/* * Copyright (C) 2009 The Android Open Source Project * Copyright (c) 2011, The Linux Foundation. All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package android.bluetooth; import android.annotation.SdkConstant; import android.annotation.SdkConstant.SdkConstantType; import android.os.Binder; import android.os.Handler; import android.os.IBinder; import android.os.Message; import android.os.ParcelUuid; import android.os.RemoteException; import android.os.ServiceManager; import android.util.Log; import android.util.Pair; import java.io.IOException; import java.util.Arrays; import java.util.Collections; import java.util.HashSet; import java.util.LinkedList; import java.util.Random; import java.util.Set; import java.util.UUID; /** * Represents the local device Bluetooth adapter. The {@link BluetoothAdapter} * lets you perform fundamental Bluetooth tasks, such as initiate * device discovery, query a list of bonded (paired) devices, * instantiate a {@link BluetoothDevice} using a known MAC address, and create * a {@link BluetoothServerSocket} to listen for connection requests from other * devices. * *

To get a {@link BluetoothAdapter} representing the local Bluetooth * adapter, call the static {@link #getDefaultAdapter} method. * Fundamentally, this is your starting point for all * Bluetooth actions. Once you have the local adapter, you can get a set of * {@link BluetoothDevice} objects representing all paired devices with * {@link #getBondedDevices()}; start device discovery with * {@link #startDiscovery()}; or create a {@link BluetoothServerSocket} to * listen for incoming connection requests with * {@link #listenUsingRfcommWithServiceRecord(String,UUID)}. * *

Note: * Most methods require the {@link android.Manifest.permission#BLUETOOTH} * permission and some also require the * {@link android.Manifest.permission#BLUETOOTH_ADMIN} permission. * * {@see BluetoothDevice} * {@see BluetoothServerSocket} */ public final class BluetoothAdapter { private static final String TAG = "BluetoothAdapter"; private static final boolean DBG = false; /** * Sentinel error value for this class. Guaranteed to not equal any other * integer constant in this class. Provided as a convenience for functions * that require a sentinel error value, for example: *

Intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, * BluetoothAdapter.ERROR) */ public static final int ERROR = Integer.MIN_VALUE; /** * Broadcast Action: The state of the local Bluetooth adapter has been * changed. *

For example, Bluetooth has been turned on or off. *

Always contains the extra fields {@link #EXTRA_STATE} and {@link * #EXTRA_PREVIOUS_STATE} containing the new and old states * respectively. *

Requires {@link android.Manifest.permission#BLUETOOTH} to receive. */ @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String ACTION_STATE_CHANGED = "android.bluetooth.adapter.action.STATE_CHANGED"; /** * Used as an int extra field in {@link #ACTION_STATE_CHANGED} * intents to request the current power state. Possible values are: * {@link #STATE_OFF}, * {@link #STATE_TURNING_ON}, * {@link #STATE_ON}, * {@link #STATE_TURNING_OFF}, */ public static final String EXTRA_STATE = "android.bluetooth.adapter.extra.STATE"; /** * Used as an int extra field in {@link #ACTION_STATE_CHANGED} * intents to request the previous power state. Possible values are: * {@link #STATE_OFF}, * {@link #STATE_TURNING_ON}, * {@link #STATE_ON}, * {@link #STATE_TURNING_OFF}, */ public static final String EXTRA_PREVIOUS_STATE = "android.bluetooth.adapter.extra.PREVIOUS_STATE"; /** * Indicates the local Bluetooth adapter is off. */ public static final int STATE_OFF = 10; /** * Indicates the local Bluetooth adapter is turning on. However local * clients should wait for {@link #STATE_ON} before attempting to * use the adapter. */ public static final int STATE_TURNING_ON = 11; /** * Indicates the local Bluetooth adapter is on, and ready for use. */ public static final int STATE_ON = 12; /** * Indicates the local Bluetooth adapter is turning off. Local clients * should immediately attempt graceful disconnection of any remote links. */ public static final int STATE_TURNING_OFF = 13; /** * Activity Action: Show a system activity that requests discoverable mode. * This activity will also request the user to turn on Bluetooth if it * is not currently enabled. *

Discoverable mode is equivalent to {@link * #SCAN_MODE_CONNECTABLE_DISCOVERABLE}. It allows remote devices to see * this Bluetooth adapter when they perform a discovery. *

For privacy, Android is not discoverable by default. *

The sender of this Intent can optionally use extra field {@link * #EXTRA_DISCOVERABLE_DURATION} to request the duration of * discoverability. Currently the default duration is 120 seconds, and * maximum duration is capped at 300 seconds for each request. *

