How to use method of object in Android data binding?

Question

Suppose I have this object:

public class Field
{
   List<String> list;
   public Field()
   {
     list = new ArrayList();
   }
   public boolean isOnTheList(String someText)
   {
     return list.contains(someText);
   }
}

Now I want to use this function on a xml with binding like this.

<?xml version="1.0" encoding="utf-8"?>
<layout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">

<data>

    <import type="android.view.View"/>

    <variable
        name="field"
        type="com.greendao.db.Field"/>        

    <variable
        name="user"
        type="com.package.User"/>
</data>

<LinearLayout
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"    
    android:visibility="@{field.isOnTheList(user.name)?View.VISIBLE:View.GONE}"
    tools:context=".advisor.new_visit_report.activities.FieldsSelectionActivity"> ...

The problem is that is not working. Anyone has already tried this?

Are you really sure that public class Field is com.greendao.db.Field, instead of com.package.Field? Beyond that, please explain what "not working" means. Are you crashing? If so, what does LogCat show you? — CommonsWare
– CommonsWare, Commented Aug 23, 2016 at 18:02
Yes, that´s the correct Object. The app is not crashing, it's just that the visibility function is not working — Dan Ponce
– Dan Ponce, Commented Aug 23, 2016 at 18:10
You could try to set the return value of isOnTheList() to int and return View.VISIBLE or View.GONE directly. — yennsarah
– yennsarah, Commented Sep 1, 2016 at 12:26

yennsarah · Accepted Answer · 2016-09-02 05:17:32Z

3

If everything else is set correctly, I would suggest to edit your method to return View.VISIBLE or View.GONE directly:

public int isOnTheList(String someText) {
    return list.contains(someText) ? View.VISIBLE : View.GONE;
}

Used in xml:

android:visibility="@{field.isOnTheList(user.name)}

answered Sep 2, 2016 at 5:17

yennsarah

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2 Comments

Dan Ponce Over a year ago

I'll try now and let you know!

Dan Ponce Over a year ago

I tried with something similar and it works! Thanks!

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