1 /*
2  * Copyright (C) 2017 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.Notification;
20 import android.app.NotificationChannel;
21 import android.app.NotificationManager;
22 import android.app.PendingIntent;
23 import android.app.Service;
24 import android.bluetooth.BluetoothDevice;
25 import android.content.BroadcastReceiver;
26 import android.content.Context;
27 import android.content.Intent;
28 import android.content.IntentFilter;
29 import android.content.res.Resources;
30 import android.os.IBinder;
31 import android.text.TextUtils;
32 import android.util.Log;
33 
34 import com.android.settings.R;
35 
36 /**
37  * BluetoothPairingService shows a notification if there is a pending bond request
38  * which can launch the appropriate pairing dialog when tapped.
39  */
40 public final class BluetoothPairingService extends Service {
41 
42     private static final int NOTIFICATION_ID = android.R.drawable.stat_sys_data_bluetooth;
43 
44     private static final String ACTION_DISMISS_PAIRING =
45             "com.android.settings.bluetooth.ACTION_DISMISS_PAIRING";
46 
47     private static final String BLUETOOTH_NOTIFICATION_CHANNEL =
48             "bluetooth_notification_channel";
49 
50     private static final String TAG = "BluetoothPairingService";
51 
52     private BluetoothDevice mDevice;
53 
getPairingDialogIntent(Context context, Intent intent)54     public static Intent getPairingDialogIntent(Context context, Intent intent) {
55         BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
56         int type = intent.getIntExtra(BluetoothDevice.EXTRA_PAIRING_VARIANT,
57                 BluetoothDevice.ERROR);
58         Intent pairingIntent = new Intent();
59         pairingIntent.setClass(context, BluetoothPairingDialog.class);
60         pairingIntent.putExtra(BluetoothDevice.EXTRA_DEVICE, device);
61         pairingIntent.putExtra(BluetoothDevice.EXTRA_PAIRING_VARIANT, type);
62         if (type == BluetoothDevice.PAIRING_VARIANT_PASSKEY_CONFIRMATION ||
63                 type == BluetoothDevice.PAIRING_VARIANT_DISPLAY_PASSKEY ||
64                 type == BluetoothDevice.PAIRING_VARIANT_DISPLAY_PIN) {
65             int pairingKey = intent.getIntExtra(BluetoothDevice.EXTRA_PAIRING_KEY,
66                     BluetoothDevice.ERROR);
67             pairingIntent.putExtra(BluetoothDevice.EXTRA_PAIRING_KEY, pairingKey);
68         }
69         pairingIntent.setAction(BluetoothDevice.ACTION_PAIRING_REQUEST);
70         pairingIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
71         return pairingIntent;
72     }
73 
74     private boolean mRegistered = false;
75     private final BroadcastReceiver mCancelReceiver = new BroadcastReceiver() {
76         @Override
77         public void onReceive(Context context, Intent intent) {
78             String action = intent.getAction();
79             if (action.equals(BluetoothDevice.ACTION_BOND_STATE_CHANGED)) {
80                 int bondState = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE,
81                         BluetoothDevice.ERROR);
82                 if ((bondState != BluetoothDevice.BOND_NONE) && (bondState != BluetoothDevice.BOND_BONDED)) {
83                     return;
84                 }
85             } else if (action.equals(ACTION_DISMISS_PAIRING)) {
86                 Log.d(TAG, "Notification cancel " + mDevice.getAddress() + " (" +
87                         mDevice.getName() + ")");
88                 mDevice.cancelPairing();
89             } else {
90                 int bondState = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE,
91                         BluetoothDevice.ERROR);
92                 Log.d(TAG, "Dismiss pairing for " + mDevice.getAddress() + " (" +
93                         mDevice.getName() + "), BondState: " + bondState);
94             }
95             stopForeground(true);
96             stopSelf();
97         }
98     };
99 
100     @Override
onCreate()101     public void onCreate() {
