Android(安卓)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。

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