setEmptyView() doesn't seem to work for (Sherlock)ListFragment

问题

I have a ListFragment and I want to set its empty view, so I use the following code:

View emptyView = getLayoutInflater().inflate(R.layout.collection_empty_view, null);
detailFragment.getListView().setEmptyView(emptyView);

for the following xml layout:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/empty"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/tv_empty"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:gravity="center"
        android:text="@string/empty_collection" />

    <Button
        android:id="@+id/btn_add_legislation"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="addText"
        android:text="@string/action_add_text" />

</LinearLayout>

But nothing shows up!

I tried detailFragment.getListView().setEmptyText(), and that did work! Am I doing domething wrong?

回答1:

The empty view has to be in the same view hierarchy as the list view. Inflating it that way won't work.

Generally I create a layout in the format below:

<Layout>
    <ListView/>
    <View android:id="@+id/empty"/>
</Layout>

Where empty view is the View I want to use as my "empty view". Then in on create I get a reference to the empty view and call setEmptyView() with that reference.

Here's an example from the Android documentation (check out the documentation, it should be applicable to SherlockListFragment):

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
         android:orientation="vertical"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:paddingLeft="8dp"
         android:paddingRight="8dp">

     <ListView android:id="@id/android:list"
               android:layout_width="match_parent"
               android:layout_height="match_parent"
               android:background="#00FF00"
               android:layout_weight="1"
               android:drawSelectorOnTop="false"/>

     <TextView android:id="@id/android:empty"
               android:layout_width="match_parent"
               android:layout_height="match_parent"
               android:background="#FF0000"
               android:text="No data"/>
 </LinearLayout>

回答2:

You can try something which I'm doing in a fragment of my application. I don't know if it's a good practice but it works!

View emptyView = getActivity().getLayoutInflater().inflate(R.layout.empty, null);
getActivity().setContentView(emptyView);

来源：https://stackoverflow.com/questions/17472137/setemptyview-doesnt-seem-to-work-for-sherlocklistfragment