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 and Description
RecyclerViewPreloader(android.app.Activity activity, ListPreloader.PreloadModelProvider<T> preloadModelProvider, ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload) Helper constructor that accepts an Activity.
RecyclerViewPreloader(androidx.fragment.app.FragmentActivity fragmentActivity, ListPreloader.PreloadModelProvider<T> preloadModelProvider, ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload) Helper constructor that accepts an FragmentActivity.
RecyclerViewPreloader(androidx.fragment.app.Fragment fragment, ListPreloader.PreloadModelProvider<T> preloadModelProvider, ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload) Helper constructor that accepts an Fragment.
RecyclerViewPreloader(android.app.Fragment fragment, ListPreloader.PreloadModelProvider<T> preloadModelProvider, ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload) Deprecated. Use constructor RecyclerViewPreloader(Fragment, PreloadModelProvider, PreloadSizeProvider) instead.
RecyclerViewPreloader(RequestManager requestManager, ListPreloader.PreloadModelProvider<T> preloadModelProvider, 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 and 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 Detail

RecyclerViewPreloader

public RecyclerViewPreloader(@NonNull
                             android.app.Activity activity,
                             @NonNull
                             ListPreloader.PreloadModelProvider<T> preloadModelProvider,
                             @NonNull
                             ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider,
                             int maxPreload)

Helper constructor that accepts an Activity.

RecyclerViewPreloader

public RecyclerViewPreloader(@NonNull
                             androidx.fragment.app.FragmentActivity fragmentActivity,
                             @NonNull
                             ListPreloader.PreloadModelProvider<T> preloadModelProvider,
                             @NonNull
                             ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider,
                             int maxPreload)

Helper constructor that accepts an FragmentActivity.

RecyclerViewPreloader

public RecyclerViewPreloader(@NonNull
                             androidx.fragment.app.Fragment fragment,
                             @NonNull
                             ListPreloader.PreloadModelProvider<T> preloadModelProvider,
                             @NonNull
                             ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider,
                             int maxPreload)

Helper constructor that accepts an Fragment.

RecyclerViewPreloader

@Deprecated
public RecyclerViewPreloader(@NonNull
                                         android.app.Fragment fragment,
                                         @NonNull
                                         ListPreloader.PreloadModelProvider<T> preloadModelProvider,
                                         @NonNull
                                         ListPreloader.PreloadSizeProvider<T> preloadDimensionProvider,
                                         int maxPreload)

Deprecated. Use constructor RecyclerViewPreloader(Fragment, PreloadModelProvider, PreloadSizeProvider) instead.

Helper constructor that accepts an Fragment.

RecyclerViewPreloader

public RecyclerViewPreloader(@NonNull
                             RequestManager requestManager,
                             @NonNull
                             ListPreloader.PreloadModelProvider<T> preloadModelProvider,
                             @NonNull
                             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 Detail

onScrolled

public void onScrolled(androidx.recyclerview.widget.RecyclerView recyclerView,
                       int dx,
                       int dy)

Overrides:

onScrolled in class androidx.recyclerview.widget.RecyclerView.OnScrollListener