Android实现语音识别

苹果的iphone的语音识别功能使用的是Google的技术，做为Google力推的Android自然会将其核心技术植入到Android系统里面，并结合google的云端技术将其发扬光大。

所以Google Voice Recognition在Android中的实现就变得非常轻松。

Android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：

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);    }}

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