Package com.bumptech.glide.integration.recyclerview

Class RecyclerViewPreloader<T>

java.lang.Object
androidx.recyclerview.widget.RecyclerView.OnScrollListener
com.bumptech.glide.integration.recyclerview.RecyclerViewPreloader<T>
Type Parameters:
T - The type of the model being displayed in the RecyclerView.
public final class RecyclerViewPreloader<T> extends androidx.recyclerview.widget.RecyclerView.OnScrollListener
Loads a few resources ahead in the direction of scrolling in any RecyclerView so that images are in the memory cache just before the corresponding view in created in the list. Gives the appearance of an infinitely large image cache, depending on scrolling speed, cpu speed, and cache size.

Must be added as a listener to the RecyclerView using RecyclerView.addOnScrollListener(RecyclerView.OnScrollListener), or have its corresponding methods called from another RecyclerView.OnScrollListener to function.

This class only works with LinearLayoutManager and subclasses of LinearLayoutManager.

  • Constructor Summary

    Constructors
    Constructor
    Description
    RecyclerViewPreloader(Activity activity, com.bumptech.glide.ListPreloader.PreloadModelProvider<T> preloadModelProvider, com.bumptech.glide.ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload)
    Helper constructor that accepts an Activity.
    RecyclerViewPreloader(Fragment fragment, com.bumptech.glide.ListPreloader.PreloadModelProvider<T> preloadModelProvider, com.bumptech.glide.ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload)
    Deprecated.
    Use constructor RecyclerViewPreloader(Fragment, PreloadModelProvider, PreloadSizeProvider) instead.
    RecyclerViewPreloader(androidx.fragment.app.FragmentActivity fragmentActivity, com.bumptech.glide.ListPreloader.PreloadModelProvider<T> preloadModelProvider, com.bumptech.glide.ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload)
    Helper constructor that accepts an FragmentActivity.
    RecyclerViewPreloader(androidx.fragment.app.Fragment fragment, com.bumptech.glide.ListPreloader.PreloadModelProvider<T> preloadModelProvider, com.bumptech.glide.ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload)
    Helper constructor that accepts an Fragment.
    RecyclerViewPreloader(com.bumptech.glide.RequestManager requestManager, com.bumptech.glide.ListPreloader.PreloadModelProvider<T> preloadModelProvider, com.bumptech.glide.ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload)
    Constructor that accepts interfaces for providing the dimensions of images to preload, the list of models to preload for a given position, and the request to use to load images.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    onScrolled(androidx.recyclerview.widget.RecyclerView recyclerView, int dx, int dy)
     

    Methods inherited from class androidx.recyclerview.widget.RecyclerView.OnScrollListener

    onScrollStateChanged

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • RecyclerViewPreloader

      public RecyclerViewPreloader(@NonNull Activity activity, @NonNull com.bumptech.glide.ListPreloader.PreloadModelProvider<T> preloadModelProvider, @NonNull com.bumptech.glide.ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload)
      Helper constructor that accepts an Activity.

    • RecyclerViewPreloader

      public RecyclerViewPreloader(@NonNull androidx.fragment.app.FragmentActivity fragmentActivity, @NonNull com.bumptech.glide.ListPreloader.PreloadModelProvider<T> preloadModelProvider, @NonNull com.bumptech.glide.ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload)
      Helper constructor that accepts an FragmentActivity.

    • RecyclerViewPreloader

      public RecyclerViewPreloader(@NonNull androidx.fragment.app.Fragment fragment, @NonNull com.bumptech.glide.ListPreloader.PreloadModelProvider<T> preloadModelProvider, @NonNull com.bumptech.glide.ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload)
      Helper constructor that accepts an Fragment.

    • RecyclerViewPreloader

      @Deprecated public RecyclerViewPreloader(@NonNull Fragment fragment, @NonNull com.bumptech.glide.ListPreloader.PreloadModelProvider<T> preloadModelProvider, @NonNull com.bumptech.glide.ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload)
      Deprecated.
      Use constructor RecyclerViewPreloader(Fragment, PreloadModelProvider, PreloadSizeProvider) instead.
      Helper constructor that accepts an Fragment.

    • RecyclerViewPreloader

      public RecyclerViewPreloader(@NonNull com.bumptech.glide.RequestManager requestManager, @NonNull com.bumptech.glide.ListPreloader.PreloadModelProvider<T> preloadModelProvider, @NonNull com.bumptech.glide.ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload)
      Constructor that accepts interfaces for providing the dimensions of images to preload, the list of models to preload for a given position, and the request to use to load images.
      Parameters:
      preloadModelProvider - Provides models to load and requests capable of loading them.
      preloadDimensionProvider - Provides the dimensions of images to load.
      maxPreload - Maximum number of items to preload.

  • Method Details

    • onScrolled

      public void onScrolled(androidx.recyclerview.widget.RecyclerView recyclerView, int dx, int dy)
      Overrides:
      onScrolled in class androidx.recyclerview.widget.RecyclerView.OnScrollListener