Android example source code file (RecognitionManagerService.java)

This example Android source code file (RecognitionManagerService.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, binder, componentname, content, context, list, mypackagemonitor, namenotfoundexception, os, package_permanent_change, package_temporary_change, provider, recognitionmanagerservice, serviceinfo, speech, string, tag, util

The RecognitionManagerService.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.android.server;

import com.android.internal.content.PackageMonitor;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.content.pm.ServiceInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Binder;
import android.provider.Settings;
import android.speech.RecognitionService;
import android.text.TextUtils;
import android.util.Slog;

import java.util.List;

public class RecognitionManagerService extends Binder {
    final static String TAG = "RecognitionManagerService";
    
    final Context mContext;
    final MyPackageMonitor mMonitor;
    
    class MyPackageMonitor extends PackageMonitor {
        public void onSomePackagesChanged() {
            ComponentName comp = getCurRecognizer();
            if (comp == null) {
                if (anyPackagesAppearing()) {
                    comp = findAvailRecognizer(null);
                    if (comp != null) {
                        setCurRecognizer(comp);
                    }
                }
                return;
            }
            
            int change = isPackageDisappearing(comp.getPackageName()); 
            if (change == PACKAGE_PERMANENT_CHANGE
                    || change == PACKAGE_TEMPORARY_CHANGE) {
                setCurRecognizer(findAvailRecognizer(null));
                
            } else if (isPackageModified(comp.getPackageName())) {
                setCurRecognizer(findAvailRecognizer(comp.getPackageName()));
            }
        }
    }
    
    RecognitionManagerService(Context context) {
        mContext = context;
        mMonitor = new MyPackageMonitor();
        mMonitor.register(context, true);
    }
    
    public void systemReady() {
        ComponentName comp = getCurRecognizer();
        if (comp != null) {
            // See if the current recognizer is no longer available.
            try {
                mContext.getPackageManager().getServiceInfo(comp, 0);
            } catch (NameNotFoundException e) {
                setCurRecognizer(null);
            }
        } else {
            comp = findAvailRecognizer(null);
            if (comp != null) {
                setCurRecognizer(comp);
            }
        }
    }
    
    ComponentName findAvailRecognizer(String prefPackage) {
        List<ResolveInfo> available =
                mContext.getPackageManager().queryIntentServices(
                        new Intent(RecognitionService.SERVICE_INTERFACE), 0);
        int numAvailable = available.size();
    
        if (numAvailable == 0) {
            Slog.w(TAG, "no available voice recognition services found");
            return null;
        } else {
            if (prefPackage != null) {
                for (int i=0; i<numAvailable; i++) {
                    ServiceInfo serviceInfo = available.get(i).serviceInfo;
                    if (prefPackage.equals(serviceInfo.packageName)) {
                        return new ComponentName(serviceInfo.packageName, serviceInfo.name);
                    }
                }
            }
            if (numAvailable > 1) {
                Slog.w(TAG, "more than one voice recognition service found, picking first");
            }
    
            ServiceInfo serviceInfo = available.get(0).serviceInfo;
            return new ComponentName(serviceInfo.packageName, serviceInfo.name);
        }
    }
    
    ComponentName getCurRecognizer() {
        String curRecognizer = Settings.Secure.getString(
                mContext.getContentResolver(),
                Settings.Secure.VOICE_RECOGNITION_SERVICE);
        if (TextUtils.isEmpty(curRecognizer)) {
            return null;
        }
        return ComponentName.unflattenFromString(curRecognizer);
    }
    
    void setCurRecognizer(ComponentName comp) {
        Settings.Secure.putString(mContext.getContentResolver(),
                Settings.Secure.VOICE_RECOGNITION_SERVICE,
                comp != null ? comp.flattenToShortString() : "");
    }
}