How do I trigger a button click in my layout file?...

# android-databinding

[voben]

How do I trigger a button click in my layout file? I have this onClick on my Button xml. But I can’t create an instance on my person class because it keeps saying Cannot find Identifier Person . How do I resolve this?

android:onClick="@{() -> viewModel.doSomething(Person())}"

[Mark Murphy]

I don't think you can construct new objects in a data binding expression. Have doSomething() create the Person object. Or, create doSomethingWithANewPerson() that you call from the data binding expression, where it creates the Person object and calls doSomething().

[rattleshirt]

You are probably missing an import. However, normally you would bind a person instance as variable into the layout so you can call android:onClick="@{() -> viewModel.doSomething(person)}"

[Roman Donchenko]

Person()

You defenetly can’t construct new objects using new operator. Use @Mark Murphy suggestion. Or if you really need to create a new object instance using databinding - use static methods like Person.newInstance

[kagomez]

When you bind the data in your Activity, Fragment or ViewHolder class you should add a variable for that person; then you declare that object as an extra variable alongside your viewmodel in your xml.