Android - <Include/> 数据绑定

Question

I've reading some examples and Android documentation, but my implementation isn't working

I've my activity and my viewmodel.

<?xml version="1.0" encoding="utf-8"?>
<layout>

    <data>
        <variable
            name="viewmodel"
            type="package.to.viewmodel"/>
    </data>

    <android.support.v4.widget.DrawerLayout>

        <include
            app:viewmodel="@{viewmodel}"/>

        <!-- More Code -->

    </android.support.v4.widget.DrawerLayout>
</layout>

<?xml version="1.0" encoding="utf-8"?>
<layout>

    <data>

        <variable
            name="viewmodel"
            type="package.to.viewmodel"/>
    </data>

    <android.support.design.widget.CoordinatorLayout>

        <!-- More Code -->

        <android.support.design.widget.FloatingActionButton
            android:onClick="@{viewmodel.newButtonClickListener}"/>

    </android.support.design.widget.CoordinatorLayout>
</layout>

public class MainViewModelImpl implements MainViewModel {

    private View.OnClickListener newButtonClickListener;
    private View.OnClickListener newEventButtonClickListener;
    private View.OnClickListener newAssignmentButtonClickListener;
    private View.OnClickListener newContactButtonClickListener;
    private View.OnClickListener newChatButtonClickListener;

    //All the getters for the Listeners
}

So the code builds and runs without errors, but when I tap the button nothing happens, even though my listeners are correctly implemented.

Does anyone has an idea on why are the listeners not been triggered?

When I was debugging the application, I realize that the viewmodels in the include layout are null, even after the binding.

Answer 1

I figured it out, I was doing the binding before inflating the view. So now it works.

Thanks

Answer 2

When you set the viewModel variable in the include you should use bind:viewmodel instead of app:viewmodel .

An example is available in the official documentation or in the demo project of my data binding talk.