BluetoothAdapter.java revision 24bb9b8af4ff691538fe9e517e8156016b0da6cd
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.Message; 24import android.os.ParcelUuid; 25import android.os.RemoteException; 26import android.util.Log; 27 28import java.io.IOException; 29import java.util.Collections; 30import java.util.HashSet; 31import java.util.LinkedList; 32import java.util.Random; 33import java.util.Set; 34 35/** 36 * Represents the local Bluetooth adapter. 37 * 38 * <p>Use {@link android.content.Context#getSystemService} with {@link 39 * android.content.Context#BLUETOOTH_SERVICE} to get the default local 40 * Bluetooth adapter. On most Android devices there is only one local 41 * Bluetotoh adapter. 42 * 43 * <p>Use the {@link BluetoothDevice} class for operations on remote Bluetooth 44 * devices. 45 */ 46public final class BluetoothAdapter { 47 private static final String TAG = "BluetoothAdapter"; 48 private static final boolean DBG = true; //STOPSHIP: Remove excess logging 49 50 /** 51 * Sentinel error value for this class. Guaranteed to not equal any other 52 * integer constant in this class. Provided as a convenience for functions 53 * that require a sentinel error value, for example: 54 * <p><code>Intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, 55 * BluetoothAdapter.ERROR)</code> 56 */ 57 public static final int ERROR = Integer.MIN_VALUE; 58 59 /** 60 * Broadcast Action: The state of the local Bluetooth adapter has been 61 * changed. 62 * <p>For example, Bluetooth has been turned on or off. 63 * <p>Always contains the extra fields {@link #EXTRA_STATE} and {@link 64 * #EXTRA_PREVIOUS_STATE} containing the new and old states 65 * respectively. 66 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} to receive. 67 */ 68 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 69 public static final String ACTION_STATE_CHANGED = 70 "android.bluetooth.adapter.action.STATE_CHANGED"; 71 72 /** 73 * Used as an int extra field in {@link #ACTION_STATE_CHANGED} 74 * intents to request the current power state. Possible values are: 75 * {@link #STATE_OFF}, 76 * {@link #STATE_TURNING_ON}, 77 * {@link #STATE_ON}, 78 * {@link #STATE_TURNING_OFF}, 79 */ 80 public static final String EXTRA_STATE = 81 "android.bluetooth.adapter.extra.STATE"; 82 /** 83 * Used as an int extra field in {@link #ACTION_STATE_CHANGED} 84 * intents to request the previous power state. Possible values are: 85 * {@link #STATE_OFF}, 86 * {@link #STATE_TURNING_ON}, 87 * {@link #STATE_ON}, 88 * {@link #STATE_TURNING_OFF}, 89 */ 90 public static final String EXTRA_PREVIOUS_STATE = 91 "android.bluetooth.adapter.extra.PREVIOUS_STATE"; 92 93 /** 94 * Indicates the local Bluetooth adapter is off. 95 */ 96 public static final int STATE_OFF = 10; 97 /** 98 * Indicates the local Bluetooth adapter is turning on. However local 99 * clients should wait for {@link #STATE_ON} before attempting to 100 * use the adapter. 101 */ 102 public static final int STATE_TURNING_ON = 11; 103 /** 104 * Indicates the local Bluetooth adapter is on, and ready for use. 105 */ 106 public static final int STATE_ON = 12; 107 /** 108 * Indicates the local Bluetooth adapter is turning off. Local clients 109 * should immediately attempt graceful disconnection of any remote links. 110 */ 111 public static final int STATE_TURNING_OFF = 13; 112 113 /** 114 * Activity Action: Show a system activity that requests discoverable mode. 115 * <p>This activity will also request the user to turn on Bluetooth if it 116 * is not currently enabled. 117 * <p>Discoverable mode is equivalent to {@link 118 * #SCAN_MODE_CONNECTABLE_DISCOVERABLE}. It allows remote devices to see 119 * this Bluetooth adapter when they perform a discovery. 120 * <p>For privacy, Android is not by default discoverable. 121 * <p>The sender can optionally use extra field {@link 122 * #EXTRA_DISCOVERABLE_DURATION} to request the duration of 123 * discoverability. Currently the default duration is 120 seconds, and 124 * maximum duration is capped at 300 seconds for each request. 