连接到BLE设备后如何获取电池电量

Question

我正在开发一个应用程序，我必须在Android 4.3上连接到蓝牙设备。

我想通过使用Battery_Service和Battery_Level来获得电池电量。

public class BluetoothLeService extends Service {
    private static final UUID Battery_Service_UUID =
                UUID.fromString("0000180F-0000-1000-8000-00805f9b34fb");
    private static final UUID Battery_Level_UUID =
                UUID.fromString("00002a19-0000-1000-8000-00805f9b34fb");

    public void getbattery() {
        BluetoothGattService batteryService = mBluetoothGatt.getService(Battery_Service_UUID);
        if(batteryService == null) {
            Log.d(TAG, "Battery service not found!");
            return;
        }
        BluetoothGattCharacteristic batteryLevel = batteryService.getCharacteristic(Battery_Level_UUID);
        if(batteryLevel == null) {
            Log.d(TAG, "Battery level not found!");
            return;
        }
         mBluetoothGatt.readCharacteristic(batteryLevel);
    　　　　　// What should I do that I can get the battery level ??
         Log.d(TAG, "Battery level " + mBluetoothGatt.readCharacteristic(batteryLevel););
    }
}

但mBluetoothGatt.readCharacteristic(batteryLevel);的值不是电池电量值

如何读取电池？

Answer 1

我已经解决了这个问题。

public class BluetoothLeService extends Service {
    private static final UUID Battery_Service_UUID = UUID.fromString("0000180F-0000-1000-8000-00805f9b34fb");
    private static final UUID Battery_Level_UUID = UUID.fromString("00002a19-0000-1000-8000-00805f9b34fb");
    public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        if(status == BluetoothGatt.GATT_SUCCESS) {
            broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
        }
    }

    private void broadcastUpdate(final String action, final BluetoothGattCharacteristic characteristic) {
        final Intent intent = new Intent(action);   
        Log.v(TAG, "characteristic.getStringValue(0) = " + characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0));
        intent.putExtra(DeviceControl.EXTRAS_DEVICE_BATTERY, characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0));  
        sendBroadcast(intent);
    }
    public void getbattery() {
        BluetoothGattService batteryService = mBluetoothGatt.getService(Battery_Service_UUID);
        if(batteryService == null) {
            Log.d(TAG, "Battery service not found!");
            return;
        }
        BluetoothGattCharacteristic batteryLevel = batteryService.getCharacteristic(Battery_Level_UUID);
        if(batteryLevel == null) {
            Log.d(TAG, "Battery level not found!");
            return;
        }
        mBluetoothGatt.readCharacteristic(batteryLevel);
        Log.v(TAG, "batteryLevel = " + mBluetoothGatt.readCharacteristic(batteryLevel));
    }
}

当你调用函数getbattery() 时，它会调用onCharacteristicRead 。onCharacteristicRead将调用broadcastUpdate并将特征和操作传递给它。

而broadcastUpdate中的characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0)是BLE设备的电池值。