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 import android.support.v7.preference.Preference; 25 import android.support.v7.preference.PreferenceScreen; 26 27 import com.android.settings.core.BasePreferenceController; 28 import com.android.settings.R; 29 import com.android.settingslib.core.lifecycle.LifecycleObserver; 30 import com.android.settingslib.core.lifecycle.events.OnStart; 31 import com.android.settingslib.core.lifecycle.events.OnStop; 32 33 /** 34 * Controller to maintain the {@link android.support.v7.preference.Preference} for add 35 * device. It monitor Bluetooth's status(on/off) and decide if need to show summary or not. 36 */ 37 public class AddDevicePreferenceController extends BasePreferenceController 38 implements LifecycleObserver, OnStart, OnStop { 39 40 private Preference mPreference; 41 private final BroadcastReceiver mReceiver = new BroadcastReceiver() { 42 @Override 43 public void onReceive(Context context, Intent intent) { 44 updateState(); 45 } 46 }; 47 private IntentFilter mIntentFilter; 48 private BluetoothAdapter mBluetoothAdapter; 49 AddDevicePreferenceController(Context context, String key)50 public AddDevicePreferenceController(Context context, String key) { 51 super(context, key); 52 mIntentFilter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED); 53 mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); 54 } 55 56 @Override onStart()57 public void onStart() { 58 mContext.registerReceiver(mReceiver, mIntentFilter); 59 } 60 61 @Override onStop()62 public void onStop() { 63 mContext.unregisterReceiver(mReceiver); 64 } 65 66 @Override displayPreference(PreferenceScreen screen)67 public void displayPreference(PreferenceScreen screen) { 68 super.displayPreference(screen); 69 if (isAvailable()) { 70 mPreference = (Preference) screen.findPreference(getPreferenceKey()); 71 } 72 } 73 74 @Override getAvailabilityStatus()75 public int getAvailabilityStatus() { 76 return mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH) 77 ? AVAILABLE 78 : UNSUPPORTED_ON_DEVICE; 79 } 80 81 @Override getSummary()82 public CharSequence getSummary() { 83 return mBluetoothAdapter != null && mBluetoothAdapter.isEnabled() 84 ? "" 85 : mContext.getString(R.string.connected_device_add_device_summary); 86 } 87 updateState()88 void updateState() { 89 updateState(mPreference); 90 } 91 } 92