classic bluetooth and bluetooth low energy (BLE)
APIs
1.scan for other bluetooth devices,include BLE
2.Query the local bluetoth adapter for paired bluetooth devices
3.establish RFCOMM channels/sockets
4.connect to specified sockets on other devices
5.transfer data to and from other devices
6.communicate with BLE devices, such as proximity sensors,heart rate monitors,fitness devices,and so on
7.(BLE)act as a GATT client or a GATT server
permission
android.permission.BLUETOOTH
allows apps to connect to paired bluetooth devices ,normal level
android.permission.BLUETOOTH_ADMIN
allows apps to discover and pair bluetooth devices,normal level
android.permission.BLUETOOTH_PRIVILEGED
allows apps to pair blurtooth devices without use interaction ,and to allow or disallow phonebook access or message access,not for use by third-party apps
extras
BluetoothProfile.EXTRA_STATE (the current state of the profile)
BluetoothProfile.EXTRA_PERVIOUS_STATE (the previos state of the profile )
BluetoothDevice#EXTRA_DEVICE (the remote device,not state )
broadcast
ACTION_CONNECTION_STATE_CHANGED
intent used to broadcast the change in connection state of A2DP profile
A2DP:Advanced Audio Distribution Profile
bluetooth state (BluetoothProfile.EXTRA_STATE,BluetoothProfile.EXTRA_PERVIOUS_STATE)
BluetoothProfile.STATE_DISCONNECTED
BluetoothProfile.STATE_DISCONNECTING
BluetoothProfile.STATE_CONNECTING
BluetoothProfile.STATE_CONNECTED
ACTION_PLAYING_STATE_CHANGED
intent used to broadcast the change in the playing state of the A2DP profile
bluetooth state (BluetoothProfile.EXTRA_STATE,BluetoothProfile.EXTRA_PERVIOUS_STATE,ACTION_CONNECTION_STATE_CHANGED)
STATE_PLAYING (is streaming music)
STATE_NOT_PLAYING (is not stream music)
public methods
void finalize();
gc
BlurtoothA2DP
providers the public APIs to control the bluetooth A2DP profile
List<BluetoothDevice> getConnectedDevices()
return the set of devices which are in state STATE_CONNECTED
int getConnectionState(BludetoothDevice device)
get the currention state of the profile
List<BluetoothDevice> getDevicesMatchingConnectionStates(int[] state)
get a list of devices that match any of the given connection state
boolean isA2dpPlaying(BluetoothDevice device)
check id A2DP profile is streaming music
BluetoothAdapter
represents the local device bluetooth adapter
写了一个经典蓝牙,但是有一丢丢不稳定,就很烦
//主动连接端
private fun toConnect() {
try {
val socket = device.createInsecureRfcommSocketToServiceRecord(UUID.fromString(app_uuid))
Utils.siglePool.execute {
loopRead(socket!!)
}
} catch (e: Exception) {
closeBluetooth()
Log.w(MainApplication.TAG, "listerBroad: $e")
}
}
//被动接受端
private fun listerBroad() {
try {
val adapter = BluetoothAdapter.getDefaultAdapter()
socketServer = adapter.listenUsingRfcommWithServiceRecord(BT_NAME, UUID.fromString(app_uuid))
Utils.siglePool.execute {
val socket = socketServer?.accept()
socketServer?.close()//关闭监听,只连接一个设备
loopRead(socket!!)
}
} catch (e: Exception) {
closeBluetooth()
Log.w(TAG, "listerBroad: $e")
}
}
/**
* 读取消息
*/
fun loopRead(sk: BluetoothSocket) {
this.socket = sk
try {
if (!socket?.isConnected!!) {
socket?.connect()
}
val input = socket?.inputStream
outPut = socket?.outputStream
var count = 0
var already = 0
val readByte = ByteArray(24)
isRead = true
while (((input?.read(readByte)).also { count = it!! }) != -1) {
already += count
if (already >= input?.available()!!) {
lister?.getSocketDataForBluetooth(bytesToHexString(readByte)!!)
isRead = false
break
}
}
} catch (e: Exception) {
isRead = false
Log.w(TAG, "loopRead: ${e.toString()}")
}
}
/**
* 发送消息
*/
fun sendData(msg: String) {
if (isSend) {
Log.w(TAG, "sendData: 发送中")
return
}
isSend = true
try {
outPut?.write(hexStringToBytes(msg))
outPut?.flush()
} catch (e: java.lang.Exception) {
isSend = false
Log.w(TAG, "loopRead: ${e.toString()}")
lister?.finishSendData(false, msg)
}
lister?.finishSendData(true, msg)
}
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