Androidx Recycler View Match Constraint (0dp) With Wrap Content Behaviour

I have simple recycler view here, what I want is: when list is short: stick the button below the recycler view when list is long: stick the button bottom of screen yet recycler vie

Solution 1:

Just add this line:

app:layout_constrainedHeight="true"

to your Recyclerview as:

<androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_user_address"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="20dp"
        android:layout_marginTop="15dp"
        android:layout_marginEnd="20dp"
        app:layout_constrainedHeight="true"   <--  Add this line
        app:layout_constraintBottom_toTopOf="@id/btn"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_chainStyle="packed"
        app:layout_constraintVertical_bias="0.0"
        tools:itemCount="50"/>

Solution 2:

Try this out. First align button at the end of the layout then add app:layout_constrainedHeight="true" app:layout_constraintStart_toStartOf="parent" app:layout_constraintBottom_toTopOf="@id/btn" in our recycler view. This will make your recycler view to cover all the layout except the button which is at the bottom of the layout. Still if you don't anything you can ask me.

<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayoutxmlns: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"xmlns:tools="http://schemas.android.com/tools"><androidx.recyclerview.widget.RecyclerViewandroid:id="@+id/rv_user_address"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_marginStart="20dp"android:layout_marginTop="15dp"android:layout_marginEnd="20dp"android:layout_marginBottom="10dp"app:layout_constrainedHeight="true"app:layout_constraintBottom_toTopOf="@id/btn"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintVertical_bias="0.0"app:layout_constraintVertical_chainStyle="packed"tools:itemCount="100" /><Buttonandroid:id="@+id/btn"android:layout_width="match_parent"android:layout_height="40dp"android:layout_marginStart="20dp"android:layout_marginTop="20dp"android:layout_marginEnd="20dp"android:layout_marginBottom="20dp"android:background="#00ffff"android:gravity="center"android:orientation="horizontal"android:text="example"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintHorizontal_bias="1.0"app:layout_constraintStart_toStartOf="parent" /></androidx.constraintlayout.widget.ConstraintLayout>

Solution 3:

Change your constraint layout to linear layout. Add weight-sum to linear layout. give the desired weights to your recycler view and button.

<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns: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"android:orientation="vertical"android:weightSum="10"><androidx.recyclerview.widget.RecyclerViewandroid:id="@+id/rv_user_address"android:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="9"...
       /><Buttonandroid:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"...
        /></LinearLayout>

Just make sure the sum of all weights does not exceed your weight-sum. In the current case. Recycler view will have 90% of parent, while 10% is used by button. Feel free to play around with these number to achieve the desired results.