BluetoothAdapter.java revision 3219ab4de27cd40b2149b0dd13edd412efe40244
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.RemoteException; 22import android.util.Log; 23 24import java.io.IOException; 25import java.util.Collections; 26import java.util.Set; 27import java.util.HashSet; 28 29/** 30 * Represents the local Bluetooth adapter. 31 * 32 * <p>Use {@link android.content.Context#getSystemService} with {@link 33 * android.content.Context#BLUETOOTH_SERVICE} to get the default local 34 * Bluetooth adapter. On most Android devices there is only one local 35 * Bluetotoh adapter. 36 * 37 * <p>Use the {@link BluetoothDevice} class for operations on remote Bluetooth 38 * devices. 39 */ 40public final class BluetoothAdapter { 41 private static final String TAG = "BluetoothAdapter"; 42 43 /** 44 * Sentinel error value for this class. Guaranteed to not equal any other 45 * integer constant in this class. Provided as a convenience for functions 46 * that require a sentinel error value, for example: 47 * <p><code>Intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, 48 * BluetoothAdapter.ERROR)</code> 49 */ 50 public static final int ERROR = Integer.MIN_VALUE; 51 52 /** 53 * Broadcast Action: The state of the local Bluetooth adapter has been 54 * changed. 55 * <p>For example, Bluetooth has been turned on or off. 56 * <p>Always contains the extra fields {@link #EXTRA_STATE} and {@link 57 * #EXTRA_PREVIOUS_STATE} containing the new and old states 58 * respectively. 59 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} to receive. 60 */ 61 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 62 public static final String ACTION_STATE_CHANGED = 63 "android.bluetooth.adapter.action.STATE_CHANGED"; 64 65 /** 66 * Used as an int extra field in {@link #ACTION_STATE_CHANGED} 67 * intents to request the current power state. Possible values are: 68 * {@link #STATE_OFF}, 69 * {@link #STATE_TURNING_ON}, 70 * {@link #STATE_ON}, 71 * {@link #STATE_TURNING_OFF}, 72 */ 73 public static final String EXTRA_STATE = 74 "android.bluetooth.adapter.extra.STATE"; 75 /** 76 * Used as an int extra field in {@link #ACTION_STATE_CHANGED} 77 * intents to request the previous power state. Possible values are: 78 * {@link #STATE_OFF}, 79 * {@link #STATE_TURNING_ON}, 80 * {@link #STATE_ON}, 81 * {@link #STATE_TURNING_OFF}, 82 */ 83 public static final String EXTRA_PREVIOUS_STATE = 84 "android.bluetooth.adapter.extra.PREVIOUS_STATE"; 85 86 /** 87 * Indicates the local Bluetooth adapter is off. 88 */ 89 public static final int STATE_OFF = 10; 90 /** 91 * Indicates the local Bluetooth adapter is turning on. However local 92 * clients should wait for {@link #STATE_ON} before attempting to 93 * use the adapter. 94 */ 95 public static final int STATE_TURNING_ON = 11; 96 /** 97 * Indicates the local Bluetooth adapter is on, and ready for use. 98 */ 99 public static final int STATE_ON = 12; 100 /** 101 * Indicates the local Bluetooth adapter is turning off. Local clients 102 * should immediately attempt graceful disconnection of any remote links. 103 */ 104 public static final int STATE_TURNING_OFF = 13; 105 106 /** 107 * Activity Action: Show a system activity that requests discoverable mode. 108 * <p>Discoverable mode is equivalent to {@link 109 * #SCAN_MODE_CONNECTABLE_DISCOVERABLE}. It allows remote devices to see 110 * this Bluetooth adapter when they perform a discovery. 111 * <p>For privacy, Android is not by default discoverable. 112 * <p>The sender can optionally use extra field {@link 113 * #EXTRA_DISCOVERABLE_DURATION} to request the duration of 114 * discoverability. Currently the default duration is 120 seconds, and 115 * maximum duration is capped at 300 seconds for each request. 116 * <p>Notification of the result of this activity is posted using the 117 * {@link android.app.Activity#onActivityResult} callback. The 118 * <code>resultCode</code> 119 * will be the duration (in seconds) of discoverability, or a negative 120 * value if the user rejected discoverability. 121 * <p>Applications can also listen for {@link #ACTION_SCAN_MODE_CHANGED} 122 * for global notification whenever the scan mode changes. 123 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} 124 */ 125 @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION) 126 public static final String ACTION_REQUEST_DISCOVERABLE = 127 "android.bluetooth.adapter.action.REQUEST_DISCOVERABLE"; 128 129 /** 130 * Used as an optional int extra field in {@link 131 * #ACTION_REQUEST_DISCOVERABLE} intents to request a specific duration 132 * for discoverability in seconds. The current default is 120 seconds, and 133 * requests over 300 seconds will be capped. These values could change. 134 */ 135 public static final String EXTRA_DISCOVERABLE_DURATION = 136 "android.bluetooth.adapter.extra.DISCOVERABLE_DURATION"; 137 138 /** 139 * Broadcast Action: Indicates the Bluetooth scan mode of the local Adapter 140 * has changed. 141 * <p>Always contains the extra fields {@link #EXTRA_SCAN_MODE} and {@link 142 * #EXTRA_PREVIOUS_SCAN_MODE} containing the new and old scan modes 143 * respectively. 144 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 145 */ 146 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 147 public static final String ACTION_SCAN_MODE_CHANGED = 148 "android.bluetooth.adapter.action.SCAN_MODE_CHANGED"; 149 150 /** 151 * Used as an int extra field in {@link #ACTION_SCAN_MODE_CHANGED} 152 * intents to request the current scan mode. Possible values are: 153 * {@link #SCAN_MODE_NONE}, 154 * {@link #SCAN_MODE_CONNECTABLE}, 155 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}, 156 */ 157 public static final String EXTRA_SCAN_MODE = "android.bluetooth.adapter.extra.SCAN_MODE"; 158 /** 159 * Used as an int extra field in {@link #ACTION_SCAN_MODE_CHANGED} 160 * intents to request the previous scan mode. Possible values are: 161 * {@link #SCAN_MODE_NONE}, 162 * {@link #SCAN_MODE_CONNECTABLE}, 163 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}, 164 */ 165 public static final String EXTRA_PREVIOUS_SCAN_MODE = 166 "android.bluetooth.adapter.extra.PREVIOUS_SCAN_MODE"; 167 168 /** 169 * Indicates that both inquiry scan and page scan are disabled on the local 170 * Bluetooth adapter. Therefore this device is neither discoverable 171 * nor connectable from remote Bluetooth devices. 172 */ 173 public static final int SCAN_MODE_NONE = 20; 174 /** 175 * Indicates that inquiry scan is disabled, but page scan is enabled on the 176 * local Bluetooth adapter. Therefore this device is not discoverable from 177 * remote Bluetooth devices, but is connectable from remote devices that 178 * have previously discovered this device. 179 */ 180 public static final int SCAN_MODE_CONNECTABLE = 21; 181 /** 182 * Indicates that both inquiry scan and page scan are enabled on the local 183 * Bluetooth adapter. Therefore this device is both discoverable and 184 * connectable from remote Bluetooth devices. 185 */ 186 public static final int SCAN_MODE_CONNECTABLE_DISCOVERABLE = 23; 187 188 189 /** 190 * Broadcast Action: The local Bluetooth adapter has started the remote 191 * device discovery process. 192 * <p>This usually involves an inquiry scan of about 12 seconds, followed 193 * by a page scan of each new device to retrieve its Bluetooth name. 194 * <p>Register for {@link BluetoothDevice#ACTION_FOUND} to be notified as 195 * remote Bluetooth devices are found. 196 * <p>Device discovery is a heavyweight procedure. New connections to 197 * remote Bluetooth devices should not be attempted while discovery is in 198 * progress, and existing connections will experience limited bandwidth 199 * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing 200 * discovery. 201 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} to receive. 