125 * <p>Notification of the result of this activity is posted using the 126 * {@link android.app.Activity#onActivityResult} callback. The 127 * <code>resultCode</code> 128 * will be the duration (in seconds) of discoverability, or a negative 129 * value if the user rejected discoverability. 130 * <p>Applications can also listen for {@link #ACTION_SCAN_MODE_CHANGED} 131 * for global notification whenever the scan mode changes. 132 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 133 */ 134 @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION) 135 public static final String ACTION_REQUEST_DISCOVERABLE = 136 "android.bluetooth.adapter.action.REQUEST_DISCOVERABLE"; 137 138 /** 139 * Used as an optional int extra field in {@link 140 * #ACTION_REQUEST_DISCOVERABLE} intents to request a specific duration 141 * for discoverability in seconds. The current default is 120 seconds, and 142 * requests over 300 seconds will be capped. These values could change. 143 */ 144 public static final String EXTRA_DISCOVERABLE_DURATION = 145 "android.bluetooth.adapter.extra.DISCOVERABLE_DURATION"; 146 147 /** 148 * Activity Action: Show a system activity that allows the user to turn on 149 * Bluetooth. 150 * <p>This system activity will return once Bluetooth has completed turning 151 * on, or the user has decided not to turn Bluetooth on. 152 * <p>Notification of the result of this activity is posted using the 153 * {@link android.app.Activity#onActivityResult} callback. The 154 * <code>resultCode</code> 155 * will be negative if the user did not turn on Bluetooth, and non-negative 156 * if Bluetooth has been turned on. 157 * <p>Applications can also listen for {@link #ACTION_STATE_CHANGED} 158 * for global notification whenever Bluetooth is turned on or off. 159 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 160 */ 161 @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION) 162 public static final String ACTION_REQUEST_ENABLE = 163 "android.bluetooth.adapter.action.REQUEST_ENABLE"; 164 165 /** 166 * Broadcast Action: Indicates the Bluetooth scan mode of the local Adapter 167 * has changed. 168 * <p>Always contains the extra fields {@link #EXTRA_SCAN_MODE} and {@link 169 * #EXTRA_PREVIOUS_SCAN_MODE} containing the new and old scan modes 170 * respectively. 171 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 172 */ 173 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 174 public static final String ACTION_SCAN_MODE_CHANGED = 175 "android.bluetooth.adapter.action.SCAN_MODE_CHANGED"; 176 177 /** 178 * Used as an int extra field in {@link #ACTION_SCAN_MODE_CHANGED} 179 * intents to request the current scan mode. Possible values are: 180 * {@link #SCAN_MODE_NONE}, 181 * {@link #SCAN_MODE_CONNECTABLE}, 182 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}, 183 */ 184 public static final String EXTRA_SCAN_MODE = "android.bluetooth.adapter.extra.SCAN_MODE"; 185 /** 186 * Used as an int extra field in {@link #ACTION_SCAN_MODE_CHANGED} 187 * intents to request the previous scan mode. Possible values are: 188 * {@link #SCAN_MODE_NONE}, 189 * {@link #SCAN_MODE_CONNECTABLE}, 190 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}, 191 */ 192 public static final String EXTRA_PREVIOUS_SCAN_MODE = 193 "android.bluetooth.adapter.extra.PREVIOUS_SCAN_MODE"; 194 195 /** 196 * Indicates that both inquiry scan and page scan are disabled on the local 197 * Bluetooth adapter. Therefore this device is neither discoverable 198 * nor connectable from remote Bluetooth devices. 199 */ 200 public static final int SCAN_MODE_NONE = 20; 201 /** 202 * Indicates that inquiry scan is disabled, but page scan is enabled on the 203 * local Bluetooth adapter. Therefore this device is not discoverable from 204 * remote Bluetooth devices, but is connectable from remote devices that 205 * have previously discovered this device. 206 */ 207 public static final int SCAN_MODE_CONNECTABLE = 21; 208 /** 209 * Indicates that both inquiry scan and page scan are enabled on the local 210 * Bluetooth adapter. Therefore this device is both discoverable and 211 * connectable from remote Bluetooth devices. 212 */ 213 public static final int SCAN_MODE_CONNECTABLE_DISCOVERABLE = 23; 214 215 216 /** 217 * Broadcast Action: The local Bluetooth adapter has started the remote 218 * device discovery process. 