Databinding variable inheritance with included layout

Question

I am learning data binding and mvvm. I have an issue where I would like a BaseViewModel.kt to include some UI related variables such as an isLoading fl

Answer 1

You can use binding with include like

loading_view.xml

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

    <data>

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

        <variable
            name="visibility"
            type="boolean"
            />

        <variable
            name="text"
            type="String"
            />
    </data>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#ff0"
        android:gravity="center_horizontal"
        android:orientation="vertical"
        android:visibility="@{visibility?View.VISIBLE:View.GONE}"
        >
        <ProgressBar
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:text="@{text}"
            tools:text="AA"
            />
    </LinearLayout>
</layout>

Using

<include
        layout="@layout/loading_view"
        app:visibility="@{viewModel.loadingCondition}"
        app:text='@{"AA"}'
        />

you can also pass the hard value like

app:visibility="@{false}"
app:text="@{@string/loading_text}"

Answer 2

for those who still don't have solution, just check your code and check whether the name of "bind" attribute is same as the one used in the included layout

<include
       ...
        bind:viewModel="@{viewModel}"/>

and

<data>
    ...
    <variable
        name="viewModel"
        type="core.sdk.ui.base.BaseViewModel" />

</data>

Answer 3

I think you should cast it in the binding:

<include
    android:id="@+id/progress_include"
    layout="@layout/progress_bar"
    android:visibility="@{viewModel.isLoading ? View.VISIBLE : View.GONE}"
    bind:viewModel="@{(core.sdk.ui.base.BaseViewModel)viewModel}"/>