Stop ScrollView from auto-scrolling to an EditText

Question

Seems to be a common problem without a great solution that I have found. Goal is to stop a ScrollView from auto-scrolling to an EditText (or any vi

Answer 1

Create a custom ScrollView (create a class and have it extend HorizontalScrollView) and make a getter setter for scrollable. Then override computeScrollDeltaToGetChildRectOnScreen.

How it works: Every time android has an edit text or something in focus that is off screen it calls method computeScrollDeltaToGetChildRectOnScreen to bring it into view. If you Override it and return 0 when it is disabled than it will not scroll...

So you will have A custom scroll view like this:

    public class TrackableHorizontalScrollView extends HorizontalScrollView {


    // true if we can scroll (not locked)
    // false if we cannot scroll (locked)
    private boolean mScrollable = true;

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

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

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

    public void setScrollingEnabled(boolean enabled) {
        mScrollable = enabled;
    }

    public boolean isScrollable() {
        return mScrollable;
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                // if we can scroll pass the event to the superclass
                if (mScrollable) return super.onTouchEvent(ev);
                // only continue to handle the touch event if scrolling enabled
                return mScrollable; // mScrollable is always false at this point
            default:
                return super.onTouchEvent(ev);
        }
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        // Don't do anything with intercepted touch events if
        // we are not scrollable
        if (!mScrollable) return false;
        else return super.onInterceptTouchEvent(ev);
    }

    @Override
    public void scrollTo(int x, int y){
        if (!mScrollable) return;
        super.scrollTo(x, y);
    }


    //Custom smooth scroll method since norm is final and cannot be overridden
    public final void smooothScrollToIfEnabled(int x, int y){
         if (!mScrollable) return;
         smoothScrollTo(x, y);
    }

    @Override
    protected int computeScrollDeltaToGetChildRectOnScreen(android.graphics.Rect rect){
        if (!mScrollable) return 0;
        return super.computeScrollDeltaToGetChildRectOnScreen(rect);
    }


}

You can use this inside your XML like this: