My code shuffles colors and indexes for a list of ColorBox objects indefinitely.
This is my view:
<TextView
style="@style/App.WidgetStyle.ColorBox"
android:text="@{item.id}"
android:theme="@{item.theme}"
tools:text="A"
tools:theme="@style/App.ColorBox" />
My styles:
<style name="App.WidgetStyle.ColorBox" parent="App">
<item name="android:layout_width">@dimen/square_size</item>
<item name="android:layout_height">@dimen/square_size</item>
<item name="android:background">@drawable/shape_for_rounded_outlined_bg</item>
<item name="android:fontFamily">@font/open_sans_bold</item>
<item name="android:gravity">center</item>
</style>
My custom background shape:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners
android:radius="?attr/backgroundShapeCornerRadius" />
<solid android:color="?attr/colorPrimary"/>
<stroke android:width="1dp" android:color="?attr/colorSecondary"/>
</shape>
My themes:
<style name="App.ColorBox">
<item name="colorPrimary">@android:color/transparent</item>
<item name="colorSecondary">@color/black</item>
<item name="backgroundShapeCornerRadius">0dp</item>
</style>
<style name="App.ColorBox.Red">
<item name="colorPrimary">@color/color_1</item>
</style>
<style name="App.ColorBox.Green">
<item name="colorPrimary">@color/color_2</item>
</style>
<style name="App.ColorBox.White">
<item name="colorPrimary">@color/color_3</item>
</style>
<style name="App.ColorBox.Blue">
<item name="colorPrimary">@color/color_4</item>
</style>
My data class:
@Parcelize
data class ColorBox(var id: String, @StyleRes var theme: Int) : Parcelable
And if I try to compile, the compiler hates it:
Task :app:kaptDevDebugKotlin ANTLR Tool version 4.5.3 used for code generation does not match the current runtime version 4.7.1ANTLR Runtime version 4.5.3 used for parser compilation does not match the current runtime version 4.7.1ANTLR Tool version 4.5.3 used for code generation does not match the current runtime version 4.7.1ANTLR Runtime version 4.5.3 used for parser compilation does not match the current runtime version 4.7.1/Users/.../DataBinderMapperImpl.java:10: error: cannot find symbol import com....RowForItemBindingImpl; ^ symbol: class RowForItemBindingImpl
Task :app:kaptDevDebugKotlin FAILED location: package com....databinding FAILURE: Build failed with an exception.
- What went wrong: Execution failed for task ':app:kaptDevDebugKotlin'.
A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptExecution java.lang.reflect.InvocationTargetException (no error message)
But if I create a BindingAdapter (for instance this didn't work)
object AppBindingAdapters {
@JvmStatic
@BindingAdapter(value = ["colorBoxTheme"])
fun colorBoxTheme(view: View, @StyleRes themeResId: Int) {
view.background = ResourcesProvider(view.context).drawable(R.drawable.shape_for_rounded_outlined_bg, themeResId)
}
}
<TextView
style="@style/App.WidgetStyle.ColorBox"
android:text="@{item.id}"
app:colorBoxTheme="@{item.theme}"
tools:text="A"
tools:theme="@style/App.ColorBox.Green" />
It works :)
Is this a databinding bug or the desired behaviour? Why can't I apply a theme dynamically with databinding without the BindingAdapter "hack"?
Btw, ResourcesProvider it's a very handy helper class to provide resources.