This layout file defines the skeleton of our single list item. I have saved this file as my_list.xml. So of this code example to work you will need to have an image in your drawable folder to display it.
In my example below I will use image as an element in a ListView, but this can be any other UI element or even a view with other elements on it.Īlso, this example uses images added to res/drawable folder. Change color to white, and save the xml in the drawable folder.In this Kotlin programming tutorial I will share with you how to use ListView to display list of images. This will give us the plus material icon. Right-click the res folder and select New > Vector Asset.Ĭlick the Button and search for the keyword add: This will cause the list to refresh with the new item we’ve inserted (at index 0) Aside: creating a plus icon with Asset StudioĪs the final touchup, we’ll update the FAB’s icon, using Android Studio’s Asset Studio, for creating a vector material icon. Notice the call to recyclerViewAdapter.notifyItemInserted(0).
After getting filePath we call PictureContent.loadImage, which adds it to our list. This is the (quite verbose) way of getting the downloaded file name when the download manager completes the download. registerReceiver (onComplete, new IntentFilter ( DownloadManager. Public class MyItemRecyclerViewAdapter extends RecyclerView. In content_scrolling.xml replace the TextView with:įinally, in MyItemRecyclerViewAdapter, replace the content to bind our new data fields to our new views: Now we need to add the fragment we created to our activity. We’ll replace those with our picture items.įragment_item_list.xml - contains the RecyclerView widget.įragment_item.xml - layout of each item in the list. ItemFragment - The fragment that holds and initializes the adapter.ĭummy/Dumm圜ontent - Dummy items for populating the list. MyItemRecyclerViewAdapter - Creates the view holder which, well, holds the views for items in the list and binds the data to the views inside the view holder. This creates a RecyclerView with lots of boilerplate code. Right click on the project folder -> add -> fragment (list) -> finish When creating the project, we’ll choose to add a scrolling activity for this example, but you can choose any layout you want. Make a new project (or open an existing one). Seeing as the RecyclerView sample app is outdated and doesn’t even compile, this tutorial aims to show a relatively quick way to add a RecyclerView to modern Android Studio projects, and use it to display a list of random images we’ll download to our device. It manages and optimizes the view holder bindings according to the scrolling position, and recycles the views so that it uses only a small number of views for a large number of list items. The RecyclerView widget is a more advanced and flexible version of ListView.
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