Android 轻松实现语音识别

 

2010-11-12 17:01:51

标签：休闲 职场 Android 语音识别 移动开发

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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：

完整代码如下：

/* 

 * 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);

    }

}