Align FrameLayout inside ConstraintLayout to bottom

Question

I want a layout above recycler view at the bottom of the screen,(like a frame) so that even when that layout is visible I can still scroll recycler view behind it. So I want to align the frame layout at the bottom of the screen and make it visible and invisible as per requirement. Here is my code.

 <?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"     tools:context="com.protossoft.root.aesencryption.MainActivity">        <ListView         android:layout_width="match_parent"         android:id="@+id/listView"         android:layout_height="match_parent">      </ListView>    <!--  <RelativeLayout         android:layout_width="match_parent"          android:layout_height="wrap_content">-->     <FrameLayout         android:layout_width="match_parent"          android:layout_height="wrap_content"         tools:layout_editor_absoluteX="0dp"         tools:layout_editor_absoluteY="443dp">          <LinearLayout             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:layout_margin="10dp"             android:gravity="center"             android:orientation="horizontal">              <ImageView                 android:id="@+id/deviceNumberImage"                 android:layout_width="0dp"                 android:layout_height="wrap_content"                 android:layout_weight="0.2"                 android:src="@android:drawable/btn_default" />              <TextView                 android:id="@+id/deviceNumber"                 android:layout_width="0dp"                 android:layout_height="wrap_content"                 android:layout_weight="0.8"                 android:text="990000862471854" />          </LinearLayout>     </FrameLayout>    <!-- </RelativeLayout>--> 

I don't have too much of idea about constraint layout, but when I am moving the view at the bottom from the editor, it is using property like

tools:layout_editor_absoluteX="0dp"     tools:layout_editor_absoluteY="443dp" 

I want to achieve the same with some property like align_parentBottom. But none of the properties is available for use. What do I need to do so that the frame layout is visible at the bottom and on the top of recycler view at the same time? Thanks :)

Answer 1

I want to achieve the same with some property like align_parentBottom.

You should use app:layout_constraintBottom_toBottomOf="parent" attribute.

Here's the setup that you need:

<?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">      <FrameLayout         android:layout_width="0dp"         android:layout_height="wrap_content"         app:layout_constraintBottom_toBottomOf="parent"         app:layout_constraintEnd_toEndOf="parent"         app:layout_constraintStart_toStartOf="parent">         ...     </FrameLayout>  </android.support.constraint.ConstraintLayout>