102       NotificationManager mgr = (NotificationManager)this
103          .getSystemService(Context.NOTIFICATION_SERVICE);
104       NotificationChannel notificationChannel = new NotificationChannel(
105          BLUETOOTH_NOTIFICATION_CHANNEL,
106          this.getString(R.string.bluetooth),
107          NotificationManager.IMPORTANCE_HIGH);
108       mgr.createNotificationChannel(notificationChannel);
109     }
110 
111     @Override
onStartCommand(Intent intent, int flags, int startId)112     public int onStartCommand(Intent intent, int flags, int startId) {
113         if (intent == null) {
114             Log.e(TAG, "Can't start: null intent!");
115             stopSelf();
116             return START_NOT_STICKY;
117         }
118 
119         Resources res = getResources();
120         Notification.Builder builder = new Notification.Builder(this,
121             BLUETOOTH_NOTIFICATION_CHANNEL)
122                 .setSmallIcon(android.R.drawable.stat_sys_data_bluetooth)
123                 .setTicker(res.getString(R.string.bluetooth_notif_ticker))
124                 .setLocalOnly(true);
125 
126         PendingIntent pairIntent = PendingIntent.getActivity(this, 0,
127                 getPairingDialogIntent(this, intent),
128                 PendingIntent.FLAG_ONE_SHOT | PendingIntent.FLAG_UPDATE_CURRENT);
129 
130         PendingIntent dismissIntent = PendingIntent.getBroadcast(this, 0,
131                 new Intent(ACTION_DISMISS_PAIRING), PendingIntent.FLAG_ONE_SHOT);
132 
133         mDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
134 
135         if (mDevice != null && mDevice.getBondState() != BluetoothDevice.BOND_BONDING) {
136             Log.w(TAG, "Device " + mDevice + " not bonding: " + mDevice.getBondState());
137             stopSelf();
138             return START_NOT_STICKY;
139         }
140 
141         String name = intent.getStringExtra(BluetoothDevice.EXTRA_NAME);
142         if (TextUtils.isEmpty(name)) {
143             BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
144             name = device != null ? device.getAlias() : res.getString(android.R.string.unknownName);
145         }
146 
147         Log.d(TAG, "Show pairing notification for " + mDevice.getAddress() + " (" + name + ")");
148 
149         Notification.Action pairAction = new Notification.Action.Builder(0,
150                 res.getString(R.string.bluetooth_device_context_pair_connect), pairIntent).build();
151         Notification.Action dismissAction = new Notification.Action.Builder(0,
152                 res.getString(android.R.string.cancel), dismissIntent).build();
153 
154         builder.setContentTitle(res.getString(R.string.bluetooth_notif_title))
155                 .setContentText(res.getString(R.string.bluetooth_notif_message, name))
156                 .setContentIntent(pairIntent)
157                 .setDefaults(Notification.DEFAULT_SOUND)
158                 .setColor(getColor(com.android.internal.R.color.system_notification_accent_color))
159                 .addAction(pairAction)
160                 .addAction(dismissAction);
161 
162         IntentFilter filter = new IntentFilter();
163         filter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
164         filter.addAction(BluetoothDevice.ACTION_PAIRING_CANCEL);
165         filter.addAction(ACTION_DISMISS_PAIRING);
166         registerReceiver(mCancelReceiver, filter);
167         mRegistered = true;
168 
169         startForeground(NOTIFICATION_ID, builder.getNotification());
170         return START_REDELIVER_INTENT;
171     }
172 
173     @Override
onDestroy()174     public void onDestroy() {
175         if (mRegistered) {
176             unregisterReceiver(mCancelReceiver);
177             mRegistered = false;
178         }
179         stopForeground(true);
180     }
181 
182     @Override
onBind(Intent intent)183     public IBinder onBind(Intent intent) {
184         // No binding.
185         return null;
186     }
187 }
188