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Constraint layout

Difference between constraint and relative layout

  • Intention of ConstraintLayout is to optimize and flatten the view hierarchy of your layouts by applying some rules to each view to avoid nesting.
  • Rules remind you of RelativeLayout, for example setting the left to the left of some other view. app:layout_constraintBottom_toBottomOf="@+id/view1"
  • Unlike RelativeLayout, ConstraintLayout offers bias value that is used to position a view in terms of 0% and 100% horizontal and vertical offset relative to the handles (marked with circle). These percentages (and fractions) offer seamless positioning of the view across different screen densities and sizes. app:layout_constraintHorizontal_bias="0.33" app:layout_constraintVertical_bias="0.53"

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