed on an "AS IS" BASIS,
011 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012 * See the License for the specific language governing permissions and
013 * limitations under the License.
014 */
015
016 package com.example.android.apis.app;
017
018 import com.example.android.apis.R;
019
020 import android.app.Activity;
021 import android.content.Intent;
022 import android.content.pm.PackageManager;
023 import android.content.pm.ResolveInfo;
024 import android.os.Bundle;
025 import android.speech.RecognizerIntent;
026 import android.view.View;
027 import android.view.View.OnClickListener;
028 import android.widget.ArrayAdapter;
029 import android.widget.Button;
030 import android.widget.ListView;
031
032 import java.util.ArrayList;
033 import java.util.List;
034
035 /**
036 * Sample code that invokes the speech recognition intent API.
037 */
038 public class VoiceRecognition extends Activity implements OnClickListener {
039
040 private static final int VOICE_RECOGNITION_REQUEST_CODE = 1234;
041
042 private ListView mList;
043
044 /**
045 * Called with the activity is first created.
046 */
047 @Override
048 public void onCreate(Bundle savedInstanceState) {
049 super.onCreate(savedInstanceState);
050
051 // Inflate our UI from its XML layout description.
052 setContentView(R.layout.voice_recognition);
053
054 // Get display items for later interaction
055 Button speakButton = (Button) findViewById(R.id.btn_speak);
056
057 mList = (ListView) findViewById(R.id.list);
058
059 // Check to see if a recognition activity is present
060 PackageManager pm = getPackageManager();
061 List activities = pm.queryIntentActivities(
062 new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);
063 if (activities.size() != 0) {
064 speakButton.setOnClickListener(this);
065 } else {
066 speakButton.setEnabled(false);
067 speakButton.setText("Recognizer not present");
068 }
069 }
070
071 /**
072 * Handle the click on the start recognition button.
073 */
074 public void onClick(View v) {
075 if (v.getId() == R.id.btn_speak) {
076 startVoiceRecognitionActivity();
077 }
078 }
079
080 /**
081 * Fire an intent to start the speech recognition activity.
082 */
083 private void startVoiceRecognitionActivity() {
084 Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
085 intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
086 RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
087 intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Speech recognition demo");
088 startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);
089 }
090
091 /**
092 * Handle the results from the recognition activity.
093 */
094 @Override
095 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
096 if (requestCode == VOICE_RECOGNITION_REQUEST_CODE && resultCode == RESULT_OK) {
097 // Fill the list view with the strings the recognizer thought it could have heard
098 ArrayList matches = data.getStringArrayListExtra(
099 RecognizerIntent.EXTRA_RESULTS);
100 mList.setAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1,
101 matches));
102 }
103
104 super.onActivityResult(requestCode, resultCode, data);
105 }
106 }