1/*
2 * Copyright (C) 2013 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.settings.location;
18
19import android.app.AppGlobals;
20import android.app.AppOpsManager;
21import android.content.Context;
22import android.content.pm.ApplicationInfo;
23import android.content.pm.PackageManager;
24import android.content.pm.IPackageManager;
25import android.content.res.Resources;
26import android.graphics.drawable.Drawable;
27import android.os.Bundle;
28import android.os.Process;
29import android.os.RemoteException;
30import android.os.UserHandle;
31import android.os.UserManager;
32import android.preference.Preference;
33import android.util.Log;
34
35import com.android.settings.DimmableIconPreference;
36import com.android.settings.R;
37import com.android.settings.SettingsActivity;
38import com.android.settings.applications.InstalledAppDetails;
39
40import java.util.ArrayList;
41import java.util.List;
42
43/**
44 * Retrieves the information of applications which accessed location recently.
45 */
46public class RecentLocationApps {
47    private static final String TAG = RecentLocationApps.class.getSimpleName();
48    private static final String ANDROID_SYSTEM_PACKAGE_NAME = "android";
49
50    private static final int RECENT_TIME_INTERVAL_MILLIS = 15 * 60 * 1000;
51
52    private final SettingsActivity mActivity;
53    private final PackageManager mPackageManager;
54
55    public RecentLocationApps(SettingsActivity activity) {
56        mActivity = activity;
57        mPackageManager = activity.getPackageManager();
58    }
59
60    private class PackageEntryClickedListener
61            implements Preference.OnPreferenceClickListener {
62        private String mPackage;
63        private UserHandle mUserHandle;
64
65        public PackageEntryClickedListener(String packageName, UserHandle userHandle) {
66            mPackage = packageName;
67            mUserHandle = userHandle;
68        }
69
70        @Override
71        public boolean onPreferenceClick(Preference preference) {
72            // start new fragment to display extended information
73            Bundle args = new Bundle();
74            args.putString(InstalledAppDetails.ARG_PACKAGE_NAME, mPackage);
75            mActivity.startPreferencePanelAsUser(InstalledAppDetails.class.getName(), args,
76                    R.string.application_info_label, null, mUserHandle);
77            return true;
78        }
79    }
80
81    private DimmableIconPreference createRecentLocationEntry(
82            Drawable icon,
83            CharSequence label,
84            boolean isHighBattery,
85            CharSequence contentDescription,
86            Preference.OnPreferenceClickListener listener) {
87        DimmableIconPreference pref = new DimmableIconPreference(mActivity, contentDescription);
88        pref.setIcon(icon);
89        pref.setTitle(label);
90        if (isHighBattery) {
91            pref.setSummary(R.string.location_high_battery_use);
92        } else {
93            pref.setSummary(R.string.location_low_battery_use);
94        }
95        pref.setOnPreferenceClickListener(listener);
96        return pref;
97    }
98
99    /**
100     * Fills a list of applications which queried location recently within specified time.
101     */
102    public List<Preference> getAppList() {
103        // Retrieve a location usage list from AppOps
104        AppOpsManager aoManager =
105                (AppOpsManager) mActivity.getSystemService(Context.APP_OPS_SERVICE);
106        List<AppOpsManager.PackageOps> appOps = aoManager.getPackagesForOps(new int[] {
107                AppOpsManager.OP_MONITOR_LOCATION, AppOpsManager.OP_MONITOR_HIGH_POWER_LOCATION, });
108
109        // Process the AppOps list and generate a preference list.
110        ArrayList<Preference> prefs = new ArrayList<Preference>();
111        final long now = System.currentTimeMillis();
112        final UserManager um = (UserManager) mActivity.getSystemService(Context.USER_SERVICE);
113        final List<UserHandle> profiles = um.getUserProfiles();
114
115        final int appOpsN = appOps.size();
116        for (int i = 0; i < appOpsN; ++i) {
117            AppOpsManager.PackageOps ops = appOps.get(i);
118            // Don't show the Android System in the list - it's not actionable for the user.
