BluetoothAdapter.java revision cdd2864eb340fe46a97f4991f3949db1196bdde8
1/* 2 * Copyright (C) 2009 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 17package android.bluetooth; 18 19import android.annotation.SdkConstant; 20import android.annotation.SdkConstant.SdkConstantType; 21import android.os.Binder; 22import android.os.Handler; 23import android.os.IBinder; 24import android.os.Message; 25import android.os.ParcelUuid; 26import android.os.RemoteException; 27import android.os.ServiceManager; 28import android.util.Log; 29 30import java.io.IOException; 31import java.util.Collections; 32import java.util.HashSet; 33import java.util.LinkedList; 34import java.util.Random; 35import java.util.Set; 36import java.util.UUID; 37 38/** 39 * Represents the local Bluetooth adapter. 40 * 41 * <p>Use {@link #getDefaultAdapter} to get the default local Bluetooth 42 * adapter. 43 * 44 * <p>Use the {@link BluetoothDevice} class for operations on remote Bluetooth 45 * devices. 46 */ 47public final class BluetoothAdapter { 48 private static final String TAG = "BluetoothAdapter"; 49 private static final boolean DBG = false; 50 51 /** 52 * Sentinel error value for this class. Guaranteed to not equal any other 53 * integer constant in this class. Provided as a convenience for functions 54 * that require a sentinel error value, for example: 55 * <p><code>Intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, 56 * BluetoothAdapter.ERROR)</code> 57 */ 58 public static final int ERROR = Integer.MIN_VALUE; 59 60 /** 61 * Broadcast Action: The state of the local Bluetooth adapter has been 62 * changed. 63 * <p>For example, Bluetooth has been turned on or off. 64 * <p>Always contains the extra fields {@link #EXTRA_STATE} and {@link 65 * #EXTRA_PREVIOUS_STATE} containing the new and old states 66 * respectively. 67 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} to receive. 68 */ 69 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 70 public static final String ACTION_STATE_CHANGED = 71 "android.bluetooth.adapter.action.STATE_CHANGED"; 72 73 /** 74 * Used as an int extra field in {@link #ACTION_STATE_CHANGED} 75 * intents to request the current power state. Possible values are: 76 * {@link #STATE_OFF}, 77 * {@link #STATE_TURNING_ON}, 78 * {@link #STATE_ON}, 79 * {@link #STATE_TURNING_OFF}, 80 */ 81 public static final String EXTRA_STATE = 82 "android.bluetooth.adapter.extra.STATE"; 83 /** 84 * Used as an int extra field in {@link #ACTION_STATE_CHANGED} 85 * intents to request the previous power state. Possible values are: 86 * {@link #STATE_OFF}, 87 * {@link #STATE_TURNING_ON}, 88 * {@link #STATE_ON}, 89 * {@link #STATE_TURNING_OFF}, 90 */ 91 public static final String EXTRA_PREVIOUS_STATE = 92 "android.bluetooth.adapter.extra.PREVIOUS_STATE"; 93 94 /** 95 * Indicates the local Bluetooth adapter is off. 96 */ 97 public static final int STATE_OFF = 10; 98 /** 99 * Indicates the local Bluetooth adapter is turning on. However local 100 * clients should wait for {@link #STATE_ON} before attempting to 101 * use the adapter. 102 */ 103 public static final int STATE_TURNING_ON = 11; 104 /** 105 * Indicates the local Bluetooth adapter is on, and ready for use. 106 */ 107 public static final int STATE_ON = 12; 108 /** 109 * Indicates the local Bluetooth adapter is turning off. Local clients 110 * should immediately attempt graceful disconnection of any remote links. 111 */ 112 public static final int STATE_TURNING_OFF = 13; 113 114 /** 115 * Activity Action: Show a system activity that requests discoverable mode. 116 * <p>This activity will also request the user to turn on Bluetooth if it 117 * is not currently enabled. 118 * <p>Discoverable mode is equivalent to {@link 119 * #SCAN_MODE_CONNECTABLE_DISCOVERABLE}. It allows remote devices to see 120 * this Bluetooth adapter when they perform a discovery. 