MainActivity.groovy

package com.mscharhag.groovytodo.activities

import android.app.Activity
import com.mscharhag.groovytodo.R
import com.mscharhag.groovytodo.ToDo

class MainActivity extends Activity {

    @Override
    protected void onStart() {
        super.onStart()
        setContentView(R.layout.create_todo)

        def button = findViewById(R.id.newTodoButton)

        // use groovy multiple assignment to map view ids to variables
        def (title, description) = [R.id.newTitle, R.id.newDescription].collect(this.&findViewById)

        button.onClickListener = {
            application.toDos << new ToDo(title.text.toString(), description.text.toString())
            finish()
        }
    }
}