202 */ 203 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 204 public static final String ACTION_DISCOVERY_STARTED = 205 "android.bluetooth.adapter.action.DISCOVERY_STARTED"; 206 /** 207 * Broadcast Action: The local Bluetooth adapter has finished the device 208 * discovery process. 209 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} to receive. 210 */ 211 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 212 public static final String ACTION_DISCOVERY_FINISHED = 213 "android.bluetooth.adapter.action.DISCOVERY_FINISHED"; 214 215 /** 216 * Broadcast Action: The local Bluetooth adapter has changed its friendly 217 * Bluetooth name. 218 * <p>This name is visible to remote Bluetooth devices. 219 * <p>Always contains the extra field {@link #EXTRA_LOCAL_NAME} containing 220 * the name. 221 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} to receive. 222 */ 223 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 224 public static final String ACTION_LOCAL_NAME_CHANGED = 225 "android.bluetooth.adapter.action.LOCAL_NAME_CHANGED"; 226 /** 227 * Used as a String extra field in {@link #ACTION_LOCAL_NAME_CHANGED} 228 * intents to request the local Bluetooth name. 229 */ 230 public static final String EXTRA_LOCAL_NAME = "android.bluetooth.adapter.extra.LOCAL_NAME"; 231 232 private static final int ADDRESS_LENGTH = 17; 233 234 private final IBluetooth mService; 235 236 /** 237 * Do not use this constructor. Use Context.getSystemService() instead. 238 * @hide 239 */ 240 public BluetoothAdapter(IBluetooth service) { 241 if (service == null) { 242 throw new IllegalArgumentException("service is null"); 243 } 244 mService = service; 245 } 246 247 /** 248 * Get a {@link BluetoothDevice} object for the given Bluetooth hardware 249 * address. 250 * <p>Valid Bluetooth hardware addresses must be upper case, in a format 251 * such as "00:11:22:33:AA:BB". The helper {@link #checkBluetoothAddress} is 252 * available to validate a Bluetooth address. 253 * <p>A {@link BluetoothDevice} will always be returned for a valid 254 * hardware address, even if this adapter has never seen that device. 255 * 256 * @param address valid Bluetooth MAC address 257 * @throws IllegalArgumentException if address is invalid 258 */ 259 public BluetoothDevice getRemoteDevice(String address) { 260 return new BluetoothDevice(address); 261 } 262 263 /** 264 * Return true if Bluetooth is currently enabled and ready for use. 265 * <p>Equivalent to: 266 * <code>getBluetoothState() == STATE_ON</code> 267 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 268 * 269 * @return true if the local adapter is turned on 270 */ 271 public boolean isEnabled() { 272 try { 273 return mService.isEnabled(); 274 } catch (RemoteException e) {Log.e(TAG, "", e);} 275 return false; 276 } 277 278 /** 279 * Get the current state of the local Bluetooth adapter. 280 * <p>Possible return values are 281 * {@link #STATE_OFF}, 282 * {@link #STATE_TURNING_ON}, 283 * {@link #STATE_ON}, 284 * {@link #STATE_TURNING_OFF}. 285 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 286 * 287 * @return current state of Bluetooth adapter 288 */ 289 public int getState() { 290 try { 291 return mService.getBluetoothState(); 292 } catch (RemoteException e) {Log.e(TAG, "", e);} 293 return STATE_OFF; 294 } 295 296 /** 297 * Turn on the local Bluetooth adapter. 298 * <p>This powers on the underlying Bluetooth hardware, and starts all 299 * Bluetooth system services. 