Android實現語音識別

蘋果的iphone的語音識別功能使用的是Google的技術，做爲Google力推的Android自然會將其核心技術植入到Android系統裏面，並結合google的雲端技術將其發揚光大。

所以Google Voice Recognition在Android中的實現就變得非常輕鬆。

Android語音識別，藉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。

功能點爲：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：

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);
    }
}