219 * <p>This usually involves an inquiry scan of about 12 seconds, followed 220 * by a page scan of each new device to retrieve its Bluetooth name. 221 * <p>Register for {@link BluetoothDevice#ACTION_FOUND} to be notified as 222 * remote Bluetooth devices are found. 223 * <p>Device discovery is a heavyweight procedure. New connections to 224 * remote Bluetooth devices should not be attempted while discovery is in 225 * progress, and existing connections will experience limited bandwidth 226 * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing 227 * discovery. 228 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} to receive. 229 */ 230 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 231 public static final String ACTION_DISCOVERY_STARTED = 232 "android.bluetooth.adapter.action.DISCOVERY_STARTED"; 233 /** 234 * Broadcast Action: The local Bluetooth adapter has finished the device 235 * discovery process. 236 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} to receive. 237 */ 238 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 239 public static final String ACTION_DISCOVERY_FINISHED = 240 "android.bluetooth.adapter.action.DISCOVERY_FINISHED"; 241 242 /** 243 * Broadcast Action: The local Bluetooth adapter has changed its friendly 244 * Bluetooth name. 245 * <p>This name is visible to remote Bluetooth devices. 246 * <p>Always contains the extra field {@link #EXTRA_LOCAL_NAME} containing 247 * the name. 248 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} to receive. 249 */ 250 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 251 public static final String ACTION_LOCAL_NAME_CHANGED = 252 "android.bluetooth.adapter.action.LOCAL_NAME_CHANGED"; 253 /** 254 * Used as a String extra field in {@link #ACTION_LOCAL_NAME_CHANGED} 255 * intents to request the local Bluetooth name. 256 */ 257 public static final String EXTRA_LOCAL_NAME = "android.bluetooth.adapter.extra.LOCAL_NAME"; 258 259 private static final int ADDRESS_LENGTH = 17; 260 261 private final IBluetooth mService; 262 263 /** 264 * Do not use this constructor. Use Context.getSystemService() instead. 265 * @hide 266 */ 267 public BluetoothAdapter(IBluetooth service) { 268 if (service == null) { 269 throw new IllegalArgumentException("service is null"); 270 } 271 mService = service; 272 } 273 274 /** 275 * Get a {@link BluetoothDevice} object for the given Bluetooth hardware 276 * address. 277 * <p>Valid Bluetooth hardware addresses must be upper case, in a format 278 * such as "00:11:22:33:AA:BB". The helper {@link #checkBluetoothAddress} is 279 * available to validate a Bluetooth address. 280 * <p>A {@link BluetoothDevice} will always be returned for a valid 281 * hardware address, even if this adapter has never seen that device. 282 * 283 * @param address valid Bluetooth MAC address 284 * @throws IllegalArgumentException if address is invalid 285 */ 286 public BluetoothDevice getRemoteDevice(String address) { 287 return new BluetoothDevice(address); 288 } 289 290 /** 291 * Return true if Bluetooth is currently enabled and ready for use. 292 * <p>Equivalent to: 293 * <code>getBluetoothState() == STATE_ON</code> 294 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 295 * 296 * @return true if the local adapter is turned on 297 */ 298 public boolean isEnabled() { 299 try { 300 return mService.isEnabled(); 301 } catch (RemoteException e) {Log.e(TAG, "", e);} 302 return false; 303 } 304 305 /** 306 * Get the current state of the local Bluetooth adapter. 307 * <p>Possible return values are 308 * {@link #STATE_OFF}, 309 * {@link #STATE_TURNING_ON}, 310 * {@link #STATE_ON}, 311 * {@link #STATE_TURNING_OFF}. 312 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 313 * 314 * @return current state of Bluetooth adapter 315 */ 316 public int getState() { 317 try { 318 return mService.getBluetoothState(); 319 } catch (RemoteException e) {Log.e(TAG, "", e);} 320 return STATE_OFF; 321 } 322 323 /** 324 * Turn on the local Bluetooth adapter. 325 * <p>This powers on the underlying Bluetooth hardware, and starts all 326 * Bluetooth system services. 