300 * <p>This is an asynchronous call: it will return immediately, and 301 * clients should listen for {@link #ACTION_STATE_CHANGED} 302 * to be notified of subsequent adapter state changes. If this call returns 303 * true, then the adapter state will immediately transition from {@link 304 * #STATE_OFF} to {@link #STATE_TURNING_ON}, and some time 305 * later transition to either {@link #STATE_OFF} or {@link 306 * #STATE_ON}. If this call returns false then there was an 307 * immediate problem that will prevent the adapter from being turned on - 308 * such as Airplane mode, or the adapter is already turned on. 309 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} 310 * 311 * @return true to indicate adapter startup has begun, or false on 312 * immediate error 313 */ 314 public boolean enable() { 315 try { 316 return mService.enable(); 317 } catch (RemoteException e) {Log.e(TAG, "", e);} 318 return false; 319 } 320 321 /** 322 * Turn off the local Bluetooth adapter. 323 * <p>This gracefully shuts down all Bluetooth connections, stops Bluetooth 324 * system services, and powers down the underlying Bluetooth hardware. 325 * <p>This is an asynchronous call: it will return immediately, and 326 * clients should listen for {@link #ACTION_STATE_CHANGED} 327 * to be notified of subsequent adapter state changes. If this call returns 328 * true, then the adapter state will immediately transition from {@link 329 * #STATE_ON} to {@link #STATE_TURNING_OFF}, and some time 330 * later transition to either {@link #STATE_OFF} or {@link 331 * #STATE_ON}. If this call returns false then there was an 332 * immediate problem that will prevent the adapter from being turned off - 333 * such as the adapter already being turned off. 334 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} 335 * 336 * @return true to indicate adapter shutdown has begun, or false on 337 * immediate error 338 */ 339 public boolean disable() { 340 try { 341 return mService.disable(true); 342 } catch (RemoteException e) {Log.e(TAG, "", e);} 343 return false; 344 } 345 346 /** 347 * Returns the hardware address of the local Bluetooth adapter. 348 * <p>For example, "00:11:22:AA:BB:CC". 349 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 350 * 351 * @return Bluetooth hardware address as string 352 */ 353 public String getAddress() { 354 try { 355 return mService.getAddress(); 356 } catch (RemoteException e) {Log.e(TAG, "", e);} 357 return null; 358 } 359 360 /** 361 * Get the friendly Bluetooth name of the local Bluetooth adapter. 362 * <p>This name is visible to remote Bluetooth devices. 363 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 364 * 365 * @return the Bluetooth name, or null on error 366 */ 367 public String getName() { 368 try { 369 return mService.getName(); 370 } catch (RemoteException e) {Log.e(TAG, "", e);} 371 return null; 372 } 373 374 /** 375 * Set the friendly Bluetooth name of the local Bluetoth adapter. 376 * <p>This name is visible to remote Bluetooth devices. 377 * <p>Valid Bluetooth names are a maximum of 248 UTF-8 characters, however 378 * many remote devices can only display the first 40 characters, and some 379 * may be limited to just 20. 380 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} 381 * 382 * @param name a valid Bluetooth name 383 * @return true if the name was set, false otherwise 384 */ 385 public boolean setName(String name) { 386 try { 387 return mService.setName(name); 388 } catch (RemoteException e) {Log.e(TAG, "", e);} 389 return false; 390 } 391 392 /** 393 * Get the current Bluetooth scan mode of the local Bluetooth adaper. 394 * <p>The Bluetooth scan mode determines if the local adapter is 395 * connectable and/or discoverable from remote Bluetooth devices. 396 * <p>Possible values are: 397 * {@link #SCAN_MODE_NONE}, 398 * {@link #SCAN_MODE_CONNECTABLE}, 399 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}. 400 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 401 * 402 * @return scan mode 403 */ 404 public int getScanMode() { 405 try { 406 return mService.getScanMode(); 407 } catch (RemoteException e) {Log.e(TAG, "", e);} 408 return SCAN_MODE_NONE; 409 } 410 411 /** 412 * Set the Bluetooth scan mode of the local Bluetooth adapter. 413 * <p>The Bluetooth scan mode determines if the local adapter is 414 * connectable and/or discoverable from remote Bluetooth devices. 