[转]Android项目开发代码轻松实现语音识别
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：* Copyright (C) 2008 The Android Open Source Project** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at** http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/
package com.example.android.apis.app;
import com.example.android.apis.R;
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;
/*** Sample code that invokes the speech recognition intent API.*/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.*/@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
// Inflate our UI from its XML layout description.setContentView(R.layout.voice_recognition);
// Get display items for later interactionButton speakButton = (Button) findViewById(R.id.btn_speak);
mList = (ListView) findViewById(R.id.list);
// Check to see if a recognition activity is presentPackageManager pm = getPackageManager();List 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");}}
/*** Handle the click on the start recognition button.*/public void onClick(View v) {if (v.getId() == R.id.btn_speak) {startVoiceRecognitionActivity();}}
/*** Fire an intent to start the speech recognition activity.*/private void startVoiceRecognitionActivity() {Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Speech recognition demo");startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);}
/*** Handle the results from the recognition activity.*/@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {if (requestCode == VOICE_RECOGNITION_REQUEST_CODE && resultCode == RESULT_OK) {// Fill the list view with the strings the recognizer thought it could have heardArrayList matches = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);mList.setAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1,matches));}
super.onActivityResult(requestCode, resultCode, data);}}
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