Android Data Binding: missing DataBinderMapper class

Question

java.lang.NoClassDefFoundError: android.databinding.DataBinderMapper
        at android.databinding.DataBindingUtil.(DataBindingUtil.java:31)
        a         


        

Answer 1

You should include the android-apt plugin in your build.gradle in order to generate the android.databinding.DataBinderMapper class.

In your project build.gradle:

dependencies {
        classpath 'com.android.tools.build:gradle:1.3.1'
        classpath 'com.android.databinding:dataBinder:1.0-rc2'
        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
//.... more
}

In each module build.gradle:

apply plugin: 'com.android.application'
apply plugin: 'com.android.databinding'
apply plugin: 'com.neenbedankt.android-apt'

More information