Add the xml layout files for the activity and for the RecyclerView row.Later you can customize it to fit your needs. All you need to do is copy and paste the code in each section. You will perform the following tasks to add the RecyclerView. To do that we could create an EditText with the amount of rows that are selectable so the user can change that number whenever he wants to select more than two items.The following is a minimal example that will look like the following image. Let’s say that we want to change on runtime the amount of items the user can select. There is another way we can recreate the crash that we saw before. Setting that option to true will just tell the RecyclerView that each item in the data set can be represented with a unique identifier of type Long which is exactly what we need. With that in mind, we are going to pick Long and use the position of our list items as their ids, but first, we need the ids to be stable so we will use setHasStableIds for that. Band selection support is not available when using the default long key storage implementation. It comes with some limitations, however, as access to stable ids at runtime is limited. Long: Use Long when RecyclerView's long stable ids are already in use. String: Use String when a string based stable identifier is available. If items in your view are associated with stable content:// uris, you should use Uri for your key type. This is especially useful in conjunction with Uri as the Android URI implementation is both parcelable and makes for a natural stable selection key for values represented by the Android Content Provider framework. Parcelable: Any Parcelable type can be used as the selection key. There are also some guidelines and advice on which type to use depending on your use case. You can use whichever type you like but the selection library provides support for three types: Parcelable, String and Long. The documentation first calls to determine the selection key type to use to then build a KeyProvider.
implementation 'androidx.recyclerview:recyclerview-selection:1.0.0' Step 2: Select a key type The first step is adding the dependency to our gradle.build file.
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