121 * <p>For privacy, Android is not by default discoverable. 122 * <p>The sender can optionally use extra field {@link 123 * #EXTRA_DISCOVERABLE_DURATION} to request the duration of 124 * discoverability. Currently the default duration is 120 seconds, and 125 * maximum duration is capped at 300 seconds for each request. 126 * <p>Notification of the result of this activity is posted using the 127 * {@link android.app.Activity#onActivityResult} callback. The 128 * <code>resultCode</code> 129 * will be the duration (in seconds) of discoverability or 130 * {@link android.app.Activity#RESULT_CANCELED} if the user rejected 131 * discoverability or an error has occurred. 132 * <p>Applications can also listen for {@link #ACTION_SCAN_MODE_CHANGED} 133 * for global notification whenever the scan mode changes. 134 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 135 */ 136 @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION) 137 public static final String ACTION_REQUEST_DISCOVERABLE = 138 "android.bluetooth.adapter.action.REQUEST_DISCOVERABLE"; 139 140 /** 141 * Used as an optional int extra field in {@link 142 * #ACTION_REQUEST_DISCOVERABLE} intents to request a specific duration 143 * for discoverability in seconds. The current default is 120 seconds, and 144 * requests over 300 seconds will be capped. These values could change. 145 */ 146 public static final String EXTRA_DISCOVERABLE_DURATION = 147 "android.bluetooth.adapter.extra.DISCOVERABLE_DURATION"; 148 149 /** 150 * Activity Action: Show a system activity that allows the user to turn on 151 * Bluetooth. 152 * <p>This system activity will return once Bluetooth has completed turning 153 * on, or the user has decided not to turn Bluetooth on. 154 * <p>Notification of the result of this activity is posted using the 155 * {@link android.app.Activity#onActivityResult} callback. The 156 * <code>resultCode</code> 157 * will be {@link android.app.Activity#RESULT_OK} if Bluetooth has been 158 * turned on or {@link android.app.Activity#RESULT_CANCELED} if the user 159 * has rejected the request or an error has occurred. 160 * <p>Applications can also listen for {@link #ACTION_STATE_CHANGED} 161 * for global notification whenever Bluetooth is turned on or off. 162 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 163 */ 164 @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION) 165 public static final String ACTION_REQUEST_ENABLE = 166 "android.bluetooth.adapter.action.REQUEST_ENABLE"; 167 168 /** 169 * Broadcast Action: Indicates the Bluetooth scan mode of the local Adapter 170 * has changed. 171 * <p>Always contains the extra fields {@link #EXTRA_SCAN_MODE} and {@link 172 * #EXTRA_PREVIOUS_SCAN_MODE} containing the new and old scan modes 173 * respectively. 174 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 175 */ 176 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 177 public static final String ACTION_SCAN_MODE_CHANGED = 178 "android.bluetooth.adapter.action.SCAN_MODE_CHANGED"; 179 180 /** 181 * Used as an int extra field in {@link #ACTION_SCAN_MODE_CHANGED} 182 * intents to request the current scan mode. Possible values are: 183 * {@link #SCAN_MODE_NONE}, 184 * {@link #SCAN_MODE_CONNECTABLE}, 185 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}, 186 */ 187 public static final String EXTRA_SCAN_MODE = "android.bluetooth.adapter.extra.SCAN_MODE"; 188 /** 189 * Used as an int extra field in {@link #ACTION_SCAN_MODE_CHANGED} 190 * intents to request the previous scan mode. Possible values are: 191 * {@link #SCAN_MODE_NONE}, 192 * {@link #SCAN_MODE_CONNECTABLE}, 193 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}, 194 */ 195 public static final String EXTRA_PREVIOUS_SCAN_MODE = 196 "android.bluetooth.adapter.extra.PREVIOUS_SCAN_MODE"; 197 198 /** 199 * Indicates that both inquiry scan and page scan are disabled on the local 200 * Bluetooth adapter. Therefore this device is neither discoverable 201 * nor connectable from remote Bluetooth devices. 