我已经使用Chris Banes 的 pull 实现来刷新我的应用程序的列表视图。问题是如果我将列表视图的可见性设置为消失或不可见并使其在 java 代码中可见，则列表不会显示。另一方面，如果我将其可见性设置为可见或不设置其可见性，则一切正常。我的要求是我在同一个活动中有两个列表视图。我必须设置可见性，因为一旦它从服务器获取数据，它就会首先出现。另一个将出现在搜索功能上。我已将搜索结果的列表视图的可见性设置为在 xml 代码中消失，并使其仅在获得搜索结果后可见。尽管使用了setVisibility()对于此列表视图，它永远不会显示屏幕。我也检查了服务器响应。它在 logcat 上显示搜索结果。
我在下面发布我的代码：
活动中的代码片段
//The result from this async task will populate the first list view
if(NetworkConnection.isOnline(MainCategory.this))
{
new MainMenuAsyncTask(dataUrl, MainCategory.this, listMainMenu, false).execute();
}
else
{
Log.v(TAG, "no network available");
SeattleNightLifeUtility.OpenWiFiDialog(MainCategory.this, getResources().getString(R.string.no_internet_msg));
}
loadListView();
//This will populate the list view that I have created for search results
_txtAutoSearch.setOnEditorActionListener(new TextView.OnEditorActionListener()
{
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event)
{
String term = _txtAutoSearch.getText().toString().trim();
if(! term.equals(""))
{
SeattleNightLifeUtility.hideSoftKeyboard(MainCategory.this, _txtAutoSearch);
if(NetworkConnection.isOnline(MainCategory.this))
{
search(term, false);
}
else
{
SeattleNightLifeUtility.OpenWiFiDialog(MainCategory.this, getResources().getString(R.string.no_internet_msg));
}
}
return true;
}//onEditorAction
});
listMainMenu.setOnRefreshListener(new PullToRefreshListView.OnRefreshListener()
{
@Override
public void onRefresh()
{
if(NetworkConnection.isOnline(MainCategory.this))
{
new MainMenuAsyncTask(dataUrl, MainCategory.this, listMainMenu, true).execute();
}
else
{
SeattleNightLifeUtility.OpenWiFiDialog(MainCategory.this, getResources().getString(R.string.no_internet_msg));
}
}
});
listViewSearch.setOnRefreshListener(new PullToRefreshListView.OnRefreshListener()
{
public void onRefresh()
{
if(NetworkConnection.isOnline(MainCategory.this))
{
search(_txtAutoSearch.getText().toString().trim(), true);
}
else
{
SeattleNightLifeUtility.OpenWiFiDialog(MainCategory.this, getResources().getString(R.string.no_internet_msg));
}
}
});
搜索结果异步任务
public class GetSearchAsyncTask extends AsyncTask<Void, Void, String>
{
Context ctx;
ProgressDialog pd;
PullToRefreshListView listViewSearch;
public static final String TAG = "GetSearchAsyncTask";
public static ArrayList<SearchDAO> searchArrayList;
private String term, callingclass;
private TextView txtNoData;
boolean flag;
public GetSearchAsyncTask(String term, Context ctx,
PullToRefreshListView listViewSearch, TextView txtNoData,
String callingclass, boolean flag)
{
this.term = term;
this.ctx = ctx;
this.listViewSearch = listViewSearch;
this.txtNoData = txtNoData;
this.callingclass = callingclass;
this.flag = flag;
}//Constructor
@Override
protected void onPreExecute()
{
if(flag == false)
{
pd = new ProgressDialog(ctx);
pd.setMessage(ctx.getResources().getString(R.string.please_wait));
pd.show();
}
}//onPreExecute
protected String doInBackground(Void... params)
{
String parsed = ServerConnection.getSearchedData(term);
try
{
if(flag == true)
{
Log.v(TAG, "doInBackground isListRefreshed is true");
Thread.sleep(2000);
}
}
catch(Exception e){}
return parsed;
}//doInBackground
@Override
protected void onPostExecute(String result)
{
searchArrayList = ParsedSearchData.getSearchedData(result);
listViewSearch.setVisibility(View.VISIBLE);
if(searchArrayList != null && searchArrayList.size() > 0)
{
Log.v(TAG, "searcharraylist not null");
for(int i = 0; i < searchArrayList.size(); i++)
{
Log.v(TAG, "Name: "+searchArrayList.get(i).getMerchant());
}
SearchAdapter mSearchAdapter = new SearchAdapter(ctx, searchArrayList);
mSearchAdapter.notifyDataSetChanged();
listViewSearch.setAdapter(mSearchAdapter);
if(callingclass.equals("EventActivity"))
{
Log.v(TAG, "callingclass EventActivity");
if(txtNoData.getVisibility() == View.VISIBLE)
{
Log.v(TAG, "txtNoData VISIBLE");
txtNoData.setVisibility(View.GONE);
}
if(((EventsActivity)ctx).txtNoEvent.getVisibility() == View.VISIBLE)
{
Log.v(TAG, "txtNoEvent VISIBLE");
((EventsActivity)ctx).txtNoEvent.setVisibility(View.GONE);
}
}
else
{
Log.v(TAG, "callingclass not EventActivity");
if(txtNoData.getVisibility() == View.VISIBLE)
{
Log.v(TAG, "else loop txtNoData VISIBLE");
txtNoData.setVisibility(View.GONE);
}
if(listViewSearch.getVisibility() == View.VISIBLE)
{
Log.v(TAG, "listViewSearch VISIBLE");
}
else
{
Log.v(TAG, "listViewSearch INVISIBLE");
}
}
}
else
{
Log.v(TAG, "searcharraylist null");
if(callingclass.equals("EventActivity"))
{
Log.v(TAG, "callingclass EventActivity");
txtNoData.setVisibility(View.VISIBLE);
listViewSearch.setVisibility(View.GONE);
if(((EventsActivity)ctx).txtNoEvent.getVisibility() == View.VISIBLE)
{
Log.v(TAG, "searcharraylist null else txtNoEvent VISIBLE");
((EventsActivity)ctx).txtNoEvent.setVisibility(View.GONE);
}
}
else
{
Log.v(TAG, "callingclass not EventActivitysearcharraylist null else txtNoEvent VISIBLE");
txtNoData.setVisibility(View.VISIBLE);
listViewSearch.setVisibility(View.GONE);
}
}
if(flag == false)
{
if(pd != null)
{
Log.v(TAG, "onPostExecute pd not null");
if(pd.isShowing())
{
Log.v(TAG, "onPostExecute pd is showing");
pd.dismiss();
}
}
}
else
{
listViewSearch.onRefreshComplete();
}
}//onPostExecute
}
搜索方法
protected void search(String term, boolean result)
{
listMainMenu.setVisibility(View.GONE);
//listViewSearch.setVisibility(View.VISIBLE);
new GetSearchAsyncTask(term, MainCategory.this, listViewSearch , txtNoData, "MainCategory", result).execute();
}//search