LocationControllerImpl.java revision fab2e2cbaab77d85c708ede54029b46d938f8e66 
1/*
2 * Copyright (C) 2008 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.systemui.statusbar.policy;
18
19import android.app.ActivityManager;
20import android.app.AppOpsManager;
21import android.app.StatusBarManager;
22import android.content.BroadcastReceiver;
23import android.content.ContentResolver;
24import android.content.Context;
25import android.content.Intent;
26import android.content.IntentFilter;
27import android.location.LocationManager;
28import android.os.Handler;
29import android.os.Looper;
30import android.os.Message;
31import android.os.UserHandle;
32import android.os.UserManager;
33import android.provider.Settings;
34import android.support.annotation.VisibleForTesting;
35
36import com.android.systemui.R;
37import com.android.systemui.util.Utils;
38
39import java.util.ArrayList;
40import java.util.List;
41
42import static com.android.settingslib.Utils.updateLocationMode;
43
44/**
45 * A controller to manage changes of location related states and update the views accordingly.
46 */
47public class LocationControllerImpl extends BroadcastReceiver implements LocationController {
48
49    private static final int[] mHighPowerRequestAppOpArray
50        = new int[] {AppOpsManager.OP_MONITOR_HIGH_POWER_LOCATION};
51
52    private Context mContext;
53
54    private AppOpsManager mAppOpsManager;
55    private StatusBarManager mStatusBarManager;
56
57    private boolean mAreActiveLocationRequests;
58
59    private ArrayList<LocationChangeCallback> mSettingsChangeCallbacks =
60            new ArrayList<LocationChangeCallback>();
61    private final H mHandler = new H();
62
63    public LocationControllerImpl(Context context, Looper bgLooper) {
64        mContext = context;
65
66        // Register to listen for changes in location settings.
67        IntentFilter filter = new IntentFilter();
68        filter.addAction(LocationManager.HIGH_POWER_REQUEST_CHANGE_ACTION);
69        filter.addAction(LocationManager.MODE_CHANGED_ACTION);
70        context.registerReceiverAsUser(this, UserHandle.ALL, filter, null, new Handler(bgLooper));
71
72        mAppOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
73        mStatusBarManager
74                = (StatusBarManager) context.getSystemService(Context.STATUS_BAR_SERVICE);
75
76        // Examine the current location state and initialize the status view.
77        updateActiveLocationRequests();
78    }
79
80    /**
81     * Add a callback to listen for changes in location settings.
82     */
83    public void addCallback(LocationChangeCallback cb) {
84        mSettingsChangeCallbacks.add(cb);
85        mHandler.sendEmptyMessage(H.MSG_LOCATION_SETTINGS_CHANGED);
86    }
87
88    public void removeCallback(LocationChangeCallback cb) {
89        mSettingsChangeCallbacks.remove(cb);
90    }
91
92    /**
93     * Enable or disable location in settings.
94     *
95     * <p>This will attempt to enable/disable every type of location setting
96     * (e.g. high and balanced power).
97     *
98     * <p>If enabling, a user consent dialog will pop up prompting the user to accept.
99     * If the user doesn't accept, network location won't be enabled.
100     *
101     * @return true if attempt to change setting was successful.
102     */
103    public boolean setLocationEnabled(boolean enabled) {
104        int currentUserId = ActivityManager.getCurrentUser();
105        if (isUserLocationRestricted(currentUserId)) {
106            return false;
107        }
108        final ContentResolver cr = mContext.getContentResolver();
109        // When enabling location, a user consent dialog will pop up, and the
110        // setting won't be fully enabled until the user accepts the agreement.
111        int currentMode = Settings.Secure.getIntForUser(cr, Settings.Secure.LOCATION_MODE,
112                Settings.Secure.LOCATION_MODE_OFF, currentUserId);
113        int mode = enabled
114                ? Settings.Secure.LOCATION_MODE_PREVIOUS : Settings.Secure.LOCATION_MODE_OFF;
115        // QuickSettings always runs as the owner, so specifically set the settings
116        // for the current foreground user.
117        return updateLocationMode(mContext, currentMode, mode, currentUserId);
118    }
119
120    /**
121     * Returns true if location isn't disabled in settings.
