Android 輕鬆實現語音識別的完整代碼

[代碼] Android 輕鬆實現語音識別的完整代碼

001	* Copyright (C) 2008 The Android Open Source Project
002	*

003	* Licensed under the Apache License, Version 2.0 (the "License");
004	* you may not use this file except in compliance with the License.

005	* You may obtain a copy of the License at
006	*

007	* http://www.apache.org/licenses/LICENSE-2.0
008	*

009	* Unless required by applicable law or agreed to in writing, software
010	* distributed under the License is distributed on an "AS IS" BASIS,

011	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012	* See the License for the specific language governing permissions and

013	* limitations under the License.
014	*/

015
016	package com.example.android.apis.app;

017
018	import com.example.android.apis.R;

019
020	import android.app.Activity;

021	import android.content.Intent;
022	import android.content.pm.PackageManager;

023	import android.content.pm.ResolveInfo;
024	import android.os.Bundle;

025	import android.speech.RecognizerIntent;
026	import android.view.View;

027	import android.view.View.OnClickListener;
028	import android.widget.ArrayAdapter;

029	import android.widget.Button;
030	import android.widget.ListView;

031
032	import java.util.ArrayList;

033	import java.util.List;
034

035	/**
036	* Sample code that invokes the speech recognition intent API.

037		*/
038	public class VoiceRecognition extends Activity implements OnClickListener {

039
040	private static final int VOICE_RECOGNITION_REQUEST_CODE = 1234;

041
042	private ListView mList;

043
044	/**

045	* Called with the activity is first created.
046	*/

047	@Override
048	public void onCreate(Bundle savedInstanceState) {

049	super.onCreate(savedInstanceState);
050

051	// Inflate our UI from its XML layout description.
052	setContentView(R.layout.voice_recognition);

053
054	// Get display items for later interaction

055	Button speakButton = (Button) findViewById(R.id.btn_speak);
056

057	mList = (ListView) findViewById(R.id.list);
058

059	// Check to see if a recognition activity is present
060	PackageManager pm = getPackageManager();

061	List activities = pm.queryIntentActivities(
062	new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);

063	if (activities.size() != 0) {
064	speakButton.setOnClickListener(this);

065	} else {
066	speakButton.setEnabled(false);

067	speakButton.setText("Recognizer not present");
068	}

069	}
070

071	/**
072	* Handle the click on the start recognition button.

073	*/
074	public void onClick(View v) {

075	if (v.getId() == R.id.btn_speak) {
076	startVoiceRecognitionActivity();

077	}
078	}

079
080	/**

081	* Fire an intent to start the speech recognition activity.
082	*/

083	private void startVoiceRecognitionActivity() {
084	Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);

085	intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
086	RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);

087	intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Speech recognition demo");
088	startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);

089	}
090

091	/**
092	* Handle the results from the recognition activity.

093	*/
094	@Override

095	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
096		if (requestCode == VOICE_RECOGNITION_REQUEST_CODE && resultCode == RESULT_OK) {

097	// Fill the list view with the strings the recognizer thought it could have heard
098	ArrayList matches = data.getStringArrayListExtra(

099	RecognizerIntent.EXTRA_RESULTS);
100	mList.setAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1,

101	matches));
102	}

103
104	super.onActivityResult(requestCode, resultCode, data);

105	}
106	}