Question

I have a SeekBar inside a HorizontalScrollView and am finding it very hard to grab the handle and move it. If I don’t touch exactly on the handle, the HorizontalScrollView will receive and consume the touch event. Is there a way to increase the priority of the SeekBar so it will have the normal “range” for touch events or is this just a bad idea/design and I should avoid it?

Answer 1

I “solved” it by doing the following:

NOTE: My scroll layout is lockable, as explained here: https://stackoverflow.com/a/5763815/1067721 (just pay atention to my answer a little bit lower, I found that bit to be important)

I then wrapped my seekbar in a FrameLayout able to intercept touch events:

public class InterceptFrameLayout extends FrameLayout {

    private OnTouchListener mListener;

    public InterceptFrameLayout(Context context) {
        super(context);
    }

    public InterceptFrameLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public InterceptFrameLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public boolean onInterceptTouchEvent (MotionEvent ev) {
        return onTouchEvent(ev);
    }

    @Override
    public void setOnTouchListener (View.OnTouchListener l) {
        mListener = l;
    }

    @Override
    public boolean onTouchEvent (MotionEvent ev) {
        if (mListener != null) {
            return mListener.onTouch(this, ev);
        } else {
            return super.onTouchEvent(ev);
        }
    }
}

And then, on my Fragment, I implemented the listener and let the SeekBar consume the event:

    volWrapper.setOnTouchListener(new OnTouchListener() {           
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN: {
                    mHostingScroll.setScrollable(false);
                    break;
                }
                case MotionEvent.ACTION_UP: {
                    mHostingScroll.setScrollable(true);
                    break;
                }
            }
            return volumeBar.onTouchEvent(event);
        }
    });