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Display Collections - Java SDK

On this page

  • Install Adapters
  • Example Models
  • Display Collections in a ListView
  • Display Collections in a RecyclerView

Android apps often populate the UI using RecyclerView or ListView components. Realm offers adapters to display realm object collections. These collections implement the OrderedRealmCollections interface. RealmResults and RealmList are examples of these adaptors. With these adapters, UI components update when your app changes Realm objects.

Install Adapters

Add these dependencies to your application level build.gradle file:

dependencies {
   implementation 'io.realm:android-adapters:4.0.0'
   implementation 'androidx.recyclerview:recyclerview:1.1.0'
}

Realm hosts these adapters on the JCenter artifact repository. To use jcenter in your Android app, add it to your project-level build.gradle file:

buildscript {
    repositories {
        jcenter()
    }
}
allprojects {
    repositories {
        jcenter()
    }
}

Tip

See also:

Source code: realm/realm-android-adapters on GitHub.

Example Models

The examples on this page use a Realm object named Item. This class contains a string named "name" and an identifier number named "id":

Display Collections in a ListView

Display Realm objects in a ListView by extending RealmBaseAdapter. The adapter uses the ListAdapter interface. Implementation works like any ListAdapter. This provides support for automatically-updating Realm objects.

Subclass RealmBaseAdapter to display Item objects in a ListView:

Display Collections in a RecyclerView

Display Realm objects in a RecyclerView by extending RealmRecyclerViewAdapter. The adapter extends RecyclerView.Adapter. Implementation works like any RecyclerView adapter. This provides support for automatically-updating Realm objects.

Subclass RealmRecyclerViewAdapter to display Item objects in a RecyclerView:

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