1 /*
2  * Copyright (C) 2016 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 static android.view.WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;
20 
21 import android.bluetooth.BluetoothDevice;
22 import android.content.BroadcastReceiver;
23 import android.content.Context;
24 import android.content.Intent;
25 import android.content.IntentFilter;
26 import android.os.Bundle;
27 
28 import androidx.annotation.Nullable;
29 import androidx.annotation.VisibleForTesting;
30 import androidx.fragment.app.FragmentActivity;
31 
32 /**
33  * BluetoothPairingDialog asks the user to enter a PIN / Passkey / simple confirmation
34  * for pairing with a remote Bluetooth device. It is an activity that appears as a dialog.
35  */
36 public class BluetoothPairingDialog extends FragmentActivity {
37     public static final String FRAGMENT_TAG = "bluetooth.pairing.fragment";
38 
39     private BluetoothPairingController mBluetoothPairingController;
40     private boolean mReceiverRegistered = false;
41 
42     /**
43      * Dismiss the dialog if the bond state changes to bonded or none,
44      * or if pairing was canceled for {@link BluetoothPairingController#mDevice}.
45      */
46     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
47         @Override
48         public void onReceive(Context context, Intent intent) {
49             String action = intent.getAction();
50             if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {
51                 int bondState = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE,
52                         BluetoothDevice.ERROR);
53                 if (bondState == BluetoothDevice.BOND_BONDED ||
54                         bondState == BluetoothDevice.BOND_NONE) {
55                     dismiss();
56                 }
57             } else if (BluetoothDevice.ACTION_PAIRING_CANCEL.equals(action)) {
58                 BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
59                 if (device == null || mBluetoothPairingController.deviceEquals(device)) {
60                     dismiss();
61                 }
62             }
63         }
64     };
65 
66     @Override
onCreate(@ullable Bundle savedInstanceState)67     protected void onCreate(@Nullable Bundle savedInstanceState) {
68         super.onCreate(savedInstanceState);
69 
70         getWindow().addSystemFlags(SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS);
71         Intent intent = getIntent();
72         if (intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE) == null) {
73             // Error handler for the case that dialog is started from adb command.
74             finish();
75             return;
76         }
77         mBluetoothPairingController = new BluetoothPairingController(intent, this);
78         // build the dialog fragment
79         boolean fragmentFound = true;
80         // check if the fragment has been preloaded
81         BluetoothPairingDialogFragment bluetoothFragment =
82             (BluetoothPairingDialogFragment) getSupportFragmentManager().
83                     findFragmentByTag(FRAGMENT_TAG);
84         // dismiss the fragment if it is already used
85         if (bluetoothFragment != null && (bluetoothFragment.isPairingControllerSet()
86             || bluetoothFragment.isPairingDialogActivitySet())) {
87             bluetoothFragment.dismiss();
88             bluetoothFragment = null;
89         }
90         // build a new fragment if it is null
91         if (bluetoothFragment == null) {
92             fragmentFound = false;
93             bluetoothFragment = new BluetoothPairingDialogFragment();
94         }
95         bluetoothFragment.setPairingController(mBluetoothPairingController);
96         bluetoothFragment.setPairingDialogActivity(this);
97         // pass the fragment to the manager when it is created from scratch
98         if (!fragmentFound) {
99             bluetoothFragment.show(getSupportFragmentManager(), FRAGMENT_TAG);
100         }
101         /*
102          * Leave this registered through pause/resume since we still want to
103          * finish the activity in the background if pairing is canceled.
104          */
105         registerReceiver(mReceiver, new IntentFilter(BluetoothDevice.ACTION_PAIRING_CANCEL));
106         registerReceiver(mReceiver, new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED));
107         mReceiverRegistered = true;
108 
109         closeSystemDialogs();
110     }
111 
112     @Override
onDestroy()113     protected void onDestroy() {
114         super.onDestroy();
115         if (mReceiverRegistered) {
116             mReceiverRegistered = false;
117             unregisterReceiver(mReceiver);
118         }
119     }
120 
121     @VisibleForTesting
dismiss()122     void dismiss() {
123         if (!isFinishing()) {
124             finish();
125         }
126     }
127 }
128