在Android中使用BLE(蓝牙低功耗)进行写入操作时,通常会涉及到以下几个步骤:
下面是一个简单的示例,展示了如何在Android中进行BLE写入操作并处理写入响应。
首先,你需要连接到BLE设备。这通常通过BluetoothGatt
类来完成。
BluetoothDevice device = bluetoothAdapter.getRemoteDevice(deviceAddress);
BluetoothGatt gatt = device.connectGatt(context, false, gattCallback);
连接成功后,你需要发现设备的服务和特征。
private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
if (newState == BluetoothProfile.STATE_CONNECTED) {
gatt.discoverServices();
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
// 服务发现成功,可以获取服务和特征
BluetoothService service = gatt.getService(serviceUUID);
BluetoothCharacteristic characteristic = service.getCharacteristic(characteristicUUID);
}
};
发现服务和特征后,你可以向特征写入数据。
byte[] data = new byte[]{0x01, 0x02, 0x03}; // 示例数据
characteristic.setValue(data);
gatt.writeCharacteristic(characteristic);
写入数据后,你需要处理写入响应。这通常通过BluetoothGattCallback
的onCharacteristicWrite
方法来完成。
private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
@Override
public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothCharacteristic characteristic, int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
// 写入成功
Log.d(TAG, "Write successful");
} else {
// 写入失败
Log.e(TAG, "Write failed with status: " + status);
}
}
};
以下是一个完整的示例,展示了如何在Android中进行BLE写入操作并处理写入响应。
public class BleActivity extends AppCompatActivity {
private BluetoothAdapter bluetoothAdapter;
private BluetoothGatt gatt;
private static final String TAG = "BleActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ble);
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null || !bluetoothAdapter.isEnabled()) {
// 处理蓝牙不可用或未启用的情况
return;
}
String deviceAddress = "YOUR_DEVICE_ADDRESS";
BluetoothDevice device = bluetoothAdapter.getRemoteDevice(deviceAddress);
gatt = device.connectGatt(this, false, gattCallback);
}
private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
if (newState == BluetoothProfile.STATE_CONNECTED) {
gatt.discoverServices();
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
BluetoothService service = gatt.getService(serviceUUID);
BluetoothCharacteristic characteristic = service.getCharacteristic(characteristicUUID);
byte[] data = new byte[]{0x01, 0.02, 0x03}; // 示例数据
characteristic.setValue(data);
gatt.writeCharacteristic(characteristic);
}
@Override
public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothCharacteristic characteristic, int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
Log.d(TAG, "Write successful");
} else {
Log.e(TAG, "Write failed with status: " + status);
}
}
};
}
在这个示例中,我们展示了如何连接到BLE设备,发现服务和特征,写入数据,并处理写入响应。请根据你的具体需求进行调整。