1 /*
2  * Copyright 2018 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 static android.os.UserManager.DISALLOW_BLUETOOTH;
20 import static android.os.UserManager.DISALLOW_CONFIG_BLUETOOTH;
21 
22 import android.bluetooth.BluetoothAdapter;
23 import android.car.drivingstate.CarUxRestrictions;
24 import android.content.BroadcastReceiver;
25 import android.content.Context;
26 import android.content.Intent;
27 import android.content.IntentFilter;
28 import android.content.pm.PackageManager;
29 import android.os.UserManager;
30 
31 import androidx.lifecycle.LifecycleObserver;
32 import androidx.preference.Preference;
33 
34 import com.android.car.settings.R;
35 import com.android.car.settings.common.FragmentController;
36 import com.android.car.settings.common.PreferenceController;
37 
38 /**
39  * Controls a preference that, when clicked, launches the page for pairing new Bluetooth devices.
40  * The associated preference for this controller should define the fragment attribute or an intent
41  * to launch for the Bluetooth device pairing page. If the adapter is not enabled, a click will
42  * enable Bluetooth. The summary message is updated to indicate this effect to the user.
43  */
44 public class PairNewDevicePreferenceController extends PreferenceController<Preference> implements
45         LifecycleObserver {
46 
47     private final UserManager mUserManager;
48     private final IntentFilter mIntentFilter = new IntentFilter(
49             BluetoothAdapter.ACTION_STATE_CHANGED);
50     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
51         @Override
52         public void onReceive(Context context, Intent intent) {
53             refreshUi();
54         }
55     };
56 
PairNewDevicePreferenceController(Context context, String preferenceKey, FragmentController fragmentController, CarUxRestrictions uxRestrictions)57     public PairNewDevicePreferenceController(Context context, String preferenceKey,
58             FragmentController fragmentController, CarUxRestrictions uxRestrictions) {
59         super(context, preferenceKey, fragmentController, uxRestrictions);
60         mUserManager = UserManager.get(context);
61     }
62 
63     @Override
getPreferenceType()64     protected Class<Preference> getPreferenceType() {
65         return Preference.class;
66     }
67 
68     @Override
checkInitialized()69     protected void checkInitialized() {
70         if (getPreference().getIntent() == null && getPreference().getFragment() == null) {
71             throw new IllegalStateException(
72                     "Preference should declare fragment or intent for page to pair new devices");
73         }
74     }
75 
76     @Override
getAvailabilityStatus()77     protected int getAvailabilityStatus() {
78         if (!getContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)) {
79             return UNSUPPORTED_ON_DEVICE;
80         }
81         return isUserRestricted() ? DISABLED_FOR_USER : AVAILABLE;
82     }
83 
isUserRestricted()84     private boolean isUserRestricted() {
85         return mUserManager.hasUserRestriction(DISALLOW_BLUETOOTH)
86                 || mUserManager.hasUserRestriction(DISALLOW_CONFIG_BLUETOOTH);
87     }
88 
89     @Override
onStartInternal()90     protected void onStartInternal() {
91         getContext().registerReceiver(mReceiver, mIntentFilter);
92     }
93 
94     @Override
onStopInternal()95     protected void onStopInternal() {
96         getContext().unregisterReceiver(mReceiver);
97     }
98 
99     @Override
updateState(Preference preference)100     protected void updateState(Preference preference) {
101         preference.setSummary(
102                 BluetoothAdapter.getDefaultAdapter().isEnabled() ? "" : getContext().getString(
103                         R.string.bluetooth_pair_new_device_summary));
104     }
105 
106     @Override
handlePreferenceClicked(Preference preference)107     protected boolean handlePreferenceClicked(Preference preference) {
108         // Enable the adapter if it is not on (user is notified via summary message).
109         BluetoothAdapter.getDefaultAdapter().enable();
110         return false; // Don't handle so that preference framework will launch pairing fragment.
111     }
112 }
113