Notification of the result of this activity is posted using the * {@link android.app.Activity#onActivityResult} callback. The * resultCode * will be the duration (in seconds) of discoverability or * {@link android.app.Activity#RESULT_CANCELED} if the user rejected * discoverability or an error has occurred. *

Applications can also listen for {@link #ACTION_SCAN_MODE_CHANGED} * for global notification whenever the scan mode changes. For example, an * application can be notified when the device has ended discoverability. *

Requires {@link android.Manifest.permission#BLUETOOTH} */ @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION) public static final String ACTION_REQUEST_DISCOVERABLE = "android.bluetooth.adapter.action.REQUEST_DISCOVERABLE"; /** * Used as an optional int extra field in {@link * #ACTION_REQUEST_DISCOVERABLE} intents to request a specific duration * for discoverability in seconds. The current default is 120 seconds, and * requests over 300 seconds will be capped. These values could change. */ public static final String EXTRA_DISCOVERABLE_DURATION = "android.bluetooth.adapter.extra.DISCOVERABLE_DURATION"; /** * Activity Action: Show a system activity that allows the user to turn on * Bluetooth. *

This system activity will return once Bluetooth has completed turning * on, or the user has decided not to turn Bluetooth on. *

Notification of the result of this activity is posted using the * {@link android.app.Activity#onActivityResult} callback. The * resultCode * will be {@link android.app.Activity#RESULT_OK} if Bluetooth has been * turned on or {@link android.app.Activity#RESULT_CANCELED} if the user * has rejected the request or an error has occurred. *

Applications can also listen for {@link #ACTION_STATE_CHANGED} * for global notification whenever Bluetooth is turned on or off. *

Requires {@link android.Manifest.permission#BLUETOOTH} */ @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION) public static final String ACTION_REQUEST_ENABLE = "android.bluetooth.adapter.action.REQUEST_ENABLE"; /** * Broadcast Action: Indicates the Bluetooth scan mode of the local Adapter * has changed. *

Always contains the extra fields {@link #EXTRA_SCAN_MODE} and {@link * #EXTRA_PREVIOUS_SCAN_MODE} containing the new and old scan modes * respectively. *

Requires {@link android.Manifest.permission#BLUETOOTH} */ @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String ACTION_SCAN_MODE_CHANGED = "android.bluetooth.adapter.action.SCAN_MODE_CHANGED"; /** * Used as an int extra field in {@link #ACTION_SCAN_MODE_CHANGED} * intents to request the current scan mode. Possible values are: * {@link #SCAN_MODE_NONE}, * {@link #SCAN_MODE_CONNECTABLE}, * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}, */ public static final String EXTRA_SCAN_MODE = "android.bluetooth.adapter.extra.SCAN_MODE"; /** * Used as an int extra field in {@link #ACTION_SCAN_MODE_CHANGED} * intents to request the previous scan mode. Possible values are: * {@link #SCAN_MODE_NONE}, * {@link #SCAN_MODE_CONNECTABLE}, * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}, */ public static final String EXTRA_PREVIOUS_SCAN_MODE = "android.bluetooth.adapter.extra.PREVIOUS_SCAN_MODE"; /** * Indicates that both inquiry scan and page scan are disabled on the local * Bluetooth adapter. Therefore this device is neither discoverable * nor connectable from remote Bluetooth devices. */ public static final int SCAN_MODE_NONE = 20; /** * Indicates that inquiry scan is disabled, but page scan is enabled on the * local Bluetooth adapter. Therefore this device is not discoverable from * remote Bluetooth devices, but is connectable from remote devices that * have previously discovered this device. */ public static final int SCAN_MODE_CONNECTABLE = 21; /** * Indicates that both inquiry scan and page scan are enabled on the local * Bluetooth adapter. Therefore this device is both discoverable and * connectable from remote Bluetooth devices. */ public static final int SCAN_MODE_CONNECTABLE_DISCOVERABLE = 23; /** * Broadcast Action: The local Bluetooth adapter has started the remote * device discovery process. *

This usually involves an inquiry scan of about 12 seconds, followed * by a page scan of each new device to retrieve its Bluetooth name. *

Register for {@link BluetoothDevice#ACTION_FOUND} to be notified as * remote Bluetooth devices are found. *

Device discovery is a heavyweight procedure. New connections to * remote Bluetooth devices should not be attempted while discovery is in * progress, and existing connections will experience limited bandwidth * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing * discovery. *

Requires {@link android.Manifest.permission#BLUETOOTH} to receive. */ @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String ACTION_DISCOVERY_STARTED = "android.bluetooth.adapter.action.DISCOVERY_STARTED"; /** * Broadcast Action: The local Bluetooth adapter has finished the device * discovery process. *

Requires {@link android.Manifest.permission#BLUETOOTH} to receive. */ @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String ACTION_DISCOVERY_FINISHED = "android.bluetooth.adapter.action.DISCOVERY_FINISHED"; /** * Broadcast Action: The local Bluetooth adapter has changed its friendly * Bluetooth name. *

This name is visible to remote Bluetooth devices. *

Always contains the extra field {@link #EXTRA_LOCAL_NAME} containing * the name. *

Requires {@link android.Manifest.permission#BLUETOOTH} to receive. */ @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String ACTION_LOCAL_NAME_CHANGED = "android.bluetooth.adapter.action.LOCAL_NAME_CHANGED"; /** * Used as a String extra field in {@link #ACTION_LOCAL_NAME_CHANGED} * intents to request the local Bluetooth name. */ public static final String EXTRA_LOCAL_NAME = "android.bluetooth.adapter.extra.LOCAL_NAME"; /** @hide */ public static final String BLUETOOTH_SERVICE = "bluetooth"; private static final int ADDRESS_LENGTH = 17; /** * Lazily initialized singleton. Guaranteed final after first object * constructed. */ private static BluetoothAdapter sAdapter; private final IBluetooth mService; /** * Get a handle to the default local Bluetooth adapter. *

Currently Android only supports one Bluetooth adapter, but the API * could be extended to support more. This will always return the default * adapter. * @return the default local adapter, or null if Bluetooth is not supported * on this hardware platform */ public static synchronized BluetoothAdapter getDefaultAdapter() { if (sAdapter == null) { IBinder b = ServiceManager.getService(BluetoothAdapter.BLUETOOTH_SERVICE); if (b != null) { IBluetooth service = IBluetooth.Stub.asInterface(b); sAdapter = new BluetoothAdapter(service); } } return sAdapter; } /** * Use {@link #getDefaultAdapter} to get the BluetoothAdapter instance. * @hide */ public BluetoothAdapter(IBluetooth service) { if (service == null) { throw new IllegalArgumentException("service is null"); } mService = service; } /** * Get a {@link BluetoothDevice} object for the given Bluetooth hardware * address. *

Valid Bluetooth hardware addresses must be upper case, in a format * such as "00:11:22:33:AA:BB". The helper {@link #checkBluetoothAddress} is * available to validate a Bluetooth address. *

A {@link BluetoothDevice} will always be returned for a valid * hardware address, even if this adapter has never seen that device. * * @param address valid Bluetooth MAC address * @throws IllegalArgumentException if address is invalid */ public BluetoothDevice getRemoteDevice(String address) { return new BluetoothDevice(address); } /** * Return true if Bluetooth is currently enabled and ready for use. *

Equivalent to: * getBluetoothState() == STATE_ON *

Requires {@link android.Manifest.permission#BLUETOOTH} * * @return true if the local adapter is turned on */ public boolean isEnabled() { try { return mService.isEnabled(); } catch (RemoteException e) {Log.e(TAG, "", e);} return false; } /** * Get the current state of the local Bluetooth adapter. *

Possible return values are * {@link #STATE_OFF}, * {@link #STATE_TURNING_ON}, * {@link #STATE_ON}, * {@link #STATE_TURNING_OFF}. *

Requires {@link android.Manifest.permission#BLUETOOTH} * * @return current state of Bluetooth adapter */ public int getState() { try { return mService.getBluetoothState(); } catch (RemoteException e) {Log.e(TAG, "", e);} return STATE_OFF; } /** * Turn on the local Bluetooth adapter—do not use without explicit * user action to turn on Bluetooth. *

This powers on the underlying Bluetooth hardware, and starts all * Bluetooth system services. *

Bluetooth should never be enabled without * direct user consent. If you want to turn on Bluetooth in order * to create a wireless connection, you should use the {@link * #ACTION_REQUEST_ENABLE} Intent, which will raise a dialog that requests * user permission to turn on Bluetooth. The {@link #enable()} method is * provided only for applications that include a user interface for changing * system settings, such as a "power manager" app.

*

This is an asynchronous call: it will return immediately, and * clients should listen for {@link #ACTION_STATE_CHANGED} * to be notified of subsequent adapter state changes. If this call returns * true, then the adapter state will immediately transition from {@link * #STATE_OFF} to {@link #STATE_TURNING_ON}, and some time * later transition to either {@link #STATE_OFF} or {@link * #STATE_ON}. If this call returns false then there was an * immediate problem that will prevent the adapter from being turned on - * such as Airplane mode, or the adapter is already turned on. *

Requires the {@link android.Manifest.permission#BLUETOOTH_ADMIN} * permission * * @return true to indicate adapter startup has begun, or false on * immediate error */ public boolean enable() { try { return mService.enable(); } catch (RemoteException e) {Log.e(TAG, "", e);} return false; } /** * Turn off the local Bluetooth adapter—do not use without explicit * user action to turn off Bluetooth. *

This gracefully shuts down all Bluetooth connections, stops Bluetooth * system services, and powers down the underlying Bluetooth hardware. *

Bluetooth should never be disabled without * direct user consent. The {@link #disable()} method is * provided only for applications that include a user interface for changing * system settings, such as a "power manager" app.

*

This is an asynchronous call: it will return immediately, and * clients should listen for {@link #ACTION_STATE_CHANGED} * to be notified of subsequent adapter state changes. If this call returns * true, then the adapter state will immediately transition from {@link * #STATE_ON} to {@link #STATE_TURNING_OFF}, and some time * later transition to either {@link #STATE_OFF} or {@link * #STATE_ON}. If this call returns false then there was an * immediate problem that will prevent the adapter from being turned off - * such as the adapter already being turned off. *

Requires the {@link android.Manifest.permission#BLUETOOTH_ADMIN} * permission * * @return true to indicate adapter shutdown has begun, or false on * immediate error */ public boolean disable() { try { return mService.disable(true); } catch (RemoteException e) {Log.e(TAG, "", e);} return false; } /** * Returns the hardware address of the local Bluetooth adapter. *

For example, "00:11:22:AA:BB:CC". *

Requires {@link android.Manifest.permission#BLUETOOTH} * * @return Bluetooth hardware address as string */ public String getAddress() { try { return mService.getAddress(); } catch (RemoteException e) {Log.e(TAG, "", e);} return null; } /** * Get the friendly Bluetooth name of the local Bluetooth adapter. *

This name is visible to remote Bluetooth devices. *

Requires {@link android.Manifest.permission#BLUETOOTH} * * @return the Bluetooth name, or null on error */ public String getName() { try { return mService.getName(); } catch (RemoteException e) {Log.e(TAG, "", e);} return null; } /** * Get the Class of Device (COD) of the local Bluetooth adapter. *

Requires {@link android.Manifest.permission#BLUETOOTH} * * @return the Bluetooth COD, or null on error * @hide */ public String getCOD() { try { return mService.getCOD(); } catch (RemoteException e) {Log.e(TAG, "", e);} return null; } /** * Set the friendly Bluetooth name of the local Bluetooth adapter. *

This name is visible to remote Bluetooth devices. *

Valid Bluetooth names are a maximum of 248 bytes using UTF-8 * encoding, although many remote devices can only display the first * 40 characters, and some may be limited to just 20. *

If Bluetooth state is not {@link #STATE_ON}, this API * will return false. After turning on Bluetooth, * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON} * to get the updated value. *

Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} * * @param name a valid Bluetooth name * @return true if the name was set, false otherwise */ public boolean setName(String name) { if (getState() != STATE_ON) return false; try { return mService.setName(name); } catch (RemoteException e) {Log.e(TAG, "", e);} return false; } /** * Set whether WiFi can be used for Bluetooth transfers *

Requires {@link android.Manifest.permission#BLUETOOTH} * @param enable Set true allows WiFi (system default) * * @hide */ public void setUseWifi(boolean enable) { try { mService.setUseWifiForBtTransfers(enable); } catch (RemoteException e) {Log.e(TAG, "", e);} } /** * Get the current Bluetooth scan mode of the local Bluetooth adaper. *

The Bluetooth scan mode determines if the local adapter is * connectable and/or discoverable from remote Bluetooth devices. *

Possible values are: * {@link #SCAN_MODE_NONE}, * {@link #SCAN_MODE_CONNECTABLE}, * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}. *

If Bluetooth state is not {@link #STATE_ON}, this API * will return {@link #SCAN_MODE_NONE}. After turning on Bluetooth, * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON} * to get the updated value. *

Requires {@link android.Manifest.permission#BLUETOOTH} * * @return scan mode */ public int getScanMode() { if (getState() != STATE_ON) return SCAN_MODE_NONE; try { return mService.getScanMode(); } catch (RemoteException e) {Log.e(TAG, "", e);} return SCAN_MODE_NONE; } /** * Set the Bluetooth scan mode of the local Bluetooth adapter. *

The Bluetooth scan mode determines if the local adapter is * connectable and/or discoverable from remote Bluetooth devices. *

For privacy reasons, discoverable mode is automatically turned off * after duration seconds. For example, 120 seconds should be * enough for a remote device to initiate and complete its discovery * process. *

Valid scan mode values are: * {@link #SCAN_MODE_NONE}, * {@link #SCAN_MODE_CONNECTABLE}, * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}. *

If Bluetooth state is not {@link #STATE_ON}, this API * will return false. After turning on Bluetooth, * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON} * to get the updated value. *

