2/24/2023 0 Comments Horizontal listview android studioThen, we are going to create an adapter that just adds the two extra items. The values we are using for the example are: This allows us to tweak it for different screen sizes and also to be able to read the width in code without the need of waiting for the views to be measured. These layouts have the width defined as a dimension. They are defined in the layout list_item.xml which looks like this: On the other hand, the normal items we are going to use are just a square shape in the background and a number in the center. The layout for the extra items is defined in the layout file list_item_padding.xml and looks like this: The normal ones and the ones we will add at the beginning and the end. The list itemsĪs we mentioned, we will have two different items in the list. First, lets add a style indicating the orientation of the ListView (horizontal or vertical) in (res/values/styles. The width of these extra items need to be large enough for it. We are going to have two extra items in the list, one at the beginning and one at the end, to be able to position the first and last items centered on the screen. This is very important to be able to calculate the center of the screen and which item is the selected one. We will know the with of the items on the list beforehand. Its OnScrollListener does not provide enough information. We are going to use a RecyclerView because the OnScrollListener allows us to know the pixels that have been scrolled, and that is not possible with a standard ListView. You probably want something more detailed, so let’s get into it. The code for this example is available on GitHub as the project SnappingList The detailed solution Then we will check which item is currently in the middle of the screen and make the list scroll until it is positioned on the center. What we will do is to listen for the event of scrolling stop on the list. It is also similar to what you can do with a ViewPager, but those are normally designed for full width Fragments. In old versions of Android we had the Gallery class that allowed us to do something similar, but it has been deprecated. We want to have a horizontal scrolling view that holds several items and that snaps to the selected one once the scroll stops, placing it centered on the screen.Įssentially something that works like this:
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