202 */ 203 public static final int SCAN_MODE_NONE = 20; 204 /** 205 * Indicates that inquiry scan is disabled, but page scan is enabled on the 206 * local Bluetooth adapter. Therefore this device is not discoverable from 207 * remote Bluetooth devices, but is connectable from remote devices that 208 * have previously discovered this device. 209 */ 210 public static final int SCAN_MODE_CONNECTABLE = 21; 211 /** 212 * Indicates that both inquiry scan and page scan are enabled on the local 213 * Bluetooth adapter. Therefore this device is both discoverable and 214 * connectable from remote Bluetooth devices. 215 */ 216 public static final int SCAN_MODE_CONNECTABLE_DISCOVERABLE = 23; 217 218 219 /** 220 * Broadcast Action: The local Bluetooth adapter has started the remote 221 * device discovery process. 222 * <p>This usually involves an inquiry scan of about 12 seconds, followed 223 * by a page scan of each new device to retrieve its Bluetooth name. 224 * <p>Register for {@link BluetoothDevice#ACTION_FOUND} to be notified as 225 * remote Bluetooth devices are found. 226 * <p>Device discovery is a heavyweight procedure. New connections to 227 * remote Bluetooth devices should not be attempted while discovery is in 228 * progress, and existing connections will experience limited bandwidth 229 * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing 230 * discovery. 231 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} to receive. 232 */ 233 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 234 public static final String ACTION_DISCOVERY_STARTED = 235 "android.bluetooth.adapter.action.DISCOVERY_STARTED"; 236 /** 237 * Broadcast Action: The local Bluetooth adapter has finished the device 238 * discovery process. 239 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} to receive. 240 */ 241 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 242 public static final String ACTION_DISCOVERY_FINISHED = 243 "android.bluetooth.adapter.action.DISCOVERY_FINISHED"; 244 245 /** 246 * Broadcast Action: The local Bluetooth adapter has changed its friendly 247 * Bluetooth name. 248 * <p>This name is visible to remote Bluetooth devices. 249 * <p>Always contains the extra field {@link #EXTRA_LOCAL_NAME} containing 250 * the name. 251 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} to receive. 252 */ 253 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 254 public static final String ACTION_LOCAL_NAME_CHANGED = 255 "android.bluetooth.adapter.action.LOCAL_NAME_CHANGED"; 256 /** 257 * Used as a String extra field in {@link #ACTION_LOCAL_NAME_CHANGED} 258 * intents to request the local Bluetooth name. 259 */ 260 public static final String EXTRA_LOCAL_NAME = "android.bluetooth.adapter.extra.LOCAL_NAME"; 261 262 /** @hide */ 263 public static final String BLUETOOTH_SERVICE = "bluetooth"; 264 265 private static final int ADDRESS_LENGTH = 17; 266 267 /** 268 * Lazyily initialized singleton. Guaranteed final after first object 269 * constructed. 270 */ 271 private static BluetoothAdapter sAdapter; 272 273 private final IBluetooth mService; 274 275 /** 276 * Get a handle to the default local Bluetooth adapter. 277 * <p>Currently Android only supports one Bluetooth adapter, but the API 278 * could be extended to support more. This will always return the default 279 * adapter. 280 * @return the default local adapter, or null if Bluetooth is not supported 281 * on this hardware platform 282 */ 283 public static synchronized BluetoothAdapter getDefaultAdapter() { 284 if (sAdapter == null) { 285 IBinder b = ServiceManager.getService(BluetoothAdapter.BLUETOOTH_SERVICE); 286 if (b != null) { 287 IBluetooth service = IBluetooth.Stub.asInterface(b); 288 sAdapter = new BluetoothAdapter(service); 289 } 290 } 291 return sAdapter; 292 } 293 294 /** 295 * Use {@link #getDefaultAdapter} to get the BluetoothAdapter instance. 