listview - Android ListView 滚动到底部时动态加载更多项目(来自 MysqlDatabase)

Question

如何在滚动时检测列表末尾并触发将更多数据从 WEB 请求加载到 ListView

如果您正在从 WEB 服务器加载数据并且列表很大，那么实际的解决方案是加载一定量，如果用户滚动到列表末尾，则加载更多数据并继续，直到加载完毕完整列表

Answer 1

您可以将分页监听器添加到 ListView:1. 实现AbsListView.OnScrollListener，例如您可以创建

抽象类InfiniteListViewPaging

 public abstract class InfiniteListViewPaging implements AbsListView.OnScrollListener {

    private static final String TAG = InfiniteListViewPaging.class.getName();
    public ListView mListView;
    public View mFooterView;
    private boolean mCanLoadMore;
    private boolean mIsLoading;

    /**
     * Should be created before setting the adapter on the {@code listView} as this sets the
     * {@link android.widget.ListView#addFooterView(android.view.View)} on it.
     * @param context
     * @param listView
     */
    public InfiniteListViewPaging(Context context, ListView listView) {
        mFooterView = View.inflate(context, R.layout.footer_list_view, null);
        mListView = listView;
        listView.addFooterView(mFooterView, null, false);
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {

    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
                         int totalItemCount) {
        boolean lessThanOneScreenLeftToScrollDown = (totalItemCount - 2 * visibleItemCount) <= firstVisibleItem;
        if (mCanLoadMore && !mIsLoading && lessThanOneScreenLeftToScrollDown) {
            Log.d(TAG, "Load Next Page!");
            mIsLoading = true;
            loadMore();
        }
    }

    public void setCanLoadMore(boolean canLoadMore) {
        mCanLoadMore = canLoadMore;
        mFooterView.setVisibility(canLoadMore ? View.VISIBLE : View.GONE);
    }

    public abstract void loadMore();

    public void hasFinishedLoading() {
        mIsLoading = false;
    }

然后在你的Activity(或Fragment)中，初始化ListView时设置

mListPaging = new InfiniteListViewPaging(this, getListView()) {
                    @Override
                  public void loadMore() {
                       loadMore();
                   } 
}; 
mListView.setOnScrollListener(mListPaging);