327 * <p>This is an asynchronous call: it will return immediately, and 328 * clients should listen for {@link #ACTION_STATE_CHANGED} 329 * to be notified of subsequent adapter state changes. If this call returns 330 * true, then the adapter state will immediately transition from {@link 331 * #STATE_OFF} to {@link #STATE_TURNING_ON}, and some time 332 * later transition to either {@link #STATE_OFF} or {@link 333 * #STATE_ON}. If this call returns false then there was an 334 * immediate problem that will prevent the adapter from being turned on - 335 * such as Airplane mode, or the adapter is already turned on. 336 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} 337 * 338 * @return true to indicate adapter startup has begun, or false on 339 * immediate error 340 */ 341 public boolean enable() { 342 try { 343 return mService.enable(); 344 } catch (RemoteException e) {Log.e(TAG, "", e);} 345 return false; 346 } 347 348 /** 349 * Turn off the local Bluetooth adapter. 350 * <p>This gracefully shuts down all Bluetooth connections, stops Bluetooth 351 * system services, and powers down the underlying Bluetooth hardware. 352 * <p>This is an asynchronous call: it will return immediately, and 353 * clients should listen for {@link #ACTION_STATE_CHANGED} 354 * to be notified of subsequent adapter state changes. If this call returns 355 * true, then the adapter state will immediately transition from {@link 356 * #STATE_ON} to {@link #STATE_TURNING_OFF}, and some time 357 * later transition to either {@link #STATE_OFF} or {@link 358 * #STATE_ON}. If this call returns false then there was an 359 * immediate problem that will prevent the adapter from being turned off - 360 * such as the adapter already being turned off. 361 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} 362 * 363 * @return true to indicate adapter shutdown has begun, or false on 364 * immediate error 365 */ 366 public boolean disable() { 367 try { 368 return mService.disable(true); 369 } catch (RemoteException e) {Log.e(TAG, "", e);} 370 return false; 371 } 372 373 /** 374 * Returns the hardware address of the local Bluetooth adapter. 375 * <p>For example, "00:11:22:AA:BB:CC". 376 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 377 * 378 * @return Bluetooth hardware address as string 379 */ 380 public String getAddress() { 381 try { 382 return mService.getAddress(); 383 } catch (RemoteException e) {Log.e(TAG, "", e);} 384 return null; 385 } 386 387 /** 388 * Get the friendly Bluetooth name of the local Bluetooth adapter. 389 * <p>This name is visible to remote Bluetooth devices. 390 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 391 * 392 * @return the Bluetooth name, or null on error 393 */ 394 public String getName() { 395 try { 396 return mService.getName(); 397 } catch (RemoteException e) {Log.e(TAG, "", e);} 398 return null; 399 } 400 401 /** 402 * Set the friendly Bluetooth name of the local Bluetoth adapter. 403 * <p>This name is visible to remote Bluetooth devices. 404 * <p>Valid Bluetooth names are a maximum of 248 UTF-8 characters, however 405 * many remote devices can only display the first 40 characters, and some 406 * may be limited to just 20. 407 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} 408 * 409 * @param name a valid Bluetooth name 410 * @return true if the name was set, false otherwise 411 */ 412 public boolean setName(String name) { 413 try { 414 return mService.setName(name); 415 } catch (RemoteException e) {Log.e(TAG, "", e);} 416 return false; 417 } 418 419 /** 420 * Get the current Bluetooth scan mode of the local Bluetooth adaper. 421 * <p>The Bluetooth scan mode determines if the local adapter is 422 * connectable and/or discoverable from remote Bluetooth devices. 423 * <p>Possible values are: 424 * {@link #SCAN_MODE_NONE}, 425 * {@link #SCAN_MODE_CONNECTABLE}, 426 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}. 427 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 428 * 429 * @return scan mode 430 */ 431 public int getScanMode() { 432 try { 433 return mService.getScanMode(); 434 } catch (RemoteException e) {Log.e(TAG, "", e);} 435 return SCAN_MODE_NONE; 436 } 437 438 /** 439 * Set the Bluetooth scan mode of the local Bluetooth adapter. 