296 * @hide 297 */ 298 public BluetoothAdapter(IBluetooth service) { 299 if (service == null) { 300 throw new IllegalArgumentException("service is null"); 301 } 302 mService = service; 303 } 304 305 /** 306 * Get a {@link BluetoothDevice} object for the given Bluetooth hardware 307 * address. 308 * <p>Valid Bluetooth hardware addresses must be upper case, in a format 309 * such as "00:11:22:33:AA:BB". The helper {@link #checkBluetoothAddress} is 310 * available to validate a Bluetooth address. 311 * <p>A {@link BluetoothDevice} will always be returned for a valid 312 * hardware address, even if this adapter has never seen that device. 313 * 314 * @param address valid Bluetooth MAC address 315 * @throws IllegalArgumentException if address is invalid 316 */ 317 public BluetoothDevice getRemoteDevice(String address) { 318 return new BluetoothDevice(address); 319 } 320 321 /** 322 * Return true if Bluetooth is currently enabled and ready for use. 323 * <p>Equivalent to: 324 * <code>getBluetoothState() == STATE_ON</code> 325 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 326 * 327 * @return true if the local adapter is turned on 328 */ 329 public boolean isEnabled() { 330 try { 331 return mService.isEnabled(); 332 } catch (RemoteException e) {Log.e(TAG, "", e);} 333 return false; 334 } 335 336 /** 337 * Get the current state of the local Bluetooth adapter. 338 * <p>Possible return values are 339 * {@link #STATE_OFF}, 340 * {@link #STATE_TURNING_ON}, 341 * {@link #STATE_ON}, 342 * {@link #STATE_TURNING_OFF}. 343 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 344 * 345 * @return current state of Bluetooth adapter 346 */ 347 public int getState() { 348 try { 349 return mService.getBluetoothState(); 350 } catch (RemoteException e) {Log.e(TAG, "", e);} 351 return STATE_OFF; 352 } 353 354 /** 355 * Turn on the local Bluetooth adapter. 356 * <p>This powers on the underlying Bluetooth hardware, and starts all 357 * Bluetooth system services. 358 * <p>This is an asynchronous call: it will return immediately, and 359 * clients should listen for {@link #ACTION_STATE_CHANGED} 360 * to be notified of subsequent adapter state changes. If this call returns 361 * true, then the adapter state will immediately transition from {@link 362 * #STATE_OFF} to {@link #STATE_TURNING_ON}, and some time 363 * later transition to either {@link #STATE_OFF} or {@link 364 * #STATE_ON}. If this call returns false then there was an 365 * immediate problem that will prevent the adapter from being turned on - 366 * such as Airplane mode, or the adapter is already turned on. 367 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} 368 * 369 * @return true to indicate adapter startup has begun, or false on 370 * immediate error 371 */ 372 public boolean enable() { 373 try { 374 return mService.enable(); 375 } catch (RemoteException e) {Log.e(TAG, "", e);} 376 return false; 377 } 378 379 /** 380 * Turn off the local Bluetooth adapter. 381 * <p>This gracefully shuts down all Bluetooth connections, stops Bluetooth 382 * system services, and powers down the underlying Bluetooth hardware. 383 * <p>This is an asynchronous call: it will return immediately, and 384 * clients should listen for {@link #ACTION_STATE_CHANGED} 385 * to be notified of subsequent adapter state changes. If this call returns 386 * true, then the adapter state will immediately transition from {@link 387 * #STATE_ON} to {@link #STATE_TURNING_OFF}, and some time 388 * later transition to either {@link #STATE_OFF} or {@link 389 * #STATE_ON}. If this call returns false then there was an 390 * immediate problem that will prevent the adapter from being turned off - 391 * such as the adapter already being turned off. 392 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} 393 * 394 * @return true to indicate adapter shutdown has begun, or false on 395 * immediate error 396 */ 397 public boolean disable() { 398 try { 399 return mService.disable(true); 400 } catch (RemoteException e) {Log.e(TAG, "", e);} 401 return false; 402 } 403 404 /** 405 * Returns the hardware address of the local Bluetooth adapter. 