Android example source code file (VoiceRecognitionService.java)

This example Android source code file (VoiceRecognitionService.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, arraylist, bundle, callback, content, os, override, remoteexception, runtimeexception, sharedpreferences, speech, string, util, voicerecognitionservice

The VoiceRecognitionService.java Android example source code

/*
 * Copyright (C) 2010 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.voicerecognitionservice;

import java.util.ArrayList;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.RemoteException;
import android.speech.SpeechRecognizer;
import android.speech.RecognitionService;

/**
 * A sample implementation of a {@link RecognitionService}. This very simple implementation does
 * no actual voice recognition. It just immediately returns fake recognition results.
 * Depending on the setting chosen in {@link VoiceRecognitionSettings}, it either returns a
 * list of letters ("a", "b", "c"), or a list of numbers ("1", "2", "3").
 */
public class VoiceRecognitionService extends RecognitionService {

    @Override
    protected void onCancel(Callback listener) {
        // A real recognizer would do something to shut down recognition here.
    }

    @Override
    protected void onStartListening(Intent recognizerIntent, Callback listener) {
        // A real recognizer would probably utilize a lot of the other listener callback
        // methods. But we'll just skip all that and pretend we've got a result.
        ArrayList<String> results = new ArrayList();
        
        SharedPreferences prefs = getSharedPreferences(
                VoiceRecognitionSettings.SHARED_PREFERENCES_NAME,
                Context.MODE_PRIVATE);
        
        String resultType = prefs.getString(
                VoiceRecognitionSettings.PREF_KEY_RESULTS_TYPE,
                String.valueOf(VoiceRecognitionSettings.RESULT_TYPE_LETTERS));
        int resultTypeInt = Integer.parseInt(resultType);
        
        if (resultTypeInt == VoiceRecognitionSettings.RESULT_TYPE_LETTERS) {
            results.add("a");
            results.add("b");
            results.add("c");            
        } else if (resultTypeInt == VoiceRecognitionSettings.RESULT_TYPE_NUMBERS) {
            results.add("1");
            results.add("2");
            results.add("3");
        }
        
        Bundle bundle = new Bundle();
        bundle.putStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION, results);
        
        try {
            listener.results(bundle);
        } catch (RemoteException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    protected void onStopListening(Callback listener) {
        // Not implemented - in this sample we assume recognition would be endpointed
        // automatically, though certain applications may wish to expose an affordance
        // for stopping recording manually.
    }
    
}