手机蓝牙串口助手是一个J2ME程序，可以运行在支持蓝牙和J2ME的手机上，通过蓝牙转串口模块的配合使用，可以在手机上控制串口设备，例如modem、LCD显示屏。
简单说，你不必太在意这个工具，是开发人员碰老销工具，用来让你手机与其他IT设备连接通讯用的。
当你电脑需要通过蓝牙控制 手机 打电话，发短信，用到的就是蓝牙串口（com）通道。你手机可以通过蓝牙关关电脑，也是用的蓝牙串口通道。
不用太在意，这些功能用笑游专门软件实现比较好，不需要在开发。
蓝牙串口助手是一款基于RFCOMM蓝牙串口服务的传输软件，通过该软件可以连州磨接行唯蓝牙串口模块进行通信，实现手机串口连接。类似计算机的串口助手，是电子工程师的开发利器
（1）实时模式：基本输入输出。发送字符串实时获取信息
（2）键盘模式：可以自定义9个按钮名称和内容，实现点击按钮即可发送相应内容
（3）命册带斗令行模式：可设定命令结束符，用于通信调试。
（1）发现和连接蓝牙串口模块
（2）接收和发送数据
（3）可选择ASCII码显示或者是HEX十六进制显示
（5）发送十六进制数据
（6）将串口接收到的数据保存成txt文件
初涉android的蓝牙 *** 作,按照固定MAC地址连接获取Device时，程序始终是异常终止，查了好多天代码都没查出原因。今天改了一下API版本，突然就成功连接了。总结之后发现果然是个坑爹之极的错误。
为了这种错误拼命查原因浪费大把时间是非常不值得的，但是问题不解决更是揪心。可惜我百度了那么多，都没基梁有给出确切原因。今天特此mark，希望后来者遇到这个问题的时候能轻松解决。
下面是我的连接过程，中间崩溃原因及解决办法。
1：用AT指令获得蓝牙串口的MAC地址，地址是简写的，按照常理猜测可得标准格式。
2：开一个String adress= "************" //MAC地址， String MY_UUID= "************"//UUID根据通信而定，网上都有。
3：取得本地Adapter用getDefaultAdapter()远程的则用getRemoteDevice(adress)； 之后便可用UUID开socket进行通信。
如果中途各种在getRemoteDevice处崩溃，大家可以查看一下当前的API版本，如果是2.1或以下版本的话，便能确定是API版本问题，只要换成2.2或者以上就都可以正常运行了~ 这么坑爹的错误的确很为难初学者。 唉·········· 为这种小trick浪费很多时间真是难过。
（另外有个重要地方，别忘了给manifest里面加以下两个蓝牙 *** 作权限哦局磨~）
<uses-permission android:name="android.permission.BLUETOOTH"></uses-permission>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"></uses-permission>
下面附上Android蓝牙 *** 作中用固定MAC地址传输信息的模板，通用搜索模式日后再补删模板：
private BluetoothAdapter mBluetoothAdapter = null
private BluetoothSocket btSocket = null
private OutputStream outStream = null
private InputStream inStream = null
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB") //这条是蓝牙串口通用的UUID，不要更改
private static String address = "00:12:02:22:06:61" // <==要连接的蓝牙设备MAC地址
/*获得通信线路过程*/
/*1:获搏腊运取本地BlueToothAdapter*/
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter()
if(mBluetoothAdapter == null)
{
Toast.makeText(this, "Bluetooth is not available.", Toast.LENGTH_LONG).show()
finish()
return
}
if(!mBluetoothAdapter.isEnabled())
{
Toast.makeText(this, "Please enable your Bluetooth and re-run this program.", Toast.LENGTH_LONG).show()
finish()
return
}
/*2:获取远程BlueToothDevice*/
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address)
if(mBluetoothAdapter == null)
{
Toast.makeText(this, "Can't get remote device.", Toast.LENGTH_LONG).show()
finish()
return
}
/*3:获得Socket*/
try {
btSocket = device.createRfcommSocketToServiceRecord(MY_UUID)
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Socket creation failed.", e)
}
/*4:取消discovered节省资源*/
mBluetoothAdapter.cancelDiscovery()
/*5:连接*/
try {
btSocket.connect()
Log.e(TAG, "ON RESUME: BT connection established, data transfer link open.")