406 * <p>For example, "00:11:22:AA:BB:CC". 407 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 408 * 409 * @return Bluetooth hardware address as string 410 */ 411 public String getAddress() { 412 try { 413 return mService.getAddress(); 414 } catch (RemoteException e) {Log.e(TAG, "", e);} 415 return null; 416 } 417 418 /** 419 * Get the friendly Bluetooth name of the local Bluetooth adapter. 420 * <p>This name is visible to remote Bluetooth devices. 421 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 422 * 423 * @return the Bluetooth name, or null on error 424 */ 425 public String getName() { 426 try { 427 return mService.getName(); 428 } catch (RemoteException e) {Log.e(TAG, "", e);} 429 return null; 430 } 431 432 /** 433 * Set the friendly Bluetooth name of the local Bluetoth adapter. 434 * <p>This name is visible to remote Bluetooth devices. 435 * <p>Valid Bluetooth names are a maximum of 248 UTF-8 characters, however 436 * many remote devices can only display the first 40 characters, and some 437 * may be limited to just 20. 438 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} 439 * 440 * @param name a valid Bluetooth name 441 * @return true if the name was set, false otherwise 442 */ 443 public boolean setName(String name) { 444 try { 445 return mService.setName(name); 446 } catch (RemoteException e) {Log.e(TAG, "", e);} 447 return false; 448 } 449 450 /** 451 * Get the current Bluetooth scan mode of the local Bluetooth adaper. 452 * <p>The Bluetooth scan mode determines if the local adapter is 453 * connectable and/or discoverable from remote Bluetooth devices. 454 * <p>Possible values are: 455 * {@link #SCAN_MODE_NONE}, 456 * {@link #SCAN_MODE_CONNECTABLE}, 457 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}. 458 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 459 * 460 * @return scan mode 461 */ 462 public int getScanMode() { 463 try { 464 return mService.getScanMode(); 465 } catch (RemoteException e) {Log.e(TAG, "", e);} 466 return SCAN_MODE_NONE; 467 } 468 469 /** 470 * Set the Bluetooth scan mode of the local Bluetooth adapter. 471 * <p>The Bluetooth scan mode determines if the local adapter is 472 * connectable and/or discoverable from remote Bluetooth devices. 473 * <p>For privacy reasons, discoverable mode is automatically turned off 474 * after <code>duration</code> seconds. For example, 120 seconds should be 475 * enough for a remote device to initiate and complete its discovery 476 * process. 477 * <p>Valid scan mode values are: 478 * {@link #SCAN_MODE_NONE}, 479 * {@link #SCAN_MODE_CONNECTABLE}, 480 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}. 481 * <p>Requires {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} 482 * <p>Applications cannot set the scan mode. They should use 483 * <code>startActivityForResult( 484 * BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE}) 485 * </code>instead. 486 * 487 * @param mode valid scan mode 488 * @param duration time in seconds to apply scan mode, only used for 489 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE} 490 * @return true if the scan mode was set, false otherwise 491 * @hide 492 */ 493 public boolean setScanMode(int mode, int duration) { 494 try { 495 return mService.setScanMode(mode, duration); 496 } catch (RemoteException e) {Log.e(TAG, "", e);} 497 return false; 498 } 499 500 /** @hide */ 501 public boolean setScanMode(int mode) { 502 return setScanMode(mode, 120); 503 } 504 505 /** @hide */ 506 public int getDiscoverableTimeout() { 507 try { 508 return mService.getDiscoverableTimeout(); 509 } catch (RemoteException e) {Log.e(TAG, "", e);} 510 return -1; 511 } 512 513 /** @hide */ 514 public void setDiscoverableTimeout(int timeout) { 515 try { 516 mService.setDiscoverableTimeout(timeout); 517 } catch (RemoteException e) {Log.e(TAG, "", e);} 518 } 519 520 /** 521 * Start the remote device discovery process. 