Android SwipeRefreshLayout onRefresh方法不';行不通
我将ListView添加到布局中。但是,onRefresh方法不起作用。listview附带数据,我想滚动listview会阻止onRefresh工作。我使用的方法在第一个项目可见时启用swipeContainer。你能检查一下我的代码并告诉我我做错了什么吗 以下是我的活动:Android SwipeRefreshLayout onRefresh方法不';行不通,android,listview,swiperefreshlayout,Android,Listview,Swiperefreshlayout,我将ListView添加到布局中。但是,onRefresh方法不起作用。listview附带数据,我想滚动listview会阻止onRefresh工作。我使用的方法在第一个项目可见时启用swipeContainer。你能检查一下我的代码并告诉我我做错了什么吗 以下是我的活动: public class TimelineActivity extends Activity { private SwipeRefreshLayout swipeContainer; JSONObject
public class TimelineActivity extends Activity {
private SwipeRefreshLayout swipeContainer;
JSONObject jsonobject;
JSONObject jsonobj;
CityList list;
ArrayList<CityInfo> myList;
SharedPreferences sp;
JSONArray jArray = null;
JSONArray jResult = null;
Object info;
String resultmsg = null;
String json;
ListView theListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
swipeContainer = (SwipeRefreshLayout) findViewById(R.id.swipeContainer);
// Setup refresh listener which triggers new data loading
swipeContainer.setOnRefreshListener(new OnRefreshListener() {
@Override
public void onRefresh() {
// Your code to refresh the list here.
// Make sure you call swipeContainer.setRefreshing(false) when
// once the network request has completed successfully.
Log.i("refresh","refreshing");
new DownloadJSON().execute();
}
});
ViewGroup vg = (ViewGroup) findViewById(R.id.mainlayoutarea);
ViewGroup.inflate(TimelineActivity.this, R.layout.city_list, vg);
setContentView(R.layout.city_list);
theListView = (ListView) findViewById(R.id.cityList);
theListView.setOnScrollListener(new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
boolean enable = false;
if(theListView != null && theListView.getChildCount() > 0){
// check if the first item of the list is visible
boolean firstItemVisible = theListView.getFirstVisiblePosition() == 0;
// check if the top of the first item is visible
boolean topOfFirstItemVisible = theListView.getChildAt(0).getTop() == 0;
// enabling or disabling the refresh layout
enable = firstItemVisible && topOfFirstItemVisible;
}
swipeContainer.setEnabled(enable);
}
});
swipeContainer.setColorSchemeResources(android.R.color.holo_blue_light,
android.R.color.holo_green_light,
android.R.color.holo_orange_light,
android.R.color.holo_red_light);
new DownloadJSON().execute();
}
公共类TimelineActivity扩展活动{
私人swipeContainer;
JSONObject JSONObject;
JSONObject jsonobj;
城市名单;
ArrayList myList;
共享参考sp;
JSONArray-jArray=null;
JSONArray jResult=null;
对象信息;
字符串resultsg=null;
字符串json;
列表视图列表视图;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
swipeContainer=(SwipeRefreshLayout)findViewById(R.id.swipeContainer);
//设置触发新数据加载的刷新侦听器
swipeContainer.setOnRefreshListener(新的OnRefreshListener(){
@凌驾
公共void onRefresh(){
//您的代码将刷新此处的列表。
//确保在以下情况下调用swipeContainer.setRefreshing(false)
//一旦网络请求成功完成。
Log.i(“刷新”、“刷新”);
新建下载JSON().execute();
}
});
ViewGroup vg=(ViewGroup)findViewById(R.id.mainlayoutarea);
视图组。充气(TimelineActivity.this,R.layout.city_list,vg);
setContentView(R.layout.city_列表);
ListView=(ListView)findViewById(R.id.cityList);
setOnScrollListener(新的OnScrollListener(){
@凌驾
公共无效onScrollStateChanged(AbsListView视图,int scrollState){
}
@凌驾
public void onScroll(AbsListView视图,int firstVisibleItem,
int visibleItemCount,int totalItemCount){
布尔启用=假;
if(theListView!=null&&theListView.getChildCount()>0){
//检查列表的第一项是否可见
布尔值firstItemVisible=ListView.getFirstVisiblePosition()=0;
//检查第一项的顶部是否可见
boolean-topOfFirstItemVisible=theListView.getChildAt(0.getTop()==0;
//启用或禁用刷新布局
enable=firstItemVisible&&topOfFirstItemVisible;
}
swipeContainer.setEnabled(启用);
}
});
swipeContainer.setColorSchemeResources(android.R.color.holo_蓝光,
android.R.color.holo_绿色_灯,
android.R.color.holo_橙色_灯,
android.R.color.holo_红灯);
新建下载JSON().execute();
}
如果我没有误解的话,您必须将SwipeRefreshLayout分卡并实现。对于ListView,应该足以返回
firstVisibileItem != 0
编辑:(检查打字错误)
你能提供一个片段吗?我不知道如何实现这个。我做到了。看一看
public class MySwipeRefreshLayout extends SwipeRefreshLayout {
private ListView mListView;
public boolean canChildScrollUp () {
if (mListView == null) {
mListView = (ListView) findViewById(R.id.idlistview);
}
return mListView.getFirstVisiblePosition() != 0;
}
}