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Android裁剪图片为圆形图片

2014-02-14 10:33 281 查看
以前在论坛中找过裁剪图片为圆形图片的方法,但是效果都不是很理想,这几天因为公司业务的要求,需要对头像进行裁剪以圆形的方式显示,这个方法是根据传入的图片的高度(height)和宽度(width)决定的,如果是 width <= height 时,则会裁剪高度,裁剪的区域是宽度不变高度从顶部到宽度width的长度;如果 width > height,则会裁剪宽度,裁剪的区域是高度不变,宽度是取的图片宽度的中心区域,不过不同的业务需求,对裁剪图片要求不一样,可以根据业务的需求来调整裁剪的区域。好了,不多说了,直接上代码

/**

* 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;

}

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