动作条，PullToRefresh与ListView和片段 [英] ActionBar-PullToRefresh with ListView and Fragment
问题描述
我想实现的ActionBar，PullToRefresh在我的应用程序。活动中有一个片段和片段中有一个列表视图。列表视图的实现与自定义适配器。
I am trying to implement ActionBar-PullToRefresh in my application. The activity has a fragment in it and the fragment has a listview in it. The implementation of listview is with custom adapter.
我试着在GitHub上的快速入门-ABS引导来实现它，但是拉不工作。我有我没有正确初始化的PullToRefresh的感觉。请看看我的code低于...
I tried to implement it with the QuickStart-ABS guide on github, but the pull doesn't work. I have a feeling that I am not initialising the PullToRefresh correctly. Please have a look at my code below...
fragment_news_list.xml
fragment_news_list.xml
<?xml version="1.0" encoding="utf-8"?>
<uk.co.senab.actionbarpulltorefresh.extras.actionbarsherlock.PullToRefreshLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ptr_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="@+id/listview_news_list"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</uk.co.senab.actionbarpulltorefresh.extras.actionbarsherlock.PullToRefreshLayout>
NewsListFragment.java
NewsListFragment.java
import java.util.ArrayList;
import java.util.List;
import uk.co.senab.actionbarpulltorefresh.extras.actionbarsherlock.PullToRefreshLayout;
import uk.co.senab.actionbarpulltorefresh.library.ActionBarPullToRefresh;
import uk.co.senab.actionbarpulltorefresh.library.listeners.OnRefreshListener;
import android.app.ProgressDialog;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.util.LruCache;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import com.actionbarsherlock.app.SherlockFragment;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.NetworkImageView;
import com.android.volley.toolbox.Volley;
public class NewsListFragment extends SherlockFragment implements
OnRefreshListener {
ProgressDialog pd;
ImageLoader imageLoader;
JsonArrayRequest jsArrayRequest;
Database db;
ListView listview;
List<NewsItem> newsItems = new ArrayList<NewsItem>();
NewsAdapter adapter;
NewsDbAdapter mNewsDbAdapter;
private PullToRefreshLayout mPullToRefreshLayout;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mNewsDbAdapter = DatabaseHelper.get(
getActivity().getApplicationContext()).getNewsDbAdapter();
// unrelated code removed
View view = inflater.inflate(R.layout.fragment_news_list, container,
false);
pd = new ProgressDialog(getActivity());
pd.setMessage("Loading...");
pd.show();
pd.setCancelable(true);
newsItems = mNewsDbAdapter.getNewsTitles();
adapter = new NewsAdapter(getActivity(), newsItems);
listview = (ListView) view.findViewById(R.id.listview_news_list);
listview.setAdapter(adapter);
pd.dismiss();
return view;
}
public class NewsAdapter extends ArrayAdapter<NewsItem> {
// Adapter code goes in here... removed as not necessary
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
ViewGroup viewGroup = (ViewGroup) view;
// As we're using a ListFragment we create a PullToRefreshLayout manually
mPullToRefreshLayout = new PullToRefreshLayout(viewGroup.getContext());
// We can now setup the PullToRefreshLayout
ActionBarPullToRefresh.from(getActivity())
// We need to insert the PullToRefreshLayout into the Fragment's ViewGroup
.insertLayoutInto(viewGroup)
// Here we mark just the ListView and it's Empty View as pullable
.theseChildrenArePullable(android.R.id.list, android.R.id.empty)
.listener(this)
.setup(mPullToRefreshLayout);
}
@Override
public void onRefreshStarted(View view) {
// Hide the list
// setListShown(false);
listview.setVisibility(View.INVISIBLE);
/**
* Simulate Refresh with 4 seconds sleep
*/
new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... params) {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Notify PullToRefreshLayout that the refresh has finished
mPullToRefreshLayout.setRefreshComplete();
if (getView() != null) {
// Show the list again
//setListShown(true);
listview.setVisibility(View.VISIBLE);
}
}
}.execute();
}
}
我在哪里去了？如果某些人有与一个ListView片段为例，请在这里分享链接。
Where am I going wrong? If some one has an example with fragment with a listview, please share the link here..
谢谢！
改变了这种
theseChildrenArePullable(android.R.id.list, android.R.id.empty)
到
theseChildrenArePullable(R.id.listview_news_list, android.R.id.empty)
和它的工作...
推荐答案
我认为问题是，你不使用你的片段布局的ListView，但是默认的从框架，试试这个：
I believe the problem is that you are not using the ListView in your Fragment layout, but a default one from the framework, try this :
// setup the PullToRefreshLayout
ActionBarPullToRefresh.from(getActivity())
// We need to insert the PullToRefreshLayout into the Fragment's ViewGroup
.insertLayoutInto(viewGroup)
// Here we mark just the ListView and it's Empty View as pullable
.theseChildrenArePullable(R.id. listview_news_list, android.R.id.empty)
.listener(this)
.setup(mPullToRefreshLayout);
如果它不工作，你也可以做尝试在onCreateView方法如下：
If it's not working, you could also try by doing the following in your onCreateView method :
mPullToRefreshLayout = ((PullToRefreshLayout) view.findViewById(R.id.ptr_layout));
，然后设置它像这样在onActivityCreated或onViewCreated：
and then setup it like this in onActivityCreated or onViewCreated :
ActionBarPullToRefresh
.from(getActivity())
.allChildrenArePullable()
.listener(this)
.setup(this.mPullToRefreshLayout);
有关记录，我使用 PullToRefreshLayout 我的应用程序一个片段里面，它的工作就好了。让我知道，如果它的工作原理。
For the record, I am using PullToRefreshLayout inside a Fragment in my app and it's working just fine. Let me know if it works.
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