要使用安卓和低功耗蓝牙(BLE)进行通信,可以使用安卓的BluetoothGatt类和BluetoothGattCallback回调方法。下面是一个简单的代码示例,演示如何连接到BLE设备、发现服务、读取和写入特征等操作:
private BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
if (newState == BluetoothProfile.STATE_CONNECTED) {
// 连接成功
gatt.discoverServices();
} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
// 连接断开
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
// 发现服务
List services = gatt.getServices();
for (BluetoothGattService service : services) {
// 处理服务
}
}
@Override
public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
// 读取特征值
byte[] value = characteristic.getValue();
// 处理特征值
}
@Override
public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
// 写入特征值完成
}
};
BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
BluetoothAdapter bluetoothAdapter = bluetoothManager.getAdapter();
BluetoothDevice device = bluetoothAdapter.getRemoteDevice("设备地址");
BluetoothGatt gatt = device.connectGatt(this, false, mGattCallback);
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
// 发现服务成功
} else {
// 发现服务失败
}
}
BluetoothGattService service = gatt.getService(UUID.fromString("服务UUID"));
BluetoothGattCharacteristic characteristic = service.getCharacteristic(UUID.fromString("特征UUID"));
gatt.readCharacteristic(characteristic);
BluetoothGattService service = gatt.getService(UUID.fromString("服务UUID"));
BluetoothGattCharacteristic characteristic = service.getCharacteristic(UUID.fromString("特征UUID"));
characteristic.setValue("写入的数据");
gatt.writeCharacteristic(characteristic);
这只是一个基本的示例,实际应用中可能需要处理更多的回调方法和错误处理。同时,还可以使用其他的BLE库或框架来简化BLE通信的开发。