Ble蓝牙API

Ble蓝牙API

1.获取蓝牙管理器

• BluetoothManager buetoothManage = getSystemService(Context.BLUETOOTH_SERVICE);

2.获取蓝牙适配器

• BlueToothAdapter bluetoothAdapter = bluetoothManager.getAdapter();

3.获取蓝牙扫描器

• bleScanner = bluetoothAdapter.getBluetoothLeScanner();
• bleScanner.startScan(scanCallback);

// BLE扫描回调
    private final ScanCallback scanCallback = new ScanCallback() {
        @Override
        public void onScanResult(int callbackType, ScanResult result) {
            super.onScanResult(callbackType, result);
            
            BluetoothDevice device = result.getDevice();
            String deviceName = device.getName();
            
            // 过滤设备名称
            if (deviceName != null && deviceName.contains(DEVICE_NAME_FILTER) && 
                !deviceList.contains(device)) {
                
                deviceList.add(device);
                devicesAdapter.add(device.getName() + "\n" + device.getAddress());
            }
        }
        
        @Override
        public void onScanFailed(int errorCode) {
            super.onScanFailed(errorCode);
            statusText.setText("扫描失败: " + errorCode);
            scanning = false;
            btnScan.setText("扫描设备");
        }
    };

4.连接设备

   BluetoothGatt   bluetoothGatt ;
    private void connectDevice() {
        bluetoothGatt = selectedDevice.connectGatt(this, false, gattCallback);
    }

private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
        /// 监听蓝牙连接
        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            super.onConnectionStateChange(gatt, status, newState);
            if (newState == BluetoothGatt.STATE_CONNECTED) {
                runOnUiThread(() -> {
                    statusText.setText("已连接，发现服务中...");
                });

            } else if (newState == BluetoothGatt.STATE_DISCONNECTED) {
                runOnUiThread(() -> {
                    statusText.setText("已断开连接");

                });
            }
        }

        /// 发现BluetoothGatt服务
        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status) {
            super.onServicesDiscovered(gatt, status);
             List<BluetoothGattService> gattServices =gatt.getServices();
            BluetoothGattCharacteristic charData = bluetoothGatt.getService(SERVICE_UUID).getCharacteristic(DATA_UUID);
            BluetoothGattCharacteristic charHeartbeat = bluetoothGatt.getService(SERVICE_UUID).getCharacteristic(HEARTBEAT_UUID);
            //设置开启特性监听，这样onCharacteristicChanged才会有回调数据
            bluetoothGatt.setCharacteristicNotification(charData, true);
            bluetoothGatt.setCharacteristicNotification(charHeartbeat, true);

        }
        /// 特性变化时，收到通知
        @Override
        public void onCharacteristicChanged(
                BluetoothGatt gatt,
                BluetoothGattCharacteristic characteristic
        ) {
            super.onCharacteristicChanged(gatt, characteristic);
            // 这里处理从BLE设备接收到的数据
            byte[] data = characteristic.getValue();
            if (data != null && data.length > 0) {
                String receivedData = new String(data, StandardCharsets.UTF_8);

                // 在主线程更新UI
                runOnUiThread(() -> {
                    //parseAndDisplayData(receivedData);
                });
            }
        }
    };