android之将图片转化为圆形图片

最新推荐文章于 2024-12-05 21:08:30 发布

原创最新推荐文章于 2024-12-05 21:08:30 发布 · 259 阅读

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本文介绍了一种使用Android Canvas实现图片圆角效果的方法。通过创建一个带有圆角的Bitmap，并利用Paint进行绘制，最终实现了对原始图片的圆角裁剪效果。

bitmap = ((BitmapDrawable)imageView1.getDrawable()).getBitmap();
bitmap = getRoundedCornerBitmap(bitmap);
imageView1.setImageBitmap(bitmap);

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
bitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);

final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = bitmap.getWidth() / 2;

paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}