How to bind custom object to spinner layout using databinding library?

Question

I wish to bind my object to spinner row layout by android databinding library. Post 1 and Post 2 not explained how I can use databinding and how to bind multiple fields (not only one string) of data object.

My data object looks like:

class Data{
    public final String imageUri;
    public final String title;
    public final int totalCount;
}

Layout I wish looks as:

<!-- horisontal orientation -->
<LinearLayout>
    <!-- Icon -->
    <ImageView/>

    <!-- Title -->
    <TextView/>

    <!-- TotalCount -->
    <TextView/>
</LinearLayout>

and how it bind I don't know...

If android databinding library not support this functionality, interesting look at another ways of binding custom data object and layout — Sergei Bubenshchikov, Dec 28 '16 at 09:29

Sasank Sunkavalli · Accepted Answer · 2016-12-28T10:51:33.233

2

You have to wrap your entire layout in layout tag to use Data Binding.This way you can assign the Model to your View So this should be your layout.

<layout>
   <data>
     <variable name="data" type="your.packagename.Data">
     </variable> 
   </data>
   <!-- horisontal orientation -->
   <LinearLayout>
     <!-- Icon -->
     <ImageView
       android:src="@{data.imageUri}"/>

     <!-- Title -->
     <TextView
       android:text="@{data.title}"/>

     <!-- TotalCount -->
     <TextView
       android:text="@{data.totalCount}"/>

  </LinearLayout>
</layout>

Lets assume your are using Activity to show the Spinner & your layout name is custom_spinner.xml . Then here is how you set the data to layout. After setting the Spinner Adapter, here is what you need to do

Data data; // Data object
CustomSpinnerBinding binding = DataBindingUtil.inflate(R.layout.custom_spinner);
binding.setData(data);

This should be your custom Adapter

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    CustomSpinnerBinding binding = DataBindingUtil.inflate(R.layout.custom_spinner);
    binding.setData(dataList.get(position)); // you should pass dataList as an argument in Custom Adapter constructor
}

edited Dec 28 '16 at 10:51

answered Dec 28 '16 at 09:48

Sasank Sunkavalli

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can you explain: who set _data variable_ of layout? I want to understand this mechanism – Sergei Bubenshchikov Dec 28 '16 at 09:53
I understand how to bind data to layout, but question is: how to use binding mechanism with spinner adapter and set of data objects? – Sergei Bubenshchikov Dec 28 '16 at 10:08
You share your SpinnerAdapter – Sasank Sunkavalli Dec 28 '16 at 10:19
For strings I use _ArrayAdapter_. Which adapter used for databindings I don't understand – Sergei Bubenshchikov Dec 28 '16 at 10:34
Then how will you inflate your custom spinner layout for each spinner item without using your custom adapter. Something like this http://stackoverflow.com/a/8116756/5173119 – Sasank Sunkavalli Dec 28 '16 at 10:37
You suggest just override _getView_ and _getDropDownView_ methods of adapter to inflate databinding layout? – Sergei Bubenshchikov Dec 28 '16 at 10:45
You might also need some custom binding adapters or better attributes for setting the image url or the count text. – tynn Dec 28 '16 at 15:52
@tynn Yeah exactly , http://stackoverflow.com/a/41214783/5173119 similar to this , where we can load the image. – Sasank Sunkavalli Dec 28 '16 at 17:20

How to bind custom object to spinner layout using databinding library?

1 Answers1