1 /* 2 * Copyright (C) 2011 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.bluetooth; 18 19 import android.bluetooth.BluetoothAdapter; 20 import android.bluetooth.BluetoothDevice; 21 import android.os.Bundle; 22 import android.preference.Preference; 23 import android.preference.PreferenceCategory; 24 import android.preference.PreferenceGroup; 25 import android.preference.PreferenceScreen; 26 import android.util.Log; 27 28 import com.android.settings.ProgressCategory; 29 import com.android.settings.SettingsPreferenceFragment; 30 31 import java.util.Collection; 32 import java.util.WeakHashMap; 33 34 /** 35 * Parent class for settings fragments that contain a list of Bluetooth 36 * devices. 37 * 38 * @see BluetoothSettings 39 * @see DevicePickerFragment 40 */ 41 public abstract class DeviceListPreferenceFragment extends 42 SettingsPreferenceFragment implements BluetoothCallback { 43 44 private static final String TAG = "DeviceListPreferenceFragment"; 45 46 private static final String KEY_BT_DEVICE_LIST = "bt_device_list"; 47 private static final String KEY_BT_SCAN = "bt_scan"; 48 49 private BluetoothDeviceFilter.Filter mFilter; 50 51 BluetoothDevice mSelectedDevice; 52 53 LocalBluetoothAdapter mLocalAdapter; 54 LocalBluetoothManager mLocalManager; 55 56 private PreferenceGroup mDeviceListGroup; 57 58 final WeakHashMap<CachedBluetoothDevice, BluetoothDevicePreference> mDevicePreferenceMap = 59 new WeakHashMap<CachedBluetoothDevice, BluetoothDevicePreference>(); 60 61 DeviceListPreferenceFragment() { 62 mFilter = BluetoothDeviceFilter.ALL_FILTER; 63 } 64 65 final void setFilter(BluetoothDeviceFilter.Filter filter) { 66 mFilter = filter; 67 } 68 69 final void setFilter(int filterType) { 70 mFilter = BluetoothDeviceFilter.getFilter(filterType); 71 } 72 73 @Override 74 public void onCreate(Bundle savedInstanceState) { 75 super.onCreate(savedInstanceState); 76 77 mLocalManager = LocalBluetoothManager.getInstance(getActivity()); 78 if (mLocalManager == null) { 79 Log.e(TAG, "Bluetooth is not supported on this device"); 80 return; 81 } 82 mLocalAdapter = mLocalManager.getBluetoothAdapter(); 83 84 addPreferencesForActivity(); 85 86 mDeviceListGroup = (PreferenceCategory) findPreference(KEY_BT_DEVICE_LIST); 87 } 88 89 void setDeviceListGroup(PreferenceGroup preferenceGroup) { 90 mDeviceListGroup = preferenceGroup; 91 } 92 93 /** Add preferences from the subclass. */ 94 abstract void addPreferencesForActivity(); 95 96 @Override 97 public void onResume() { 98 super.onResume(); 99 if (mLocalManager == null) return; 100 101 mLocalManager.setForegroundActivity(getActivity()); 102 mLocalManager.getEventManager().registerCallback(this); 103 104 updateProgressUi(mLocalAdapter.isDiscovering()); 105 } 106 107 @Override 108 public void onPause() { 109 super.onPause(); 110 if (mLocalManager == null) return; 111 112 removeAllDevices(); 113 mLocalManager.setForegroundActivity(null); 114 mLocalManager.getEventManager().unregisterCallback(this); 115 } 116 117 void removeAllDevices() { 118 mLocalAdapter.stopScanning(); 119 mDevicePreferenceMap.clear(); 120 mDeviceListGroup.removeAll(); 121 } 122 123 void addCachedDevices() { 124 Collection<CachedBluetoothDevice> cachedDevices = 125 mLocalManager.getCachedDeviceManager().getCachedDevicesCopy(); 126 for (CachedBluetoothDevice cachedDevice : cachedDevices) { 127 onDeviceAdded(cachedDevice); 128 } 129 } 130 131 @Override 132 public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, 133 Preference preference) { 134 if (KEY_BT_SCAN.equals(preference.getKey())) { 135 mLocalAdapter.startScanning(true); 136 return true; 137 } 138 139 if (preference instanceof BluetoothDevicePreference) { 140 BluetoothDevicePreference btPreference = (BluetoothDevicePreference) preference; 141 CachedBluetoothDevice device = btPreference.getCachedDevice(); 142 mSelectedDevice = device.getDevice(); 143 onDevicePreferenceClick(btPreference); 144 return true; 145 } 146 147 return super.onPreferenceTreeClick(preferenceScreen, preference); 148 } 149 150 void onDevicePreferenceClick(BluetoothDevicePreference btPreference) { 151 btPreference.onClicked(); 152 } 153 154 public void onDeviceAdded(CachedBluetoothDevice cachedDevice) { 155 if (mDevicePreferenceMap.get(cachedDevice) != null) { 156 return; 157 } 158 159 // Prevent updates while the list shows one of the state messages 160 if (mLocalAdapter.getBluetoothState() != BluetoothAdapter.STATE_ON) return; 161 162 if (mFilter.matches(cachedDevice.getDevice())) { 163 createDevicePreference(cachedDevice); 164 } 165 } 166 167 void createDevicePreference(CachedBluetoothDevice cachedDevice) { 168 BluetoothDevicePreference preference = new BluetoothDevicePreference( 169 getActivity(), cachedDevice); 170 171 initDevicePreference(preference); 172 mDeviceListGroup.addPreference(preference); 173 mDevicePreferenceMap.put(cachedDevice, preference); 174 } 175 176 /** 177 * Overridden in {@link BluetoothSettings} to add a listener. 178 * @param preference the newly added preference 179 */ 180 void initDevicePreference(BluetoothDevicePreference preference) { 181 // Does nothing by default 182 } 183 184 public void onDeviceDeleted(CachedBluetoothDevice cachedDevice) { 185 BluetoothDevicePreference preference = mDevicePreferenceMap.remove(cachedDevice); 186 if (preference != null) { 187 mDeviceListGroup.removePreference(preference); 188 } 189 } 190 191 public void onScanningStateChanged(boolean started) { 192 updateProgressUi(started); 193 } 194 195 private void updateProgressUi(boolean start) { 196 if (mDeviceListGroup instanceof ProgressCategory) { 197 ((ProgressCategory) mDeviceListGroup).setProgress(start); 198 } 199 } 200 201 public void onBluetoothStateChanged(int bluetoothState) { 202 if (bluetoothState == BluetoothAdapter.STATE_OFF) { 203 updateProgressUi(false); 204 } 205 } 206 } 207