440 * <p>The Bluetooth scan mode determines if the local adapter is 441 * connectable and/or discoverable from remote Bluetooth devices. 442 * <p>For privacy reasons, discoverable mode is automatically turned off 443 * after <code>duration</code> seconds. For example, 120 seconds should be 444 * enough for a remote device to initiate and complete its discovery 445 * process. 446 * <p>Valid scan mode values are: 447 * {@link #SCAN_MODE_NONE}, 448 * {@link #SCAN_MODE_CONNECTABLE}, 449 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}. 450 * <p>Requires {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} 451 * <p>Applications cannot set the scan mode. They should use 452 * <code>startActivityForResult( 453 * BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE}) 454 * </code>instead. 455 * 456 * @param mode valid scan mode 457 * @param duration time in seconds to apply scan mode, only used for 458 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE} 459 * @return true if the scan mode was set, false otherwise 460 * @hide 461 */ 462 public boolean setScanMode(int mode, int duration) { 463 try { 464 return mService.setScanMode(mode, duration); 465 } catch (RemoteException e) {Log.e(TAG, "", e);} 466 return false; 467 } 468 469 /** @hide */ 470 public boolean setScanMode(int mode) { 471 return setScanMode(mode, 120); 472 } 473 474 /** @hide */ 475 public int getDiscoverableTimeout() { 476 try { 477 return mService.getDiscoverableTimeout(); 478 } catch (RemoteException e) {Log.e(TAG, "", e);} 479 return -1; 480 } 481 482 /** @hide */ 483 public void setDiscoverableTimeout(int timeout) { 484 try { 485 mService.setDiscoverableTimeout(timeout); 486 } catch (RemoteException e) {Log.e(TAG, "", e);} 487 } 488 489 /** 490 * Start the remote device discovery process. 491 * <p>The discovery process usually involves an inquiry scan of about 12 492 * seconds, followed by a page scan of each new device to retrieve its 493 * Bluetooth name. 494 * <p>This is an asynchronous call, it will return immediately. Register 495 * for {@link #ACTION_DISCOVERY_STARTED} and {@link 496 * #ACTION_DISCOVERY_FINISHED} intents to determine exactly when the 497 * discovery starts and completes. Register for {@link 498 * BluetoothDevice#ACTION_FOUND} to be notified as remote Bluetooth devices 499 * are found. 500 * <p>Device discovery is a heavyweight procedure. New connections to 501 * remote Bluetooth devices should not be attempted while discovery is in 502 * progress, and existing connections will experience limited bandwidth 503 * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing 504 * discovery. 505 * <p>Device discovery will only find remote devices that are currently 506 * <i>discoverable</i> (inquiry scan enabled). Many Bluetooth devices are 507 * not discoverable by default, and need to be entered into a special mode. 508 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}. 509 * 510 * @return true on success, false on error 511 */ 512 public boolean startDiscovery() { 513 try { 514 return mService.startDiscovery(); 515 } catch (RemoteException e) {Log.e(TAG, "", e);} 516 return false; 517 } 518 519 /** 520 * Cancel the current device discovery process. 521 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}. 522 * 523 * @return true on success, false on error 524 */ 525 public boolean cancelDiscovery() { 526 try { 527 mService.cancelDiscovery(); 528 } catch (RemoteException e) {Log.e(TAG, "", e);} 529 return false; 530 } 531 532 /** 533 * Return true if the local Bluetooth adapter is currently in the device 534 * discovery process. 535 * <p>Device discovery is a heavyweight procedure. New connections to 536 * remote Bluetooth devices should not be attempted while discovery is in 537 * progress, and existing connections will experience limited bandwidth 538 * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing 539 * discovery. 540 * <p>Applications can also register for {@link #ACTION_DISCOVERY_STARTED} 541 * or {@link #ACTION_DISCOVERY_FINISHED} to be notified when discovery 542 * starts or completes. 