在安卓上实现低功耗蓝牙(BLE),可以使用Android的Bluetooth Low Energy API。下面是一个简单的代码示例,演示如何在安卓设备上扫描和连接到BLE设备:
private BluetoothAdapter mBluetoothAdapter;
private BluetoothLeScanner mBluetoothLeScanner;
private BluetoothGatt mBluetoothGatt;
// 初始化蓝牙适配器
BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = bluetoothManager.getAdapter();
// 检查设备是否支持BLE
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
Toast.makeText(this, "BLE not supported", Toast.LENGTH_SHORT).show();
finish();
}
// 检查蓝牙是否已启用
if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
} else {
// 初始化BLE扫描器
mBluetoothLeScanner = mBluetoothAdapter.getBluetoothLeScanner();
}
ScanCallback mScanCallback = new ScanCallback() {
@Override
public void onScanResult(int callbackType, ScanResult result) {
// 处理扫描结果
}
@Override
public void onScanFailed(int errorCode) {
// 处理扫描失败
}
};
// 开始扫描BLE设备
mBluetoothLeScanner.startScan(mScanCallback);
BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
if (newState == BluetoothProfile.STATE_CONNECTED) {
// 连接成功
mBluetoothGatt.discoverServices();
} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
// 连接断开
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
// 服务发现成功,可以进行数据通信
} else {
// 服务发现失败
}
}
};
// 连接到BLE设备
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(deviceAddress);
mBluetoothGatt = device.connectGatt(this, false, mGattCallback);
这只是一个简单的示例,你可以根据你的具体需求进一步扩展和优化代码。请注意,BLE通信需要在主线程以外的线程中进行,以免阻塞主线程。