Requires {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} *

Applications cannot set the scan mode. They should use * startActivityForResult( * BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE}) * instead. * * @param mode valid scan mode * @param duration time in seconds to apply scan mode, only used for * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE} * @return true if the scan mode was set, false otherwise * @hide */ public boolean setScanMode(int mode, int duration) { if (getState() != STATE_ON) return false; try { return mService.setScanMode(mode, duration); } catch (RemoteException e) {Log.e(TAG, "", e);} return false; } /** @hide */ public boolean setScanMode(int mode) { if (getState() != STATE_ON) return false; return setScanMode(mode, 120); } /** @hide */ public int getDiscoverableTimeout() { if (getState() != STATE_ON) return -1; try { return mService.getDiscoverableTimeout(); } catch (RemoteException e) {Log.e(TAG, "", e);} return -1; } /** @hide */ public void setDiscoverableTimeout(int timeout) { if (getState() != STATE_ON) return; try { mService.setDiscoverableTimeout(timeout); } catch (RemoteException e) {Log.e(TAG, "", e);} } /** * Start the remote device discovery process. *

The discovery process usually involves an inquiry scan of about 12 * seconds, followed by a page scan of each new device to retrieve its * Bluetooth name. *

This is an asynchronous call, it will return immediately. Register * for {@link #ACTION_DISCOVERY_STARTED} and {@link * #ACTION_DISCOVERY_FINISHED} intents to determine exactly when the * discovery starts and completes. Register for {@link * BluetoothDevice#ACTION_FOUND} to be notified as remote Bluetooth devices * are found. *

Device discovery is a heavyweight procedure. New connections to * remote Bluetooth devices should not be attempted while discovery is in * progress, and existing connections will experience limited bandwidth * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing * discovery. Discovery is not managed by the Activity, * but is run as a system service, so an application should always call * {@link BluetoothAdapter#cancelDiscovery()} even if it * did not directly request a discovery, just to be sure. *

Device discovery will only find remote devices that are currently * discoverable (inquiry scan enabled). Many Bluetooth devices are * not discoverable by default, and need to be entered into a special mode. *

If Bluetooth state is not {@link #STATE_ON}, this API * will return false. After turning on Bluetooth, * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON} * to get the updated value. *

Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}. * * @return true on success, false on error */ public boolean startDiscovery() { if (getState() != STATE_ON) return false; try { return mService.startDiscovery(); } catch (RemoteException e) {Log.e(TAG, "", e);} return false; } /** * Cancel the current device discovery process. *

Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}. *

Because discovery is a heavyweight procedure for the Bluetooth * adapter, this method should always be called before attempting to connect * to a remote device with {@link * android.bluetooth.BluetoothSocket#connect()}. Discovery is not managed by * the Activity, but is run as a system service, so an application should * always call cancel discovery even if it did not directly request a * discovery, just to be sure. *

If Bluetooth state is not {@link #STATE_ON}, this API * will return false. After turning on Bluetooth, * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON} * to get the updated value. * * @return true on success, false on error */ public boolean cancelDiscovery() { if (getState() != STATE_ON) return false; try { mService.cancelDiscovery(); } catch (RemoteException e) {Log.e(TAG, "", e);} return false; } /** * Return true if the local Bluetooth adapter is currently in the device * discovery process. *

Device discovery is a heavyweight procedure. New connections to * remote Bluetooth devices should not be attempted while discovery is in * progress, and existing connections will experience limited bandwidth * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing * discovery. *

Applications can also register for {@link #ACTION_DISCOVERY_STARTED} * or {@link #ACTION_DISCOVERY_FINISHED} to be notified when discovery * starts or completes. *

If Bluetooth state is not {@link #STATE_ON}, this API * will return false. After turning on Bluetooth, * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON} * to get the updated value. *

Requires {@link android.Manifest.permission#BLUETOOTH}. * * @return true if discovering */ public boolean isDiscovering() { if (getState() != STATE_ON) return false; try { return mService.isDiscovering(); } catch (RemoteException e) {Log.e(TAG, "", e);} return false; } /** * Return the set of {@link BluetoothDevice} objects that are bonded * (paired) to the local adapter. *

If Bluetooth state is not {@link #STATE_ON}, this API * will return an empty set. After turning on Bluetooth, * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON} * to get the updated value. *