} catch (IOException e) {
try {
btSocket.close()
} catch (IOException e2) {
Log .e(TAG,"ON RESUME: Unable to close socket during connection failure", e2)
}
}
/*此时可以通信了，放在任意函数中*/
/* try {
outStream = btSocket.getOutputStream()
inStream = btSocket.getInputStream() //可在TextView里显示
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Output stream creation failed.", e)
}
String message = "1"
byte[] msgBuffer = message.getBytes()
try {
outStream.write(msgBuffer)
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Exception during write.", e)
}
*/
通用搜索模式代码模板：
简洁简洁方式1 demo
作用： 用VerticalSeekBar控制一个 LED屏幕的亮暗。
直接上码咯~
package com.example.seed2
import android.app.Activity
import android.app.AlertDialog
import android.app.Dialog
import android.os.Bundle
import java.io.IOException
import java.io.InputStream
import java.io.OutputStream
import java.util.UUID
import android.bluetooth.BluetoothAdapter
import android.bluetooth.BluetoothDevice
import android.bluetooth.BluetoothSocket
import android.content.DialogInterface
import android.util.Log
import android.view.KeyEvent
import android.widget.Toast
public class MetalSeed extends Activity {
private static final String TAG = "BluetoothTest"
private BluetoothAdapter mBluetoothAdapter = null
private BluetoothSocket btSocket = null
private OutputStream outStream = null
private InputStream inStream = null
private VerticalSeekBar vskb = null
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB") //这条是蓝牙串口通用的UUID，不要更改
private static String address = "00:12:02:22:06:61" // <==要连接的蓝牙设备MAC地址
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState)
setContentView(R.layout.main)
this.vskb = (VerticalSeekBar)super.findViewById(R.id.mskb)
this.vskb.setOnSeekBarChangeListener(new OnSeekBarChangeListenerX())
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter()
if(mBluetoothAdapter == null)
{
Toast.makeText(this, "Bluetooth is not available.", Toast.LENGTH_LONG).show()
finish()
return
}
if(!mBluetoothAdapter.isEnabled())
{
Toast.makeText(this, "Please enable your Bluetooth and re-run this program.", Toast.LENGTH_LONG).show()
finish()
return
}
}
private class OnSeekBarChangeListenerX implements VerticalSeekBar.OnSeekBarChangeListener {
public void onProgressChanged(VerticalSeekBar seekBar, int progress, boolean fromUser) {
//Main.this.clue.setText(seekBar.getProgress())
/* String message
byte [] msgBuffer
try {
outStream = btSocket.getOutputStream()
} catch (IOException e) {
Log.e(TAG,"ON RESUME : Output Stream creation failed.", e)
}
message =Integer.toString( seekBar.getProgress() )
msgBuffer = message.getBytes()
try{
outStream.write(msgBuffer)
} catch (IOException e) {
Log.e (TAG, "ON RESUME : Exception during write.", e)
} */
}
public void onStartTrackingTouch(VerticalSeekBar seekBar) {
String message
byte [] msgBuffer
try {
outStream = btSocket.getOutputStream()
} catch (IOException e) {
Log.e(TAG,"ON RESUME : Output Stream creation failed.", e)
}
message =Integer.toString( seekBar.getProgress() )
msgBuffer = message.getBytes()
try{
outStream.write(msgBuffer)
} catch (IOException e) {
Log.e (TAG, "ON RESUME : Exception during write.", e)
}
}
public void onStopTrackingTouch(VerticalSeekBar seekBar) {
String message
byte [] msgBuffer
try {
outStream = btSocket.getOutputStream()
} catch (IOException e) {
Log.e(TAG,"ON RESUME : Output Stream creation failed.", e)
}
message =Integer.toString( seekBar.getProgress() )
msgBuffer = message.getBytes()
try{
outStream.write(msgBuffer)
} catch (IOException e) {
Log.e (TAG, "ON RESUME : Exception during write.", e)
}
}
}
@Override
public void onStart()
{
super.onStart()
}
@Override
public void onResume()
{
super.onResume()
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address)
try {
btSocket = device.createRfcommSocketToServiceRecord(MY_UUID)
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Socket creation failed.", e)
}
mBluetoothAdapter.cancelDiscovery()
try {
btSocket.connect()
Log.e(TAG, "ON RESUME: BT connection established, data transfer link open.")
} catch (IOException e) {
try {
btSocket.close()
} catch (IOException e2) {
Log .e(TAG,"ON RESUME: Unable to close socket during connection failure", e2)
}
}
// Create a data stream so we can talk to server.
/* try {
outStream = btSocket.getOutputStream()
inStream = btSocket.getInputStream()
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Output stream creation failed.", e)
}
String message = "read"
byte[] msgBuffer = message.getBytes()
try {
outStream.write(msgBuffer)
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Exception during write.", e)
}
int ret = -1
while( ret != -1)
{
try {
ret = inStream.read()
} catch (IOException e)
{
e.printStackTrace()
}
}
*/
}
@Override
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