1/*
2 * Copyright (C) 2015 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.settingslib.location;
18
19import android.app.AppGlobals;
20import android.app.AppOpsManager;
21import android.content.Context;
22import android.content.pm.ApplicationInfo;
23import android.content.pm.IPackageManager;
24import android.content.pm.PackageManager;
25import android.graphics.drawable.Drawable;
26import android.os.Process;
27import android.os.RemoteException;
28import android.os.UserHandle;
29import android.os.UserManager;
30import android.util.Log;
31
32import java.util.ArrayList;
33import java.util.List;
34
35/**
36 * Retrieves the information of applications which accessed location recently.
37 */
38public class RecentLocationApps {
39    private static final String TAG = RecentLocationApps.class.getSimpleName();
40    private static final String ANDROID_SYSTEM_PACKAGE_NAME = "android";
41
42    private static final int RECENT_TIME_INTERVAL_MILLIS = 15 * 60 * 1000;
43
44    private static final int[] LOCATION_OPS = new int[] {
45            AppOpsManager.OP_MONITOR_LOCATION,
46            AppOpsManager.OP_MONITOR_HIGH_POWER_LOCATION,
47    };
48
49    private final PackageManager mPackageManager;
50    private final Context mContext;
51
52    public RecentLocationApps(Context context) {
53        mContext = context;
54        mPackageManager = context.getPackageManager();
55    }
56
57    /**
58     * Fills a list of applications which queried location recently within specified time.
59     */
60    public List<Request> getAppList() {
61        // Retrieve a location usage list from AppOps
62        AppOpsManager aoManager =
63                (AppOpsManager) mContext.getSystemService(Context.APP_OPS_SERVICE);
64        List<AppOpsManager.PackageOps> appOps = aoManager.getPackagesForOps(LOCATION_OPS);
65
66        final int appOpsCount = appOps != null ? appOps.size() : 0;
67
68        // Process the AppOps list and generate a preference list.
69        ArrayList<Request> requests = new ArrayList<>(appOpsCount);
70        final long now = System.currentTimeMillis();
71        final UserManager um = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
72        final List<UserHandle> profiles = um.getUserProfiles();
73
74        for (int i = 0; i < appOpsCount; ++i) {
75            AppOpsManager.PackageOps ops = appOps.get(i);
76            // Don't show the Android System in the list - it's not actionable for the user.
77            // Also don't show apps belonging to background users except managed users.
78            String packageName = ops.getPackageName();
79            int uid = ops.getUid();
80            int userId = UserHandle.getUserId(uid);
81            boolean isAndroidOs =
82                    (uid == Process.SYSTEM_UID) && ANDROID_SYSTEM_PACKAGE_NAME.equals(packageName);
83            if (isAndroidOs || !profiles.contains(new UserHandle(userId))) {
84                continue;
85            }
86            Request request = getRequestFromOps(now, ops);
87            if (request != null) {
88                requests.add(request);
89            }
90        }
91
92        return requests;
93    }
94
95    /**
96     * Creates a Request entry for the given PackageOps.
97     *
98     * This method examines the time interval of the PackageOps first. If the PackageOps is older
99     * than the designated interval, this method ignores the PackageOps object and returns null.
100     * When the PackageOps is fresh enough, this method returns a Request object for the package
101     */
102    private Request getRequestFromOps(long now,
103            AppOpsManager.PackageOps ops) {
104        String packageName = ops.getPackageName();
105        List<AppOpsManager.OpEntry> entries = ops.getOps();
106        boolean highBattery = false;
107        boolean normalBattery = false;
108        // Earliest time for a location request to end and still be shown in list.
109        long recentLocationCutoffTime = now - RECENT_TIME_INTERVAL_MILLIS;
110        for (AppOpsManager.OpEntry entry : entries) {
111            if (entry.isRunning() || entry.getTime() >= recentLocationCutoffTime) {
112                switch (entry.getOp()) {
113                    case AppOpsManager.OP_MONITOR_LOCATION:
114                        normalBattery = true;
115                        break;
116                    case AppOpsManager.OP_MONITOR_HIGH_POWER_LOCATION:
117                        highBattery = true;
118                        break;
119                    default:
120                        break;
121                }
122            }
123        }
124
125        if (!highBattery && !normalBattery) {
126            if (Log.isLoggable(TAG, Log.VERBOSE)) {
127                Log.v(TAG, packageName + " hadn't used location within the time interval.");
128            }
129            return null;
130        }
131
132        // The package is fresh enough, continue.
133
134        int uid = ops.getUid();
135        int userId = UserHandle.getUserId(uid);
136
137        Request request = null;
138        try {
139            IPackageManager ipm = AppGlobals.getPackageManager();
140            ApplicationInfo appInfo =
141                    ipm.getApplicationInfo(packageName, PackageManager.GET_META_DATA, userId);
142            if (appInfo == null) {
143                Log.w(TAG, "Null application info retrieved for package " + packageName
144                        + ", userId " + userId);
145                return null;
146            }
147
148            final UserHandle userHandle = new UserHandle(userId);
149            Drawable appIcon = mPackageManager.getApplicationIcon(appInfo);
150            Drawable icon = mPackageManager.getUserBadgedIcon(appIcon, userHandle);
151            CharSequence appLabel = mPackageManager.getApplicationLabel(appInfo);
152            CharSequence badgedAppLabel = mPackageManager.getUserBadgedLabel(appLabel, userHandle);
153            if (appLabel.toString().contentEquals(badgedAppLabel)) {
154                // If badged label is not different from original then no need for it as
155                // a separate content description.
156                badgedAppLabel = null;
157            }
158            request = new Request(packageName, userHandle, icon, appLabel, highBattery,
159                    badgedAppLabel);
160        } catch (RemoteException e) {
161            Log.w(TAG, "Error while retrieving application info for package " + packageName
162                    + ", userId " + userId, e);
163        }
164
165        return request;
166    }
167
168    public static class Request {
169        public final String packageName;
170        public final UserHandle userHandle;
171        public final Drawable icon;
172        public final CharSequence label;
173        public final boolean isHighBattery;
174        public final CharSequence contentDescription;
175
176        private Request(String packageName, UserHandle userHandle, Drawable icon,
177                CharSequence label, boolean isHighBattery, CharSequence contentDescription) {
178            this.packageName = packageName;
179            this.userHandle = userHandle;
180            this.icon = icon;
181            this.label = label;
182            this.isHighBattery = isHighBattery;
183            this.contentDescription = contentDescription;
184        }
185    }
186}
187