Back to project page AndroidGridImageSearch.
The source code is released under:
MIT License
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package net.julienlecomte.gridimagesearch; /*w w w.j a v a 2s.c o m*/ import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; public abstract class EndlessScrollListener implements OnScrollListener { // The minimum amount of items to have below your current scroll position // before loading more. protected int visibleThreshold = 5; // The current offset index of data you have loaded protected int currentPage = 0; // The total number of items in the data-set after the last load protected int previousTotalItemCount = 0; // True if we are still waiting for the last set of data to load. protected boolean loading = true; // Sets the starting page index protected int startingPageIndex = 0; public EndlessScrollListener() {} public EndlessScrollListener(int visibleThreshold) { this.visibleThreshold = visibleThreshold; } public EndlessScrollListener(int visibleThreshold, int startPage) { this.visibleThreshold = visibleThreshold; this.startingPageIndex = startPage; this.currentPage = startPage; } @Override public void onScrollStateChanged(AbsListView view, int scrollState) {} @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { // If the total item count is zero and the previous isn't, assume the // list is invalidated and should be reset back to initial state if (totalItemCount < previousTotalItemCount) { this.currentPage = this.startingPageIndex; this.previousTotalItemCount = totalItemCount; if (totalItemCount == 0) { this.loading = true; } } // If its still loading, we check to see if the data-set count has // changed, if so we conclude it has finished loading and update the // current page number and total item count. if (loading && (totalItemCount > previousTotalItemCount)) { loading = false; previousTotalItemCount = totalItemCount; currentPage++; } // If it isnt currently loading, we check to see if we have breached // the visibleThreshold and need to reload more data. if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) { onLoadMore(currentPage + 1, totalItemCount); loading = true; } } // Defines the process for actually loading more data based on page public abstract void onLoadMore(int page, int totalItemsCount); }