[转]Android项目开发代码轻松实现语音识别

addison_lin

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.

*/

@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);

}

}