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 
17 package com.android.settings.bluetooth;
18 
19 import android.app.ActivityManager;
20 import android.bluetooth.BluetoothAdapter;
21 import android.bluetooth.BluetoothDevice;
22 import android.content.Context;
23 import android.content.SharedPreferences;
24 import android.content.res.Configuration;
25 import android.text.TextUtils;
26 import android.util.Log;
27 
28 import androidx.annotation.Nullable;
29 
30 import com.android.settingslib.bluetooth.LocalBluetoothManager;
31 
32 /**
33  * LocalBluetoothPreferences provides an interface to the preferences
34  * related to Bluetooth.
35  */
36 final class LocalBluetoothPreferences {
37     private static final String TAG = "LocalBluetoothPreferences";
38     private static final boolean DEBUG = Utils.D;
39     private static final String SHARED_PREFERENCES_NAME = "bluetooth_settings";
40 
41     // If a device was picked from the device picker or was in discoverable mode
42     // in the last 60 seconds, show the pairing dialogs in foreground instead
43     // of raising notifications
44     private static final int GRACE_PERIOD_TO_SHOW_DIALOGS_IN_FOREGROUND = 60 * 1000;
45 
46     private static final String KEY_LAST_SELECTED_DEVICE = "last_selected_device";
47 
48     private static final String KEY_LAST_SELECTED_DEVICE_TIME = "last_selected_device_time";
49 
50     private static final String KEY_DISCOVERABLE_END_TIMESTAMP = "discoverable_end_timestamp";
51 
LocalBluetoothPreferences()52     private LocalBluetoothPreferences() {
53     }
54 
getSharedPreferences(Context context)55     private static SharedPreferences getSharedPreferences(Context context) {
56         return context.getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE);
57     }
58 
getDiscoverableEndTimestamp(Context context)59     static long getDiscoverableEndTimestamp(Context context) {
60         return getSharedPreferences(context).getLong(
61                 KEY_DISCOVERABLE_END_TIMESTAMP, 0);
62     }
63 
shouldShowDialogInForeground(Context context, @Nullable BluetoothDevice device)64     static boolean shouldShowDialogInForeground(Context context, @Nullable BluetoothDevice device) {
65         String deviceAddress = device != null ? device.getAddress() : null;
66         String deviceName = device != null ? device.getName() : null;
67         LocalBluetoothManager manager = Utils.getLocalBtManager(context);
68         if (manager == null) {
69             if (DEBUG) Log.v(TAG, "manager == null - do not show dialog.");
70             return false;
71         }
72 
73         // If Bluetooth Settings is visible
74         if (manager.isForegroundActivity()) {
75             return true;
76         }
77 
78         // If in appliance mode, do not show dialog in foreground.
79         if ((context.getResources().getConfiguration().uiMode &
80                 Configuration.UI_MODE_TYPE_APPLIANCE) == Configuration.UI_MODE_TYPE_APPLIANCE) {
81             if (DEBUG) Log.v(TAG, "in appliance mode - do not show dialog.");
82             return false;
83         }
84 
85         long currentTimeMillis = System.currentTimeMillis();
86         SharedPreferences sharedPreferences = getSharedPreferences(context);
87 
88         // If the device was in discoverABLE mode recently
89         long lastDiscoverableEndTime = sharedPreferences.getLong(
90                 KEY_DISCOVERABLE_END_TIMESTAMP, 0);
91         if ((lastDiscoverableEndTime + GRACE_PERIOD_TO_SHOW_DIALOGS_IN_FOREGROUND)
92                 > currentTimeMillis) {
93             return true;
94         }
95 
96         // If the device was discoverING recently
97         BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
98         if (adapter != null) {
99             if (adapter.isDiscovering()) {
100                 return true;
101             }
102             if ((adapter.getDiscoveryEndMillis() +
103                 GRACE_PERIOD_TO_SHOW_DIALOGS_IN_FOREGROUND) > currentTimeMillis) {
104                 return true;
105             }
106         }
107 
108         // If the device was picked in the device picker recently
109         if (deviceAddress != null) {
110             String lastSelectedDevice = sharedPreferences.getString(
111                     KEY_LAST_SELECTED_DEVICE, null);
112 
113             if (deviceAddress.equals(lastSelectedDevice)) {
114                 long lastDeviceSelectedTime = sharedPreferences.getLong(
115                         KEY_LAST_SELECTED_DEVICE_TIME, 0);
116                 if ((lastDeviceSelectedTime + GRACE_PERIOD_TO_SHOW_DIALOGS_IN_FOREGROUND)
117                         > currentTimeMillis) {
118                     return true;
119                 }
120             }
121         }
122 
123 
124         if (!TextUtils.isEmpty(deviceName)) {
125             // If the device is a custom BT keyboard specifically for this device
126             String packagedKeyboardName = context.getString(
127                     com.android.internal.R.string.config_packagedKeyboardName);
128             if (deviceName.equals(packagedKeyboardName)) {
129                 if (DEBUG) Log.v(TAG, "showing dialog for packaged keyboard");
130                 return true;
131             }
132         }
133 
134         if (device != null) {
135             ActivityManager activityManager = context.getSystemService(ActivityManager.class);
136             String packageName = device.getPackageNameOfBondingApplication();
137 
138             if (packageName != null && activityManager.getPackageImportance(packageName)
139                     == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
140                 if (DEBUG) {
141                     Log.v(TAG, "showing dialog because the initiating application "
142                             + "is in foreground");
143                 }
144                 return true;
145             }
146         }
147 
148         if (DEBUG) Log.v(TAG, "Found no reason to show the dialog - do not show dialog.");
149         return false;
150     }
151 
persistSelectedDeviceInPicker(Context context, String deviceAddress)152     static void persistSelectedDeviceInPicker(Context context, String deviceAddress) {
153         SharedPreferences.Editor editor = getSharedPreferences(context).edit();
154         editor.putString(KEY_LAST_SELECTED_DEVICE,
155                 deviceAddress);
156         editor.putLong(KEY_LAST_SELECTED_DEVICE_TIME,
157                 System.currentTimeMillis());
158         editor.apply();
159     }
160 
persistDiscoverableEndTimestamp(Context context, long endTimestamp)161     static void persistDiscoverableEndTimestamp(Context context, long endTimestamp) {
162         SharedPreferences.Editor editor = getSharedPreferences(context).edit();
163         editor.putLong(KEY_DISCOVERABLE_END_TIMESTAMP, endTimestamp);
164         editor.apply();
165     }
166 }
167