android使用PullToRefresh实现下拉刷新和上拉加载

<com.handmark.pulltorefresh.library.PullToRefreshExpandableListView 
  android:id="@+id/expand_list" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" /> 

mExpandList = (PullToRefreshExpandableListView) rootView.findViewById(R.id.expand_list); 
mExpandList.getRefreshableView().setGroupIndicator(null); 
mExpandList.getRefreshableView().setDivider(null); 
mExpandList.getRefreshableView().setSelector(android.R.color.transparent); 
mExpandList.getRefreshableView().setOnGroupClickListener(this); 
mExpandList.setOnRefreshListener(this); 

@Override 
public void onRefresh(PullToRefreshBase<ExpandableListView> refreshView) { 
  if (!isRefreshing) { 
    isRefreshing = true; 
    updateList(true); 
  } else { 
    mExpandList.onRefreshComplete(); 
  } 
} 

// set mode to BOTH 
mExpandList.setMode(Mode.BOTH); 
mExpandList.getLoadingLayoutProxy(false, true).setPullLabel(getString(R.string.pull_to_load)); 
mExpandList.getLoadingLayoutProxy(false, true).setRefreshingLabel(getString(R.string.loading)); 
mExpandList.getLoadingLayoutProxy(false, true).setReleaseLabel(getString(R.string.release_to_load)); 

public boolean isHeaderShown() { 
  return getHeaderLayout().isShown(); 
} 
 
public boolean isFooterShown() { 
  return getFooterLayout().isShown(); 
} 

@Override 
public void onRefresh(PullToRefreshBase<ExpandableListView> refreshView) { 
  if (!isRefreshing) { 
    isRefreshing = true; 
    if (mExpandList.isHeaderShown()) { 
      Utils.LOGD("pull-to-refresh"); 
      refreshOnlineStatus(true); 
    } else if (mExpandList.isFooterShown()) { 
      Utils.LOGD("pull-to-load-more"); 
      loadNextPage(); 
    } 
  } else { 
    mExpandList.onRefreshComplete(); 
  } 
}