Android生成圆形图片

/**

* 转换图片成圆形

* @param bitmap 传入Bitmap对象

* @return

*/

public Bitmap toRoundBitmap(Bitmap bitmap)
{

int width = bitmap.getWidth();

int height = bitmap.getHeight();

float roundPx;

float left,top,right,bottom,dst_left,dst_top,dst_right,dst_bottom;

if (width <= height) {

roundPx = width / 2;

top = 0;

bottom = width;

left = 0;

right = width;

height = width;

dst_left = 0;

dst_top = 0;

dst_right = width;

dst_bottom = width;

} else {

roundPx = height / 2;

float clip = (width - height)
/ 2;

left = clip;

right = width - clip;

top = 0;

bottom = height;

width = height;

dst_left = 0;

dst_top = 0;

dst_right = height;

dst_bottom = height;

}

Bitmap output = Bitmap.createBitmap(width,

height, Config.ARGB_8888);

Canvas canvas = new Canvas(output);

final int color = 0xff424242;

final Paint paint = new Paint();

final Rect src = new Rect((int)left,
(int)top, (int)right, (int)bottom);

final Rect dst = new Rect((int)dst_left,
(int)dst_top, (int)dst_right, (int)dst_bottom);

final RectF rectF = new RectF(dst);

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, src,
dst, paint);

return output;

}