522 * <p>The discovery process usually involves an inquiry scan of about 12 523 * seconds, followed by a page scan of each new device to retrieve its 524 * Bluetooth name. 525 * <p>This is an asynchronous call, it will return immediately. Register 526 * for {@link #ACTION_DISCOVERY_STARTED} and {@link 527 * #ACTION_DISCOVERY_FINISHED} intents to determine exactly when the 528 * discovery starts and completes. Register for {@link 529 * BluetoothDevice#ACTION_FOUND} to be notified as remote Bluetooth devices 530 * are found. 531 * <p>Device discovery is a heavyweight procedure. New connections to 532 * remote Bluetooth devices should not be attempted while discovery is in 533 * progress, and existing connections will experience limited bandwidth 534 * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing 535 * discovery. 536 * <p>Device discovery will only find remote devices that are currently 537 * <i>discoverable</i> (inquiry scan enabled). Many Bluetooth devices are 538 * not discoverable by default, and need to be entered into a special mode. 539 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}. 540 * 541 * @return true on success, false on error 542 */ 543 public boolean startDiscovery() { 544 try { 545 return mService.startDiscovery(); 546 } catch (RemoteException e) {Log.e(TAG, "", e);} 547 return false; 548 } 549 550 /** 551 * Cancel the current device discovery process. 552 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}. 553 * 554 * @return true on success, false on error 555 */ 556 public boolean cancelDiscovery() { 557 try { 558 mService.cancelDiscovery(); 559 } catch (RemoteException e) {Log.e(TAG, "", e);} 560 return false; 561 } 562 563 /** 564 * Return true if the local Bluetooth adapter is currently in the device 565 * discovery process. 566 * <p>Device discovery is a heavyweight procedure. New connections to 567 * remote Bluetooth devices should not be attempted while discovery is in 568 * progress, and existing connections will experience limited bandwidth 569 * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing 570 * discovery. 571 * <p>Applications can also register for {@link #ACTION_DISCOVERY_STARTED} 572 * or {@link #ACTION_DISCOVERY_FINISHED} to be notified when discovery 573 * starts or completes. 574 * <p>Requires {@link android.Manifest.permission#BLUETOOTH}. 575 * 576 * @return true if discovering 577 */ 578 public boolean isDiscovering() { 579 try { 580 return mService.isDiscovering(); 581 } catch (RemoteException e) {Log.e(TAG, "", e);} 582 return false; 583 } 584 585 /** 586 * Return the set of {@link BluetoothDevice} objects that are bonded 587 * (paired) to the local adapter. 588 * <p>Requires {@link android.Manifest.permission#BLUETOOTH}. 589 * 590 * @return unmodifiable set of {@link BluetoothDevice}, or null on error 591 */ 592 public Set<BluetoothDevice> getBondedDevices() { 593 try { 594 return toDeviceSet(mService.listBonds()); 595 } catch (RemoteException e) {Log.e(TAG, "", e);} 596 return null; 597 } 598 599 /** 600 * Picks RFCOMM channels until none are left. 601 * Avoids reserved channels. 