122     */
123    public boolean isLocationEnabled() {
124        ContentResolver resolver = mContext.getContentResolver();
125        // QuickSettings always runs as the owner, so specifically retrieve the settings
126        // for the current foreground user.
127        int mode = Settings.Secure.getIntForUser(resolver, Settings.Secure.LOCATION_MODE,
128                Settings.Secure.LOCATION_MODE_OFF, ActivityManager.getCurrentUser());
129        return mode != Settings.Secure.LOCATION_MODE_OFF;
130    }
131
132    @Override
133    public boolean isLocationActive() {
134        return mAreActiveLocationRequests;
135    }
136
137    /**
138     * Returns true if the current user is restricted from using location.
139     */
140    private boolean isUserLocationRestricted(int userId) {
141        final UserManager um = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
142        return um.hasUserRestriction(UserManager.DISALLOW_SHARE_LOCATION,
143                UserHandle.of(userId));
144    }
145
146    /**
147     * Returns true if there currently exist active high power location requests.
148     */
149    @VisibleForTesting
150    protected boolean areActiveHighPowerLocationRequests() {
151        List<AppOpsManager.PackageOps> packages
152            = mAppOpsManager.getPackagesForOps(mHighPowerRequestAppOpArray);
153        // AppOpsManager can return null when there is no requested data.
154        if (packages != null) {
155            final int numPackages = packages.size();
156            for (int packageInd = 0; packageInd < numPackages; packageInd++) {
157                AppOpsManager.PackageOps packageOp = packages.get(packageInd);
158                List<AppOpsManager.OpEntry> opEntries = packageOp.getOps();
159                if (opEntries != null) {
160                    final int numOps = opEntries.size();
161                    for (int opInd = 0; opInd < numOps; opInd++) {
162                        AppOpsManager.OpEntry opEntry = opEntries.get(opInd);
163                        // AppOpsManager should only return OP_MONITOR_HIGH_POWER_LOCATION because
164                        // of the mHighPowerRequestAppOpArray filter, but checking defensively.
165                        if (opEntry.getOp() == AppOpsManager.OP_MONITOR_HIGH_POWER_LOCATION) {
166                            if (opEntry.isRunning()) {
167                                return true;
168                            }
169                        }
170                    }
171                }
172            }
173        }
174
175        return false;
176    }
177
178    // Reads the active location requests and updates the status view if necessary.
179    private void updateActiveLocationRequests() {
180        boolean hadActiveLocationRequests = mAreActiveLocationRequests;
181        mAreActiveLocationRequests = areActiveHighPowerLocationRequests();
182        if (mAreActiveLocationRequests != hadActiveLocationRequests) {
183            mHandler.sendEmptyMessage(H.MSG_LOCATION_ACTIVE_CHANGED);
184        }
185    }
186
187    @Override
188    public void onReceive(Context context, Intent intent) {
189        final String action = intent.getAction();
190        if (LocationManager.HIGH_POWER_REQUEST_CHANGE_ACTION.equals(action)) {
191            updateActiveLocationRequests();
192        } else if (LocationManager.MODE_CHANGED_ACTION.equals(action)) {
193            mHandler.sendEmptyMessage(H.MSG_LOCATION_SETTINGS_CHANGED);
194        }
195    }
196
197    private final class H extends Handler {
198        private static final int MSG_LOCATION_SETTINGS_CHANGED = 1;
199        private static final int MSG_LOCATION_ACTIVE_CHANGED = 2;
200
201        @Override
202        public void handleMessage(Message msg) {
203            switch (msg.what) {
204                case MSG_LOCATION_SETTINGS_CHANGED:
205                    locationSettingsChanged();
206                    break;
207                case MSG_LOCATION_ACTIVE_CHANGED:
208                    locationActiveChanged();
209                    break;
210            }
211        }
212
213        private void locationActiveChanged() {
214            Utils.safeForeach(mSettingsChangeCallbacks,
215                    cb -> cb.onLocationActiveChanged(mAreActiveLocationRequests));
216        }
217
218        private void locationSettingsChanged() {
219            boolean isEnabled = isLocationEnabled();
220            Utils.safeForeach(mSettingsChangeCallbacks,
221                    cb -> cb.onLocationSettingsChanged(isEnabled));
222        }
223    }
224}
225