Android裁剪图片为圆形图片

Android裁剪图片为圆形图片

http://blog.csdn.net/kkmike999/article/details/16359713

2013-11-16 19:15 3234人阅读 评论(8) 收藏 举报

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/**

* 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;

left = 0;

top = 0;

right = width;

bottom = 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);// 设置画笔无锯齿



canvas.drawARGB(0, 0, 0, 0); // 填充整个Canvas

paint.setColor(color);



// 以下有两种方法画圆,drawRounRect和drawCircle

// canvas.drawRoundRect(rectF, roundPx, roundPx, paint);// 画圆角矩形，第一个参数为图形显示区域，第二个参数和第三个参数分别是水平圆角半径和垂直圆角半径。

canvas.drawCircle(roundPx, roundPx, roundPx, paint);



paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));// 设置两张图片相交时的模式,参考http://trylovecatch.iteye.com/blog/1189452

canvas.drawBitmap(bitmap, src, dst, paint); //以Mode.SRC_IN模式合并bitmap和已经draw了的Circle



return output;

}

参考流程图 & 原理图：





Demo下载：

http://download.csdn.net/detail/kkmike999/6562925