Android Load More ListView

1. LoadMoreListView.class

public class LoadMoreListView extends ListView implements OnScrollListener {

    private static final String TAG = "LoadMoreListView";

    /**

     * Listener that will receive notifications every time the list scrolls.

     */

    private OnScrollListener onScrollListener;

    private LayoutInflater inflater;

    // footer view

    private RelativeLayout footerView;

    // private TextView mLabLoadMore;

    private ProgressBar progressBarLoadMore;

    // Listener to process load more items when user reaches the end of the list

    private OnLoadMoreListener onLoadMoreListener;

    // To know if the list is loading more items

    private boolean isLoadingMore = false;

    private int currentScrollState;

    public LoadMoreListView(Context context) {

        super(context);

        init(context);

    }

    public LoadMoreListView(Context context, AttributeSet attrs) {

        super(context, attrs);

        init(context);

    }

    public LoadMoreListView(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

        init(context);

    }

    private void init(Context context) {

        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        // footer

        footerView = (RelativeLayout) inflater.inflate(R.layout.load_more_footer, this, false);

        /*

         * mLabLoadMore = (TextView) mFooterView .findViewById(R.id.load_more_lab_view);

         */

        progressBarLoadMore = (ProgressBar) footerView.findViewById(R.id.load_more_progressBar);

        addFooterView(footerView);

        super.setOnScrollListener(this);

    }

    @Override

    public void setAdapter(ListAdapter adapter) {

        super.setAdapter(adapter);

    }

    /**

     * Set the listener that will receive notifications every time the list scrolls.

     * 

     * @param l The scroll listener.

     */

    @Override

    public void setOnScrollListener(AbsListView.OnScrollListener l) {

        onScrollListener = l;

    }

    /**

     * Register a callback to be invoked when this list reaches the end (last item be visible)

     * 

     * @param onLoadMoreListener The callback to run.

     */

    public void setOnLoadMoreListener(OnLoadMoreListener onLoadMoreListener) {

        this.onLoadMoreListener = onLoadMoreListener;

    }

    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

        if (onScrollListener != null) {

            onScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);

        }

        if (onLoadMoreListener != null) {

            if (visibleItemCount == totalItemCount) {

                progressBarLoadMore.setVisibility(View.GONE);

                // mLabLoadMore.setVisibility(View.GONE);

                return;

            }

            boolean loadMore = firstVisibleItem + visibleItemCount >= totalItemCount;

            if (!isLoadingMore && loadMore && currentScrollState != SCROLL_STATE_IDLE) {

                progressBarLoadMore.setVisibility(View.VISIBLE);

                // mLabLoadMore.setVisibility(View.VISIBLE);

                isLoadingMore = true;

                onLoadMore();

            }

        }

    }

    public void onScrollStateChanged(AbsListView view, int scrollState) {

        // bug fix: listview was not clickable after scroll

        if (scrollState == OnScrollListener.SCROLL_STATE_IDLE) {

            view.invalidateViews();

        }

        currentScrollState = scrollState;

        if (onScrollListener != null) {

            onScrollListener.onScrollStateChanged(view, scrollState);

        }

    }

    public void onLoadMore() {

        Log.d(TAG, "onLoadMore");

        if (onLoadMoreListener != null) {

            onLoadMoreListener.onLoadMore();

        }

    }

    /**

     * Notify the loading more operation has finished

     */

    public void onLoadMoreComplete() {

        isLoadingMore = false;

        progressBarLoadMore.setVisibility(View.GONE);

    }

    /**

     * Interface definition for a callback to be invoked when list reaches the last item (the user

     * load more items in the list)

     */

    public interface OnLoadMoreListener {

        /**

         * Called when the list reaches the last item (the last item is visible to the user)

         */

        public void onLoadMore();

    }

}

2. Activity to LoadMoreListView

// set a listener to be invoked when the list reaches the end
        ((LoadMoreListView) getListView())
                .setOnLoadMoreListener(new OnLoadMoreListener() {
                    public void onLoadMore() {
                        // Do the work to load more items at the end of list here
                        new LoadDataTask().execute();
                    }
                });


private class LoadDataTask extends AsyncTask<Void, Void, Void> {

        @Override
        protected Void doInBackground(Void... params) {

            if (isCancelled()) {
                return null;
            }

            // Simulates a background task
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
            }

            for (int i = 0; i < mNames.length; i++)
                mListItems.add(mNames[i]);

            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            mListItems.add("Added after load more");

            // We need notify the adapter that the data have been changed
            ((BaseAdapter) getListAdapter()).notifyDataSetChanged();

            // Call onLoadMoreComplete when the LoadMore task, has finished
            ((LoadMoreListView) getListView()).onLoadMoreComplete();

            super.onPostExecute(result);
        }

        @Override
        protected void onCancelled() {
            // Notify the loading more operation has finished
            ((LoadMoreListView) getListView()).onLoadMoreComplete();
        }
    }

3. Layout

<!-- We have to indicate that the listview is now a LoadMoreListView -->

    <com.costum.android.widget.LoadMoreListView
        android:id="@+id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

참고

https://github.com/shontauro/android-pulltorefresh-and-loadmore

android-pulltorefresh-and-loadmore-master.zip