How to programmatically create a round cornered border using ShapeDrawable in android?
android, border, drawable, java, shapedrawable
Solution
If you need evenly rounded corners (and from your example it seems you do) you can simply use GradentDrawable with a solid color
GradientDrawable gd = new GradientDrawable();
gd.setColor(Color.RED);
gd.setCornerRadius(10);
gd.setStroke(2, Color.WHITE);
view.setBackground(gd);
GradientDrawable documentation can be found here.
Edit: For each corner separately
You can specify radius of each corner separately using `setCornerRadii (float[] radii)` method. "For each corner, the array contains 2 values, [X_radius, Y_radius]. The corners are ordered top-left, top-right, bottom-right, bottom-left. This property is honored only when the shape is of type RECTANGLE.
It is recommended to invoke `mutate()` before changing this property.
Problem
I need to create a border with rounded corners programatically by extending ShapeDrawable. I need to have a black border with rounded corners with the pixels on the outside being white and the inner pixels being transparent. The code I have at the moment has multiple problems, of which are that it does not create a smooth corner that is the same thickness as the border and that the outer pixels of the border are transparent and not white. Here is a picture of the corners I am currently getting Here is the code where I am passing Color.TRANSPARENT for 'fill' in the constructor: ``` public class CustomShape extends ShapeDrawable { private final Paint fillpaint, strokepaint; public CustomShape(int fill, int strokeWidth,int radius) { super(new RoundRectShape(new float[] { radius, radius, radius, radius, radius, radius, radius, radius }, null, null)); fillpaint = new Paint(this.getPaint()); fillpaint.setColor(fill); strokepaint = new Paint(fillpaint); strokepaint.setStyle(Paint.Style.STROKE); strokepaint.setStrokeWidth(strokeWidth); strokepaint.setColor(Color.BLACK); } @Override protected void onDraw(Shape shape, Canvas canvas, Paint paint) { shape.draw(canvas, fillpaint); shape.draw(canvas, strokepaint); } ``` }