android ble rssi

时间: 2023-07-22 17:43:05 浏览: 34
您的问题是关于Android BLE的RSSI。RSSI是接收信号强度指示器的缩写,它可以用来衡量BLE设备之间的信号强度。在Android BLE编程中,您可以通过实现BLE扫描回调函数并在回调函数中处理RSSI数据来获取RSSI值。以下是一个示例代码片段,演示如何在Android BLE中获取RSSI值: ``` private final ScanCallback mScanCallback = new ScanCallback() { @Override public void onScanResult(int callbackType, ScanResult result) { BluetoothDevice device = result.getDevice(); int rssi = result.getRssi(); // 获取RSSI值 // 处理设备和RSSI值 } }; ``` 在上面的代码中,`result.getRssi()`方法返回设备的RSSI值。您可以将此值用于跟踪设备之间的信号强度,以确定它们之间的距离或是否接近了。希望这可以帮助您解决您的问题。
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Android BLE蓝牙连接代码

以下是一个简单的 Android BLE 蓝牙连接代码示例: ``` private BluetoothManager bluetoothManager; private BluetoothAdapter bluetoothAdapter; private BluetoothDevice bluetoothDevice; private BluetoothGatt bluetoothGatt; // 初始化 BluetoothManager 和 BluetoothAdapter bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); bluetoothAdapter = bluetoothManager.getAdapter(); // 扫描设备并连接 bluetoothAdapter.startLeScan(new UUID[]{MY_UUID}, mLeScanCallback); bluetoothDevice.connectGatt(this, false, mGattCallback); // 扫描设备的回调函数 private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, final int rssi, final byte[] scanRecord) { if (device.getAddress().equals(DEVICE_ADDRESS)) { bluetoothDevice = device; bluetoothAdapter.stopLeScan(mLeScanCallback); } } }; // 连接设备的回调函数 private BluetoothGattCallback mGattCallback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { if (newState == BluetoothProfile.STATE_CONNECTED) { bluetoothGatt = gatt; // 连接成功,开始发现服务 bluetoothGatt.discoverServices(); } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { // 连接断开 bluetoothGatt.close(); } } @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { // 发现服务成功,可以开始进行操作 BluetoothGattService service = gatt.getService(SERVICE_UUID); BluetoothGattCharacteristic characteristic = service.getCharacteristic(CHARACTERISTIC_UUID); characteristic.setValue("Hello, BLE!"); gatt.writeCharacteristic(characteristic); } } @Override public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { // 写入特征值成功 } }; ``` 需要注意的是,此示例中的 UUID、DEVICE_ADDRESS、SERVICE_UUID 和 CHARACTERISTIC_UUID 都需要根据实际情况进行替换。

Android BLE扫描12s后停止扫描

您好!针对您的问题,可以通过以下步骤实现: 1. 获取 BluetoothAdapter 对象并开启蓝牙 ``` BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); BluetoothAdapter bluetoothAdapter = bluetoothManager.getAdapter(); if (!bluetoothAdapter.isEnabled()) { bluetoothAdapter.enable(); } ``` 2. 开启扫描,并设置扫描时间 ``` bluetoothAdapter.startLeScan(callback); // 开始扫描 Handler handler = new Handler(); handler.postDelayed(new Runnable() { @Override public void run() { bluetoothAdapter.stopLeScan(callback); // 停止扫描 } }, 12000); // 设置扫描时间为12秒 ``` 3. 在回调中处理扫描结果 ``` private BluetoothAdapter.LeScanCallback callback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) { // 处理扫描结果 } }; ``` 希望这些信息能够帮助您解决问题。如果您有任何其他问题,请随时提出。

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以下是Android BLE的简单示例代码,包括扫描、连接和断开连接: #### 扫描设备 java private BluetoothAdapter mBluetoothAdapter; private boolean mScanning; private Handler mHandler; // Stops scanning after 10 seconds. private static final long SCAN_PERIOD = 10000; // Initializes Bluetooth adapter. final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); mBluetoothAdapter = bluetoothManager.getAdapter(); // Checks if Bluetooth is supported on the device. if (mBluetoothAdapter == null) { Toast.makeText(this, "Bluetooth is not supported on this device", Toast.LENGTH_SHORT).show(); finish(); return; } // Ensures Bluetooth is enabled on the device. If Bluetooth is not currently // enabled, fire an intent to display a dialog asking the user to grant // permission to enable it. if (!mBluetoothAdapter.isEnabled()) { Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT); } else { scanLeDevice(true); } // Handles various events fired by the Service. // ACTION_GATT_CONNECTED: connected to a GATT server. // ACTION_GATT_DISCONNECTED: disconnected from a GATT server. // ACTION_GATT_SERVICES_DISCOVERED: discovered GATT services. // ACTION_DATA_AVAILABLE: received data from the device. This can be a result of read // or notification operations. private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { final String action = intent.getAction(); if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action)) { // Update UI } else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) { // Update UI } else if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) { // Update UI } else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) { // Update UI } } }; // Stops scanning after a pre-defined scan period. private void scanLeDevice(final boolean enable) { if (enable) { // Stops scanning after a pre-defined scan period. mHandler.postDelayed(new Runnable() { @Override public void run() { mScanning = false; mBluetoothAdapter.stopLeScan(mLeScanCallback); } }, SCAN_PERIOD); mScanning = true; mBluetoothAdapter.startLeScan(mLeScanCallback); } else { mScanning = false; mBluetoothAdapter.stopLeScan(mLeScanCallback); } } // Device scan callback. private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) { runOnUiThread(new Runnable() { @Override public void run() { // Process scan results here. } }); } }; #### 连接设备 java private BluetoothLeService mBluetoothLeService; private boolean mConnected = false; private final ServiceConnection mServiceConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName componentName, IBinder service) { mBluetoothLeService = ((BluetoothLeService.LocalBinder) service).getService(); if (!mBluetoothLeService.initialize()) { Log.e(TAG, "Unable to initialize Bluetooth"); finish(); } // Automatically connects to the device upon successful start-up initialization. mBluetoothLeService.connect(mDeviceAddress); } @Override public void onServiceDisconnected(ComponentName componentName) { mBluetoothLeService = null; } }; // Code to manage Service lifecycle. @Override protected void onResume() { super.onResume(); registerReceiver(mGattUpdateReceiver, makeGattUpdateIntentFilter()); if (mBluetoothLeService != null) { final boolean result = mBluetoothLeService.connect(mDeviceAddress); Log.d(TAG, "Connect request result=" + result); } } @Override protected void onPause() { super.onPause(); unregisterReceiver(mGattUpdateReceiver); } @Override protected void onDestroy() { super.onDestroy(); unbindService(mServiceConnection); mBluetoothLeService = null; } private static IntentFilter makeGattUpdateIntentFilter() { final IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(BluetoothLeService.ACTION_GATT_CONNECTED); intentFilter.addAction(BluetoothLeService.ACTION_GATT_DISCONNECTED); intentFilter.addAction(BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED); intentFilter.addAction(BluetoothLeService.ACTION_DATA_AVAILABLE); return intentFilter; } #### 断开连接 java if (mBluetoothLeService != null) { mBluetoothLeService.disconnect(); mBluetoothLeService.close(); } mConnected = false;
以下是一个简单的 Android BLE 扫描、连接、切断的代码,在进行 100 次操作时,会打印出每一次的操作结果: public class BleScanConnectDisconnect { private static final String TAG = "BleScanConnectDisconnect"; private BluetoothAdapter mBluetoothAdapter; private BluetoothLeScanner mBluetoothLeScanner; private ScanCallback mScanCallback; private BluetoothGatt mBluetoothGatt; private Handler mHandler; public BleScanConnectDisconnect(Context context) { mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); mBluetoothLeScanner = mBluetoothAdapter.getBluetoothLeScanner(); mHandler = new Handler(); } public void startScan() { Log.d(TAG, "startScan"); mScanCallback = new ScanCallback() { @Override public void onScanResult(int callbackType, ScanResult result) { Log.d(TAG, "onScanResult: " + result.getDevice().getName() + " " + result.getDevice().getAddress()); } @Override public void onScanFailed(int errorCode) { Log.e(TAG, "onScanFailed: " + errorCode); } }; mBluetoothLeScanner.startScan(mScanCallback); } public void stopScan() { Log.d(TAG, "stopScan"); mBluetoothLeScanner.stopScan(mScanCallback); } public void connect(String address) { Log.d(TAG, "connect: " + address); BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address); mBluetoothGatt = device.connectGatt(context, false, new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { Log.d(TAG, "onConnectionStateChange: " + newState); if (newState == BluetoothProfile.STATE_CONNECTED) { gatt.discoverServices(); } } @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { Log.d(TAG, "onServicesDiscovered: " + status); } @Override public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { Log.d(TAG, "onCharacteristicRead: " + characteristic.getUuid()); } @Override public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { Log.d(TAG, "onCharacteristicWrite: " + characteristic.getUuid()); } @Override public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) { Log.d(TAG, "onCharacteristicChanged: " + characteristic.getUuid()); } @Override public void onDescriptorRead(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) { Log.d(TAG, "onDescriptorRead: " + descriptor.getUuid()); } @Override public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) { Log.d(TAG, "onDescriptorWrite: " + descriptor.getUuid()); } @Override public void onReliableWriteCompleted(BluetoothGatt gatt, int status) { Log.d(TAG, "onReliableWriteCompleted"); } @Override public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) { Log.d(TAG, "onReadRemoteRssi: " + rssi); } }); } public void disconnect() { Log.d(TAG, "disconnect"); if (mBluetoothGatt != null) { mBluetoothGatt.disconnect(); } } public void close() { Log.d(TAG, "close"); if (mBluetoothGatt != null) { mBluetoothGatt.close(); } } public void test() { for (int i = 0; i < 100; i++) { Log.d(TAG, "============================= " + (i + 1) + " ============================="); startScan(); mHandler.postDelayed(new Runnable() { @Override public void run() { stopScan(); } }, 5000); mHandler.postDelayed(new Runnable() { @Override public void run() { connect("00:00:00:00:00:00"); } }, 6000); mHandler.postDelayed(new Runnable() { @Override public void run() { disconnect(); } }, 8000); mHandler.postDelayed(new Runnable() { @Override public void run() { close(); } }, 10000); } } } 在 test() 方法中,我们进行了 100 次操作,每一次操作都包括开始扫描、停止扫描、连接、切断和关闭。每一次操作之间会有一定的时间间隔,可以根据实际情况进行调整。在操作完成后,会打印出每一次操作的结果。
你好,关于Java代码实现Android自动连接BLE设备的问题,我可以为您提供一些基本的思路和参考代码。首先,您需要使用Android中的BLE API来搜索和连接BLE设备。然后,您可以使用服务和特征值来与设备进行通信。以下是一些可能有用的示例代码: 1. 初始化BLE适配器和回调函数 BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); BluetoothAdapter mBluetoothAdapter = bluetoothManager.getAdapter(); BluetoothGatt mBluetoothGatt; //设备连接状态回调函数 private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { if (newState == BluetoothProfile.STATE_CONNECTED) { Log.d(TAG, "Connected to GATT server."); mBluetoothGatt.discoverServices(); //连接成功之后搜索设备的服务 } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { Log.d(TAG, "Disconnected from GATT server."); } } }; 2. 搜索BLE设备 //BLE设备广播回调函数 private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { final String action = intent.getAction(); if (BluetoothDevice.ACTION_FOUND.equals(action)) { //获取扫描到的设备信息 BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); if (device.getName() != null) { Log.d(TAG, "Found device: " + device.getName()); if (device.getName().equals("My BLE Device")) { //如果找到指定设备 //停止扫描并连接设备 mBluetoothAdapter.stopLeScan(mLeScanCallback); mBluetoothGatt = device.connectGatt(getApplicationContext(), false, mGattCallback); } } } } }; //开始搜索设备 private void scanBLEDevices() { mHandler.postDelayed(new Runnable() { @Override public void run() { mBluetoothAdapter.stopLeScan(mLeScanCallback); } }, 10000); //设置扫描时间为10s mBluetoothAdapter.startLeScan(mLeScanCallback); } //设备搜索回调函数 private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) { runOnUiThread(new Runnable() { @Override public void run() { Log.d(TAG, "Found device: " + device.getName()); } }); } }; 3. 连接BLE设备并搜索服务 //连接设备 private void connectToDevice(String deviceAddress) { BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(deviceAddress); mBluetoothGatt = device.connectGatt(this, false, mGattCallback); } //搜索服务 private void discoverServices() { if (mBluetoothGatt != null) { mBluetoothGatt.discoverServices(); } } //服务搜索回调函数 @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { List<BluetoothGattService> services = gatt.getServices(); for (BluetoothGattService service : services) { Log.d(TAG, "Found service: " + service.getUuid()); } } else { Log.d(TAG, "Service discovery failed."); } } 以上是简单的示例代码,您可以根据自己的需求进行相应的更改和扩展。同时,也需要注意安全与隐私问题,确保BLE设备的安全连接和数据传输。希望能够对您有所帮助。
以下是BLE Android源代码中BLE扫描和连接的示例代码: BLE扫描: java private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) { runOnUiThread(new Runnable() { @Override public void run() { // 将扫描到的设备添加到列表中 mLeDeviceListAdapter.addDevice(device); mLeDeviceListAdapter.notifyDataSetChanged(); } }); } }; BLE连接: java private BluetoothGattCallback mGattCallback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { if (newState == BluetoothProfile.STATE_CONNECTED) { // 连接成功后,开始搜索服务 gatt.discoverServices(); } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { // 断开连接 mBluetoothGatt.close(); mBluetoothGatt = null; } } @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { // 搜索到服务后,可以根据服务和特征值读写数据 BluetoothGattService service = gatt.getService(UUID.fromString(SERVICE_UUID)); BluetoothGattCharacteristic characteristic = service.getCharacteristic(UUID.fromString(CHARACTERISTIC_UUID)); characteristic.setValue("Hello, BLE".getBytes()); gatt.writeCharacteristic(characteristic); } } @Override public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { // 读取特征值的响应 } @Override public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { // 写入特征值的响应 } @Override public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) { // 特征值发生变化 } }; 需要注意的是,在使用BLE功能前,需要先检查设备是否支持BLE功能,并获取BluetoothAdapter对象。示例代码如下: java // 检查设备是否支持BLE功能 if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) { Toast.makeText(this, "BLE not supported", Toast.LENGTH_SHORT).show(); finish(); } // 获取BluetoothAdapter对象 final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); mBluetoothAdapter = bluetoothManager.getAdapter(); 同时,在使用完BLE功能后,需要释放相关资源。示例代码如下: java @Override protected void onDestroy() { super.onDestroy(); if (mBluetoothGatt != null) { mBluetoothGatt.close(); mBluetoothGatt = null; } } 希望这些代码能够对你有所帮助。
以下是 Android 手机蓝牙与 BLE 设备建立连接的代码示例: 1. 在 AndroidManifest.xml 文件中添加蓝牙权限: xml <uses-permission android:name="android.permission.BLUETOOTH" /> <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> 2. 在 Activity 中初始化 BluetoothAdapter 对象: java private BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); 3. 扫描 BLE 设备并建立连接: java // 扫描时间 10 秒 private static final long SCAN_PERIOD = 10000; // 扫描回调 private final BluetoothAdapter.LeScanCallback leScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) { // 根据设备名称或 MAC 地址过滤 if (device.getName() != null && device.getName().startsWith("BLE")) { // 停止扫描 bluetoothAdapter.stopLeScan(leScanCallback); // 建立连接 device.connectGatt(MainActivity.this, false, gattCallback); } } }; // GATT 回调 private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { if (newState == BluetoothProfile.STATE_CONNECTED) { // 连接成功,开始发现服务 gatt.discoverServices(); } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { // 连接断开 Log.i(TAG, "Disconnected from GATT server."); } } @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { // 服务发现成功,可以进行数据交互 Log.i(TAG, "Services discovered."); } else { Log.w(TAG, "onServicesDiscovered received: " + status); } } @Override public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { // 读取特征值成功 Log.i(TAG, "Characteristic read successfully."); } else { Log.w(TAG, "Characteristic read failed: " + status); } } }; // 开始扫描 BLE 设备 private void scanBLEDevice() { if (bluetoothAdapter == null) { Log.w(TAG, "Bluetooth not supported."); return; } // 如果正在扫描,则先停止扫描 bluetoothAdapter.stopLeScan(leScanCallback); // 开始扫描 bluetoothAdapter.startLeScan(leScanCallback); // 扫描 SCAN_PERIOD 后停止扫描 new Handler().postDelayed(new Runnable() { @Override public void run() { bluetoothAdapter.stopLeScan(leScanCallback); } }, SCAN_PERIOD); } 注意:在建立连接之前需要先扫描 BLE 设备,扫描到符合条件的设备后才能进行连接。在连接建立成功后,需要调用 discoverServices() 方法发现设备的服务,然后才能进行数据交互。以上代码仅供参考,实际开发中需要根据具体需求进行调整。
以下是Android Studio中扫描BLE蓝牙设备、连接设备、以及断开连接的代码: 1. 检查蓝牙是否打开 java // 检查蓝牙是否打开 private boolean isBluetoothEnabled() { BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); return bluetoothAdapter != null && bluetoothAdapter.isEnabled(); } 2. 扫描BLE设备 java // 扫描BLE设备 private void scanBLEDevices() { BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); if (bluetoothAdapter == null) { Log.e(TAG, "Device doesn't support Bluetooth"); return; } if (!isBluetoothEnabled()) { Log.e(TAG, "Bluetooth is not enabled"); return; } bluetoothAdapter.startLeScan(new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, final int rssi, byte[] scanRecord) { // 处理扫描到的设备 runOnUiThread(new Runnable() { @Override public void run() { // 处理扫描到的设备 } }); } }); } 3. 连接设备 java // 连接设备 private void connectToDevice(BluetoothDevice device) { BluetoothGatt bluetoothGatt = device.connectGatt(this, false, new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { // 处理连接状态改变 } @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { // 处理服务发现 } @Override public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { // 处理读取特征值 } @Override public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) { // 处理特征值改变 } @Override public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { // 处理写入特征值 } }); } 4. 断开连接 java // 断开连接 private void disconnectGatt(BluetoothGatt bluetoothGatt) { if (bluetoothGatt != null) { bluetoothGatt.disconnect(); bluetoothGatt.close(); } } 注意:以上代码仅为示例,需要根据具体需求进行修改。同时,BLE蓝牙连接需要遵循一定的协议,需要根据设备提供的文档进行开发。
要在Android上实现BLE(蓝牙低功耗)客户端主动连接BLE服务器,可以按照以下步骤进行操作: 1. 确保你的Android设备支持BLE功能,并在AndroidManifest.xml文件中添加必要的权限和特性声明(例如BLUETOOTH和BLUETOOTH_ADMIN权限)。 2. 创建一个BLE客户端类,该类将负责处理与BLE设备的连接和通信。你可以使用BluetoothAdapter类来获取本地蓝牙适配器,并使用BluetoothDevice类来表示和操作BLE设备。 3. 初始化BLE适配器: java BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); BluetoothAdapter bluetoothAdapter = bluetoothManager.getAdapter(); 4. 扫描并获取要连接的BLE设备: java bluetoothAdapter.startLeScan(mLeScanCallback); ... private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) { // 根据设备名称或其他标识符筛选要连接的BLE设备 if (device.getName().equals("YourDeviceName")) { // 发现目标设备后,停止扫描 bluetoothAdapter.stopLeScan(mLeScanCallback); // 连接到BLE设备 connectToDevice(device); } } }; 5. 连接到BLE设备: java private BluetoothGatt mBluetoothGatt; private void connectToDevice(BluetoothDevice device) { mBluetoothGatt = device.connectGatt(this, false, mGattCallback); } private BluetoothGattCallback mGattCallback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { if (newState == BluetoothProfile.STATE_CONNECTED) { // 连接成功 gatt.discoverServices(); // 发现BLE设备支持的服务 } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { // 连接断开 } } @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { // 发现BLE设备的服务后,可以进行进一步操作,如读取或写入特征值等 } // 其他回调方法,如读取/写入特征值的结果等 }; 6. 在onServicesDiscovered()方法中,你可以获取到BLE设备支持的服务和特征值,并根据需要进行读取、写入或订阅操作。 这些步骤只是一个基本示例,实际情况可能会因应用程序的需求和BLE设备的特性而有所不同。你可以根据自己的需求来扩展和优化代码。同时,请注意处理异常情况和适当的错误处理。
以下是一个简单的 Android 示例代码,用于获取 BLE 蓝牙设备列表: import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothManager; import android.content.Context; import android.os.Bundle; import android.os.Handler; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.widget.ArrayAdapter; import android.widget.ListView; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { private BluetoothAdapter mBluetoothAdapter; private ArrayList<String> mDeviceList = new ArrayList<>(); private ListView mListView; private ArrayAdapter<String> mAdapter; private Handler mHandler = new Handler(); private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, final int rssi, final byte[] scanRecord) { runOnUiThread(new Runnable() { @Override public void run() { if (!mDeviceList.contains(device.getName() + "\n" + device.getAddress())) { mDeviceList.add(device.getName() + "\n" + device.getAddress()); mAdapter.notifyDataSetChanged(); } } }); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mListView = findViewById(R.id.listView); mAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, mDeviceList); mListView.setAdapter(mAdapter); // 获取 BluetoothAdapter 对象 final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); mBluetoothAdapter = bluetoothManager.getAdapter(); // 检查设备是否支持 BLE if (!getPackageManager().hasSystemFeature(android.content.pm.PackageManager.FEATURE_BLUETOOTH_LE)) { Log.e("MainActivity", "BLE not supported"); finish(); } // 开启 Bluetooth 以及 BLE if (!mBluetoothAdapter.isEnabled()) { mBluetoothAdapter.enable(); } // 开始扫描 BLE 设备 mHandler.postDelayed(new Runnable() { @Override public void run() { mBluetoothAdapter.stopLeScan(mLeScanCallback); } }, 10000); mBluetoothAdapter.startLeScan(mLeScanCallback); } @Override protected void onDestroy() { super.onDestroy(); // 停止扫描 BLE 设备 mBluetoothAdapter.stopLeScan(mLeScanCallback); } } 这个示例代码实现了以下操作: 1. 获取 BluetoothAdapter 对象 2. 检查设备是否支持 BLE 3. 开启 Bluetooth 以及 BLE 4. 创建 BluetoothAdapter.LeScanCallback 对象 5. 开始扫描 BLE 设备 6. 在 BluetoothAdapter.LeScanCallback 中处理扫描结果 7. 在列表中显示扫描到的设备名称和地址 8. 停止扫描 BLE 设备 注意:在使用 BLE API 时,必须先获取适当的权限和声明。
以下是一个基本的 Android BLE 蓝牙连接示例代码,用于连接指定 MAC 地址的智能血压计设备。请注意,此代码仅作为参考,具体实现可能因设备和 Android 版本而异。 首先,确保你的应用程序已经请求了蓝牙权限。 <uses-permission android:name="android.permission.BLUETOOTH" /> <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 然后,在您的代码中,您需要使用 BluetoothAdapter 来执行扫描操作。在扫描期间,当您发现匹配的设备时,您可以使用 BluetoothDevice 对象连接到它。 private BluetoothAdapter mBluetoothAdapter; private BluetoothGatt mBluetoothGatt; private BluetoothDevice mDevice; private String mDeviceAddress = "00:11:22:33:44:55"; // 初始化蓝牙适配器 final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); mBluetoothAdapter = bluetoothManager.getAdapter(); // 开始扫描设备 mBluetoothAdapter.startLeScan(mLeScanCallback); // 扫描回调 private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) { // 扫描到指定设备 if (device.getAddress().equals(mDeviceAddress)) { mDevice = device; // 停止扫描 mBluetoothAdapter.stopLeScan(mLeScanCallback); // 连接设备 mBluetoothGatt = mDevice.connectGatt(getApplicationContext(), false, mGattCallback); } } }; 在连接到设备后,您需要使用 BluetoothGattCallback 来处理连接事件、服务发现和特征写入等操作。 private BluetoothGattCallback mGattCallback = new BluetoothGattCallback() { // 连接状态改变 @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { if (newState == BluetoothProfile.STATE_CONNECTED) { // 连接成功,开始服务发现 gatt.discoverServices(); } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { // 连接断开 mBluetoothGatt.close(); mBluetoothGatt = null; } } // 服务发现完成 @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { // 在这里可以连接设备的服务和特征,然后进行读/写操作 BluetoothGattService service = mBluetoothGatt.getService(UUID.fromString(SERVICE_UUID)); BluetoothGattCharacteristic characteristic = service.getCharacteristic(UUID.fromString(CHARACTERISTIC_UUID)); gatt.setCharacteristicNotification(characteristic, true); // 写入数据到设备 byte[] data = {0x01, 0x02, 0x03}; characteristic.setValue(data); gatt.writeCharacteristic(characteristic); } } // 特征写入完成 @Override public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { // 写入完成后,可以断开连接 gatt.disconnect(); } }; 最后,如果需要,在断开连接时关闭 BluetoothGatt 对象。 if (mBluetoothGatt != null) { mBluetoothGatt.close(); mBluetoothGatt = null; }
在uniapp原始开发中,可以使用uni-ble这个插件来监听蓝牙广播。具体步骤如下: 1. 首先,需要在uniapp项目中安装uni-ble插件。可以使用以下命令进行安装: npm install uni-ble 2. 在需要监听蓝牙广播的页面中,引入uni-ble插件,并创建一个蓝牙实例,示例代码如下: import ble from 'uni-ble'; const bluetooth = new ble.Bluetooth(); // 在这里可以对蓝牙实例进行配置,例如设置扫描周期、扫描过滤器等 // 开始扫描蓝牙设备 bluetooth.startScan({ success(res) { // 成功开始扫描蓝牙设备 }, fail(err) { // 开始扫描蓝牙设备失败 }, complete() { // 扫描结束 }, }); // 监听蓝牙设备广播 bluetooth.on('scan', (device) => { // 处理蓝牙设备广播信息 }); 在上面的代码中,我们创建了一个蓝牙实例bluetooth,并在其中设置了扫描周期等参数。然后,通过bluetooth.startScan()方法开始扫描蓝牙设备,同时通过bluetooth.on()方法监听蓝牙设备广播信息。 3. 在监听到蓝牙设备广播后,可以对设备信息进行处理。例如,可以获取设备的UUID、信号强度等信息。示例代码如下: bluetooth.on('scan', (device) => { console.log('扫描到蓝牙设备:', device); console.log('设备名称:', device.name); console.log('设备UUID:', device.uuid); console.log('信号强度:', device.rssi); }); 在上面的代码中,我们通过console.log()方法输出了设备的名称、UUID和信号强度等信息。 以上就是在uniapp原始开发中实现监听蓝牙广播的方法。需要注意的是,uni-ble插件只支持Android和iOS平台。

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