Aerrow Aerrow - 7 months ago 84
Android Question

Border over a bitmap with rounded corners in Android

I used the below to make a bitmap with rounded corners. Now I want to draw a line around the bitmap.

private BitmapDrawable roundCornered(BitmapDrawable scaledBitmap, int i) {

Bitmap bitmap = scaledBitmap.getBitmap();

result = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(),
canvas = new Canvas(result);

color = 0xff424242;
paint = new Paint();
rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
rectF = new RectF(rect);
roundPx = i;
canvas.drawARGB(0, 0, 0, 0);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
BitmapDrawable finalresult = new BitmapDrawable(result);
return finalresult;

I got the image below, but my actual need is that I must draw a border around the image.

Answer Source

I put the following together for myself.

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int color, int cornerDips, int borderDips, Context context) {
    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(),
    Canvas canvas = new Canvas(output);

    final int borderSizePx = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, (float) borderDips,
    final int cornerSizePx = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, (float) cornerDips,
    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
    final RectF rectF = new RectF(rect);

    // prepare canvas for transfer
    canvas.drawARGB(0, 0, 0, 0);
    canvas.drawRoundRect(rectF, cornerSizePx, cornerSizePx, paint);

    // draw bitmap
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint);

    // draw border
    paint.setStrokeWidth((float) borderSizePx);
    canvas.drawRoundRect(rectF, cornerSizePx, cornerSizePx, paint);

    return output;

Credits, of course, to

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