415 * <p>For privacy reasons, it is recommended to limit the duration of time 416 * that the local adapter remains in a discoverable scan mode. For example, 417 * 2 minutes is a generous time to allow a remote Bluetooth device to 418 * initiate and complete its discovery process. 419 * <p>Valid scan mode values are: 420 * {@link #SCAN_MODE_NONE}, 421 * {@link #SCAN_MODE_CONNECTABLE}, 422 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}. 423 * <p>Requires {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} 424 * <p>Applications cannot set the scan mode. They should use 425 * <code>startActivityForResult( 426 * BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE}) 427 * </code>instead. 428 * 429 * @param mode valid scan mode 430 * @return true if the scan mode was set, false otherwise 431 * @hide 432 */ 433 public boolean setScanMode(int mode) { 434 try { 435 return mService.setScanMode(mode); 436 } catch (RemoteException e) {Log.e(TAG, "", e);} 437 return false; 438 } 439 440 /** @hide */ 441 public int getDiscoverableTimeout() { 442 try { 443 return mService.getDiscoverableTimeout(); 444 } catch (RemoteException e) {Log.e(TAG, "", e);} 445 return -1; 446 } 447 448 /** @hide */ 449 public void setDiscoverableTimeout(int timeout) { 450 try { 451 mService.setDiscoverableTimeout(timeout); 452 } catch (RemoteException e) {Log.e(TAG, "", e);} 453 } 454 455 /** 456 * Start the remote device discovery process. 457 * <p>The discovery process usually involves an inquiry scan of about 12 458 * seconds, followed by a page scan of each new device to retrieve its 459 * Bluetooth name. 460 * <p>This is an asynchronous call, it will return immediately. Register 461 * for {@link #ACTION_DISCOVERY_STARTED} and {@link 462 * #ACTION_DISCOVERY_FINISHED} intents to determine exactly when the 463 * discovery starts and completes. Register for {@link 464 * BluetoothDevice#ACTION_FOUND} to be notified as remote Bluetooth devices 465 * are found. 466 * <p>Device discovery is a heavyweight procedure. New connections to 467 * remote Bluetooth devices should not be attempted while discovery is in 468 * progress, and existing connections will experience limited bandwidth 469 * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing 470 * discovery. 471 * <p>Device discovery will only find remote devices that are currently 472 * <i>discoverable</i> (inquiry scan enabled). Many Bluetooth devices are 473 * not discoverable by default, and need to be entered into a special mode. 474 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}. 475 * 476 * @return true on success, false on error 477 */ 478 public boolean startDiscovery() { 479 try { 480 return mService.startDiscovery(); 481 } catch (RemoteException e) {Log.e(TAG, "", e);} 482 return false; 483 } 484 485 /** 486 * Cancel the current device discovery process. 487 * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}. 488 * 489 * @return true on success, false on error 490 */ 491 public boolean cancelDiscovery() { 492 try { 493 mService.cancelDiscovery(); 494 } catch (RemoteException e) {Log.e(TAG, "", e);} 495 return false; 496 } 497 498 /** 499 * Return true if the local Bluetooth adapter is currently in the device 500 * discovery process. 501 * <p>Device discovery is a heavyweight procedure. New connections to 502 * remote Bluetooth devices should not be attempted while discovery is in 503 * progress, and existing connections will experience limited bandwidth 504 * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing 505 * discovery. 506 * <p>Applications can also register for {@link #ACTION_DISCOVERY_STARTED} 507 * or {@link #ACTION_DISCOVERY_FINISHED} to be notified when discovery 508 * starts or completes. 509 * 510 * @return true if discovering 511 */ 512 public boolean isDiscovering() { 513 try { 514 return mService.isDiscovering(); 515 } catch (RemoteException e) {Log.e(TAG, "", e);} 516 return false; 517 } 518 519 /** 520 * Return the set of {@link BluetoothDevice} objects that are bonded 521 * (paired) to the local adapter. 