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Align one view's edge to another view's center in Android's ConstraintLayout
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/target"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:text="TargetView"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="HardcodedText" />
<Button
android:id="@+id/view_to_align"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="64dp"
android:text="View to left align to target's center"
app:layout_constraintBottom_toTopOf="@+id/target"
app:layout_constraintLeft_toRightOf="@+id/dummy_view"
tools:ignore="HardcodedText" />
<Button
android:id="@+id/dummy_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Dummy view"
android:visibility="gone"
app:layout_constraintLeft_toLeftOf="@+id/target"
app:layout_constraintRight_toRightOf="@+id/target"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="HardcodedText"
tools:layout_editor_absoluteY="234dp" />
</android.support.constraint.ConstraintLayout>
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