添加权限：
<uses-permission Android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.BLUETOOTH"/>
- 客户端
开启蓝牙:
/**
* 打开蓝牙设备
*/
void openBT(){
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter!= null){
if (!mBluetoothAdapter.isEnabled()){
mBluetoothAdapter.enable();
Log.d("qfopenBT","打开蓝牙成功");
}
}
}
搜索蓝牙:
/**
* 搜索蓝牙设备
* @param view
*/
@OnClick(R.id.btSearch)
public void startSearch(View view){
if(mBluetoothAdapter!= null &&mBluetoothAdapter.isEnabled()){
if (!mBluetoothAdapter.isDiscovering()){
mBluetoothAdapter.startDiscovery();
}
}
}
开启搜索是异步操作，发现设备后会发送广播，所以要定义广播接收者
在接收到广播后，获取广播里的蓝牙数据
private class BTBroadCastRevextends BroadcastReceiver{
@Override
public void onReceive(Context context,Intent intent) {
String strAction = intent.getAction();
if (strAction.equals(BluetoothDevice.ACTION_FOUND)){
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
mArrDevice.add(device);
mAdapter.notifyDataSetChanged();
}
else if(strAction.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)){
Log.d("qfonReceive","搜索完成");
}
}
}
//注册广播接收者
myReceive = newBTBroadCastRev();
IntentFilter ifFind = new IntentFilter(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(myReceive,ifFind);
IntentFilter ifFinishFind = newIntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
this.registerReceiver(myReceive,ifFinishFind);
连接蓝牙，并开启发送数据线程：
/**
* 点击item，连接对应的蓝牙设备
*/
protected void connectBT() {
mLvDevice.setOnItemClickListener(newAdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent,View view, int position, longid) {
MyClientTask task = newMyClientTask();
task.execute(mArrDevice.get(position));
}
});
}
class MyClientTask extends AsyncTask<BluetoothDevice,Void,Void>{
@Override
protected VoiddoInBackground(BluetoothDevice... devices) {
BluetoothDevice device = devices[0];
try {
//使用安全连接，服务端也要一样使用安全连接，UUID也要跟服务器的监听UUID一致
BluetoothSocket socket = device.createRfcommSocketToServiceRecord(MY_UUID_SECURE);
socket.connect();
Log.d("qfdoInBackground_client","连接成功，开始发送数据");
byte[] btMsg =new String("Hello").getBytes();
socket.getOutputStream().write(btMsg,0,btMsg.length);
} catch(Exception e) {
e.printStackTrace();
}
return null;
}
}
uuid可以通过uuidgen生成，生成结果类似以下结构：
5D3D5E52-338A-47B8-9F10-27ADF89E204E
- 服务端
开启蓝牙，跟客户端一样
启动服务线程
new RevTask().execute();
class RevTask extendsAsyncTask<Void,Void,String>{
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
tvMsg.setText(s);
}
@Override
protected StringdoInBackground(Void... params) {
try {
Log.d("qfdoInBackground","开始监听");
//要跟客户端uuid一致
BluetoothServerSocket sevSocket =mBluetoothAdapter.listenUsingRfcommWithServiceRecord("blue_service",MY_UUID_SECURE);
BluetoothSocket socket = sevSocket.accept();
if(socket != null){
Log.d("qfdoInBackground","连接成功");
InputStream stream = socket.getInputStream();
byte[] btRead =new byte[1024];
int iLength = stream.read(btRead);
Log.d("qfdoInBackground","读取数据成功"+iLength);
String strMsg =new String(btRead,"utf-8");
Log.d("qfdoInBackground",strMsg);
return strMsg;
}
else{
Log.d("qfdoInBackground","失败");
}
} catch (IOException e) {
e.printStackTrace();
Log.d("qfdoInBackground","异常");
}
return null;
}
}
上述代码没有实现配对，对应经典蓝牙通信，最好先进行配对再连接，已经配对的蓝牙设备可以直接通过adapter获取到
//得到所有已经配对的蓝牙适配器对象
Set<BluetoothDevice> devices = adapter.getBondedDevices();
没有配对的蓝牙设备，可以在扫描设备的广播通知中判断：
if
(device.getBondState() != BluetoothDevice.BOND_BONDED) { ......
}
点击设备连接时，判断是否已经配对，如果已经配对，直接连接，如果没有配对，先配对：
- if (btDev.getBondState() == BluetoothDevice.BOND_NONE) {
- //利用反射方法调用BluetoothDevice.createBond(BluetoothDevice remoteDevice);
- Method createBondMethod = BluetoothDevice.class
- .getMethod("createBond");
- Log.d("BlueToothTestActivity", "开始配对");
- returnValue = (Boolean) createBondMethod.invoke(btDev);
- }else if(btDev.getBondState() == BluetoothDevice.BOND_BONDED){
- connect(btDev);
- }
配对结果也会通过广播传递结果信息：
- // 注册Receiver来获取蓝牙设备相关的结果
- IntentFilter intent = new IntentFilter();
- intent.addAction(BluetoothDevice.ACTION_FOUND);// 用BroadcastReceiver来取得搜索结果
- intent.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
- intent.addAction(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
- intent.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
- registerReceiver(searchDevices, intent);
- if(BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)){
- device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
- switch (device.getBondState()) {
- case BluetoothDevice.BOND_BONDING:
- Log.d("BlueToothTestActivity", "正在配对......");
- break;
- case BluetoothDevice.BOND_BONDED:
- Log.d("BlueToothTestActivity", "完成配对");
- connect(device);//连接设备
- break;
- case BluetoothDevice.BOND_NONE:
- Log.d("BlueToothTestActivity", "取消配对");
- default:
- break;
- }