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Android

In the layout below, center the ImageView by setting each "layout_constraint" item to "parent" (just fill in the blanks)

<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">

<ImageView
    android:id="@+id/imageView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:scaleType=""
    app:srcCompat="@drawable/grumpy_cat"
    app:layout_constraintTop_toTopOf=""
    app:layout_constraintBottom_toBottomOf=""
    app:layout_constraintLeft_toLeftOf=""
    app:layout_constraintRight_toRightOf="" />

<EditText
    android:id="@+id/captionField"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:ems="10"
    android:hint="Enter a caption"
    android:layout_marginTop=""
    app:layout_constraintTop_toBottomOf="@+id/imageView"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

</android.support.constraint.ConstraintLayout>

2 Answers

Alla Konstantinova
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Alla Konstantinova
Android Development Techdegree Student 2,226 Points

You just need to add the "parent" as parameter of all constraints in the ImageView too:

<ImageView
    android:id="@+id/imageView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:scaleType=""
    app:srcCompat="@drawable/grumpy_cat"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

Just add "parent"

app:layout_constraintTop_toTopOf="parent" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent"