How to make a view with rounded corners?

Question

I am trying to make a view in android with rounded edges. The solution I found so far is to define a shape with rounded corners and use it as the background of that view.

Answer 1

With the Material Components Library the best way to make a View with rounded corners is to use the MaterialShapeDrawable.

Create a ShapeAppearanceModel with custom rounded corners:

ShapeAppearanceModel shapeAppearanceModelLL1 = new ShapeAppearanceModel()
        .toBuilder()
        .setAllCorners(CornerFamily.ROUNDED,radius16)
        .build();

Create a MaterialShapeDrawable:

MaterialShapeDrawable shapeDrawableLL1 = new MaterialShapeDrawable(shapeAppearanceModeLL1);

If you want to apply also an elevationOverlay for the dark theme use this:

MaterialShapeDrawable shapeDrawableLL1 = MaterialShapeDrawable.createWithElevationOverlay(this, 4.0f);
shapeDrawableLL1.setShapeAppearanceModel(shapeAppearanceModelLL1);

Optional: apply to the shapeDrawable a background color and a stroke

shapeDrawableLL1.setFillColor(
       ContextCompat.getColorStateList(this,R.color...));
 shapeDrawableLL1.setStrokeWidth(2.0f);
 shapeDrawableLL1.setStrokeColor(
       ContextCompat.getColorStateList(this,R.color...));

Finally apply the shapeDrawable as background in your LinearLayout (or other view):

LinearLayout linearLayout1= findViewById(R.id.ll_1);
ViewCompat.setBackground(linearLayout1,shapeDrawableLL1);