543 * 544 * @return true if discovering 545 */ 546 public boolean isDiscovering() { 547 try { 548 return mService.isDiscovering(); 549 } catch (RemoteException e) {Log.e(TAG, "", e);} 550 return false; 551 } 552 553 /** 554 * Return the set of {@link BluetoothDevice} objects that are bonded 555 * (paired) to the local adapter. 556 * 557 * @return unmodifiable set of {@link BluetoothDevice}, or null on error 558 */ 559 public Set<BluetoothDevice> getBondedDevices() { 560 try { 561 return toDeviceSet(mService.listBonds()); 562 } catch (RemoteException e) {Log.e(TAG, "", e);} 563 return null; 564 } 565 566 /** 567 * Randomly picks RFCOMM channels until none are left. 568 * Avoids reserved channels. 569 */ 570 private static class RfcommChannelPicker { 571 private static final int[] RESERVED_RFCOMM_CHANNELS = new int[] { 572 10, // HFAG 573 11, // HSAG 574 12, // OPUSH 575 19, // PBAP 576 }; 577 private static LinkedList<Integer> sChannels; // master list of non-reserved channels 578 private static Random sRandom; 579 580 private final LinkedList<Integer> mChannels; // local list of channels left to try 581 582 public RfcommChannelPicker() { 583 synchronized (RfcommChannelPicker.class) { 584 if (sChannels == null) { 585 // lazy initialization of non-reserved rfcomm channels 586 sChannels = new LinkedList<Integer>(); 587 for (int i = 1; i <= BluetoothSocket.MAX_RFCOMM_CHANNEL; i++) { 588 sChannels.addLast(new Integer(i)); 589 } 590 for (int reserved : RESERVED_RFCOMM_CHANNELS) { 591 sChannels.remove(new Integer(reserved)); 592 } 593 sRandom = new Random(); 594 } 595 mChannels = (LinkedList<Integer>)sChannels.clone(); 596 } 597 } 598 /* Returns next random channel, or -1 if we're out */ 599 public int nextChannel() { 600 if (mChannels.size() == 0) { 601 return -1; 602 } 603 return mChannels.remove(sRandom.nextInt(mChannels.size())); 604 } 605 } 606 607 /** 608 * Create a listening, secure RFCOMM Bluetooth socket. 609 * <p>A remote device connecting to this socket will be authenticated and 610 * communication on this socket will be encrypted. 611 * <p>Use {@link BluetoothServerSocket#accept} to retrieve incoming 612 * connections from a listening {@link BluetoothServerSocket}. 613 * <p>Valid RFCOMM channels are in range 1 to 30. 614 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} 615 * @param channel RFCOMM channel to listen on 616 * @return a listening RFCOMM BluetoothServerSocket 617 * @throws IOException on error, for example Bluetooth not available, or 618 * insufficient permissions, or channel in use. 619 * @hide 620 */ 621 public BluetoothServerSocket listenUsingRfcommOn(int channel) throws IOException { 622 BluetoothServerSocket socket = new BluetoothServerSocket( 623 BluetoothSocket.TYPE_RFCOMM, true, true, channel); 624 int errno = socket.mSocket.bindListen(); 625 if (errno != 0) { 626 try { 627 socket.close(); 628 } catch (IOException e) {} 629 socket.mSocket.throwErrnoNative(errno); 630 } 631 return socket; 632 } 633 634 /** 635 * Create a listening, secure RFCOMM Bluetooth socket with Service Record. 636 * <p>A remote device connecting to this socket will be authenticated and 637 * communication on this socket will be encrypted. 638 * <p>Use {@link BluetoothServerSocket#accept} to retrieve incoming 639 * connections from a listening {@link BluetoothServerSocket}. 640 * <p>The system will assign an unused RFCOMM channel to listen on. 641 * <p>The system will also register a Service Discovery 642 * Protocol (SDP) record with the local SDP server containing the specified 643 * UUID, service name, and auto-assigned channel. Remote Bluetooth devices 644 * can use the same UUID to query our SDP server and discover which channel 645 * to connect to. This SDP record will be removed when this socket is 646 * closed, or if this application closes unexpectedly. 