Requires {@link android.Manifest.permission#BLUETOOTH}. * * @return unmodifiable set of {@link BluetoothDevice}, or null on error */ public Set getBondedDevices() { if (getState() != STATE_ON) { return toDeviceSet(new String[0]); } try { return toDeviceSet(mService.listBonds()); } catch (RemoteException e) {Log.e(TAG, "", e);} return null; } /** * Picks RFCOMM channels until none are left. * Avoids reserved channels. */ private static class RfcommChannelPicker { private static final int[] RESERVED_RFCOMM_CHANNELS = new int[] { 1, // DUN 10, // HFAG 11, // HSAG 12, // OPUSH 16, // MAS0 17, // MAS1 19, // PBAP 20, // FTP }; private static LinkedList sChannels; // master list of non-reserved channels private static Random sRandom; private final LinkedList mChannels; // local list of channels left to try private final UUID mUuid; public RfcommChannelPicker(UUID uuid) { synchronized (RfcommChannelPicker.class) { if (sChannels == null) { // lazy initialization of non-reserved rfcomm channels sChannels = new LinkedList(); for (int i = 1; i <= BluetoothSocket.MAX_RFCOMM_CHANNEL; i++) { sChannels.addLast(new Integer(i)); } for (int reserved : RESERVED_RFCOMM_CHANNELS) { sChannels.remove(new Integer(reserved)); } sRandom = new Random(); } mChannels = (LinkedList)sChannels.clone(); } mUuid = uuid; } /* Returns next random channel, or -1 if we're out */ public int nextChannel() { if (mChannels.size() == 0) { return -1; } return mChannels.remove(sRandom.nextInt(mChannels.size())); } } /** * Create a listening, secure RFCOMM Bluetooth socket. *

A remote device connecting to this socket will be authenticated and * communication on this socket will be encrypted. *

Use this socket only if an authenticated socket link is possible. * Authentication refers to the authentication of the link key to * prevent man-in-the-middle type of attacks. * For example, for Bluetooth 2.1 devices, if any of the devices does not * have an input and output capability or just has the ability to * display a numeric key, a secure socket connection is not possible. * In such a case, use {#link listenUsingInsecureRfcommOn}. * For more details, refer to the Security Model section 5.2 (vol 3) of * Bluetooth Core Specification version 2.1 + EDR. *

Use {@link BluetoothServerSocket#accept} to retrieve incoming * connections from a listening {@link BluetoothServerSocket}. *

Valid RFCOMM channels are in range 1 to 30. *

Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} * @param channel RFCOMM channel to listen on * @return a listening RFCOMM BluetoothServerSocket * @throws IOException on error, for example Bluetooth not available, or * insufficient permissions, or channel in use. * @hide */ public BluetoothServerSocket listenUsingRfcommOn(int channel) throws IOException { BluetoothServerSocket socket = new BluetoothServerSocket( BluetoothSocket.TYPE_RFCOMM, true, true, channel); int errno = socket.mSocket.bindListen(); if (errno != 0) { try { socket.close(); } catch (IOException e) {} socket.mSocket.throwErrnoNative(errno); } return socket; } /** * Create a listening, secure L2Cap Bluetooth socket. *

A remote device connecting to this socket will be authenticated and * communication on this socket will be encrypted. *

Use {@link BluetoothServerSocket#accept} to retrieve incoming * connections from a listening {@link BluetoothServerSocket}. *

Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} * @param psm L2Cap psm to listen on * @return a listening L2Cap BluetoothServerSocket * @throws IOException on error, for example Bluetooth not available, or * insufficient permissions, or channel in use. * @hide */ public BluetoothServerSocket listenUsingL2capOn(int psm) throws IOException { BluetoothServerSocket socket = new BluetoothServerSocket( BluetoothSocket.TYPE_L2CAP, true, true, psm); int errno = socket.mSocket.bindListen(); if (errno != 0) { try { socket.close(); } catch (IOException e) {} socket.mSocket.throwErrnoNative(errno); } return socket; } /** * Create a listening, secure EL2Cap Bluetooth socket. *

A remote device connecting to this socket will be authenticated and * communication on this socket will be encrypted. *

Use {@link BluetoothServerSocket#accept} to retrieve incoming * connections from a listening {@link BluetoothServerSocket}. *

Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN} * @param psm L2Cap psm to listen on * @return a listening L2Cap BluetoothServerSocket * @throws IOException on error, for example Bluetooth not available, or * insufficient permissions, or channel in use. * @hide */ public BluetoothServerSocket listenUsingEl2capOn(int psm) throws IOException { BluetoothServerSocket socket = new BluetoothServerSocket( BluetoothSocket.TYPE_EL2CAP, true, true, psm); int errno = socket.mSocket.bindListen(); if (errno != 0) { try { socket.close(); } catch (IOException e) { // Intentionally ignoring (give close() a chance, but we're // going to be throwing up an exception regardless (below)). } socket.mSocket.throwErrnoNative(errno); } return socket; } /** * Create a listening, secure RFCOMM Bluetooth socket with Service Record. *

