I'm trying to implement an EmptyView on my RecyclerView Adapter but I'm not getting any result.
I've followed this tutorial and this tip, but noone worked for me.
I've implemented:
if (viewType == EMPTY_VIEW) {
v = LayoutInflater.from(parent.getContext()).inflate(R.layout.empty_view, parent, false);
EmptyViewHolder evh = new EmptyViewHolder(v);
return evh;
}
v = LayoutInflater.from(parent.getContext()).inflate(R.layout.data_row, parent, false);
ViewHolder vh = new ViewHolder(v);
return vh;
But it doesn't let me compile because they are differents ViewHolder, because I've created two ViewHolder classes but they extends Recycler.ViewHolder so I don't get it...
I'm trying to do this because I've got a SearchView and I want when the list is empty it shows an EmptyView, I've got it doing it programmatically but I prefer to add like a layout because I don't know that much how to put TextViews and Buttons programmatically.
Also if I put
return dataList.size() > 0 ? dataList.size() : 1;
It gives to me error because index is 0.
I've debugged the viewType and always is 1, then it won't join the if condition...
Deep on Android I found this :
/**
* Return the view type of the item at <code>position</code> for the purposes
* of view recycling.
*
* <p>The default implementation of this method returns 0, making the assumption of
* a single view type for the adapter. Unlike ListView adapters, types need not
* be contiguous. Consider using id resources to uniquely identify item view types.
*
* @param position position to query
* @return integer value identifying the type of the view needed to represent the item at
* <code>position</code>. Type codes need not be contiguous.
*/
public int getItemViewType(int position) {
return 0;
}
But the thing is that no changes the value.
EDIT
I almost done it, I did this :
@Override
public int getItemViewType(int position) {
return list.size() > 0 ? list.size() : 1;
}
But sometimes it returns 0 when the size() is 0... I don't get it, I'm using this SearchView, and sometimes when I type a letter that doesn't matches with any item of the list it doesn't show and sometimes it does...
Also other thing that happens is that when the layout popups it shows on the left of the screen when I put that is on center, but I think it's problem with RecyclerView because the layout puts inside of it.
RecyclerView layout :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:id="@+id/rtpew"
android:layout_centerInParent="true"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
>
<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/linearpew">
<android.support.v7.widget.RecyclerView
android:id="@+id/rv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
</RelativeLayout>
And this is my emptylayout :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/ImageViewSearchFail"
android:src="@drawable/sadface"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:layout_gravity="center"
android:textSize="@dimen/15dp"
android:layout_marginTop="4dp"
android:text="foo"
android:layout_below="@+id/ImageViewSearchFail"
android:layout_centerHorizontal="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/ButtonAddEntity"
android:text="foo"
android:background="?android:selectableItemBackground"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
The other way that I thought is to implement it programmatically as follow :
@Override
public boolean onQueryTextChange(String query) {
final ArrayList<List> filteredModelList = filter(mModel, query);
mAdapter.animateTo(filteredModelList);
rv.scrollToPosition(0);
if(query.isEmpty()){
//Here
}
return true;
}
And :
private ArrayList<List> filter(ArrayList<List> models, String query) {
query = query.toLowerCase();
final ArrayList<List> filteredModelList = new ArrayList<List>();
for (List model : models) {
final String text = model.getRedName().toLowerCase();
if (text.contains(query)) {
filteredModelList.add(model);
}
}
if (filteredModelList.size()<0) {
//HERE
}
else{
//Delete the views added
}
return filteredModelList;
}
PROBLEMS
-I only add the view using the @Jimeux answer but I'd like to do this on the Adapter, I got it, but not always shows the view even if the list is empty.
-At the time to put the emptyview.xml it puts inside of the RecyclerView then since I've put all of this xml at the center it shows on the right. I've tried to add the xml programmatically but it's like a chaos....
