android - Android 上的低功耗蓝牙 : Get event when RSSI changes

Question

我可以通过 startLeScan 或通过新的 getBluetoothLeScanner 扫描蓝牙 LE 设备并且工作正常。然而，即使它一直在扫描，它也永远不会检测到同一个设备两次。这很不幸，因为我想在信标的 rssi 发生变化时接收事件。 Android 支持吗？

Answer 1

实现 BluetoothGattCallback 并覆盖 onReadRemoteRssi 方法。

private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            String intentAction;
            if (newState == BluetoothProfile.STATE_CONNECTED) {
                broadcastUpdate(intentAction);

            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                broadcastUpdate(intentAction);
            }
        }

        @Override
        public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) {
            super.onReadRemoteRssi(gatt, rssi, status);
            // use rssi value here
        }

        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status) {
            if (status == BluetoothGatt.GATT_SUCCESS) {
                broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
            } else {
                Log.w(TAG, "onServicesDiscovered received: " + status);
            }
        }

        @Override
        public void onCharacteristicRead(BluetoothGatt gatt,
                                         BluetoothGattCharacteristic characteristic,
                                         int status) {
            if (status == BluetoothGatt.GATT_SUCCESS) {
                broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
            }
        }

        @Override
        public void onCharacteristicChanged(BluetoothGatt gatt,
                                            BluetoothGattCharacteristic characteristic) {
            broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
        }
    };