메서드

견본

코드

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.AppCompatImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/bg_pattern2_aozora" />

    <android.support.v7.widget.AppCompatButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="中央"
        app:layout_constraintBottom_toBottomOf="@id/imageView"
        app:layout_constraintEnd_toEndOf="@id/imageView"
        app:layout_constraintStart_toStartOf="@id/imageView"
        app:layout_constraintTop_toTopOf="@id/imageView" />
</android.support.constraint.ConstraintLayout>

결실

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