CODEWITHSUNDEEP
androidlistenerontouchlistener
Phil
Phil

Reputation: 49

Android - Problem detecting onTouchListener

So I have a customdrawableview applied to my activity.

I'm trying to implement a motion listen to the view so that I can detect different touch events in different locations. However, I don't seem to even get a response from Touch Down.

Here's the relevant part of my code:

public class CustomDrawableView extends View implements OnTouchListener
{      
    public CustomDrawableView(Context context)
    {
        super(context);         
    }

    @Override
    protected void onDraw(Canvas canvas)
    {
        super.onDraw(canvas);
        mDrawBackGround(canvas);
        mDrawHexPanel(canvas);
        mDrawHuePanel(canvas);
        mDrawGreyScaleHexPanel(canvas);
        mDrawHuePointer(canvas);
    }

    @Override
    public boolean onTouch(View CustomDrawableView, MotionEvent event) 
    {
        float touchX = event.getX();
        float touchY = event.getY();

        switch (event.getAction())
        {
            case MotionEvent.ACTION_DOWN:


                    pointerTouch=true;
                    cpRed=255;
                    cpGreen=108;
                    cpBlue=0;                           
                    invalidate();                       
                    break;
        }
        return true;
    }

So what am I doing wrong?

Upvotes: 3

Views: 1982

Answers (3)

Iulius Curt
Iulius Curt

Reputation: 5104

Add the listener registration in the constructor of the CustomDrawableView class

Upvotes: 0

Flo
Flo

Reputation: 27455

At the moment your class only implements the interface. You have to register the OnTouchListener to your view by calling this.setOnLongClickListener(this).

Upvotes: 0

Marcos Vasconcelos
Marcos Vasconcelos

Reputation: 18276

To get multi-touch events, you should use the methods getX(int pointer) and getY(int pointer) which returns the position of each touch point.

You can know how many fingers are on screen with the method getPointerCount().

(Methods from the MotionEvent)

Also, the ACTION_DOWN are fired only when the finger touch for the first time, if it's drag, the next events are going to be ACTION_MOVE.

You are overriding onTouch(View arg0, MotionEvent arg1), but to listen the touch events from the View you are creating, you should override onTouchEvent(MotionEvent evt).

Upvotes: 1

Related Questions