Android裁剪图片为圆形

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;

}

/**

* 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;

}