android监听蓝牙

要在Android应用程序中监听蓝牙，可以使用BluetoothAdapter类和BroadcastReceiver类。首先，需要获取BluetoothAdapter实例并使用registerReceiver()方法注册BroadcastReceiver来监听BluetoothAdapter.ACTION_STATE_CHANGED和BluetoothDevice.ACTION_FOUND事件。在BroadcastReceiver的onReceive()方法中，可以处理蓝牙状态变化和发现新设备的事件。以下是一个简单的示例代码：

// 获取BluetoothAdapter实例
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

// 注册BroadcastReceiver监听蓝牙状态变化和新设备发现事件
IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
filter.addAction(BluetoothDevice.ACTION_FOUND);
registerReceiver(bluetoothReceiver, filter);

// BroadcastReceiver处理蓝牙事件
private final BroadcastReceiver bluetoothReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)) {
            final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
            switch (state) {
                case BluetoothAdapter.STATE_OFF:
                    // 蓝牙关闭
                    break;
                case BluetoothAdapter.STATE_TURNING_OFF:
                    // 蓝牙正在关闭
                    break;
                case BluetoothAdapter.STATE_ON:
                    // 蓝牙打开
                    break;
                case BluetoothAdapter.STATE_TURNING_ON:
                    // 蓝牙正在打开
                    break;
            }
        } else if (BluetoothDevice.ACTION_FOUND.equals(action)) {
            // 发现新设备
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            String deviceName = device.getName();
            String deviceHardwareAddress = device.getAddress();
        }
    }
};