602 */ 603 private static class RfcommChannelPicker { 604 private static final int[] RESERVED_RFCOMM_CHANNELS = new int[] { 605 10, // HFAG 606 11, // HSAG 607 12, // OPUSH 608 19, // PBAP 609 }; 610 private static LinkedList<Integer> sChannels; // master list of non-reserved channels 611 private static Random sRandom; 612 613 private final LinkedList<Integer> mChannels; // local list of channels left to try 614 615 private final UUID mUuid; 616 617 public RfcommChannelPicker(UUID uuid) { 618 synchronized (RfcommChannelPicker.class) { 619 if (sChannels == null) { 620 // lazy initialization of non-reserved rfcomm channels 621 sChannels = new LinkedList<Integer>(); 622 for (int i = 1; i <= BluetoothSocket.MAX_RFCOMM_CHANNEL; i++) { 623 sChannels.addLast(new Integer(i)); 624 } 625 for (int reserved : RESERVED_RFCOMM_CHANNELS) { 626 sChannels.remove(new Integer(reserved)); 627 } 628 sRandom = new Random(); 629 } 630 mChannels = (LinkedList<Integer>)sChannels.clone(); 631 } 632 mUuid = uuid; 633 } 634 /* Returns next random channel, or -1 if we're out */ 635 public int nextChannel() { 636 if (mChannels.size() == 0) { 637 return -1; 638 } 639 return mChannels.remove(sRandom.nextInt(mChannels.size())); 640 } 641 } 642 643 /** 644 * Create a listening, secure RFCOMM Bluetooth socket. 645 * <p>A remote device connecting to this socket will be authenticated and 646 * communication on this socket will be encrypted. 647 * <p>Use {@link BluetoothServerSocket#accept} to retrieve incoming 648 * connections from a listening {@link BluetoothServerSocket}. 649 * <p>Valid RFCOMM channels are in range 1 to 30. 650 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} 651 * @param channel RFCOMM channel to listen on 652 * @return a listening RFCOMM BluetoothServerSocket 653 * @throws IOException on error, for example Bluetooth not available, or 654 * insufficient permissions, or channel in use. 655 * @hide 656 */ 657 public BluetoothServerSocket listenUsingRfcommOn(int channel) throws IOException { 658 BluetoothServerSocket socket = new BluetoothServerSocket( 659 BluetoothSocket.TYPE_RFCOMM, true, true, channel); 660 int errno = socket.mSocket.bindListen(); 661 if (errno != 0) { 662 try { 663 socket.close(); 664 } catch (IOException e) {} 665 socket.mSocket.throwErrnoNative(errno); 666 } 667 return socket; 668 } 669 670 /** 671 * Create a listening, secure RFCOMM Bluetooth socket with Service Record. 672 * <p>A remote device connecting to this socket will be authenticated and 673 * communication on this socket will be encrypted. 674 * <p>Use {@link BluetoothServerSocket#accept} to retrieve incoming 675 * connections from a listening {@link BluetoothServerSocket}. 676 * <p>The system will assign an unused RFCOMM channel to listen on. 677 * <p>The system will also register a Service Discovery 678 * Protocol (SDP) record with the local SDP server containing the specified 679 * UUID, service name, and auto-assigned channel. Remote Bluetooth devices 680 * can use the same UUID to query our SDP server and discover which channel 681 * to connect to. This SDP record will be removed when this socket is 682 * closed, or if this application closes unexpectedly. 683 * <p>Use {@link BluetoothDevice#createRfcommSocketToServiceRecord} to 684 * connect to this socket from another device using the same {@link UUID}. 685 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 686 * @param name service name for SDP record 687 * @param uuid uuid for SDP record 688 * @return a listening RFCOMM BluetoothServerSocket 689 * @throws IOException on error, for example Bluetooth not available, or 690 * insufficient permissions, or channel in use. 691 */ 692 public BluetoothServerSocket listenUsingRfcommWithServiceRecord(String name, UUID uuid) 693 throws IOException { 694 RfcommChannelPicker picker = new RfcommChannelPicker(uuid); 695 696 BluetoothServerSocket socket; 697 int channel; 698 int errno; 699 while (true) { 700 channel = picker.nextChannel(); 701 702 if (channel == -1) { 703 throw new IOException("No available channels"); 704 } 705 706 socket = new BluetoothServerSocket( 707 