??? 在开发中,为了让图片效果美观,有时需要对图片做一些处理。圆角就是一种常用的效果处理。对于图片做圆角处理的方法很多,下面从绘制的角度做简单介绍,主要代码如下:
public Bitmap getRoundedCornerBitmap(Bitmap sourceBitmap) { try { Bitmap targetBitmap = Bitmap.createBitmap(sourceBitmap.getWidth(), sourceBitmap.getHeight(), Config.ARGB_8888); // 得到画布 Canvas canvas = new Canvas(targetBitmap); // 创建画笔 Paint paint = new Paint(); paint.setAntiAlias(true); // 值越大角度越明显 float roundPx = 30; float roundPy = 30; Rect rect = new Rect(0, 0, sourceBitmap.getWidth(), sourceBitmap.getHeight()); RectF rectF = new RectF(rect); // 绘制 canvas.drawARGB(0, 0, 0, 0); canvas.drawRoundRect(rectF, roundPx, roundPy, paint); paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); canvas.drawBitmap(sourceBitmap, rect, rect, paint); return targetBitmap; } catch (Exception e) { e.printStackTrace(); } catch (Error e) { e.printStackTrace(); } return null; }
???? 使用方法比较简单:
ImageView image = (ImageView) findViewById(R.id.imageView1); Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.image); image.setImageBitmap(getRoundedCornerBitmap(bitmap));? ? ? ? ? ? ? ? // 回收Bitmap资源? ? ? ? ? ? ? ? if (bitmap != null && !bitmap.isRecycled()) { bitmap.recycle(); bitmap = null; }
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