I want to use data binding in a fragment to trigger all my button clicks in handler class. When I run the code below I get the following error. I'm not sure if the problem is with how I'm passing the context to the Handler class or if I've done some wrong the Data binding. UserFragment MyClickHandlers fragment_user Answer Your

How to link a click handler to a fragment for data binding?

I want to use data binding in a fragment to trigger all my button clicks in handler class. When I run the code below I get the following error.

D:CodingupdatedGithubAndroidHiveDataBindingFragmentsappbuildgeneratedap_generated_sourcesdebugoutcomexampleandroidhivedatabindingfragmentsDataBinderMapperImpl.java:10: error: cannot find symbol
import com.example.androidhivedatabindingfragments.databinding.FragmentUserBindingImpl;
                                                              ^
  symbol:   class FragmentUserBindingImpl
  location: package com.example.androidhivedatabindingfragments.databinding

I’m not sure if the problem is with how I’m passing the context to the Handler class or if I’ve done some wrong the Data binding.

UserFragment

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        FragmentUserBinding binding = DataBindingUtil.inflate(inflater, R.layout.fragment_user, container, false);
        View view = binding.getRoot();

        User user = new User();
        user.setName("First Last");
        user.setEmail("email@email.com");

        binding.setUser(user);

        MyClickHandlers handlers = new MyClickHandlers(getActivity());
        binding.setHandlers(handlers);


        return view;
    }

MyClickHandlers

public class MyClickHandlers {
    private static final String TAG = "MyClickHandlers";

    Context context;

    public MyClickHandlers(Context context) {
        this.context = context;
    }

    public void myClick() {
        Log.d(TAG, "myClick: ");
    }
}

fragment_user

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

    <data>
        <variable
            name="user"
            type="com.example.androidhivedatabindingfragments.User" />
        <variable
            name="handlers"
            type="com.example.androidhivedatabindingfragments.MyClickHandlers" />
    </data>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".UserFragment"
        android:orientation="vertical">

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Click ME"
            android:id="@+id/btn_Click"
            android:onClick="@{handlers::myClick}"/>

        <include android:id="@+id/content"
        layout="@layout/content_main"
        bind:user="@{user}" />

    </LinearLayout>
</layout>

Answer

Your onClick() of MyHandlers has to have the view you click as a parameter, so change it to be:

public void myClick(View view) {
    Log.d(TAG, "myClick: ");
}

I guess that will solve the problem, also please instantiate the MyClickHandlers with the context instead of activity, as both are different things.

so in onCreateView(), add requireContext() instead of getActivity()

MyClickHandlers handlers = new MyClickHandlers(requireContext());

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Answer