Android实现语音识别
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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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