android 获取手机配对的蓝牙耳机的电量
第一步 首先添加权限,记得动态申请
<uses-permission android:name="android.permission.BLUETOOTH"/> <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/> <uses-permission android:name="android.permission.BLUETOOTH_CONNECT"/> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
第二步,获取配对的设备
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); if (bluetoothAdapter == null) {textView.setText("不支持蓝牙");// 设备不支持蓝牙Log.e(TAG, "Device doesn't support Bluetooth"); } else {if (!bluetoothAdapter.isEnabled()) {Log.e(TAG, "open Bluetooth");// 请求用户打开蓝牙Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);startActivityForResult(enableBtIntent, 99);} else {textView.setText("蓝牙已打开");getData();} }
private void getData() {Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();if (pairedDevices.size() > 0) {for (BluetoothDevice device : pairedDevices) {if (device.getName().contains("HUAWEI")) { //目标设备// 假设我们找到了目标蓝牙耳机getBatteryInfo(device);}}} else {tvContent.setText("no pair devices");} }
第三步,根据device获取电量,这里有两种方式
方式1,直接反射系统接口获取,但是获取的电量不是精确的,是两个耳机中电量最低的那个整数值,而且并不是实时的,每变化10%更新一次
private void getBatteryInfo(BluetoothDevice device) {try {Method getBatteryLevel = device.getClass().getMethod("getBatteryLevel");int batteryLevel = (Integer) getBatteryLevel.invoke(device);Log.e(TAG, "Battery Level: " + batteryLevel + "%");showBatteryLevelToUser(batteryLevel);} catch (Exception e) {e.printStackTrace();Log.e(TAG, "Failed to get battery level");} }
方式2,适用于支持ble蓝牙的设备,通过BluetoothGatt类去获取,这种方式需要知道电量uuid,虽然官方有默认的电量uuid,但是部分厂家会用自己定义的,电量特征的uuid如果是左右两个耳机,可能是不同的,需要分别获取电量值。
- 真无线耳机(TWS)通常将左右耳设计为两个独立的BLE设备,或通过单一设备的不同特征值(Characteristic)区分左右电量。
- 标准做法:左/右耳机电量分别存储在
Battery Service
下的不同特征值中(例如左耳UUID:00002a19-0000-1000-8000-00805f9b34fb
,右耳可能为自定义UUID)
private static final UUID MY_SERVICE_UUID = UUID.fromString("0000180F-0000-1000-8000-00805F9B34FB"); // 电池服务UUID private static final UUID MY_CHARACTERISTIC_UUID = UUID.fromString("00002A19-0000-1000-8000-00805F9B34FB"); // 电池电量级别特性UUID
private void connectToDevice(BluetoothDevice device) {@SuppressLint("MissingPermission")BluetoothGatt bluetoothGatt = device.connectGatt(this, false, new BluetoothGattCallback() {@Overridepublic void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {if (newState == BluetoothProfile.STATE_CONNECTED) { // 成功连接gatt.discoverServices(); // 成功连接} else if (newState == BluetoothProfile.STATE_DISCONNECTED){Log.e(TAG,"gatt disConnect");} else {Log.e(TAG,"gatt fail");}}@Overridepublic void onServicesDiscovered(BluetoothGatt gatt, int status) {if (status == BluetoothGatt.GATT_SUCCESS) {List<BluetoothGattService> services = gatt.getServices();Log.e(TAG,"BluetoothGattService size" + services.size());BluetoothGattService batteryService = gatt.getService(MY_SERVICE_UUID); // 确认是电池服务if (batteryService != null) {BluetoothGattCharacteristic batteryLevelCharacteristic = batteryService.getCharacteristic(MY_CHARACTERISTIC_UUID); // 确认是电量特征,左右耳机可能不一样,需要分别获取,这里只获取一个boolean success = gatt.readCharacteristic(batteryLevelCharacteristic); // 读取电量信息if (success) {Log.e(TAG,"gatt getBattery success");// 等待 onCharacteristicRead回调来获取数据} else {// 读取失败处理Log.e(TAG,"gatt getBattery fail");}} else {Log.e(TAG, "batteryService is null");}} else {// 服务发现失败处理Log.e(TAG,"onServicesDiscovered fail");}}@Overridepublic void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {if (status == BluetoothGatt.GATT_SUCCESS) {int batteryLevel = characteristic.getValue()[0];// 直接转换为整数Log.e(TAG, "Battery Level: " + batteryLevel + "%");if (characteristic.getUuid().equals(“左边耳机的uuid”)) { Log.d(TAG, "左耳电量: " + batteryLevel + "%"); } else if (characteristic.getUuid().equals(“右边耳机的uuid”)) { Log.d(TAG, "右耳电量: " + batteryLevel + "%"); }// 将电量信息展示给用户showBatteryLevelToUser(batteryLevel);}}}); }