This can be achieved through the changeIsSelected(int position, boolean value) andĬhangeIsSelected(int position) methods. Then you will need to select them manually through code.

Sometimes it may be useful to have a certain item(s) preselected. The method getSelectionOnTouch() returns the current value. If the value is NEVER, the only way to select an item will be by long press no matter if there are selected items or not. To start the selection first (by long press) before the behaviors starts listening for tap gestures. The default value is AFTER_START which means that you need In order to achieve the above mentioned instant selection on tap, you need to set the mode to ALWAYS. The options are: NEVER, ALWAYS, AFTER_START. It allows you to change the way the tap gesture is treated. Here's when the setSelectionOnTouch(SelectionBehavior.SelectionOnTouch) comes in handy. Need to start a selection by a long press gesture first. In some scenarios, you may need to select an item instantly on tap, without the explicit The difference is that now when you select another item, the previous selection is cleared. Still, long press is required to start the selection mode. Let's change the mode to SINGLE: tSelectionMode() This can be done by the setSelectionMode(SelectionBehavior.SelectionMode) method. The SelectionBehavior can be also used for selection of a single item at a time. Now if you long press an item, it will change its state to show the selection layer. Here's the new content of the city_list_item: Then you may notice that if the selection layer was set as background, the image would look the same way no matter if the item is selected or not.Įven though our layout does not include images, we are going to add a new View for the selection layer for demonstration purposes. The difference will be more visible if your This can be used to add an overlay view that will contain the selection state layer. (or change the default layout if you don't plan to support versions prior API 11). You can add a new layout that will be used when running on a device with API 11 or higher Since API Level 11 the state list drawable doesn't need to be set on the root element. Set this resource as a background of the root element of the layout. In order to target all supported platforms, you need to You simply need to set it as background of the list item layout (in our example that is city_list_item). That is part of the list view resources and is called selectable_item_background.

If you are not familiar with state list drawables you can read more here. However, we have already extended the default list view adapter to CityAdapter and now in order to be able to highlight an item when selected we will need to add a StateListDrawable to our layout that will handle the selected state. ListView.AddBehavior (selectionBehavior)

SelectionBehavior selectionBehavior = new SelectionBehavior () If we were using an instance of the default ListViewAdapter, adding the SelectionBehavior to the list view instance would have been enough to enable the selection: SelectionBehavior selectionBehavior = new SelectionBehavior() The Behaviors Overview we introduced the behaviors and now we will go into more details about the SelectionBehavior.

If you have read the Getting Started page, you already have a project with RadListView which is populated with items of type City. The list view exits the selection mode when all items are de-selected or when the back button is pressed. Once in selection mode,Ī simple tap is enough to change the selection state of each item. Here's how the default settings work: when long press gesture occurs, the list view starts selection mode and the item that was pressed gets selected. When the selection state of an item is changed. It supports single and multiple selection and can provide a notification The SelectionBehavior is responsible for selecting, deselecting and reporting the selection of items in RadListView.

Android studio listview select 1 view