Java – Set the maximum height on the constraint layout

I have a ListView in the constraint layout. When it has more lists, limit the parent layout height. How do I programmatically set the maximum layout height for bottom_layout? Display up to 80% of the device height.

Here is the layout:

<androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/bottom_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent">

<Button
            android:id="@+id/try_again"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/primary_button"
            android:minWidth="180dp"
            android:text="@string/error_try_again"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent" />

<ListView
            android:id="@+id/instruction_list"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintBottom_toTopOf="@+id/try_again"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/instruction_subtitle" />

<TextView
            android:id="@+id/instruction_subtitle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAlignment="center"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent" />

<TextView
            android:id="@+id/instruction_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/instruction_title"
            app:layout_constraintBottom_toTopOf="@+id/instruction_subtitle"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </androidx.constraintlayout.widget.ConstraintLayout>

Tried this solution when calling onCreate, but without success:

private void BottomCardHeight(){
        DisplayMetrics metrics = Resources.getSystem().getDisplayMetrics();
        float density  = metrics.density;
        float device_height  = metrics.heightPixels / density;

bottom_layout = findViewById(R.id.bottom_layout);
        ConstraintSet set = new ConstraintSet();
        set.clone(bottom_layout);
        set.constrainMaxHeight(R.id.bottom_layout, (int) (device_height * 0.8));
         set.constrainHeight(R.id.bottom_layout, (int) (device_height * 0.8)); both not working
        set.applyTo(bottom_layout);

ConstraintLayout mConstrainLayout  = (ConstraintLayout) findViewById(R.id.bottom_layout);
        ConstraintLayout.LayoutParams lp = (ConstraintLayout.LayoutParams) mConstrainLayout.getLayoutParams();
        lp.matchConstraintMaxHeight = (int) (device_height * 0.8);
        mConstrainLayout.setLayoutParams(lp);
    }

You can do this by wrapping the ConstraintLayout in another layout whose height matches the height of the screen.

Then add the following constraint to the internal ConstraintLayout to get a maximum height of 80% of the total screen height. This requires a height that matches the constraint

android:layout_height="0dp"
app:layout_constraintHeight_max="wrap"
app:layout_constraintHeight_percent="0.8"

Therefore, the external layout will be:

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/bottom_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

<androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_max="wrap"
        app:layout_constraintHeight_percent="0.8"
        app:layout_constraintStart_toStartOf="parent">

<!-- other views -->

</androidx.constraintlayout.widget.ConstraintLayout>

</androidx.constraintlayout.widget.ConstraintLayout>