Android - DataBinding - How and when the Binding classes will be generated?

Question

DataBinding Guide States

  By default, a Binding class will be generated based on the name of the layout  file, converting it to Pascal case and suffixing “Binding” to it.  The above layout file was activity_main.xml so the generate class was ActivityMainBinding. 

When will the Binding class , here say ActivityMainBinding, will be generated. I have compile time error. "cannot resolve ActivityMainBinding".

ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.main_activity); 

Any help is appreciated. Thanks

Answer 1

What is your layout name?

The above layout file was activity_main.xml so the generate class was ActivityMainBinding.

What this means is that the generated class name will depend on your layout's name

activity_main.xml -> ActivityMainBinding.java

I think your activity name is "main_activity", so the generated binding class name should be MainActivityBinding not ActivityMainBinding

Answer 2

When it's not generating the binding class, I restart Android studio. Then the binding class will be generated. Isn't it caused by cache of android studio?

BTW, if you are using android-apt, please check it. Because it will cause binding class not to be generate.