Example of dialog with stretched content body
Often I need dialog with transparent back without fixed size. It can be some text, image with unknown ratio, list of somethig. I can calculate the height, but Constraint Layout can to do it automatically. Small example:
<!--Main container with transparent background-->
<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:background="#33000000">
<android.support.constraint.ConstraintLayout
android:id="@+id/dialog_container"
android:layout_width="match_parent"
<!--Ok, i wrap to content-->
android:layout_height="wrap_content"
<!-- But I have all constraints, my bias arrange me to bottom-->
app:layout_constraintBottom_toTopOf="@id/dialog_ok"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0"
<!--And I have "match_constraint" max height and constrained Height flag!-->
app:layout_constraintHeight_max="0dp"
app:layout_constrainedHeight="true"/>
<!--Button is fixed at the bottom-->
<Button
android:id="@+id/dialog_ok"
android:layout_width="0dp"
android:layout_height="50dp"
android:background="#F00"
android:textColor="#FFF"
android:text="OK"
android:textSize="17dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</android.support.constraint.ConstraintLayout>That's all! I can attach to dialog_container some content, such as ScrollView(from fixed content), RecyclerView. My window will shrink to size of content size, or limit size of the window size.
