How to Get the Battery Level After Connect to the Ble Device

How to get the battery level after connect to the BLE device?

I have solved this problem.

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));
    }
}

When you call the function getbattery() , it will call onCharacteristicRead.
and onCharacteristicRead will call broadcastUpdate and transmit the characteristic and action to it.

And the characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0) in broadcastUpdate is the battery value of the BLE device.

how to update the battery level for every 5seconds in ble in android

If I well understood your question, you will need a Timer in order to check you battery level regularly.

For instance, you could use this code after starting your device control activity, maybe at the end of the onServiceConnected method :

please put the timer at the end of onServiceConnected() method of mServiceConnection object

Timer timer = new Timer("batteryTimer");
TimerTask task = new TimerTask() {
@Override
public void run() {
mBluetoothLeService.getBattery();
}
};
timer.scheduleAtFixedRate(task, 0, 5000);

And do not forget to call timer.cancel() when the activity is finishing.

And in the service, you could put something like that :

public void getBattery() {

if (mBluetoothGatt == null) {
Log.e(TAG, "lost connection");
} 

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);
}

It is an example which would need to be modified but that gives you an idea on how to do it.

Somebody already did access to the battery value in the link below :
How to get the battery level after connect to the BLE device?

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