119            // Also don't show apps belonging to background users except managed users.
120            String packageName = ops.getPackageName();
121            int uid = ops.getUid();
122            int userId = UserHandle.getUserId(uid);
123            boolean isAndroidOs =
124                    (uid == Process.SYSTEM_UID) && ANDROID_SYSTEM_PACKAGE_NAME.equals(packageName);
125            if (isAndroidOs || !profiles.contains(new UserHandle(userId))) {
126                continue;
127            }
128            Preference preference = getPreferenceFromOps(um, now, ops);
129            if (preference != null) {
130                prefs.add(preference);
131            }
132        }
133
134        return prefs;
135    }
136
137    /**
138     * Creates a Preference entry for the given PackageOps.
139     *
140     * This method examines the time interval of the PackageOps first. If the PackageOps is older
141     * than the designated interval, this method ignores the PackageOps object and returns null.
142     * When the PackageOps is fresh enough, this method returns a Preference pointing to the App
143     * Info page for that package.
144     */
145    private Preference getPreferenceFromOps(final UserManager um, long now,
146            AppOpsManager.PackageOps ops) {
147        String packageName = ops.getPackageName();
148        List<AppOpsManager.OpEntry> entries = ops.getOps();
149        boolean highBattery = false;
150        boolean normalBattery = false;
151        // Earliest time for a location request to end and still be shown in list.
152        long recentLocationCutoffTime = now - RECENT_TIME_INTERVAL_MILLIS;
153        for (AppOpsManager.OpEntry entry : entries) {
154            if (entry.isRunning() || entry.getTime() >= recentLocationCutoffTime) {
155                switch (entry.getOp()) {
156                    case AppOpsManager.OP_MONITOR_LOCATION:
157                        normalBattery = true;
158                        break;
159                    case AppOpsManager.OP_MONITOR_HIGH_POWER_LOCATION:
160                        highBattery = true;
161                        break;
162                    default:
163                        break;
164                }
165            }
166        }
167
168        if (!highBattery && !normalBattery) {
169            if (Log.isLoggable(TAG, Log.VERBOSE)) {
170                Log.v(TAG, packageName + " hadn't used location within the time interval.");
171            }
172            return null;
173        }
174
175        // The package is fresh enough, continue.
176
177        int uid = ops.getUid();
178        int userId = UserHandle.getUserId(uid);
179
180        DimmableIconPreference preference = null;
181        try {
182            IPackageManager ipm = AppGlobals.getPackageManager();
183            ApplicationInfo appInfo =
184                    ipm.getApplicationInfo(packageName, PackageManager.GET_META_DATA, userId);
185            if (appInfo == null) {
186                Log.w(TAG, "Null application info retrieved for package " + packageName
187                        + ", userId " + userId);
188                return null;
189            }
190            Resources res = mActivity.getResources();
191
192            final UserHandle userHandle = new UserHandle(userId);
193            Drawable appIcon = mPackageManager.getApplicationIcon(appInfo);
194            Drawable icon = mPackageManager.getUserBadgedIcon(appIcon, userHandle);
195            CharSequence appLabel = mPackageManager.getApplicationLabel(appInfo);
196            CharSequence badgedAppLabel = mPackageManager.getUserBadgedLabel(appLabel, userHandle);
197            if (appLabel.toString().contentEquals(badgedAppLabel)) {
198                // If badged label is not different from original then no need for it as
199                // a separate content description.
200                badgedAppLabel = null;
201            }
202            preference = createRecentLocationEntry(icon,
203                    appLabel, highBattery, badgedAppLabel,
204                    new PackageEntryClickedListener(packageName, userHandle));
205        } catch (RemoteException e) {
206            Log.w(TAG, "Error while retrieving application info for package " + packageName
207                    + ", userId " + userId, e);
208        }
209
210        return preference;
211    }
212}
213