1 /*
2  * Copyright (C) 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 package com.android.settings.connecteddevice;
17 
18 import android.bluetooth.BluetoothAdapter;
19 import android.content.BroadcastReceiver;
20 import android.content.Context;
21 import android.content.Intent;
22 import android.content.IntentFilter;
23 import android.content.pm.PackageManager;
24 
25 import androidx.preference.Preference;
26 import androidx.preference.PreferenceScreen;
27 
28 import com.android.settings.R;
29 import com.android.settings.core.BasePreferenceController;
30 import com.android.settingslib.core.lifecycle.LifecycleObserver;
31 import com.android.settingslib.core.lifecycle.events.OnStart;
32 import com.android.settingslib.core.lifecycle.events.OnStop;
33 
34 /**
35  * Controller to maintain the {@link androidx.preference.Preference} for add
36  * device. It monitor Bluetooth's status(on/off) and decide if need to show summary or not.
37  */
38 public class AddDevicePreferenceController extends BasePreferenceController
39         implements LifecycleObserver, OnStart, OnStop {
40 
41     private Preference mPreference;
42     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
43         @Override
44         public void onReceive(Context context, Intent intent) {
45             updateState();
46         }
47     };
48     private IntentFilter mIntentFilter;
49     private BluetoothAdapter mBluetoothAdapter;
50 
AddDevicePreferenceController(Context context, String key)51     public AddDevicePreferenceController(Context context, String key) {
52         super(context, key);
53         mIntentFilter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
54         mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
55     }
56 
57     @Override
onStart()58     public void onStart() {
59         mContext.registerReceiver(mReceiver, mIntentFilter);
60     }
61 
62     @Override
onStop()63     public void onStop() {
64         mContext.unregisterReceiver(mReceiver);
65     }
66 
67     @Override
displayPreference(PreferenceScreen screen)68     public void displayPreference(PreferenceScreen screen) {
69         super.displayPreference(screen);
70         if (isAvailable()) {
71             mPreference = screen.findPreference(getPreferenceKey());
72         }
73     }
74 
75     @Override
getAvailabilityStatus()76     public int getAvailabilityStatus() {
77         return mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)
78                 ? AVAILABLE
79                 : UNSUPPORTED_ON_DEVICE;
80     }
81 
82     @Override
getSummary()83     public CharSequence getSummary() {
84         return mBluetoothAdapter != null && mBluetoothAdapter.isEnabled()
85                 ? ""
86                 : mContext.getString(R.string.connected_device_add_device_summary);
87     }
88 
updateState()89     void updateState() {
90         updateState(mPreference);
91     }
92 }
93