A remote device connecting to this socket will be authenticated and * communication on this socket will be encrypted. *

Use this socket only if an authenticated socket link is possible. * Authentication refers to the authentication of the link key to * prevent man-in-the-middle type of attacks. * For example, for Bluetooth 2.1 devices, if any of the devices does not * have an input and output capability or just has the ability to * display a numeric key, a secure socket connection is not possible. * In such a case, use {#link listenUsingInsecureRfcommWithServiceRecord}. * For more details, refer to the Security Model section 5.2 (vol 3) of * Bluetooth Core Specification version 2.1 + EDR. *

Use {@link BluetoothServerSocket#accept} to retrieve incoming * connections from a listening {@link BluetoothServerSocket}. *

The system will assign an unused RFCOMM channel to listen on. *

The system will also register a Service Discovery * Protocol (SDP) record with the local SDP server containing the specified * UUID, service name, and auto-assigned channel. Remote Bluetooth devices * can use the same UUID to query our SDP server and discover which channel * to connect to. This SDP record will be removed when this socket is * closed, or if this application closes unexpectedly. *

Use {@link BluetoothDevice#createRfcommSocketToServiceRecord} to * connect to this socket from another device using the same {@link UUID}. *

Requires {@link android.Manifest.permission#BLUETOOTH} * @param name service name for SDP record * @param uuid uuid for SDP record * @return a listening RFCOMM BluetoothServerSocket * @throws IOException on error, for example Bluetooth not available, or * insufficient permissions, or channel in use. */ public BluetoothServerSocket listenUsingRfcommWithServiceRecord(String name, UUID uuid) throws IOException { return createNewRfcommSocketAndRecord(name, uuid, true, true); } /** * Create a listening, insecure RFCOMM Bluetooth socket with Service Record. *

The link key will be unauthenticated i.e the communication is * vulnerable to Man In the Middle attacks. For Bluetooth 2.1 devices, * the link key will be encrypted, as encryption is mandartory. * For legacy devices (pre Bluetooth 2.1 devices) the link key will not * be encrypted. Use {@link #listenUsingRfcommWithServiceRecord}, if an * encrypted and authenticated communication channel is desired. *

Use {@link BluetoothServerSocket#accept} to retrieve incoming * connections from a listening {@link BluetoothServerSocket}. *

The system will assign an unused RFCOMM channel to listen on. *

The system will also register a Service Discovery * Protocol (SDP) record with the local SDP server containing the specified * UUID, service name, and auto-assigned channel. Remote Bluetooth devices * can use the same UUID to query our SDP server and discover which channel * to connect to. This SDP record will be removed when this socket is * closed, or if this application closes unexpectedly. *

Use {@link BluetoothDevice#createRfcommSocketToServiceRecord} to * connect to this socket from another device using the same {@link UUID}. *

