IOIOService and handleMessage

[Trevor White]

Hi. I am trying to get the IOIO board to run from a service and actually be able to fire messages between that and the main activity. I read some tutorials and kinda got it working but my understanding is still lacking. 

I have attached my current code at the bottom. It is just code I am playing with at the moment. I do not think it is quite right. What I would like to do is send messages to the ioio service that can be sent out on a usart. It is more for learning at the moment and I do not have an end goal as such in mind. To start with I thought I would just toggle the LED pin based on messages coming in. 

The problem with the code below is that I cant handle a message and act on the led directly. I have to set a 'led_state' and look for that in the main loop of the service. Is there a way to have the messages know of the led and act from within handleMessage code?

Thanks

Trev

public class IOIO_Service extends IOIOService {

private static final String TAG = "IOIOService";

// Used to receive messages from the Activity

final Messenger inMessenger = new Messenger(new IncomingHandler());

// Use to send message to the Activity

private Messenger outMessenger;

public static final int LED_ON  = 1;

public static final int LED_OFF = 2;

public static  int led_state = LED_ON;

private boolean led_changed = true;

private Handler handler;

@Override

public void onCreate() {

super.onCreate();

}

class IncomingHandler extends Handler {

@Override

public void handleMessage(Message msg) {

Log.e("MESSAGE", "Got message");

Bundle data = msg.getData();

//String urlPath = data.getString(DownloadServiceMessenger.URLPATH);

//String fileName = data.getString(DownloadServiceMessenger.FILENAME);

//String outputPath = download(urlPath, fileName);

Message backMsg = Message.obtain();

if ( led_state == LED_ON ) {

led_state = LED_OFF;

}

else {

led_state = LED_ON;

}

led_changed = true;

backMsg.arg1 = led_state;

Bundle bundle = new Bundle();

backMsg.setData(bundle);

try {

outMessenger.send(backMsg);

} catch (android.os.RemoteException e1) {

Log.w(getClass().getName(), "Exception sending message", e1);

}

}

}

@Override

protected IOIOLooper createIOIOLooper() {

return new BaseIOIOLooper() {

private DigitalOutput led_;

/*--- this pin indicates to the ioio monitor processor that we are alive -----*/

private DigitalOutput alive_pin;

private Uart uart_;

private InputStream reading_;

@Override

protected void setup() throws ConnectionLostException,

InterruptedException {

Log.d(TAG,"setup");

led_ = ioio_.openDigitalOutput(IOIO.LED_PIN);

alive_pin = ioio_.openDigitalOutput(24);

uart_ = ioio_.openUart( 7, 10, 115200, Uart.Parity.NONE,Uart.StopBits.ONE );

reading_ = uart_.getInputStream();

}

@Override

public void loop() throws ConnectionLostException,

InterruptedException {

if ( led_changed == true ) {

if ( led_state == LED_ON ) { 

led_.write(true);

Log.d(TAG, "LED_ON");

}

else if ( led_state == LED_OFF ){

led_.write(false);

Log.d(TAG, "LED_OFF");

}

led_changed = false;

}

Thread.sleep(50);

//led_.write(false);

//Thread.sleep(500);

}

};

}

@Override

public void onStart(Intent intent, int startId) {

super.onStart(intent, startId);

}

@Override

public IBinder onBind(Intent intent) {

Bundle extras = intent.getExtras();

// Get messager from the Activity

if (extras != null) {

outMessenger = (Messenger) extras.get("MESSENGER");

}

// Return our messenger to the Activity to get commands

return inMessenger.getBinder();

}

}

[Ytai Ben-Tsvi]

I haven't read through your code, but you can simply have a DigitalOutput, or Uart type member in the outer class, have setup() initialize it have have handleMessage use it (just check that its non-null and handle a ConnectionLostException properly).

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[Trevor White]

Thanks for the reply. Much appreciated.

[Kevin Miller]

I took your code as a starting point and also used some tips from StackOverflow and other sites and made a basic example of a IOIO service handing requests and replys from multiple activities, and also having the service broadcast events, like connect and disconnect and having the activities respond to the broadcast messages. You can get it here: https://github.com/ksmiller99/HelloIOIOServiceIPC 

If anyone has any suggestions on how to make it better, please reply. The two activities are nearly the same except that the Main starts the service. I did this for simplicity and clarity - even the line numbers are the same in the two activities.

Kevin