实现一个包含发现和连接到 BLE 设备、发送和接收数据并验证收到数据的 Android BLE 应用程序，可以使用以下示例代码：

1. 定义一个 BLE 回调类，以接收连接状态更改和数据接收事件：

public class BleCallback extends BluetoothGattCallback { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { // 处理连接状态更改事件 }

@Override
public void onCharacteristicChanged(BluetoothGatt gatt,
        BluetoothGattCharacteristic characteristic) {
    // 处理数据接收事件
}

}

2. 扫描和连接到设备：

private BluetoothAdapter mBluetoothAdapter; private BleCallback mBleCallback; private BluetoothGatt mGatt;

// 初始化 BLE 适配器和回调 mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); mBleCallback = new BleCallback();

// 开始扫描 mBluetoothAdapter.startLeScan(new UUID[]{UUID.fromString("0000180D-0000-1000-8000-00805F9B34FB")}, new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, final int rssi, final byte[] scanRecord) { // 连接到设备 if (device.getName() != null && device.getName().equals("MyDevice")) { mGatt = device.connectGatt(context, false, mBleCallback); } } });

3. 发送数据：

// 获取要发送的数据 byte[] dataToSend = "Hello, BLE world!".getBytes(Charset.forName("UTF-8"));

// 获取支持写入的特征 BluetoothGattCharacteristic characteristic = mGatt.getService(UUID.fromString("0000180D-0000-1000-8000-00805F9B34FB")) .getCharacteristic(UUID.fromString("00002A37-0000-1000-8000-00805F9B34FB"));

// 写入数据 characteristic.setValue(dataToSend); boolean success = mGatt.writeCharacteristic(characteristic);

4. 验证收