BluetoothAdapter ；BluetoothDevice；BluetoothSocket;BluetoothServerSocket;UUID和String转换；
1.BluetoothAdapter 顾名思义，蓝牙适配器，直到我们建立bluetoothSocket连接之前，都要不断操作它
BluetoothAdapter里的方法很多，常用的有以下几个：
| boolean //取消可见 | cancelDiscovery()
Cancel the current device discovery process.
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| boolean //判断蓝牙地址是否有效 | checkBluetoothAddress(String address)
Validate a String Bluetooth address, such as "00:43:A8:23:10:F0"
Alphabetic characters must be uppercase to be valid. |
| void | closeProfileProxy(int profile, BluetoothProfile proxy)
Close the connection of the profile proxy to the Service.
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| boolean //关闭蓝牙 | disable()
Turn off the local Bluetooth adapter—do not use without explicit user action to turn off Bluetooth.
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| boolean //打开蓝牙 | enable()
Turn on the local Bluetooth adapter—do not use without explicit user action to turn on Bluetooth.
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| String //得到本地蓝牙地址 | getAddress()
Returns the hardware address of the local Bluetooth adapter.
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| Set //得到已经配对蓝牙 |
getBondedDevices()
Return the set of
BluetoothDevice objects that are bonded (paired) to the local adapter.
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| synchronized static BluetoothAdapter //获取默认BluetoothAdapter，实际上，也只有这一种方法获取BluetoothAdapter |
getDefaultAdapter()
Get a handle to the default local Bluetooth adapter.
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| String //得到本地蓝牙name | getName()
Get the friendly Bluetooth name of the local Bluetooth adapter.
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| int //得到当前连接的状态 | getProfileConnectionState(int profile)
Get the current connection state of a profile.
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| boolean | getProfileProxy(Context context, BluetoothProfile.ServiceListener listener, int profile)
Get the profile proxy object associated with the profile.
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| BluetoothDevice//通过address得device | getRemoteDevice(String address)
Get a
BluetoothDevice object for the given Bluetooth hardware address.
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| BluetoothDevice | getRemoteDevice(byte[] address)
Get a
BluetoothDevice object for the given Bluetooth hardware address.
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| int | getScanMode()
Get the current Bluetooth scan mode of the local Bluetooth adapter.
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| int //得到当前蓝牙适配器的状态 | getState()
Get the current state of the local Bluetooth adapter.
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| boolean //是否正在查找 | isDiscovering()
Return true if the local Bluetooth adapter is currently in the device discovery process.
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| boolean //当前是否可用 | isEnabled()
Return true if Bluetooth is currently enabled and ready for use.
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| BluetoothServerSocket //通过bluetoothAdapter创建bluetoothsocket （不安全） |
listenUsingInsecureRfcommWithServiceRecord(String name, UUID uuid)
Create a listening, insecure RFCOMM Bluetooth socket with Service Record.
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| BluetoothServerSocket //通过bluetoothAdapter创建bluetoothsocket （不安全） |
listenUsingRfcommWithServiceRecord(String name, UUID uuid)
Create a listening, secure RFCOMM Bluetooth socket with Service Record.
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| boolean //设置本地蓝牙的name | setName(String name)
Set the friendly Bluetooth name of the local Bluetooth adapter.
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| boolean | startDiscovery()
Start the remote device discovery process.
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listenUsingRfcommWithServiceRecord(String name,UUID uuid)根据名称，UUID创建并返回BluetoothServerSocket，这是创建BluetoothSocket服务器端的第一步
startDiscovery()开始搜索，这是搜索的第一步
2.BluetoothDevice看名字就知道，这个类描述了一个蓝牙设备
| BluetoothSocket //通过根据UUID创建并返回一个BluetoothSocket |
createInsecureRfcommSocketToServiceRecord(UUID uuid)
Create an RFCOMM
BluetoothSocket socket ready to start an insecure outgoing connection to this remote device using SDP lookup of uuid.
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| BluetoothSocket | createRfcommSocketToServiceRecord(UUID uuid)
Create an RFCOMM
BluetoothSocket ready to start a secure outgoing connection to this remote device using SDP lookup of uuid.
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| int | describeContents()
Describe the kinds of special objects contained in this Parcelable's marshalled representation.
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| boolean | equals(Object o)
Compares this instance with the specified object and indicates if they are equal.
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| boolean | fetchUuidsWithSdp()
Perform a service discovery on the remote device to get the UUIDs supported.
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| String //得到远程设备的地址 | getAddress()
Returns the hardware address of this BluetoothDevice.
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| BluetoothClass | getBluetoothClass()
Get the Bluetooth class of the remote device.
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| int //得到远程设备的状态 | getBondState()
Get the bond state of the remote device.
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| String 得到远程设备的name | getName()
Get the friendly Bluetooth name of the remote device.
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| ParcelUuid[] 得到远程设备的uuids | getUuids()
Returns the supported features (UUIDs) of the remote device.
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| int | hashCode()
Returns an integer hash code for this object.
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| String | toString()
Returns a string representation of this BluetoothDevice.
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| void | writeToParcel(Parcel out, int flags)
Flatten this object in to a Parcel.
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这个方法也是我们获取BluetoothDevice的目的——创建BluetoothSocket
这个类其他的方法，如getAddress(),getName(),同BluetoothAdapter
3.BluetoothServerSocket如果去除了Bluetooth相信大家一定再熟悉不过了，既然是Socket，方法就应该都差不多
| BluetoothSocket | accept(int timeout)
Block until a connection is established, with timeout.
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| BluetoothSocket | accept()
Block until a connection is established.
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| void | close()
Immediately close this socket, and release all associated resources.
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两个重载的accept(),accept(inttimeout)两者的区别在于后面的方法指定了过时时间，需要注意的是，执行这两个方法的时候，直到接收到了客户端的请求（或是过期之后），都会阻塞线程，应该放在新线程里运行！
4.BluetoothSocket
| void | close()
Closes the object and release any system resources it holds.
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| void | connect()
Attempt to connect to a remote device.
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| InputStream | getInputStream()
Get the input stream associated with this socket.
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| OutputStream | getOutputStream()
Get the output stream associated with this socket.
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| BluetoothDevice | getRemoteDevice()
Get the remote device this socket is connecting, or connected, to.
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| boolean | isConnected()
Get the connection status of this socket, ie, whether there is an active connection with remote device.
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5.UUID和String之间的转化：
uuid->String:
String s = UUID.randomUUID().toString();
String->uuid:
UUID.fromString(name)