我想使用可扩展列表视图实现下拉刷新和上拉刷新。我正在使用可扩展列表视图。下面是包含可扩展列表视图的 java 代码。
public class LoadMoreListView extends ExpandableListView implements OnScrollListener {
private static final String TAG = "LoadMoreListView";
/**
* Listener that will receive notifications every time the list scrolls.
*/
private OnScrollListener mOnScrollListener;
private LayoutInflater mInflater;
// footer view
private RelativeLayout mFooterView;
// private TextView mLabLoadMore;
private ProgressBar mProgressBarLoadMore;
// Listener to process load more items when user reaches the end of the list
private OnLoadMoreListener mOnLoadMoreListener;
// To know if the list is loading more items
private boolean mIsLoadingMore = false;
private int mCurrentScrollState;
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) {
mInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// footer
mFooterView = (RelativeLayout) mInflater.inflate(
R.layout.load_more_footer, this, false);
/*
* mLabLoadMore = (TextView) mFooterView
* .findViewById(R.id.load_more_lab_view);
*/
mProgressBarLoadMore = (ProgressBar) mFooterView
.findViewById(R.id.load_more_progressBar);
addFooterView(mFooterView);
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) {
mOnScrollListener = 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) {
mOnLoadMoreListener = onLoadMoreListener;
}
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
if (mOnScrollListener != null) {
mOnScrollListener.onScroll(view, firstVisibleItem,
visibleItemCount, totalItemCount);
}
if (mOnLoadMoreListener != null) {
if (visibleItemCount == totalItemCount) {
mProgressBarLoadMore.setVisibility(View.GONE);
// mLabLoadMore.setVisibility(View.GONE);
return;
}
boolean loadMore = firstVisibleItem + visibleItemCount >= totalItemCount;
if (!mIsLoadingMore && loadMore
&& mCurrentScrollState != SCROLL_STATE_IDLE) {
mProgressBarLoadMore.setVisibility(View.VISIBLE);
// mLabLoadMore.setVisibility(View.VISIBLE);
mIsLoadingMore = true;
onLoadMore();
}
}
}
public void onScrollStateChanged(AbsListView view, int scrollState) {
mCurrentScrollState = scrollState;
if (mOnScrollListener != null) {
mOnScrollListener.onScrollStateChanged(view, scrollState);
}
}
public void onLoadMore() {
Log.d(TAG, "onLoadMore");
if (mOnLoadMoreListener != null) {
mOnLoadMoreListener.onLoadMore();
}
}
/**
* Notify the loading more operation has finished
*/
public void onLoadMoreComplete() {
mIsLoadingMore = false;
mProgressBarLoadMore.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();
}
}
下面是我将使用的 Xml 布局文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="15dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:orientation="vertical" >
<ExpandableListView
android:id="@+id/listViewMeeting"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:cacheColorHint="@color/White"
android:listSelector="@color/transprent"
android:groupIndicator="@color/transprent" >
</ExpandableListView>
</LinearLayout>
</LinearLayout>