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 Android教程網 >> Android技術 >> Android開發 >> 開發入門 >> Android 輕松實現語音識別

Android 輕松實現語音識別

日期:2016/3/13 17:13:31      編輯:開發入門

所以Google Voice Recognition在android 的實現就變得極其輕松。
語音識別,借助於雲端技術可以識別用戶的語音輸入,包括語音控制等技術,下面我們將利用Google 提供的Api 實現這一功能。
功能點為:通過用戶語音將用戶輸入的語音識別出來,並打印在列表上。
功能界面如下:


用戶通過點擊speak按鈕顯示界面:

用戶說完話後,將提交到雲端搜索:

在雲端搜索完成後,返回打印數據:


完整代碼如下:
/* 
* 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(
                
newIntent(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);
    }
}
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