Background
I've already seen how to create a drawable that's circular out of a bitmap, and also how to add an outline (AKA stroke) around it, here.
The problem
I can't find out how to do a similar task for rounding only some of the corners of the bitmap, inside the drawable, without creating a new bitmap, and still do it for a center-crop ImageView.
What I've found
This is what I've found, but it does create a new bitmap, and when using it in an imageView with center-crop (source here):
/**
* Create rounded corner bitmap from original bitmap.
*
* @param input Original bitmap.
* @param cornerRadius Corner radius in pixel.
* @param squareTL,squareTR,squareBL,squareBR where to use square corners instead of rounded ones.
*/
public static Bitmap getRoundedCornerBitmap(final Bitmap input, final float cornerRadius, final int w, final int h,
final boolean squareTL, final boolean squareTR, final boolean squareBL, final boolean squareBR) {
final Bitmap output = Bitmap.createBitmap(w, h, Config.ARGB_8888);
final Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Rect rect = new Rect(0, 0, w, h);
final RectF rectF = new RectF(rect);
// make sure that our rounded corner is scaled appropriately
Paint paint = new Paint();
paint.setXfermode(null);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, cornerRadius, cornerRadius, paint);
// draw rectangles over the corners we want to be square
if (squareTL)
canvas.drawRect(0, 0, w / 2, h / 2, paint);
if (squareTR)
canvas.drawRect(w / 2, 0, w, h / 2, paint);
if (squareBL)
canvas.drawRect(0, h / 2, w / 2, h, paint);
if (squareBR)
canvas.drawRect(w / 2, h / 2, w, h, paint);
paint.setXfermode(PORTER_DUFF_XFERMODE_SRC_IN);
canvas.drawBitmap(input, 0, 0, paint);
return output;
}
And, this is what I've found for creating a rounded corners drawable that acts on all corners:
public static class RoundedCornersDrawable extends Drawable {
private final float mCornerRadius;
private final RectF mRect = new RectF();
private final BitmapShader mBitmapShader;
private final Paint mPaint;
public RoundedCornersDrawable(final Bitmap bitmap, final float cornerRadius) {
mCornerRadius = cornerRadius;
mBitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP,
Shader.TileMode.CLAMP);
mPaint = new Paint();
mPaint.setAntiAlias(false);
mPaint.setShader(mBitmapShader);
mRect.set(0, 0, bitmap.getWidth(), bitmap.getHeight());
}
@Override
protected void onBoundsChange(final Rect bounds) {
super.onBoundsChange(bounds);
mRect.set(0, 0, bounds.width(), bounds.height());
}
@Override
public void draw(final Canvas canvas) {
canvas.drawRoundRect(mRect, mCornerRadius, mCornerRadius, mPaint);
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
@Override
public void setAlpha(final int alpha) {
mPaint.setAlpha(alpha);
}
@Override
public void setColorFilter(final ColorFilter cf) {
mPaint.setColorFilter(cf);
}
}
But this solution only works well if the imageView shows the content while maintaining the same aspect ratio as the bitmap, and also has its size pre-determined.
The question
How to create a center-cropped drawable, that shows a bitmap, has rounded corners for specific corners, and also be able to show an outline/stroke around it?
I want to do it without creating a new bitmap or extending ImageView. Only use a drawable that has the bitmap as the input.
