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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | public class CircleView extends ImageView { private Paint mPaint = new Paint(); public CircleView(Context context, AttributeSet attrs) { super(context, attrs); } @Override protected void onDraw(Canvas canvas) { Drawable mDrawable = getDrawable();//获取xml文件设置的图片 if (null == mDrawable) super.onDraw(canvas);//如果为空，交给父类处理 Bitmap mBitmap = ((BitmapDrawable) mDrawable).getBitmap();//将图片转化成bitmap int len = getWidth() < getHeight() ? getWidth() : getHeight();//获取xml的长宽属性值，选择较小的 Bitmap tempBitmap = Bitmap.createBitmap(len, len, Bitmap.Config.ARGB_8888);//新建一个bitmap对象，作为缓存 Canvas mCanvas = new Canvas(tempBitmap);//新建画布缓存bitmap对象 mPaint.setAntiAlias(true);//抗锯齿 mCanvas.drawCircle(len / 2, len / 2, len / 2, mPaint);//画一个圆 mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));//设置画笔的覆盖类型 Matrix matrix = new Matrix(); // 初始化Matrix对象 matrix.setScale((float) len / mBitmap.getWidth(), (float) len / mBitmap.getHeight()); //设置缩放比例 mCanvas.drawBitmap(mBitmap, matrix, mPaint);//画出缩放后的图片 mPaint.reset();//重置画笔 canvas.drawBitmap(tempBitmap, 0, 0, mPaint);//绘制缓存图片 }} |