android常用的工具类——将图形变成圆形

本文主要讲如何将项目中的图片设置成圆形来显示，直接用封装好的如下方法即可

public static Bitmap getRoundBitmap(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; }

接下来是实战演示：

我把此函数封装在一个ImageUtil的工具类中，

iv_icon = (ImageView) findViewById(R.id.iv_icon);InputStream is = getResources().openRawResource(R.drawable.profile);  Bitmap bitmap = ImageUtil.getRoundBitmap(BitmapFactory.decodeStream(is));iv_icon.setImageBitmap(bitmap);

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