How to make a view scale depending on the occupied space (flexible layouts)?

Use ConstraintLayout with 0dp constraints (MATCH_CONSTRAINT) for width/height and layout_constraintHorizontal_bias / layout_constraintVertical_bias. You can also use LinearLayout with weights (layout_weight).

Other approaches:

• RecyclerView / ListView with different item types.
• FlexboxLayout from Google.
• Programmatically calculate sizes in onCreate or onMeasure.