以前在eoe論壇中找過裁剪圖片為圓形圖片的方法，但是效果都不是很理想，這幾天因為公司業(yè)務(wù)的要求，需要對頭像進(jìn)行裁剪以圓形的方式顯示，這個方法是根據(jù)傳入的圖片的高度（height）和寬度（width）決定的，如果是 width <= height時，則會裁剪高度，裁剪的區(qū)域是寬度不變高度從頂部到寬度width的長度；如果 width > height，則會裁剪寬度，裁剪的區(qū)域是高度不變，寬度是取的圖片寬度的中心區(qū)域，不過不同的業(yè)務(wù)需求，對裁剪圖片要求不一樣，可以根據(jù)業(yè)務(wù)的需求來調(diào)整裁剪的區(qū)域。
好了，不多說了，直接上代碼
/**
* 轉(zhuǎn)換圖片成圓形
* @param bitmap 傳入Bitmap對象
* @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;
}
