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.car.settings.bluetooth;
18 
19 import android.annotation.Nullable;
20 import android.bluetooth.BluetoothDevice;
21 import android.content.BroadcastReceiver;
22 import android.content.Context;
23 import android.content.Intent;
24 import android.content.IntentFilter;
25 import android.os.Bundle;
26 
27 import androidx.annotation.VisibleForTesting;
28 import androidx.fragment.app.FragmentActivity;
29 
30 import com.android.settingslib.core.lifecycle.HideNonSystemOverlayMixin;
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         getLifecycle().addObserver(new HideNonSystemOverlayMixin(this));
71 
72         Intent intent = getIntent();
73         mBluetoothPairingController = new BluetoothPairingController(intent, this);
74         // build the dialog fragment
75         boolean fragmentFound = true;
76         // check if the fragment has been preloaded
77         BluetoothPairingDialogFragment bluetoothFragment =
78                 (BluetoothPairingDialogFragment) getSupportFragmentManager().findFragmentByTag(
79                         FRAGMENT_TAG);
80         // dismiss the fragment if it is already used
81         if (bluetoothFragment != null && (bluetoothFragment.isPairingControllerSet()
82                 || bluetoothFragment.isPairingDialogActivitySet())) {
83             bluetoothFragment.dismiss();
84             bluetoothFragment = null;
85         }
86         // build a new fragment if it is null
87         if (bluetoothFragment == null) {
88             fragmentFound = false;
89             bluetoothFragment = new BluetoothPairingDialogFragment();
90         }
91         bluetoothFragment.setPairingController(mBluetoothPairingController);
92         bluetoothFragment.setPairingDialogActivity(this);
93         // pass the fragment to the manager when it is created from scratch
94         if (!fragmentFound) {
95             bluetoothFragment.show(getSupportFragmentManager(), FRAGMENT_TAG);
96         }
97         /*
98          * Leave this registered through pause/resume since we still want to
99          * finish the activity in the background if pairing is canceled.
100          */
101         registerReceiver(mReceiver, new IntentFilter(BluetoothDevice.ACTION_PAIRING_CANCEL));
102         registerReceiver(mReceiver, new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED));
103         mReceiverRegistered = true;
104     }
105 
106     @Override
onDestroy()107     protected void onDestroy() {
108         super.onDestroy();
109         if (mReceiverRegistered) {
110             mReceiverRegistered = false;
111             unregisterReceiver(mReceiver);
112         }
113     }
114 
115     @VisibleForTesting
dismiss()116     void dismiss() {
117         if (!isFinishing()) {
118             finish();
119         }
120     }
121 }
122