1 /* 2 * Copyright (C) 2023 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.settings.accessibility; 18 19 import android.content.Context; 20 import android.content.pm.PackageManager; 21 22 import androidx.preference.Preference; 23 import androidx.preference.PreferenceCategory; 24 import androidx.preference.PreferenceScreen; 25 26 import com.android.settings.connecteddevice.DevicePreferenceCallback; 27 import com.android.settings.core.BasePreferenceController; 28 29 /** 30 * Abstract base class for bluetooth preference controller to handle UI logic, e.g. availability 31 * status, preference added, and preference removed. 32 */ 33 public abstract class BaseBluetoothDevicePreferenceController extends BasePreferenceController 34 implements DevicePreferenceCallback { 35 36 private PreferenceCategory mPreferenceCategory; 37 BaseBluetoothDevicePreferenceController(Context context, String preferenceKey)38 public BaseBluetoothDevicePreferenceController(Context context, 39 String preferenceKey) { 40 super(context, preferenceKey); 41 } 42 43 @Override getAvailabilityStatus()44 public int getAvailabilityStatus() { 45 return (mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)) 46 ? AVAILABLE 47 : CONDITIONALLY_UNAVAILABLE; 48 } 49 50 @Override displayPreference(PreferenceScreen screen)51 public void displayPreference(PreferenceScreen screen) { 52 super.displayPreference(screen); 53 54 mPreferenceCategory = screen.findPreference(getPreferenceKey()); 55 mPreferenceCategory.setVisible(false); 56 } 57 58 @Override onDeviceAdded(Preference preference)59 public void onDeviceAdded(Preference preference) { 60 if (mPreferenceCategory.getPreferenceCount() == 0) { 61 mPreferenceCategory.setVisible(true); 62 } 63 mPreferenceCategory.addPreference(preference); 64 } 65 66 @Override onDeviceRemoved(Preference preference)67 public void onDeviceRemoved(Preference preference) { 68 mPreferenceCategory.removePreference(preference); 69 if (mPreferenceCategory.getPreferenceCount() == 0) { 70 mPreferenceCategory.setVisible(false); 71 } 72 } 73 } 74