Android 轻松实现语音识别

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* Copyright (C) 

2008

The Android Open Source Project

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*

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* Licensed under the Apache License, Version 

2.0

(the 

"License"

);

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* you may not use 

this

file except in compliance with the License.

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* You may obtain a copy of the License at

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*

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* http:

//www.apache.org/licenses/LICENSE-2.0

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*

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* Unless required by applicable law or agreed to in writing, software

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* distributed under the License is distributed on an 

"AS IS"

BASIS,

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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

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* See the License 

for

the specific language governing permissions and

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* limitations under the License.

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*/

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package

com.example.android.apis.app;

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import

com.example.android.apis.R;

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import

android.app.Activity;

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import

android.content.Intent;

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import

android.content.pm.PackageManager;

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import

android.content.pm.ResolveInfo;

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import

android.os.Bundle;

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import

android.speech.RecognizerIntent;

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import

android.view.View;

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import

android.view.View.OnClickListener;

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import

android.widget.ArrayAdapter;

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import

android.widget.Button;

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import

android.widget.ListView;

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import

java.util.ArrayList;

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import

java.util.List;

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/**

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* Sample code that invokes the speech recognition intent API.

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*/

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public

class

VoiceRecognition 

extends

Activity 

implements

OnClickListener
{

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private

static

final

int

VOICE_RECOGNITION_REQUEST_CODE = 

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;

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private

ListView mList;

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/**

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* Called with the activity is first created.

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*/

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@Override

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public

void

onCreate(Bundle savedInstanceState) {

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super

.onCreate(savedInstanceState);

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// Inflate our UI from its XML layout description.

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setContentView(R.layout.voice_recognition);

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// Get display items for later interaction

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Button speakButton = (Button) findViewById(R.id.btn_speak);

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mList = (ListView) findViewById(R.id.list);

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// Check to see if a recognition activity is present

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PackageManager pm = getPackageManager();

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List activities = pm.queryIntentActivities(

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new

Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 

0

);

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if

(activities.size() != 

0

) {

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speakButton.setOnClickListener(

this

);

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} 

else

{

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speakButton.setEnabled(

false

);

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speakButton.setText(

"Recognizer not present"

);

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}

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}

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/**

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* Handle the click on the start recognition button.

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*/

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public

void

onClick(View v) {

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if

(v.getId() == R.id.btn_speak) {

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startVoiceRecognitionActivity();

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}

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}

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/**

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* Fire an intent to start the speech recognition activity.

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*/

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private

void

startVoiceRecognitionActivity() {

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Intent intent = 

new

Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);

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intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,

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RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);

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intent.putExtra(RecognizerIntent.EXTRA_PROMPT, 

"Speech recognition demo"

);

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startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);

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}

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/**

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* Handle the results from the recognition activity.

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*/

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@Override

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protected

void

onActivityResult(

int

requestCode, 

int

resultCode,
Intent data) {

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if

(requestCode == VOICE_RECOGNITION_REQUEST_CODE && resultCode == RESULT_OK) {

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// Fill the list view with the strings the recognizer thought it could have heard

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ArrayList matches = data.getStringArrayListExtra(

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RecognizerIntent.EXTRA_RESULTS);

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mList.setAdapter(

new

ArrayAdapter(

this

, android.R.layout.simple_list_item_1,

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matches));

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}

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super

.onActivityResult(requestCode, resultCode, data);

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}

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}