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‎.gitignore

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.idea/gradle.xml
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.idea/dictionaries
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.idea/libraries
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.idea/
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# Keystore files
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*.jks

‎.idea/caches/build_file_checksums.ser

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‎app/src/main/java/com/github/donglua/epoxy/more/demo/DemoActivity.java

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import android.support.v7.app.AppCompatActivity;
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import android.os.Bundle;
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import android.support.v7.widget.LinearLayoutManager;
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import android.support.v7.widget.RecyclerView;
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public class DemoActivity extends AppCompatActivity {
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private DemoEpoxyController demoEpoxyController;
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private LoadMoreRecyclerViewScrollListener loadMoreScrollListener;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
@@ -13,9 +16,42 @@ protected void onCreate(Bundle savedInstanceState) {
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RecyclerView recyclerView = findViewById(R.id.recycler_view);
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DemoEpoxyController demoEpoxyController = new DemoEpoxyController();
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final LinearLayoutManager layoutManager = new LinearLayoutManager(this);
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recyclerView.setLayoutManager(layoutManager);
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loadMoreScrollListener = new LoadMoreRecyclerViewScrollListener(layoutManager) {
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@Override
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public void fetchNextPage() {
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fetchNextPageByApi();
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}
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};
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recyclerView.addOnScrollListener(loadMoreScrollListener);
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demoEpoxyController = new DemoEpoxyController(loadMoreScrollListener);
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recyclerView.setAdapter(demoEpoxyController.getAdapter());
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demoEpoxyController.requestModelBuild();
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}
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private void fetchNextPageByApi() {
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new Thread(new Runnable() {
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@Override
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public void run() {
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try {
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Thread.sleep(1000);
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} catch (InterruptedException ignore) { }
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runOnUiThread(new Runnable() {
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@Override
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public void run() {
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demoEpoxyController.nextPzge();
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if (demoEpoxyController.getPage() > 4) {
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loadMoreScrollListener.setHasMoreToLoad(false);
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}
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}
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});
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}
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}).start();
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}
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}

‎app/src/main/java/com/github/donglua/epoxy/more/demo/DemoEpoxyController.java

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package com.github.donglua.epoxy.more.demo;
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import com.airbnb.epoxy.AutoModel;
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import com.airbnb.epoxy.EpoxyController;
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import com.airbnb.epoxy.EpoxyModel;
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public class DemoEpoxyController extends EpoxyController {
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private int page = 1;
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private LoadMoreRecyclerViewScrollListener listener;
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@AutoModel LoadingView_ loadingView;
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public DemoEpoxyController(LoadMoreRecyclerViewScrollListener listener) {
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this.listener = listener;
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}
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@Override
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protected void buildModels() {
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int count = 0;
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for (int i = 0; i < 20; i++) {
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++count;
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new DemoItemView_().id(i).text("Item " + count).addTo(this);
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for (int i = 0; i < page; i++) {
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for (int j = 0; j < 20; j++) {
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++count;
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new DemoItemView_().id(count).text("Item " + count).addTo(this);
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}
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}
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loadingView.addIf(new EpoxyModel.AddPredicate() {
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@Override
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public boolean addIf() {
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return listener.hasMoreToLoad();
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}
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}, this);
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}
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void nextPzge() {
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++page;
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requestModelBuild();
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}
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public int getPage() {
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return page;
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}
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}

‎app/src/main/java/com/github/donglua/epoxy/more/demo/DemoItemView.java

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package com.github.donglua.epoxy.more.demo;
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3-
import android.content.Context;
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import android.support.annotation.NonNull;
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import android.view.View;
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import android.widget.TextView;

‎app/src/main/java/com/github/donglua/epoxy/more/demo/EndlessRecyclerViewScrollListener.java

