使用PullToRefreshLayout时显示列表视图标题

Question

我指的是this教程刷新ListView ，它的工作很好。但问题是我有一个Layout以上ListView因此，当我运行我的应用程序Listview获得覆盖Layout。为了避免这种情况，我将这个布局作为标题ListView，但随后出现了一个新问题。当列表为空时ListViewHeader也未显示。我也在Adapter中使用isEmpty（），它仍然没有显示Header。

类：

 @Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    activityView = layoutInflater.inflate(R.layout.groups_activity_layout, null, false); 

    setContentView(activityView); 



    /******************************************************************************/ 
    ViewGroup viewGroup = (ViewGroup) activityView; 
    // As we're using a ListFragment we create a PullToRefreshLayout manually 
    mPullToRefreshLayout = new PullToRefreshLayout(ItemscreenActivity.this); 

    // We can now setup the PullToRefreshLayout 
    ActionBarPullToRefresh.from(this) 
    // 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_demo_Items_gsal, android.R.id.empty).listener(this).setup(mPullToRefreshLayout); 

    /******************************************************************************/ 

    arrayListOfAItems.clear(); 
    populateItemsArrayList(ItemscreenActivity.this); 

    ItemsListWrtCnt++; 
    // Getting the reference of Button and ListView 
    listViewOfItems = (ListView) findViewById(R.id.listView_demo_Items_gsal); 

    // Get Data in Adapter to set on ListView 
    ItemscreenActivityAdapter = new ItemscreenAdapter(ItemscreenActivity.this, R.layout.group_screen_adapter_layout, arrayListOfAItems); 
    listViewOfItems.setTextFilterEnabled(false); 
    listViewOfItems.setScrollingCacheEnabled(false); 
    listViewOfItems.setCacheColorHint(Color.TRANSPARENT); 

    LayoutInflater inflater = getLayoutInflater(); 
    ViewGroup header = (ViewGroup) inflater.inflate(R.layout.group_activity_listview_header, listViewOfItems, false); 
    listViewOfItems.addHeaderView(header, null, false); 
    listViewOfItems.setEmptyView(header); 
    listViewOfItems.setVisibility(View.VISIBLE); 

    if (arrayListOfAItems.size() > 0) { 
     // Set Adapter to ListView of group if there are Items 
     ItemscreenActivityAdapter.notifyDataSetChanged(); 
     listViewOfItems.setAdapter(ItemscreenActivityAdapter); 
     ItemsListWrtCnt--; 
    } else { 
     // Show Toast if no group to display 
     Toast.makeText(ItemscreenActivity.this, "No Items", Toast.LENGTH_SHORT).show(); 
    } 


} 

XML：

<?xml version="1.0" encoding="utf-8"?> 
<com.oi.demo.actionbarpulltorefresh.library.PullToRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/layout_Items" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:background="@android:color/white" 
    android:orientation="vertical" 
    tools:ignore="UselessParent" > 

    <ListView 
     android:id="@+id/listView_demo_Items_gsal" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_above="@+id/view_layout_footer_gsal" 
     android:animationCache="false" 
     android:background="@android:color/transparent" 
     android:cacheColorHint="@android:color/transparent" 
     android:divider="@null" 
     android:persistentDrawingCache="scrolling" 
     android:scrollbarStyle="outsideOverlay" 
     android:scrollbars="vertical" 
     android:scrollingCache="false" 
     android:smoothScrollbar="true" /> 

    <View 
     android:id="@+id/view_layout_footer_gsal" 
     android:layout_width="fill_parent" 
     android:layout_height="5dp" 
     android:layout_gravity="bottom" 
     android:background="#952d4a" /> 

</com.oi.demo.actionbarpulltorefresh.library.PullToRefreshLayout> 

Answer 1

您需要做的仅仅是设置适配器出方的，如果条件。如：

if (arrayListOfAItems.size() > 0) { 
    // Set Adapter to ListView of group if there are Items 
    ItemscreenActivityAdapter.notifyDataSetChanged(); 

    ItemsListWrtCnt--; 
} else { 
    // Show Toast if no group to display 
    Toast.makeText(ItemscreenActivity.this, "No Items", Toast.LENGTH_SHORT).show(); 
} 

listViewOfItems.setAdapter(ItemscreenActivityAdapter); 

至于显示标题，你需要设置适配器的任何方式。 虽然列表为空，但未设置适配器，因此您无法看到标题。

试试吧。它会工作肯定。