java - 正确的方法如何顺序连接到BluetoothGatt设备

我已经实现了蓝牙低功耗设备扫描逻辑，但是我在使用BluetoothGatt服务方面有些挣扎。我要做的是从我的Android手机顺序连接到每个ESP32设备，以便我可以接收数据，然后继续连接到下一个设备（并断开与前一个设备的连接）。因此ESP32和Android手机之间只有一个活动连接。 ESP32已经编程，因此如果Android手机使用BluetoothGatt连接到它，则它会发送数据（最大20个字节）。真正的难题是了解如何管理这些连接以正确关闭/释放资源。管理这些BluetoothGatt连接的正确/最简单方法是什么？当发送的数据为"end"时，我的实现基本上连接到新的设备Gatt服务。问题是，如果一个ESP32设备处于活动状态，则此方法有效。如果有更多设备处于活动状态，则将发生某些情况，并且不会从Gatt服务接收数据。这是我的实现的一部分（对不起，我无法再减小代码大小）：1）我使用BLE扫描仪发现新设备private Handler _leScanHandler = new Handler();private final BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) { final int newRSSI = rssi; _leScanHandler.post(new Runnable() { @Override public void run() { addDeviceToListOnLEScan(device, newRSSI); } }); }};2）并且被调用的方法基本上管理BluetoothGatt内容。public void addDeviceToListOnLEScan(BluetoothDevice device, int rssi) { // Gets only user defined devices boolean isUserDefinedDevice = _definedDevicesHashMap.containsKey(device.getAddress()); if (!isUserDefinedDevice) { return; } // Adds device and updates 'LastModifiedTime = Date(System.currentTimeMillis())' addOrUpdateDevice(device.getAddress(), _scannedDevices); // Called only once on each connect button press to enable gatt operations if (!_isInitialConnectionHasBeenMade) { _isDataSendingCompleteFromCurrentGatt = true; _isInitialConnectionHasBeenMade = true; } // Sequential BLE device connect/disconnect operations if (_isDataSendingCompleteFromCurrentGatt) { BluetoothGatt previousGatt = _definedDevicesHashMap(previousAddress); if (previousGatt != null) { previousGatt.disconnect(); // ? } BluetoothGatt nextGatt = _definedDevicesHashMap(nextAddress); if (/* Checks if 'nextAddress' is in _scannedDevices */ /* And whether device 'IsActive()' */) { if (nextGatt == null) { nextGatt = connectToDeviceGattService(nextGatt) } else { // Do something here ? } _isDataSendingCompleteFromCurrentGatt = false; } }}3）我正在使用的以下变量/类private boolean _isDataSendingCompleteFromCurrentGatt = false;private boolean _isInitialConnectionHasBeenMade = false;private HashMap<String, BluetoothGatt> _definedDevicesHashMap;_definedDevicesHashMap.put("ff:ff:9f:c8:c2:93", null);_definedDevicesHashMap.put("ff:ff:9f:c8:c4:91", null);...private HashMap<String, MyBLEDevice> _scannedDevices;public class MyBLEDevice{ private final int deviceInactivityTimeout = 10; private String MacAddress; private Date _lastModifiedDate; public boolean isDeviceActive() { // Just gets the time difference (DateNow - lastModified) / 1000 < 10s }}4）我用来连接设备的方法public BluetoothGatt connectToDeviceGattService(BluetoothGatt currentGatt, BluetoothDevice device, BluetoothGattCallback callback) { _bluetoothAdapter.cancelDiscovery(); if (currentGatt == null) { currentGatt = device.connectGatt(_activity, true, callback); } else { // Is anything here needed ? } return currentGatt;}5）BluetoothGatt回调private BluetoothGattCallback mGattCallback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { if (status == BluetoothGatt.GATT_SUCCESS && newState == BluetoothProfile.STATE_CONNECTED) { // Discover services ? } else if (status == BluetoothGatt.GATT_SUCCESS && newState == BluetoothProfile.STATE_DISCONNECTED) { // Do nothing ? } else if (status != BluetoothGatt.GATT_SUCCESS) { // Disconnect from current BluetoothGatt instance? // Also close the connection ? _isDataSendingCompleteFromCurrentGatt = true; } } @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { enableGattConfigurationCharacteristic(); } @Override public void onCharacteristicChanged(BluetoothGatt gatt, final BluetoothGattCharacteristic characteristic) { _gattServiceHandler.post(new Runnable() { @Override public void run() { handleMessage(Message.obtain(null, MSG_CHARACTERISTIC_CHANGE, characteristic)); } }); }};6）最后，用于从Gatt回调接收数据的处理程序private static final int MSG_CHARACTERISTIC_CHANGE = 0;private Handler _gattServiceHandler = new Handler();private void handleMessage(Message msg) { BluetoothGattCharacteristic characteristic; switch (msg.what) { case MSG_CHARACTERISTIC_CHANGE: { characteristic = (BluetoothGattCharacteristic) msg.obj; if (BLELogic.PROPERTY_NOTIFY_CHAR_UUID.equals(characteristic.getUuid())) { String notification = BluetoothExtension.getCharacteristicValue(characteristic); if (notification.equals("end")) { _isDataSendingCompleteFromCurrentGatt = true; } else { UpdateViewOnGattNotificationSent(notification); } } } default: return; }}在开始时，我想简化所有逻辑，但是看起来在使用BLE / Gatt服务连接时，这没有什么简单的。 最佳答案 这是您可能会感兴趣的Question and answer答案短：  要实现多个BLE连接，您必须存储多个  BluetoothGatt对象，并将这些对象用于不同的设备。至  存储BluetoothGatt的多个连接对象，可以使用Map     私有Map connectedDeviceMap; ............关于java - 正确的方法如何顺序连接到BluetoothGatt设备，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/56347923/