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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.server;
     18 
     19 import com.android.internal.content.PackageMonitor;
     20 
     21 import android.content.ComponentName;
     22 import android.content.Context;
     23 import android.content.Intent;
     24 import android.content.pm.ResolveInfo;
     25 import android.content.pm.ServiceInfo;
     26 import android.content.pm.PackageManager.NameNotFoundException;
     27 import android.os.Binder;
     28 import android.provider.Settings;
     29 import android.speech.RecognitionService;
     30 import android.text.TextUtils;
     31 import android.util.Slog;
     32 
     33 import java.util.List;
     34 
     35 public class RecognitionManagerService extends Binder {
     36     final static String TAG = "RecognitionManagerService";
     37 
     38     final Context mContext;
     39     final MyPackageMonitor mMonitor;
     40 
     41     class MyPackageMonitor extends PackageMonitor {
     42         public void onSomePackagesChanged() {
     43             ComponentName comp = getCurRecognizer();
     44             if (comp == null) {
     45                 if (anyPackagesAppearing()) {
     46                     comp = findAvailRecognizer(null);
     47                     if (comp != null) {
     48                         setCurRecognizer(comp);
     49                     }
     50                 }
     51                 return;
     52             }
     53 
     54             int change = isPackageDisappearing(comp.getPackageName());
     55             if (change == PACKAGE_PERMANENT_CHANGE
     56                     || change == PACKAGE_TEMPORARY_CHANGE) {
     57                 setCurRecognizer(findAvailRecognizer(null));
     58 
     59             } else if (isPackageModified(comp.getPackageName())) {
     60                 setCurRecognizer(findAvailRecognizer(comp.getPackageName()));
     61             }
     62         }
     63     }
     64 
     65     RecognitionManagerService(Context context) {
     66         mContext = context;
     67         mMonitor = new MyPackageMonitor();
     68         mMonitor.register(context, true);
     69     }
     70 
     71     public void systemReady() {
     72         ComponentName comp = getCurRecognizer();
     73         if (comp != null) {
     74             // See if the current recognizer is no longer available.
     75             try {
     76                 mContext.getPackageManager().getServiceInfo(comp, 0);
     77             } catch (NameNotFoundException e) {
     78                 setCurRecognizer(null);
     79             }
     80         } else {
     81             comp = findAvailRecognizer(null);
     82             if (comp != null) {
     83                 setCurRecognizer(comp);
     84             }
     85         }
     86     }
     87 
     88     ComponentName findAvailRecognizer(String prefPackage) {
     89         List<ResolveInfo> available =
     90                 mContext.getPackageManager().queryIntentServices(
     91                         new Intent(RecognitionService.SERVICE_INTERFACE), 0);
     92         int numAvailable = available.size();
     93 
     94         if (numAvailable == 0) {
     95             Slog.w(TAG, "no available voice recognition services found");
     96             return null;
     97         } else {
     98             if (prefPackage != null) {
     99                 for (int i=0; i<numAvailable; i++) {
    100                     ServiceInfo serviceInfo = available.get(i).serviceInfo;
    101                     if (prefPackage.equals(serviceInfo.packageName)) {
    102                         return new ComponentName(serviceInfo.packageName, serviceInfo.name);
    103                     }
    104                 }
    105             }
    106             if (numAvailable > 1) {
    107                 Slog.w(TAG, "more than one voice recognition service found, picking first");
    108             }
    109 
    110             ServiceInfo serviceInfo = available.get(0).serviceInfo;
    111             return new ComponentName(serviceInfo.packageName, serviceInfo.name);
    112         }
    113     }
    114 
    115     ComponentName getCurRecognizer() {
    116         String curRecognizer = Settings.Secure.getString(
    117                 mContext.getContentResolver(),
    118                 Settings.Secure.VOICE_RECOGNITION_SERVICE);
    119         if (TextUtils.isEmpty(curRecognizer)) {
    120             return null;
    121         }
    122         return ComponentName.unflattenFromString(curRecognizer);
    123     }
    124 
    125     void setCurRecognizer(ComponentName comp) {
    126         Settings.Secure.putString(mContext.getContentResolver(),
    127                 Settings.Secure.VOICE_RECOGNITION_SERVICE,
    128                 comp != null ? comp.flattenToShortString() : "");
    129     }
    130 }
    131