647 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 648 * @param name service name for SDP record 649 * @param uuid uuid for SDP record 650 * @return a listening RFCOMM BluetoothServerSocket 651 * @throws IOException on error, for example Bluetooth not available, or 652 * insufficient permissions, or channel in use. 653 */ 654 public BluetoothServerSocket listenUsingRfcomm(String name, ParcelUuid uuid) 655 throws IOException { 656 RfcommChannelPicker picker = new RfcommChannelPicker(); 657 658 BluetoothServerSocket socket; 659 int channel; 660 int errno; 661 while (true) { 662 channel = picker.nextChannel(); 663 664 if (channel == -1) { 665 throw new IOException("No available channels"); 666 } 667 668 socket = new BluetoothServerSocket( 669 BluetoothSocket.TYPE_RFCOMM, true, true, channel); 670 errno = socket.mSocket.bindListen(); 671 if (errno == 0) { 672 if (DBG) Log.d(TAG, "listening on RFCOMM channel " + channel); 673 break; // success 674 } else if (errno == BluetoothSocket.EADDRINUSE) { 675 if (DBG) Log.d(TAG, "RFCOMM channel " + channel + " in use"); 676 try { 677 socket.close(); 678 } catch (IOException e) {} 679 continue; // try another channel 680 } else { 681 try { 682 socket.close(); 683 } catch (IOException e) {} 684 socket.mSocket.throwErrnoNative(errno); // Exception as a result of bindListen() 685 } 686 } 687 688 int handle = -1; 689 try { 690 handle = mService.addRfcommServiceRecord(name, uuid, channel, new Binder()); 691 } catch (RemoteException e) {Log.e(TAG, "", e);} 692 if (handle == -1) { 693 try { 694 socket.close(); 695 } catch (IOException e) {} 696 throw new IOException("Not able to register SDP record for " + name); 697 } 698 socket.setCloseHandler(mHandler, handle); 699 return socket; 700 } 701 702 /** 703 * Construct an unencrypted, unauthenticated, RFCOMM server socket. 704 * Call #accept to retrieve connections to this socket. 705 * @return An RFCOMM BluetoothServerSocket 706 * @throws IOException On error, for example Bluetooth not available, or 707 * insufficient permissions. 708 * @hide 709 */ 710 public BluetoothServerSocket listenUsingInsecureRfcommOn(int port) throws IOException { 711 BluetoothServerSocket socket = new BluetoothServerSocket( 712 BluetoothSocket.TYPE_RFCOMM, false, false, port); 713 int errno = socket.mSocket.bindListen(); 714 if (errno != 0) { 715 try { 716 socket.close(); 717 } catch (IOException e) {} 718 socket.mSocket.throwErrnoNative(errno); 719 } 720 return socket; 721 } 722 723 /** 724 * Construct a SCO server socket. 725 * Call #accept to retrieve connections to this socket. 726 * @return A SCO BluetoothServerSocket 727 * @throws IOException On error, for example Bluetooth not available, or 728 * insufficient permissions. 729 * @hide 730 */ 731 public static BluetoothServerSocket listenUsingScoOn() throws IOException { 732 BluetoothServerSocket socket = new BluetoothServerSocket( 733 BluetoothSocket.TYPE_SCO, false, false, -1); 734 int errno = socket.mSocket.bindListen(); 735 if (errno != 0) { 736 try { 737 socket.close(); 738 } catch (IOException e) {} 739 socket.mSocket.throwErrnoNative(errno); 740 } 741 return socket; 742 } 743 744 private Set<BluetoothDevice> toDeviceSet(String[] addresses) { 745 Set<BluetoothDevice> devices = new HashSet<BluetoothDevice>(addresses.length); 746 for (int i = 0; i < addresses.length; i++) { 747 devices.add(getRemoteDevice(addresses[i])); 748 } 749 return Collections.unmodifiableSet(devices); 750 } 751 752 private Handler mHandler = new Handler() { 753 public void handleMessage(Message msg) { 754 /* handle socket closing */ 755 int handle = msg.what; 756 try { 757 if (DBG) Log.d(TAG, "Removing service record " + Integer.toHexString(handle)); 758 mService.removeServiceRecord(handle); 759 } catch (RemoteException e) {Log.e(TAG, "", e);} 760 } 761 }; 762 763 /** 764 * Validate a Bluetooth address, such as "00:43:A8:23:10:F0" 765 * <p>Alphabetic characters must be uppercase to be valid. 766 * 767 * @param address Bluetooth address as string 768 * @return true if the address is valid, false otherwise 769 */ 770 public static boolean checkBluetoothAddress(String address) { 771 if (address == null || address.length() != ADDRESS_LENGTH) { 772 return false; 773 } 774 for (int i = 0; i < ADDRESS_LENGTH; i++) { 775 char c = address.charAt(i); 776 switch (i % 3) { 777 case 0: 778 case 1: 779 if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'F')) { 780 // hex character, OK 781 break; 782 } 783 return false; 784 case 2: 785 if (c == ':') { 786 break; // OK 787 } 788 return false; 789 } 790 } 791 return true; 792 } 793} 794