Difference between revisions of "Device (Java)"

Latest revision as of 03:42, 1 May 2018

ru.neuromd.neurosdk

Class Device

Related Classes

ru.neuromd.neurosdk.DeviceScanner

Classes hierarchy

• java.lang.Object
• ru.neuromd.neurosdk.Device

Class definition

public class Device

The Device class is an abstraction for NeuroMD BLE devices. This abstraction provides functions for changing of device state by executing commands and setting parameters. Each device have different sets of supported commands and parameters, Device class has functions designed to get information about these sets. Callibri and Braibit devices has different parameters sets and provides different ways to access them. Device class hides all differences behind its interface and provides universal way to read and write parameters, execute commands and receive biopotential signals.

Fields Summary

Constructor Summary

You are not able to create Device directly. Use DeviceScanner to find and create devices

Methods Summary

Field Detail

parameterChanged

public final SubscribersNotifier<ParameterName> parameterChanged

Subscribe this event to receive notifications about changes of device parameters

Method Detail

connect

public void connect()

Tries to establish connection with device. Check DeviceState parameter or subscribe parameterChanged event for operation result.

disconnect

public void disconnect()

Disconnects from device. Check DeviceState parameter or subscribe parameterChanged event for operation result

channels

public ChannelInfo[] channels()

Returns information about supported channels.

Check this information before creation of channel. If device does not support channel, channel object won't be initialized with it.

Returns:

Array of channel info objects

commands

public Command[] commands()

Returns supported commands of device

Returns:

Array of supported commands

parameters

public Parameter[] parameters()

Returns all available parameters of device, their types and access rights

Returns:

Array of available parameters

execute

public boolean execute(Command cmd)

Tries to execute command and returns value indicating operations success.

Will throw if device does not support specified command. To get supported commands call commands() method.

Parameters:

cmd - Command to execute

Returns:

Operation success indicator

Throws:

java.lang.UnsupportedOperationException

readParam

public<ParamType> ParamType readParam(ParameterName param)

Return value of specified parameter of device.

Will throw if parameter does not present in device. To get supported parameters and type information for parameter call parameters() method. It returns Parameter object which consists of parameter name, type and access mode.

Parameters:

param - ParameterName to read

Returns:

Parameter value

Throws:

java.lang.UnsupportedOperationException

setParam

public boolean setParam(ParameterName param, Object value)

Sets value for specified parameter and returns value indicating success of operation.

Will throw if parameter does not present in device or has only Read access mode. To get supported parameters and type information for parameter call parameters() method. It returns Parameter object which consists of parameter name, type and access mode

Parameters:

param - Name of parameter to set

value - Parameter value

Returns:

Operation success indicator

Throws:

java.lang.UnsupportedOperationException

Example

This example shows how to find devices and list their features

import com.neuromd.common.INotificationCallback;
import com.neuromd.neurosdk.Device;
import com.neuromd.neurosdk.DeviceScanner;
import com.neuromd.neurosdk.channels.ChannelInfo;
import com.neuromd.neurosdk.parameters.Command;
import com.neuromd.neurosdk.parameters.Parameter;
import com.neuromd.neurosdk.parameters.ParameterName;
import com.neuromd.neurosdk.parameters.types.DeviceState;

public class DeviceInfoActivity extends AppCompatActivity
{
    private DeviceScanner mScanner;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_device_info);
    
        requestPermissions();
        enableBtAndGeolocation();
        initScanner();
        initButtons();
    }
    
    private void initScanner()
    {
        mScanner = new DeviceScanner(getApplicationContext());
        mScanner.scanStateChanged.subscribe(new INotificationCallback<Boolean>()
        {
            @Override
            public void onNotify(Object o, final Boolean isScanning)
            {
                runOnUiThread(new Runnable()
                {
                    @Override
                    public void run()
                    {
                        Button startButton = findViewById(R.id.startScanButton);
                        Button stopButton = findViewById(R.id.stopScanButton);
                        startButton.setEnabled(!isScanning);
                        stopButton.setEnabled(isScanning);
                    }
                });
            }
        });
        mScanner.deviceFound.subscribe(new INotificationCallback<Device>()
        {
            @Override
            public void onNotify(Object o, Device device)
            {
                onDeviceFound(device);
            }
        });
    }
    
    private void requestPermissions(){
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
        {
            requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
        }
    }
    
    private void enableBtAndGeolocation(){
        Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(enableBtIntent, 1);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
            final LocationManager manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE );
            if ( !manager.isProviderEnabled( LocationManager.GPS_PROVIDER ) ) {
                Intent enableGeoIntent = new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                startActivityForResult(enableGeoIntent, 1);
            }
        }
    }
    
    private void initButtons()
    {
        Button startButton = findViewById(R.id.startScanButton);
        startButton.setEnabled(true);
        startButton.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                mScanner.startScan(0); //zero is for infinity
            }
        });
    
        Button stopButton = findViewById(R.id.stopScanButton);
        stopButton.setEnabled(false);
        stopButton.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                mScanner.stopScan();
            }
        });
    }
    
    private void onDeviceFound(final Device device)
    {
        device.parameterChanged.subscribe(new INotificationCallback<ParameterName>()
        {
            @Override
            public void onNotify(Object o, ParameterName parameterName)
            {
                if (parameterName == ParameterName.State){
                    DeviceState state = device.readParam(ParameterName.State);
                    if (state == DeviceState.Connected){
                        runOnUiThread(new Runnable()
                        {
                            @Override
                            public void run()
                            {
                                onDeviceConnected(device);
                            }
                        });
                    }
                }
            }
        });
        device.connect();
    }
    
    private void onDeviceConnected(Device device)
    {
        EditText deviceInfoText = findViewById(R.id.infoText);
        
        String deviceName = device.readParam(ParameterName.Name);
        String deviceAddress = device.readParam(ParameterName.Address);
        deviceInfoText.append(String.format("Found device: %s [%s]\n", deviceName, deviceAddress));
    
        deviceInfoText.append("Supported params:\n");
        Parameter[] deviceParams = device.parameters();
        for (Parameter param : deviceParams)
        {
            String paramName = param.getName().toString();
            String accessMode = param.getAccess().toString();
            deviceInfoText.append(String.format("-%s {%s}\n", paramName, accessMode));
        }
    
        deviceInfoText.append("\nSupported commands:\n");
        Command[] deviceCommands = device.commands();
        for (Command cmd : deviceCommands)
        {
            deviceInfoText.append(String.format("-%s \n", cmd.toString()));
        }
    
        deviceInfoText.append("\nSupported channels:\n");
        ChannelInfo[] deviceChannels = device.channels();
        for (ChannelInfo channel : deviceChannels)
        {
            String channelName = channel.getName();
            deviceInfoText.append(String.format("-%s \n", channelName));
        }
    }
}

Possible output:

See also

NeuroMD SDK Manual

Device (C++)