android 蓝牙广播协议,android 蓝牙SPP协议通信
准备
1.蓝牙串行端口基于SPP协议(Serial Port Profile)，能在蓝牙设备之间创建串口进行数据传输
2.SPP的UUID：00001101-0000-1000-8000-00805F9B34FB
3.Android手机一般以客户端的角色主动连接SPP协议设备
连接流程
1.检测蓝牙状态
若蓝牙未打开，则打开蓝牙~bluetoothAdapter =BluetoothAdapter.getDefaultAdapter();
@Overrideprotected voidonResume() {super.onResume();if (!bluetoothAdapter.isEnabled()) {//open blueTooth
Intent enableBtIntent = newIntent( BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
}
@Overrideprotected void onActivityResult(int requestCode, intresultCode, Intent data) {if (requestCode == REQUEST_ENABLE_BT && resultCode ==Activity.RESULT_CANCELED) {
finish();return;
}
}
2.注册设备搜索广播信息
使用registerReceiver注册broadcastReceiver来获取搜索设备等消息IntentFilter intentFilter = newIntentFilter();
intentFilter.addAction(BluetoothDevice.ACTION_FOUND);
intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(receiver, intentFilter);//receiver
private final BroadcastReceiver receiver = newBroadcastReceiver(){
@Overridepublic voidonReceive(Context context, Intent intent) {
String action=intent.getAction();if(BluetoothDevice.ACTION_FOUND.equals(action)) {//find a device
BluetoothDevice device =intent .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);if (device.getBondState() !=BluetoothDevice.BOND_BONDED) {//未配对设备
newDeviceArrayAdapter.add(device.getName() + "\n" +device.getAddress());
}else{//已经配对过的设备
TextView tvPaired =(TextView)findViewById(R.id.tv_paired);
tvPaired.setVisibility(View.VISIBLE);
lvPairedDevices.setVisibility(View.VISIBLE);
pairedDeviceArrayAdapter.add(device.getName()+ "\n" +device.getAddress());
}
Log.i(TAG,"name:" + device.getName() + " address"+device.getAddress());
}else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action){//search finish
Log.i(TAG, "search finish!");
}
}
};
3.使用BlueAdatper搜索
使用bluetoothAdapter搜索设备，bluetoothAdapter.startDiscovery()在搜索过程中，系统会发出三个广播信息:
ACTION_DISCOVERY_START：开始搜索
ACTION_DISCOVERY_FINISHED：搜索结束
ACTION_FOUND：找到设备@Overridepublic voidonClick(View v) {if(bluetoothAdapter.isDiscovering()) {
bluetoothAdapter.cancelDiscovery();
}
bluetoothAdapter.startDiscovery();
}
4.获取搜索到的蓝牙设备信息
在BroadcastReceiver的onReceive()里取得搜索到的蓝牙设备信息(如名称，MAC，RSSI)
5.通过蓝牙设备的MAC地址来建立一个BluetoothDevice对象：BluetoothDevice romoteDevice = bluetoothAdapter.getRemoteDevice(mDeviceAddress);
6.由BluetoothDevice衍生BluetoothSocket
通过BluetoothSocket的createRfcommSocketToServiceRecord()方法来选择连接的协议/服务，这里用的是SPP(UUID:00001101-0000-1000-8000-00805F9B34FB)try{
bluetoothSocket=romoteDevice.createRfcommSocketToServiceRecord(UUID.fromString(SPP_UUID));
}catch(IOException e) {
e.printStackTrace();
Toast.makeText(this, "socket init failed", Toast.LENGTH_SHORT).show();
}
7.使用BluetoothSocket来连接、读写蓝牙设备
读写可以归到一个独立线程去实现~try{
bluetoothSocket.connect();
Toast.makeText(this, "connect success", Toast.LENGTH_SHORT).show();
}catch(IOException e2) {
e2.printStackTrace();
Toast.makeText(this, "connect failed", Toast.LENGTH_SHORT).show();try{
bluetoothSocket.close();
bluetoothSocket= null;
}catch(IOException e) {
e.printStackTrace();
Toast.makeText(this, "socket close failed", Toast.LENGTH_SHORT).show();
}return;
}try{
inputStream=bluetoothSocket.getInputStream();
}catch(IOException e2) {
e2.printStackTrace();
Toast.makeText(this, "get inputstream failed", Toast.LENGTH_SHORT).show();return;
}try{
OutputStream os=bluetoothSocket.getOutputStream();byte[] osBytes =etInput.getText().toString().getBytes();for (int i = 0; i < osBytes.length; i++) {if (osBytes[i] == 0x0a)
n++;
}byte[] osBytesNew = new byte[osBytes.length+n];
n= 0;for (int i = 0; i < osBytesNew.length; i++) {//mobile "\n"is 0a,modify 0d 0a then send
if (osBytesNew[i] == 0x0a) {
osBytesNew[n]= 0x0d;
n++;
osBytesNew[n]= 0x0a;
}else{
osBytesNew[n]=osBytes[i];
}
n++;
}
os.write(osBytesNew);
}catch(Exception e) {
e.printStackTrace();
}
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