Android 轻松实现语音识别

　　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);
    }
}
   
   
   
   

　　Tip：本篇 从Api Demo直接复制过来，必须有网络支持。