<?xml version="1.0" encoding="utf-8"?> <layout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto"> <data> <variable name="mainViewModel" type="keijumt.devandroid.viewmodel.MainViewModel" /> </data> <android.support.constraint.ConstraintLayout android:layout_width="match_parent" android:layout_height="match_parent"> <EditText android:id="@+id/edit_postal_code" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="@string/input_postal_code" android:inputType="number" android:text="@={mainViewModel.postalCode}" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> <Button android:id="@+id/btn_search_postalcode" android:layout_width="wrap_content" android:layout_height="wrap_content" android:enabled="@{mainViewModel.postalCode.length == 7 ? true : false}" android:onClick="@{() -> mainViewModel.search()}" android:text="@string/search" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@id/edit_postal_code" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@{mainViewModel.address}" app:layout_constraintTop_toBottomOf="@id/btn_search_postalcode" /> </android.support.constraint.ConstraintLayout> </layout>