轻松实现Android语音识别功能

* 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** <a href="http://www.apache.org/licenses/LICENSE-2.0" rel="nofollow" target="_blank">http://www.apache.org/licenses/LICENSE-2.0</a>** 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.*/@Overridepublic 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 interactionButton speakButton = (Button) findViewById(R.id.btn_speak);mList = (ListView) findViewById(R.id.list);// Check to see if a recognition activity is presentPackageManager pm = getPackageManager();List 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.*/@Overrideprotected 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 heardArrayList matches = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);mList.setAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1,matches));}super.onActivityResult(requestCode, resultCode, data);}}