Requires {@link android.Manifest.permission#BLUETOOTH} * @param name service name for SDP record * @param uuid uuid for SDP record * @return a listening RFCOMM BluetoothServerSocket * @throws IOException on error, for example Bluetooth not available, or * insufficient permissions, or channel in use. */ public BluetoothServerSocket listenUsingInsecureRfcommWithServiceRecord(String name, UUID uuid) throws IOException { return createNewRfcommSocketAndRecord(name, uuid, false, false); } private BluetoothServerSocket createNewRfcommSocketAndRecord(String name, UUID uuid, boolean auth, boolean encrypt) throws IOException { RfcommChannelPicker picker = new RfcommChannelPicker(uuid); BluetoothServerSocket socket; int channel; int errno; while (true) { channel = picker.nextChannel(); if (channel == -1) { throw new IOException("No available channels"); } socket = new BluetoothServerSocket( BluetoothSocket.TYPE_RFCOMM, auth, encrypt, channel); errno = socket.mSocket.bindListen(); if (errno == 0) { if (DBG) Log.d(TAG, "listening on RFCOMM channel " + channel); break; // success } else if (errno == BluetoothSocket.EADDRINUSE) { if (DBG) Log.d(TAG, "RFCOMM channel " + channel + " in use"); try { socket.close(); } catch (IOException e) {} continue; // try another channel } else { try { socket.close(); } catch (IOException e) {} socket.mSocket.throwErrnoNative(errno); // Exception as a result of bindListen() } } int handle = -1; try { handle = mService.addRfcommServiceRecord(name, new ParcelUuid(uuid), channel, new Binder()); } catch (RemoteException e) {Log.e(TAG, "", e);} if (handle == -1) { try { socket.close(); } catch (IOException e) {} throw new IOException("Not able to register SDP record for " + name); } socket.setCloseHandler(mHandler, handle); return socket; } /** * Construct an unencrypted, unauthenticated, RFCOMM server socket. * Call #accept to retrieve connections to this socket. * @return An RFCOMM BluetoothServerSocket * @throws IOException On error, for example Bluetooth not available, or * insufficient permissions. * @hide */ public BluetoothServerSocket listenUsingInsecureRfcommOn(int port) throws IOException { BluetoothServerSocket socket = new BluetoothServerSocket( BluetoothSocket.TYPE_RFCOMM, false, false, port); int errno = socket.mSocket.bindListen(); if (errno != 0) { try { socket.close(); } catch (IOException e) {} socket.mSocket.throwErrnoNative(errno); } return socket; } /** * Construct an unencrypted, unauthenticated, L2Cap server socket. * Call #accept to retrieve connections to this socket. * @param psm L2Cap psm to listen on * @return An L2Cap BluetoothServerSocket * @throws IOException On error, for example Bluetooth not available, or * insufficient permissions. * @hide */ public BluetoothServerSocket listenUsingInsecureL2capOn(int psm) throws IOException { BluetoothServerSocket socket = new BluetoothServerSocket( BluetoothSocket.TYPE_L2CAP, false, false, psm); int errno = socket.mSocket.bindListen(); if (errno != 0) { try { socket.close(); } catch (IOException e) {} socket.mSocket.throwErrnoNative(errno); } return socket; } /** * Construct an unencrypted, unauthenticated, EL2Cap server socket. * Call #accept to retrieve connections to this socket. * @param psm L2Cap psm to listen on * @return An L2Cap BluetoothServerSocket * @throws IOException On error, for example Bluetooth not available, or * insufficient permissions. * @hide */ public BluetoothServerSocket listenUsingInsecureEl2capOn(int psm) throws IOException { BluetoothServerSocket socket = new BluetoothServerSocket( BluetoothSocket.TYPE_EL2CAP, false, false, psm); int errno = socket.mSocket.bindListen(); if (errno != 0) { try { socket.close(); } catch (IOException e) { // Intentionally ignoring (give close() a chance, but we're // going to be throwing up an exception regardless (below)). } socket.mSocket.throwErrnoNative(errno); } return socket; } /** * Construct a SCO server socket. * Call #accept to retrieve connections to this socket. * @return A SCO BluetoothServerSocket * @throws IOException On error, for example Bluetooth not available, or * insufficient permissions. * @hide */ public static BluetoothServerSocket listenUsingScoOn() throws IOException { BluetoothServerSocket socket = new BluetoothServerSocket( BluetoothSocket.TYPE_SCO, false, false, -1); int errno = socket.mSocket.bindListen(); if (errno != 0) { try { socket.close(); } catch (IOException e) {} socket.mSocket.throwErrnoNative(errno); } return socket; } /** * Read the local Out of Band Pairing Data *

Requires {@link android.Manifest.permission#BLUETOOTH} * * @return Pair of Hash and Randomizer * * @hide */ public Pair readOutOfBandData() { if (getState() != STATE_ON) return null; try { byte[] hash; byte[] randomizer; byte[] ret = mService.readOutOfBandData(); if (ret == null || ret.length != 32) return null; hash = Arrays.copyOfRange(ret, 0, 16); randomizer = Arrays.copyOfRange(ret, 16, 32); if (DBG) { Log.d(TAG, "readOutOfBandData:" + Arrays.toString(hash) + ":" + Arrays.toString(randomizer)); } return new Pair(hash, randomizer); } catch (RemoteException e) {Log.e(TAG, "", e);} return null; } private Set toDeviceSet(String[] addresses) { Set devices = new HashSet(addresses.length); for (int i = 0; i < addresses.length; i++) { devices.add(getRemoteDevice(addresses[i])); } return Collections.unmodifiableSet(devices); } private Handler mHandler = new Handler() { public void handleMessage(Message msg) { /* handle socket closing */ int handle = msg.what; try { if (DBG) Log.d(TAG, "Removing service record " + Integer.toHexString(handle)); mService.removeServiceRecord(handle); } catch (RemoteException e) {Log.e(TAG, "", e);} } }; /** * Validate a Bluetooth address, such as "00:43:A8:23:10:F0" *

Alphabetic characters must be uppercase to be valid. * * @param address Bluetooth address as string * @return true if the address is valid, false otherwise */ public static boolean checkBluetoothAddress(String address) { if (address == null || address.length() != ADDRESS_LENGTH) { return false; } for (int i = 0; i < ADDRESS_LENGTH; i++) { char c = address.charAt(i); switch (i % 3) { case 0: case 1: if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'F')) { // hex character, OK break; } return false; case 2: if (c == ':') { break; // OK } return false; } } return true; } }