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package com.github.donglua.epoxy.more.demo;
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import android.support.v7.widget.GridLayoutManager;
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import android.support.v7.widget.LinearLayoutManager;
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import android.support.v7.widget.RecyclerView;
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import android.support.v7.widget.StaggeredGridLayoutManager;
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/**
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* @See https://gist.github.com/nesquena/d09dc68ff07e845cc622
10+
*/
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public abstract class EndlessRecyclerViewScrollListener extends RecyclerView.OnScrollListener {
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// The minimum amount of items to have below your current scroll position
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// before loading more.
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private int visibleThreshold = 5;
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// The current offset index of data you have loaded
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private int currentPage = 0;
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// The total number of items in the dataset after the last load
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private int previousTotalItemCount = 0;
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// True if we are still waiting for the last set of data to load.
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private boolean loading = true;
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// Sets the starting page index
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private int startingPageIndex = 0;
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private RecyclerView.LayoutManager mLayoutManager;
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public EndlessRecyclerViewScrollListener(LinearLayoutManager layoutManager) {
27+
this.mLayoutManager = layoutManager;
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}
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public EndlessRecyclerViewScrollListener(GridLayoutManager layoutManager) {
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this.mLayoutManager = layoutManager;
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visibleThreshold = visibleThreshold * layoutManager.getSpanCount();
33+
}
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35+
public EndlessRecyclerViewScrollListener(StaggeredGridLayoutManager layoutManager) {
36+
this.mLayoutManager = layoutManager;
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visibleThreshold = visibleThreshold * layoutManager.getSpanCount();
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}
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40+
public int getLastVisibleItem(int[] lastVisibleItemPositions) {
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int maxSize = 0;
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for (int i = 0; i < lastVisibleItemPositions.length; i++) {
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if (i == 0) {
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maxSize = lastVisibleItemPositions[i];
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}
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else if (lastVisibleItemPositions[i] > maxSize) {
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maxSize = lastVisibleItemPositions[i];
48+
}
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}
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return maxSize;
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}
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// This happens many times a second during a scroll, so be wary of the code you place here.
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// We are given a few useful parameters to help us work out if we need to load some more data,
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// but first we check if we are waiting for the previous load to finish.
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@Override
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public void onScrolled(RecyclerView view, int dx, int dy) {
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int lastVisibleItemPosition = 0;
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int totalItemCount = mLayoutManager.getItemCount();
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if (mLayoutManager instanceof StaggeredGridLayoutManager) {
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int[] lastVisibleItemPositions = ((StaggeredGridLayoutManager) mLayoutManager).findLastVisibleItemPositions(null);
63+
// get maximum element within the list
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lastVisibleItemPosition = getLastVisibleItem(lastVisibleItemPositions);
65+
} else if (mLayoutManager instanceof GridLayoutManager) {
66+
lastVisibleItemPosition = ((GridLayoutManager) mLayoutManager).findLastVisibleItemPosition();
67+
} else if (mLayoutManager instanceof LinearLayoutManager) {
68+
lastVisibleItemPosition = ((LinearLayoutManager) mLayoutManager).findLastVisibleItemPosition();
69+
}
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71+
// If the total item count is zero and the previous isn't, assume the
72+
// list is invalidated and should be reset back to initial state
73+
if (totalItemCount < previousTotalItemCount) {
74+
this.currentPage = this.startingPageIndex;
75+
this.previousTotalItemCount = totalItemCount;
76+
if (totalItemCount == 0) {
77+
this.loading = true;
78+
}
79+
}
80+
// If it’s still loading, we check to see if the dataset count has
81+
// changed, if so we conclude it has finished loading and update the current page
82+
// number and total item count.
83+
if (loading && (totalItemCount > previousTotalItemCount)) {
84+
loading = false;
85+
previousTotalItemCount = totalItemCount;
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}
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// If it isn’t currently loading, we check to see if we have breached
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// the visibleThreshold and need to reload more data.
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// If we do need to reload some more data, we execute onLoadMore to fetch the data.
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// threshold should reflect how many total columns there are too
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if (!loading && (lastVisibleItemPosition + visibleThreshold) > totalItemCount) {
93+
currentPage++;
94+
onLoadMore(currentPage, totalItemCount, view);
95+
loading = true;
96+
}
97+
}
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// Call this method whenever performing new searches
100+
public void resetState() {
101+
this.currentPage = this.startingPageIndex;
102+
this.previousTotalItemCount = 0;
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this.loading = true;
104+
}
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106+
// Defines the process for actually loading more data based on page
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public abstract void onLoadMore(int page, int totalItemsCount, RecyclerView view);
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}

‎app/src/main/java/com/github/donglua/epoxy/more/demo/LoadMoreListener.java

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package com.github.donglua.epoxy.more.demo;
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public interface LoadMoreListener {
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boolean hasMoreToLoad();
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void fetchNextPage();
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}

‎app/src/main/java/com/github/donglua/epoxy/more/demo/LoadMoreRecyclerViewScrollListener.java

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package com.github.donglua.epoxy.more.demo;
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import android.support.v7.widget.GridLayoutManager;
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import android.support.v7.widget.LinearLayoutManager;
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import android.support.v7.widget.RecyclerView;
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import android.support.v7.widget.StaggeredGridLayoutManager;
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public abstract class LoadMoreRecyclerViewScrollListener extends EndlessRecyclerViewScrollListener implements LoadMoreListener {
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private boolean isHasMoreToLoad = true;
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public LoadMoreRecyclerViewScrollListener(LinearLayoutManager layoutManager) {
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super(layoutManager);
14+
}
15+
16+
public LoadMoreRecyclerViewScrollListener(GridLayoutManager layoutManager) {
17+
super(layoutManager);
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}
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public LoadMoreRecyclerViewScrollListener(StaggeredGridLayoutManager layoutManager) {
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super(layoutManager);
22+
}
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@Override
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public void onLoadMore(int page, int totalItemsCount, RecyclerView view) {
26+
if (hasMoreToLoad()) {
27+
fetchNextPage();
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}
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}
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31+
@Override
32+
public boolean hasMoreToLoad() {
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return isHasMoreToLoad;
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}
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public void setHasMoreToLoad(boolean hasMore) {
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isHasMoreToLoad = hasMore;
38+
}
39+
}

‎app/src/main/java/com/github/donglua/epoxy/more/demo/LoadingView.java

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package com.github.donglua.epoxy.more.demo;
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import android.view.View;
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import com.airbnb.epoxy.EpoxyModel;
6+
import com.airbnb.epoxy.EpoxyModelClass;
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8+
@EpoxyModelClass(layout = R.layout.item_loading)
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public abstract class LoadingView extends EpoxyModel<View> {
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}

‎app/src/main/res/layout/item_loading.xml

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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:orientation="horizontal"
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android:gravity="center"
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android:padding="16dp">
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<ProgressBar
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android:layout_width="32dp"
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android:layout_height="32dp" />
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</LinearLayout>

‎app/src/main/res/layout/item_text.xml

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android:orientation="vertical"
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android:id="@+id/textView"
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android:padding="16dp"
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android:background="@android:color/white"
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android:gravity="center_vertical"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"

‎build.gradle

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}
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dependencies {
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classpath 'com.android.tools.build:gradle:3.1.2'
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// NOTE: Do not place your application dependencies here; they belong
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// in the individual module build.gradle files
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}
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}
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