仅使用蓝牙低功耗(BLE)的设备之间的通信涉及几个关键步骤,包括设备发现、连接建立、服务和特征配置以及数据交换。以下是一个基本的指南:
以下是一个简单的示例,展示如何在Android设备上使用BLE进行通信:
在AndroidManifest.xml
中添加BLE权限:
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-feature android:name="android.hardware.bluetooth_le" android:required="true"/>
BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
BluetoothAdapter bluetoothAdapter = bluetoothManager.getAdapter();
BluetoothAdapter.LeScanCallback leScanCallback = new BluetoothAdapter.LeScanCallback() {
@Override
public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) {
// 处理发现的设备
}
};
bluetoothAdapter.startLeScan(leScanCallback);
BluetoothDevice device = bluetoothAdapter.getRemoteDevice(deviceAddress);
BluetoothGatt gatt = device.connectGatt(context, 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) {
// 发现服务后,可以获取服务和特征
BluetoothService service = gatt.getService(serviceUUID);
BluetoothCharacteristic characteristic = service.getCharacteristic(characteristicUUID);
}
@Override
public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothCharacteristic characteristic) {
// 处理特征值变化通知
}
};
BluetoothService service = gatt.getService(serviceUUID);
BluetoothCharacteristic characteristic = service.getCharacteristic(characteristicUUID);
// 读取特征值
gatt.readCharacteristic(characteristic);
// 写入特征值
characteristic.setValue(newValue);
gatt.writeCharacteristic(characteristic);
通过以上步骤,你可以实现仅使用BLE的设备之间的通信。根据具体需求,你可能需要进一步调整和优化代码。
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