React Native: Resize custom UI component

After a couple of days of searching, I finally found the answer in this old reported issue in React Native's repo.

This solution is the same as the ones used in ReactPicker.java and ReactToolbar.java. I had to put the following code in my CustomComponent and after that there is no need to even call requestLayout() or invalidate(). The changes are propagated as soon as I update my layout's LayoutParams.

@Override
public void requestLayout() {
    super.requestLayout();

    // The spinner relies on a measure + layout pass happening after it calls requestLayout().
    // Without this, the widget never actually changes the selection and doesn't call the
    // appropriate listeners. Since we override onLayout in our ViewGroups, a layout pass never
    // happens after a call to requestLayout, so we simulate one here.
    post(measureAndLayout);
}

private final Runnable measureAndLayout = new Runnable() {
    @Override
    public void run() {
        measure(MeasureSpec.makeMeasureSpec(getWidth(), MeasureSpec.EXACTLY),
                MeasureSpec.makeMeasureSpec(getHeight(), MeasureSpec.EXACTLY));
        layout(getLeft(), getTop(), getRight(), getBottom());
    }
};