Deprecated
VectorDrawables are supported in DataBinding natively since AGP 4.0.0.
DataBindingCompat
A Gradle plugin that adds support for
VectorDrawableCompat
to the Data Binding Library.
Why?
The Data Binding Library supports resources in binding expressions, and drawable resources in particular.
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@{condition ? @drawable/image1 : @drawable/image2}" />But if your project uses support vector drawables you're in a big trouble.
android {
defaultConfig {
vectorDrawables.useSupportLibrary = true
}
} Unfortunately, the Data Binding Library doesn't call AppCompatResources.getDrawable() when loading drawables, so the
binding above will throw an exception at runtime on pre-Lollipop devices. DataBindingCompat solves this issue and all
you need to do is just to apply the Gradle plugin.
Usage
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'io.michaelrocks:databindingcompat:1.1.7'
}
}
apply plugin: 'com.android.application'
apply plugin: 'io.michaelrocks.databindingcompat'How it works
When you use a drawable resource in a binding expression the Data Binding Library inflates this drawable by calling
the ViewDataBinding.getDrawableFromResource() method. The DataBindingCompat plugin patches ViewDataBinding class at
compile time and replaces the implementation of getDrawableFromResource() with an invocation of
AppCompatResources.getDrawable(). The same transformation the plugin does with the
ViewDataBinding.getColorStateListFromResource() method. And that's it.
ViewDataBinding before patching:
protected static Drawable getDrawableFromResource(View view, int resourceId) {
if (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
return view.getContext().getDrawable(resourceId);
} else {
return view.getResources().getDrawable(resourceId);
}
}
protected static ColorStateList getColorStateListFromResource(View view, int resourceId) {
if (VERSION.SDK_INT >= VERSION_CODES.M) {
return view.getContext().getColorStateList(resourceId);
} else {
return view.getResources().getColorStateList(resourceId);
}
}ViewDataBinding after patching:
protected static Drawable getDrawableFromResource(View view, int resourceId) {
return AppCompatResources.getDrawable(view.getContext(), resourceId));
}
protected static ColorStateList getColorStateListFromResource(View view, int resourceId) {
return AppCompatResources.getColorStateList(view.getContext(), resourceId));
}License
Copyright 2017 Michael Rozumyanskiy
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.