RecognitionManagerService.java revision f80a9b2f8a841d32c7398ebbf4cba82b02e9f167 
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
17package com.android.server;
18
19import com.android.internal.content.PackageMonitor;
20
21import android.app.AppGlobals;
22import android.content.BroadcastReceiver;
23import android.content.ComponentName;
24import android.content.Context;
25import android.content.Intent;
26import android.content.IntentFilter;
27import android.content.pm.IPackageManager;
28import android.content.pm.ResolveInfo;
29import android.content.pm.ServiceInfo;
30import android.os.Binder;
31import android.os.RemoteException;
32import android.os.UserHandle;
33import android.provider.Settings;
34import android.speech.RecognitionService;
35import android.text.TextUtils;
36import android.util.Slog;
37
38import java.util.List;
39
40public class RecognitionManagerService extends Binder {
41    final static String TAG = "RecognitionManagerService";
42
43    private final Context mContext;
44    private final MyPackageMonitor mMonitor;
45    private final IPackageManager mIPm;
46
47    private static final boolean DEBUG = false;
48
49    class MyPackageMonitor extends PackageMonitor {
50        public void onSomePackagesChanged() {
51            int userHandle = getChangingUserId();
52            if (DEBUG) Slog.i(TAG, "onSomePackagesChanged user=" + userHandle);
53            ComponentName comp = getCurRecognizer(userHandle);
54            if (comp == null) {
55                if (anyPackagesAppearing()) {
56                    comp = findAvailRecognizer(null, userHandle);
57                    if (comp != null) {
58                        setCurRecognizer(comp, userHandle);
59                    }
60                }
61                return;
62            }
63
64            int change = isPackageDisappearing(comp.getPackageName());
65            if (change == PACKAGE_PERMANENT_CHANGE
66                    || change == PACKAGE_TEMPORARY_CHANGE) {
67                setCurRecognizer(findAvailRecognizer(null, userHandle), userHandle);
68
69            } else if (isPackageModified(comp.getPackageName())) {
70                setCurRecognizer(findAvailRecognizer(comp.getPackageName(), userHandle),
71                        userHandle);
72            }
73        }
74    }
75
76    RecognitionManagerService(Context context) {
77        mContext = context;
78        mMonitor = new MyPackageMonitor();
79        mMonitor.register(context, null, UserHandle.ALL, true);
80        mIPm = AppGlobals.getPackageManager();
81        mContext.registerReceiverAsUser(mBroadcastReceiver, UserHandle.ALL,
82                new IntentFilter(Intent.ACTION_BOOT_COMPLETED), null, null);
83    }
84
85    public void systemReady() {
86        initForUser(UserHandle.USER_OWNER);
87    }
88
89    private void initForUser(int userHandle) {
90        if (DEBUG) Slog.i(TAG, "initForUser user=" + userHandle);
91        ComponentName comp = getCurRecognizer(userHandle);
92        if (comp != null) {
93            // See if the current recognizer is no longer available.
94            try {
95                mIPm.getServiceInfo(comp, 0, userHandle);
96            } catch (RemoteException e) {
97                comp = findAvailRecognizer(null, userHandle);
98                if (comp != null) {
99                    setCurRecognizer(comp, userHandle);
100                }
101            }
102        } else {
103            comp = findAvailRecognizer(null, userHandle);
104            if (comp != null) {
105                setCurRecognizer(comp, userHandle);
106            }
107        }
108    }
109
110    ComponentName findAvailRecognizer(String prefPackage, int userHandle) {
111        List<ResolveInfo> available =
112                mContext.getPackageManager().queryIntentServicesAsUser(
113                        new Intent(RecognitionService.SERVICE_INTERFACE), 0, userHandle);
114        int numAvailable = available.size();
115
116        if (numAvailable == 0) {
117            Slog.w(TAG, "no available voice recognition services found for user " + userHandle);
118            return null;
119        } else {
120            if (prefPackage != null) {
121                for (int i=0; i<numAvailable; i++) {
122                    ServiceInfo serviceInfo = available.get(i).serviceInfo;
123                    if (prefPackage.equals(serviceInfo.packageName)) {
124                        return new ComponentName(serviceInfo.packageName, serviceInfo.name);
125                    }
126                }
127            }
128            if (numAvailable > 1) {
129                Slog.w(TAG, "more than one voice recognition service found, picking first");
130            }
131
132            ServiceInfo serviceInfo = available.get(0).serviceInfo;
133            return new ComponentName(serviceInfo.packageName, serviceInfo.name);
134        }
135    }
136
137    ComponentName getCurRecognizer(int userHandle) {
138        String curRecognizer = Settings.Secure.getStringForUser(
139                mContext.getContentResolver(),
140                Settings.Secure.VOICE_RECOGNITION_SERVICE, userHandle);
141        if (TextUtils.isEmpty(curRecognizer)) {
142            return null;
143        }
144        if (DEBUG) Slog.i(TAG, "getCurRecognizer curRecognizer=" + curRecognizer
145                + " user=" + userHandle);
146        return ComponentName.unflattenFromString(curRecognizer);
147    }
148
149    void setCurRecognizer(ComponentName comp, int userHandle) {
150        Settings.Secure.putStringForUser(mContext.getContentResolver(),
151                Settings.Secure.VOICE_RECOGNITION_SERVICE,
152                comp != null ? comp.flattenToShortString() : "", userHandle);
153        if (DEBUG) Slog.i(TAG, "setCurRecognizer comp=" + comp
154                + " user=" + userHandle);
155    }
156
157    BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
158        public void onReceive(Context context, Intent intent) {
159            String action = intent.getAction();
160            if (DEBUG) Slog.i(TAG, "received " + action);
161            if (Intent.ACTION_BOOT_COMPLETED.equals(action)) {
162                int userHandle = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, -1);
163                if (userHandle > 0) {
164                    initForUser(userHandle);
165                }
166            }
167        }
168    };
169}
170