Android library for creating simple pagination functionality (aka infinite scrolling) upon RecyclerView or AbsListView.

• Configuration allows you to setup automatic adding/removing of the loading list item (enabled by default)
• Custom loading list item - inflate and bind (default loading list item view will be used if custom one is not provided)
• Custom SpanSizeLookup for the loading list item when GridLayoutManager is used (by default loading list item will use full span)
• Custom loading trigger threshold
• Support RecyclerView (using linear, grid and staggered LayoutManager) and AbsListView (ListView | GridView)

For a working implementation of this project see the paginate-sample/ folder.

Gradle:

compile 'com.github.markomilos:paginate:1.0.0'

or Maven:

<dependency>
  <groupId>com.github.markomilos</groupId>
  <artifactId>paginate</artifactId>
  <version>1.0.0</version>
</dependency>

Implement Paginate.Callbacks

Paginate.Callbacks callbacks = new Paginate.Callbacks() {
    @Override
    public void onLoadMore() {
        // Load next page of data (e.g. network or database)
    }

    @Override
    public boolean isLoading() {
        // Indicate whether new page loading is in progress or not
        return loadingInProgress;
    }

    @Override
    public boolean hasLoadedAllItems() {
        // Indicate whether all data (pages) are loaded or not
        return hasLoadedAllItems;
    }
};

RecyclerView

Paginate.with(recyclerView, callbacks)
        .setLoadingTriggerThreshold(2)
        .addLoadingListItem(true)
        .setLoadingListItemCreator(new CustomLoadingListItemCreator())
        .setLoadingListItemSpanSizeLookup(new CustomLoadingListItemSpanLookup())
        .build();

Note: LayoutManager and RecyclerView.Adapter needs to be set before calling the code above.

Implement LoadingListItemCreator in order to provide custom loading row view.

private class CustomLoadingListItemCreator implements LoadingListItemCreator {
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        View view = inflater.inflate(R.layout.custom_loading_list_item, parent, false);
        return new VH(view);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        // Bind custom loading row if needed
    }
}

AbsListView

Paginate.with(absListView, callbacks)
        .setOnScrollListener(scrollListener) // Delegate scroll listener
        .setLoadingTriggerThreshold(2)
        .addLoadingListItem(true)
        .setLoadingListItemCreator(new CustomLoadingListItemCreator())
        .build();

Note: Adapter needs to be set before calling the code above.

Implement LoadingListItemCreator in order to provide custom loading row view.

private class CustomLoadingListItemCreator implements LoadingListItemCreator {
    @Override
    public View newView(int position, ViewGroup parent) {
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        View view = inflater.inflate(R.layout.custom_loading_list_item, parent, false);
        view.setTag(new VH(view));
        return view;
    }

    @Override
    public void bindView(int position, View view) {
        // Bind custom loading row if needed
    }
}

Paginate instance

Calling build() upon Paginate.Builder will return Paginate instance which will allow you to:

• unbind() - Call unbind to detach list (RecyclerView or AbsListView) from Paginate when pagination functionality is no longer needed on the list. Paginate is using scroll listeners and adapter data observers in order to perform required checks (when list is scrolled to the end or when new data is added to source adapter). It wraps original (source) adapter with new adapter that provides loading row if loading row is used. When unbind is called original adapter will be set on the list and scroll listeners and data observers will be detached. You need to call unbind() if you re-setup recycler view (e.g. change adapter, layout manager etc)

• setHasMoreDataToLoad(boolean) - if you are using loading row (which is default setup), each time when you add data to adapter check will be performed and if there is no more data to load loading row will be removed. That means that loading row will be added/removed automatically. Use this method to explicitly (manually) notify that there is no more item to load.

Marko Milos ([email protected])

Copyright 2020 Marko Milos

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.