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
37  * to show summary or not.
38  */
39 public class AddDevicePreferenceController extends BasePreferenceController
40         implements LifecycleObserver, OnStart, OnStop {
41 
42     private Preference mPreference;
43     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
44         @Override
45         public void onReceive(Context context, Intent intent) {
46             updateState(mPreference);
47         }
48     };
49     private IntentFilter mIntentFilter;
50     private BluetoothAdapter mBluetoothAdapter;
51 
AddDevicePreferenceController(Context context, String key)52     public AddDevicePreferenceController(Context context, String key) {
53         super(context, key);
54         mIntentFilter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
55         mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
56     }
57 
58     @Override
onStart()59     public void onStart() {
60         mContext.registerReceiver(mReceiver, mIntentFilter);
61     }
62 
63     @Override
onStop()64     public void onStop() {
65         mContext.unregisterReceiver(mReceiver);
66     }
67 
68     @Override
displayPreference(PreferenceScreen screen)69     public void displayPreference(PreferenceScreen screen) {
70         super.displayPreference(screen);
71         if (isAvailable()) {
72             mPreference = screen.findPreference(getPreferenceKey());
73             updateState(mPreference);
74         }
75     }
76 
77     @Override
getAvailabilityStatus()78     public int getAvailabilityStatus() {
79         return mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)
80                 ? AVAILABLE
81                 : UNSUPPORTED_ON_DEVICE;
82     }
83 
84     @Override
getSummary()85     public CharSequence getSummary() {
86         return isBluetoothEnabled()
87                 ? ""
88                 : mContext.getString(R.string.connected_device_add_device_summary);
89     }
90 
isBluetoothEnabled()91     protected boolean isBluetoothEnabled() {
92         return mBluetoothAdapter != null && mBluetoothAdapter.isEnabled();
93     }
94 }
95