android中对Bitmap图片设置任意角为圆角 _Android

古人已用三冬足，年少今开万卷余。这篇文章主要讲述android中对Bitmap图片设置任意角为圆角相关的知识，希望能为你提供帮助。
http://blog.csdn.net/l448288137/article/details/48276681
最近项目开发中使用到了圆角图片，网上找到的圆角图片控件大多比较死板，只可以全圆角。其中感觉最好的也就是半圆角链接在这里。想了一下，我自己在这个的基础上进行了一点改进，使得图片可以设置任意角为圆角。
先上效果图：
【android中对Bitmap图片设置任意角为圆角】
核心代码

[java] view plain copy

package fillet.sgn.com.filletimage;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
/**
* Created by liujinhua on 15/9/7.
*/
public class BitmapFillet {
public static final int CORNER_NONE = 0;
public static final int CORNER_TOP_LEFT = 1;
public static final int CORNER_TOP_RIGHT = 1 < < 1;
public static final int CORNER_BOTTOM_LEFT = 1 < < 2;
public static final int CORNER_BOTTOM_RIGHT = 1 < < 3;
public static final int CORNER_ALL = CORNER_TOP_LEFT | CORNER_TOP_RIGHT | CORNER_BOTTOM_LEFT | CORNER_BOTTOM_RIGHT;
public static final int CORNER_TOP = CORNER_TOP_LEFT | CORNER_TOP_RIGHT;
public static final int CORNER_BOTTOM = CORNER_BOTTOM_LEFT | CORNER_BOTTOM_RIGHT;
public static final int CORNER_LEFT = CORNER_TOP_LEFT | CORNER_BOTTOM_LEFT;
public static final int CORNER_RIGHT = CORNER_TOP_RIGHT | CORNER_BOTTOM_RIGHT;
public static Bitmap fillet(Bitmap bitmap, int roundPx,int corners) {
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, Bitmap.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);
//画出4个圆角
final RectF rectF = new RectF(0, 0, width, height);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
//把不需要的圆角去掉
int notRoundedCorners = corners ^ CORNER_ALL;
if ((notRoundedCorners & CORNER_TOP_LEFT) != 0) {
clipTopLeft(canvas,paint,roundPx,width,height);
}
if ((notRoundedCorners & CORNER_TOP_RIGHT) != 0) {
clipTopRight(canvas, paint, roundPx, width, height);
}
if ((notRoundedCorners & CORNER_BOTTOM_LEFT) != 0) {
clipBottomLeft(canvas,paint,roundPx,width,height);
}
if ((notRoundedCorners & CORNER_BOTTOM_RIGHT) != 0) {
clipBottomRight(canvas, paint, roundPx, width, height);
}
paint.setXfermode(new PorterDuffXfermode(PorterDuff.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 clipTopLeft(final Canvas canvas, final Paint paint, int offset, int width, int height) {
final Rect block = new Rect(0, 0, offset, offset);
canvas.drawRect(block, paint);
}
private static void clipTopRight(final Canvas canvas, final Paint paint, int offset, int width, int height) {
final Rect block = new Rect(width - offset, 0, width, offset);
canvas.drawRect(block, paint);
}
private static void clipBottomLeft(final Canvas canvas, final Paint paint, int offset, int width, int height) {
final Rect block = new Rect(0, height - offset, offset, height);
canvas.drawRect(block, paint);
}
private static void clipBottomRight(final Canvas canvas, final Paint paint, int offset, int width, int height) {
final Rect block = new Rect(width - offset, height - offset, width, height);
canvas.drawRect(block, paint);
}
}

android中对Bitmap图片设置任意角为圆角

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