MapView in a ViewPager don't scroll horizontally

Issue Type

[x] Bug [x] Improvement

Description

A MapView in a ViewPager can’t scroll horizontally because the ViewPager intercept the scroll gesture and swipe the views. Note that vertical scrolling works fine.

After searching around a solution was found by adding two lines in the onTouchEvent() method:

@Override
public boolean onTouchEvent(MotionEvent event) {
	// Prevent  the ViewPager to swipe its views
	// See https://stackoverflow.com/questions/8594361/horizontal-scroll-view-inside-viewpager
	if (event.getAction() == MotionEvent.ACTION_MOVE && getParent() != null) {
		getParent().requestDisallowInterceptTouchEvent(true);
	}
	return false;
} 

This could be enhanced by detecting (in an ACTION_DOWN) that the user initiate the scroll near the left or right border and then not calling requestDisallowInterceptTouchEvent(true) in that case.

This was suggested here

My 2 cents Yves

[ycuicui]

I use 5% of map width for left limit and 95% for right limit

Sorry just saw i made a mistake in the above code. Should be read as:

// true if we intercep MOVE events in order to prevent the view pager to swipe views
private boolean intercepMove = false;

@Override
public boolean onTouchEvent(MotionEvent event) {
	// Prevent  the ViewPager to swipe instead of scrolling
	// See https://stackoverflow.com/questions/8594361/horizontal-scroll-view-inside-viewpager
	// Touching the borders allow the view pager to swipe
	switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			// See if we touch the screen borders
			intercepMove = 100 * event.getX() > 5 * getWidth() && 100 * event.getX() < 95 * getWidth();
			break;
		case MotionEvent.ACTION_MOVE:
			if (intercepMove && getParent() != null) {
				getParent().requestDisallowInterceptTouchEvent(true);
			}
	}
	return false;
}

Sorry.

[spyhunter99]

looks great! i’ll add it to the wiki