[JAVA] [Android] Variable of Data Binding is written in camelCase

<variable name="hoge_text" type="String">

Than,

<variable name="hogeText" type="String">

The story that I don't think I'm in trouble. Because I was addicted to it.

Concrete example

"When I tried to use the variable of snake_case in the<include>file, I couldn't access it."

Try to write xml

child.xml

<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="value_text"
            type="String" />
    </data>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@{value_text}"/>
</layout>

parent.xml

<Parent element omitted>
    <include
        layout="@layout/child"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:value_text="@{someVariable}"/>
</Parent element omitted>

Generated code

ChildBindingImpl.java

    public void setValueText(@Nullable java.lang.String ValueText) {
        this.mValueText = ValueText;
        synchronized(this) {
            mDirtyFlags |= 0x2L;
        }
        notifyPropertyChanged(BR.value_text);
        super.requestRebind();
    }

ParentBindingImpl.java

    @Nullable
    private final app.package.name.databinding.ChildBinding mboundView;
// ~~~Abbreviation~~~
            this.mboundView.setValue_text(someVariableGetValue); // <-You! !!

error contents

error:Can't find symbol
            this.mboundView3.setValue_text(someVariableGetValue);
                            ^
symbol:Method setValue_text(String)

So, the function name generated by the ʻapp: snake_caseattribute is Build fails because it is different from the function name generated by`.

I feel like "Then ʻapp: camelCase & `," In that case, ** the name cannot be resolved on the xml file side, and an error occurs before the BindingImpl is generated **. Even on the writing side, switching between them is difficult in xml. (In my case)

Coping

As I wrote at the beginning.

child.xml

<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="valueText"
            type="String" />
    </data>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@{valueText}"/>
</layout>

parent.xml

<Parent element omitted>
    <include
        layout="@layout/child"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:valueText="@{someVariable}"/>
</Parent element omitted>

Let's change the definition to camelCase.

bonus

I don't think it's been stated so much, I also searched for a two-word variable name in the Official sample. It was camelCase. (ʻUserList`)

    <data>
        <import type="com.example.User"/>
        <import type="java.util.List"/>
        <variable name="user" type="User"/>
        <variable name="userList" type="List&lt;User>"/>
    </data>

There is a feeling that this area (then the id of resource is also camelCase?) Is not consistent even in the code provided by Google, so it seems that it will be a small topic from old times.