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。
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* 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
*
* <a href="http://www.apache.org/licenses/license-2.0" rel="nofollow" target="_blank">http://www.apache.org/licenses/license-2.0</a>
*
* 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.
*/
@override
public 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 interaction
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 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.
*/
@override
protected 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 heard
arraylist 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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