522 * 523 * @return unmodifiable set of {@link BluetoothDevice}, or null on error 524 */ 525 public Set<BluetoothDevice> getBondedDevices() { 526 try { 527 return toDeviceSet(mService.listBonds()); 528 } catch (RemoteException e) {Log.e(TAG, "", e);} 529 return null; 530 } 531 532 /** 533 * Create a listening, secure RFCOMM Bluetooth socket. 534 * <p>A remote device connecting to this socket will be authenticated and 535 * communication on this socket will be encrypted. 536 * <p>Use {@link BluetoothServerSocket#accept} to retrieve incoming 537 * connections to listening {@link BluetoothServerSocket}. 538 * <p>Valid RFCOMM channels are in range 1 to 30. 539 * <p>Requires {@link android.Manifest.permission#BLUETOOTH} 540 * @param channel RFCOMM channel to listen on 541 * @return a listening RFCOMM BluetoothServerSocket 542 * @throws IOException on error, for example Bluetooth not available, or 543 * insufficient permissions, or channel in use. 544 */ 545 public BluetoothServerSocket listenUsingRfcommOn(int channel) throws IOException { 546 BluetoothServerSocket socket = new BluetoothServerSocket( 547 BluetoothSocket.TYPE_RFCOMM, true, true, channel); 548 try { 549 socket.mSocket.bindListen(); 550 } catch (IOException e) { 551 try { 552 socket.close(); 553 } catch (IOException e2) { } 554 throw e; 555 } 556 return socket; 557 } 558 559 /** 560 * Construct an unencrypted, unauthenticated, RFCOMM server socket. 561 * Call #accept to retrieve connections to this socket. 562 * @return An RFCOMM BluetoothServerSocket 563 * @throws IOException On error, for example Bluetooth not available, or 564 * insufficient permissions. 565 * @hide 566 */ 567 public BluetoothServerSocket listenUsingInsecureRfcommOn(int port) throws IOException { 568 BluetoothServerSocket socket = new BluetoothServerSocket( 569 BluetoothSocket.TYPE_RFCOMM, false, false, port); 570 try { 571 socket.mSocket.bindListen(); 572 } catch (IOException e) { 573 try { 574 socket.close(); 575 } catch (IOException e2) { } 576 throw e; 577 } 578 return socket; 579 } 580 581 /** 582 * Construct a SCO server socket. 583 * Call #accept to retrieve connections to this socket. 584 * @return A SCO BluetoothServerSocket 585 * @throws IOException On error, for example Bluetooth not available, or 586 * insufficient permissions. 587 * @hide 588 */ 589 public static BluetoothServerSocket listenUsingScoOn() throws IOException { 590 BluetoothServerSocket socket = new BluetoothServerSocket( 591 BluetoothSocket.TYPE_SCO, false, false, -1); 592 try { 593 socket.mSocket.bindListen(); 594 } catch (IOException e) { 595 try { 596 socket.close(); 597 } catch (IOException e2) { } 598 throw e; 599 } 600 return socket; 601 } 602 603 private Set<BluetoothDevice> toDeviceSet(String[] addresses) { 604 Set<BluetoothDevice> devices = new HashSet<BluetoothDevice>(addresses.length); 605 for (int i = 0; i < addresses.length; i++) { 606 devices.add(getRemoteDevice(addresses[i])); 607 } 608 return Collections.unmodifiableSet(devices); 609 } 610 611 /** 612 * Validate a Bluetooth address, such as "00:43:A8:23:10:F0" 613 * <p>Alphabetic characters must be uppercase to be valid. 614 * 615 * @param address Bluetooth address as string 616 * @return true if the address is valid, false otherwise 617 */ 618 public static boolean checkBluetoothAddress(String address) { 619 if (address == null || address.length() != ADDRESS_LENGTH) { 620 return false; 621 } 622 for (int i = 0; i < ADDRESS_LENGTH; i++) { 623 char c = address.charAt(i); 624 switch (i % 3) { 625 case 0: 626 case 1: 627 if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'F')) { 628 // hex character, OK 629 break; 630 } 631 return false; 632 case 2: 633 if (c == ':') { 634 break; // OK 635 } 636 return false; 637 } 638 } 639 return true; 640 } 641} 642