BluetoothSocket.TYPE_RFCOMM, true, true, channel); 708 errno = socket.mSocket.bindListen(); 709 if (errno == 0) { 710 if (DBG) Log.d(TAG, "listening on RFCOMM channel " + channel); 711 break; // success 712 } else if (errno == BluetoothSocket.EADDRINUSE) { 713 if (DBG) Log.d(TAG, "RFCOMM channel " + channel + " in use"); 714 try { 715 socket.close(); 716 } catch (IOException e) {} 717 continue; // try another channel 718 } else { 719 try { 720 socket.close(); 721 } catch (IOException e) {} 722 socket.mSocket.throwErrnoNative(errno); // Exception as a result of bindListen() 723 } 724 } 725 726 int handle = -1; 727 try { 728 handle = mService.addRfcommServiceRecord(name, new ParcelUuid(uuid), channel, 729 new Binder()); 730 } catch (RemoteException e) {Log.e(TAG, "", e);} 731 if (handle == -1) { 732 try { 733 socket.close(); 734 } catch (IOException e) {} 735 throw new IOException("Not able to register SDP record for " + name); 736 } 737 socket.setCloseHandler(mHandler, handle); 738 return socket; 739 } 740 741 /** 742 * Construct an unencrypted, unauthenticated, RFCOMM server socket. 743 * Call #accept to retrieve connections to this socket. 744 * @return An RFCOMM BluetoothServerSocket 745 * @throws IOException On error, for example Bluetooth not available, or 746 * insufficient permissions. 747 * @hide 748 */ 749 public BluetoothServerSocket listenUsingInsecureRfcommOn(int port) throws IOException { 750 BluetoothServerSocket socket = new BluetoothServerSocket( 751 BluetoothSocket.TYPE_RFCOMM, false, false, port); 752 int errno = socket.mSocket.bindListen(); 753 if (errno != 0) { 754 try { 755 socket.close(); 756 } catch (IOException e) {} 757 socket.mSocket.throwErrnoNative(errno); 758 } 759 return socket; 760 } 761 762 /** 763 * Construct a SCO server socket. 764 * Call #accept to retrieve connections to this socket. 765 * @return A SCO BluetoothServerSocket 766 * @throws IOException On error, for example Bluetooth not available, or 767 * insufficient permissions. 768 * @hide 769 */ 770 public static BluetoothServerSocket listenUsingScoOn() throws IOException { 771 BluetoothServerSocket socket = new BluetoothServerSocket( 772 BluetoothSocket.TYPE_SCO, false, false, -1); 773 int errno = socket.mSocket.bindListen(); 774 if (errno != 0) { 775 try { 776 socket.close(); 777 } catch (IOException e) {} 778 socket.mSocket.throwErrnoNative(errno); 779 } 780 return socket; 781 } 782 783 private Set<BluetoothDevice> toDeviceSet(String[] addresses) { 784 Set<BluetoothDevice> devices = new HashSet<BluetoothDevice>(addresses.length); 785 for (int i = 0; i < addresses.length; i++) { 786 devices.add(getRemoteDevice(addresses[i])); 787 } 788 return Collections.unmodifiableSet(devices); 789 } 790 791 private Handler mHandler = new Handler() { 792 public void handleMessage(Message msg) { 793 /* handle socket closing */ 794 int handle = msg.what; 795 try { 796 if (DBG) Log.d(TAG, "Removing service record " + Integer.toHexString(handle)); 797 mService.removeServiceRecord(handle); 798 } catch (RemoteException e) {Log.e(TAG, "", e);} 799 } 800 }; 801 802 /** 803 * Validate a Bluetooth address, such as "00:43:A8:23:10:F0" 804 * <p>Alphabetic characters must be uppercase to be valid. 805 * 806 * @param address Bluetooth address as string 807 * @return true if the address is valid, false otherwise 808 */ 809 public static boolean checkBluetoothAddress(String address) { 810 if (address == null || address.length() != ADDRESS_LENGTH) { 811 return false; 812 } 813 for (int i = 0; i < ADDRESS_LENGTH; i++) { 814 char c = address.charAt(i); 815 switch (i % 3) { 816 case 0: 817 case 1: 818 if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'F')) { 819 // hex character, OK 820 break; 821 } 822 return false; 823 case 2: 824 if (c == ':') { 825 break; // OK 826 } 827 return false; 828 } 829 } 830 return true; 831 } 832} 833