How to call static method with data binding?

Question

I want to call my Util class method in layout.xml file like

<TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@{PreferenceUtil.getSavedUser().fullName}"/>

I have imported PreferenceUtil

<import type="com.amelio.utils.PreferenceUtil"/>

And PreferenceUtil.class has some methods.

public class PreferenceUtil {

    public static LoginResponse getSavedUser() {
        SharedPreferences sf = Amelio.getInstance().getSharedPreferences(PREF, Context.MODE_PRIVATE);
        String userJson = sf.getString(PREF_USER_DATA, null);
        if (userJson == null || userJson.equals("")) {
            return null;
        }
        return new Gson().fromJson(userJson, LoginResponse.class);
    }
}

Issue

    Found data binding errors.
****/ data binding error ****msg:cannot find method getSavedUser() in class com.amelio.utils.PreferenceUtil
file:D:\Khemraj\_AndroidStudioWorkspace_\amelioFinal\app\src\main\res\layout\activity_cart.xml
loc:94:40 - 94:68
****\ data binding error ****

Is this even possible, also suggest if this is recommended or not.

Calling static methods from data binding expressions definitely works -- I use Html.fromHtml() in various book examples. Is LoginResponse marked as public? Also, please do not do I/O (getSharedPreferences()) and data parsing (new Gson().fromJson()) on the main application thread, as you are here. — CommonsWare
– CommonsWare, Commented May 11, 2018 at 13:48
For example, if LoginResponse is not public, it is possible that the data binding framework cannot really resolve that method reference. — CommonsWare
– CommonsWare, Commented May 11, 2018 at 14:08
@CommonsWare Am I able to access getSavedUser() from layout file if PreferenceUtil is a final class and not publicly instantiable. I mean the class is public and getSavedUser() method is public and static — user3135923
– user3135923, Commented Jul 3, 2019 at 7:19
@user3135923: Use an <import> element in the <data> to declare the PreferenceUtil type, using the fully-qualified class name. Then, your binding expressions can refer to the static methods on that class. — CommonsWare
– CommonsWare, Commented Jul 3, 2019 at 10:48

DHRUV SINGH · Accepted Answer · 2018-08-13 13:47:58Z

8

I hope you must have found the answer in case if you are still struggling then find the answer below.

    <data>
      <import type="com.amelio.utils.PreferenceUtil"/>
 </data>


<TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text='@{PreferenceUtil.getSavedUser()}' />

Please make sure your LoginResponse is marked public to access the values.

answered Aug 13, 2018 at 13:47

DHRUV SINGH

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Comments

Zahra Sdg · Accepted Answer · 2020-05-22 18:31:17Z

1

in case you haven't found the answer yet:
you need to import the object type and cast it to that type like this:

<data>
  <import type="com.amelio.utils.PreferenceUtil"/>
  <import type="yourdirectory.LoginResponse"/>

</data>


<TextView
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text='@{((LoginResponse)(PreferenceUtil.getSavedUser()).fullName}' />

edited May 22, 2020 at 18:31

answered Jan 9, 2019 at 18:22

Zahra Sdg

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