singletap touch detect in Ontouch method of the view

Question

I needed a singletap touch detect in my custom view's ontouch method. I tried getting the x and y values in both ACTION-DOWN and ACTION-UP and in ACTION-UP I gave a condition that if a the values of X and Y in ACTIONDOWN and ACTION-UP are equal then take it as a single tap.

My code is as follows

@Override
public boolean onTouchEvent(MotionEvent ev) {
   if (!mSupportsZoom && !mSupportsPan) return false;

    mScaleDetector.onTouchEvent(ev);

    final int action = ev.getAction();
    switch (action & MotionEvent.ACTION_MASK) {
    case MotionEvent.ACTION_DOWN: {
        final float x = ev.getX();
        final float y = ev.getY();

        mLastTouchX = x;  //here i get x and y values in action down
        mLastTouchY = y;
        mActivePointerId = ev.getPointerId(0);

        break;
    }

    case MotionEvent.ACTION_MOVE: {
        final int pointerIndex = ev.findPointerIndex(mActivePointerId);
        final float x = ev.getX(pointerIndex);
        final float y = ev.getY(pointerIndex);

        if (mSupportsPan && !mScaleDetector.isInProgress()) {
            final float dx = x - mLastTouchX;
            final float dy = y - mLastTouchY;

            mPosX += dx;
            mPosY += dy;
            //mFocusX = mPosX;
            //mFocusY = mPosY;

            invalidate();
        }

        mLastTouchX = x;
        mLastTouchY = y;

        break;
    }

    case MotionEvent.ACTION_UP: {

        final float x = ev.getX();
        final float y = ev.getY();

        touchupX=x;   //here is get x and y values at action up
        touchupY=y; 

        if(mLastTouchX == touchupX && mLastTouchY == touchupY){  //my condition if both the x and y values are same .

            PinchZoomPanActivity2.tapped1(this.getContext(), 100); //my method if the singletap is detected

        }
        else{

        }

        mActivePointerId = INVALID_POINTER_ID;

        break;
    }

    case MotionEvent.ACTION_CANCEL: {
        mActivePointerId = INVALID_POINTER_ID;
        break;
    }

    case MotionEvent.ACTION_POINTER_UP: {
        final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) 
                >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
        final int pointerId = ev.getPointerId(pointerIndex);
        if (pointerId == mActivePointerId) {

            final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
            mLastTouchX = ev.getX(newPointerIndex);
            mLastTouchY = ev.getY(newPointerIndex);
            mActivePointerId = ev.getPointerId(newPointerIndex);
        }
        break;
    }
    }

    return true;
}

but I cant get it done. I mean at every action up my method is called. even when the x and y values of both actionup and actiondown are not same. and I think I also need to put some range to the singletap as we touch with our finger on the screen. Can anyone suggest me some ways?

Answer 1

To detect Single and Double Tap in android I am using the following methods :

class GestureTap extends GestureDetector.SimpleOnGestureListener {
    @Override
    public boolean onDoubleTap(MotionEvent e) {
        Log.i("onDoubleTap :", "" + e.getAction());
        return true;
   }

    @Override
    public boolean onSingleTapConfirmed(MotionEvent e) {
        Log.i("onSingleTap :", "" + e.getAction());
        return true;
    }
}

Use it in constructor of GestureDetector :

detector = new GestureDetector(this, new GestureTap());

And add the following code in onTouch listener

@Override
public boolean onTouchEvent(MotionEvent event) {

    detector.onTouchEvent(event);

    return true;
}