Android中使用Bitmap类将矩形图片转为圆形的方法

来源：互联网发布：尼古丁的好处知乎编辑：程序博客网时间：2024/05/18 03:40

一般要做正圆形图片，只能是正方形的基础上才能实现，否则就变成椭圆了，下面说说如何使长方形的图片生成正圆形图片

public class CircleTransform implements Transformation {@Overridepublic Bitmap transform(Bitmap source) {    int size = Math.min(source.getWidth(), source.getHeight());    int x = (source.getWidth() - size) / 2;    int y = (source.getHeight() - size) / 2;    Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);    if (squaredBitmap != source) {        source.recycle();    }    Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig() != null            ? source.getConfig() : Bitmap.Config.ARGB_8888);    Canvas canvas = new Canvas(bitmap);    Paint paint = new Paint();    BitmapShader shader = new BitmapShader(squaredBitmap,            BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);    paint.setShader(shader);    paint.setAntiAlias(true);    float r = size / 2f;    canvas.drawCircle(r, r, r, paint);    squaredBitmap.recycle();    return bitmap;}@Overridepublic String key() {    return "circle";}}

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