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