1.权限 
使用蓝牙设备需要先在Manifest中开放权限,位置如下。 
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<application ...> 
       ... 
</application> 
 
// 使用蓝牙设备的权限 
<uses-permission android:name="android.permission.BLUETOOTH" /> 
// 管理蓝牙设备的权限 
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

 

2.打开蓝牙 
获得蓝牙适配器(android.bluetooth.BluetoothAdapter),检查该设备是否支持蓝牙,如果支持,就打开蓝牙。 
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// 检查设备是否支持蓝牙 
adapter = BluetoothAdapter.getDefaultAdapter(); 
if (adapter == null) 
{

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// 设备不支持蓝牙


// 打开蓝牙 
if (!adapter.isEnabled()) 
{

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Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); 
// 设置蓝牙可见性,最多300秒 
intent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300); 
context.startActivity(intent);

}

3.获取已配对的蓝牙设备(android.bluetooth.BluetoothDevice) 
首次连接某蓝牙设备需要先配对,一旦配对成功,该设备的信息会被保存,以后连接时无需再配对,所以已配对的设备不一定是能连接的。 
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BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter(); 
Set devices = adapter.getBondedDevices(); 
for(int i=0; i {

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BluetoothDevice device = (BluetoothDevice) devices.iterator().next(); 
System.out.println(device.getName());

}

4.搜索周围的蓝牙设备 
适配器搜索蓝牙设备后将结果以广播形式传出去,所以需要自定义一个继承广播的类,在onReceive方法中获得并处理蓝牙设备的搜索结果。 
[java] view plaincopy 
// 设置广播信息过滤 
IntentFilter intentFilter = new IntentFilter(); 
intentFilter.addAction(BluetoothDevice.ACTION_FOUND); 
intentFilter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED); 
intentFilter.addAction(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED); 
intentFilter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED); 
// 注册广播接收器,接收并处理搜索结果 
context.registerReceiver(receiver, intentFilter); 
// 寻找蓝牙设备,android会将查找到的设备以广播形式发出去 
adapter.startDiscovery();

自定义广播类 
[java] view plaincopy 
private BroadcastReceiver receiver = new BroadcastReceiver() { 
@Override 
public void onReceive(Context context, Intent intent) {

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String action = intent.getAction(); 
    if (BluetoothDevice.ACTION_FOUND.equals(action)) { 
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); 
        System.out.println(device.getName()); 
    }


}

5.蓝牙设备的配对和状态监视 
[java] view plaincopy 
private BroadcastReceiver receiver = new BroadcastReceiver() {

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@Override 
public void onReceive(Context context, Intent intent) { 
    String action = intent.getAction(); 
    if (BluetoothDevice.ACTION_FOUND.equals(action)) { 
        // 获取查找到的蓝牙设备 
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); 
        System.out.println(device.getName()); 
        // 如果查找到的设备符合要连接的设备,处理 
        if (device.getName().equalsIgnoreCase(name)) { 
            // 搜索蓝牙设备的过程占用资源比较多,一旦找到需要连接的设备后需要及时关闭搜索 
            adapter.cancelDiscovery(); 
            // 获取蓝牙设备的连接状态 
            connectState = device.getBondState(); 
            switch (connectState) { 
                // 未配对 
                case BluetoothDevice.BOND_NONE: 
                    // 配对 
                    try
                        Method createBondMethod = BluetoothDevice.class.getMethod("createBond"); 
                        createBondMethod.invoke(device); 
                    catch (Exception e) {  
                        e.printStackTrace(); 
                    
                    break
                // 已配对 
                case BluetoothDevice.BOND_BONDED: 
                    try
                        // 连接 
                        connect(device); 
                    catch (IOException e) { 
                        e.printStackTrace(); 
                    
                    break
            
        
   else if(BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) { 
        // 状态改变的广播 
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); 
        if (device.getName().equalsIgnoreCase(name)) {  
            connectState = device.getBondState(); 
            switch (connectState) { 
                case BluetoothDevice.BOND_NONE: 
                    break
                case BluetoothDevice.BOND_BONDING: 
                    break
                case BluetoothDevice.BOND_BONDED: 
                    try
                        // 连接 
                        connect(device); 
                    catch (IOException e) { 
                        e.printStackTrace(); 
                    
                    break
            
        
    
}

}

6.蓝牙设备的连接 
[java] view plaincopy 
private void connect(BluetoothDevice device) throws IOException {

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// 固定的UUID 
final String SPP_UUID = "00001101-0000-1000-8000-00805F9B34FB"
UUID uuid = UUID.fromString(SPP_UUID); 
BluetoothSocket socket = device.createRfcommSocketToServiceRecord(uuid); 
socket.connect();

}

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