android 指定组件的圆角图片处理
红色框内的图片是服务器上获取到的，本身是矩形，要怎么做成仅左下方和右下方是圆角的效果呢？
下面提供了一种简单的方式
package
com.lurencun.androidsysteminfomation;
import
android.graphics.Bitmap;
import
android.graphics.Canvas;
import
android.graphics.Color;
import
android.graphics.Paint;
import
android.graphics.PorterDuffXfermode;
import
android.graphics.Rect;
import
android.graphics.RectF;
import
android.graphics.Bitmap.Config;
import
android.graphics.PorterDuff.Mode;
* <pre>
* 功能说明： android 指定组件的圆角图片处理
* 日期： 2015年1月7日
* 开发者： 左丶郁
*
* 历史记录
* 修改内容：
* 修改人员：
* 修改日期： 2015年1月7日
* </pre>
*/
public
class
BitmapFillet {
public
static
final
int
ALL =
347120
;
public
static
final
int
TOP =
547120
;
public
static
final
int
LEFT =
647120
;
public
static
final
int
RIGHT =
747120
;
public
static
final
int
BOTTOM =
847120
;
/**
*
* 指定图片的切边，对图片进行圆角处理
* @param type 具体参见：{@link BitmapFillet.ALL} , {@link BitmapFillet.TOP} ,
* {@link BitmapFillet.LEFT} , {@link BitmapFillet.RIGHT} , {@link BitmapFillet.BOTTOM}
* @param bitmap 需要被切圆角的图片
* @param roundPx 要切的像素大小
* @return
*
*/
public
static
Bitmap fillet(
int
type,Bitmap bitmap,
int
roundPx) {
try
{
// 其原理就是：先建立一个与图片大小相同的透明的Bitmap画板
// 然后在画板上画出一个想要的形状的区域。
// 最后把源图片帖上。
final
int
width = bitmap.getWidth();
final
int
height = bitmap.getHeight();
Bitmap paintingBoard = Bitmap.createBitmap(width,height, Config.ARGB_8888);
Canvas canvas =
new
Canvas(paintingBoard);
canvas.drawARGB(Color.TRANSPARENT, Color.TRANSPARENT, Color.TRANSPARENT, Color.TRANSPARENT);
final
Paint paint =
new
Paint();
paint.setAntiAlias(
true
);
paint.setColor(Color.BLACK);
if
( TOP == type ){
clipTop(canvas,paint,roundPx,width,height);
}
else
if
( LEFT == type ){
clipLeft(canvas,paint,roundPx,width,height);
}
else
if
( RIGHT == type ){
clipRight(canvas,paint,roundPx,width,height);
}
else
if
( BOTTOM == type ){
clipBottom(canvas,paint,roundPx,width,height);
}
else
{
clipAll(canvas,paint,roundPx,width,height);
}
paint.setXfermode(
new
PorterDuffXfermode(Mode.SRC_IN));
//帖子图
final
Rect src =
new
Rect(
0
,
0
, width, height);
final
Rect dst = src;
canvas.drawBitmap(bitmap, src, dst, paint);
return
paintingBoard;
}
catch
(Exception exp) {
return
bitmap;
}
}
private
static
void
clipLeft(
final
Canvas canvas,
final
Paint paint,
int
offset,
int
width,
int
height){
final
Rect block =
new
Rect(offset,
0
,width,height);
canvas.drawRect(block, paint);
final
RectF rectF =
new
RectF(
0
,
0
, offset *
2
, height);
canvas.drawRoundRect(rectF, offset, offset, paint);
}
private
static
void
clipRight(
final
Canvas canvas,
final
Paint paint,
int
offset,
int
width,
int
height){
final
Rect block =
new
Rect(
0
,
0
, width-offset, height);
canvas.drawRect(block, paint);
final
RectF rectF =
new
RectF(width - offset *
2
,
0
, width , height);
canvas.drawRoundRect(rectF, offset, offset, paint);
}
private
static
void
clipTop(
final
Canvas canvas,
final
Paint paint,
int
offset,
int
width,
int
height){
final
Rect block =
new
Rect(
0
, offset, width, height);
canvas.drawRect(block, paint);
final
RectF rectF =
new
RectF(
0
,
0
, width , offset *
2
);
canvas.drawRoundRect(rectF, offset, offset, paint);
}
private
static
void
clipBottom(
final
Canvas canvas,
final
Paint paint,
int
offset,
int
width,
int
height){
final
Rect block =
new
Rect(
0
,
0
, width, height - offset);
canvas.drawRect(block, paint);
final
RectF rectF =
new
RectF(
0
, height - offset *
2
, width , height);
canvas.drawRoundRect(rectF, offset, offset, paint);
}
private
static
void
clipAll(
final
Canvas canvas,
final
Paint paint,
int
offset,
int
width,
int
height){
final
RectF rectF =
new
RectF(
0
,
0
, width , height);
canvas.drawRoundRect(rectF, offset, offset, paint);
}
}
效果图如下：
