android 语音识别 开源代码,Android 轻松实现语音识别

/*

* 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

<

ResolveInfo

>

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

<

String

>

matches

=

data.getStringArrayListExtra(

RecognizerIntent.EXTRA_RESULTS);

mList.setAdapter(

new

ArrayAdapter

<

String

>

(

this

, android.R.layout.simple_list_item_1,

matches));

}

super

.onActivityResult(requestCode, resultCode, data);

}

}