/** * Created by lz on 2018/10/29. * 功能描述: 自定义绘制圆形图片 */ public class CircleImageView extends View { private static final float WIDTH = Utils.dp2px(300); private static final float PADDING = Utils.dp2px(50); private static final float EDGE_WIDTH = Utils.dp2px(10); Xfermode xfermode = new PorterDuffXfermode(PorterDuff.Mode.SRC_IN); private Bitmap mBitmap; Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); RectF saveArea = new RectF(); public CircleImageView(Context context, @Nullable AttributeSet attrs) { super(context, attrs); } { mBitmap = getAvatar((int) WIDTH); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); saveArea.set(PADDING,PADDING,PADDING+WIDTH,PADDING+WIDTH); } @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //canvas.drawOval(PADDING,PADDING,PADDING+WIDTH,PADDING+WIDTH,paint); //https://blog.csdn.net/cquwentao/article/details/51423371 int saved = canvas.saveLayer(saveArea,paint); //canvas.drawOval(PADDING+EDGE_WIDTH,PADDING+EDGE_WIDTH,PADDING+WIDTH-EDGE_WIDTH,PADDING+WIDTH-EDGE_WIDTH,paint); canvas.drawOval(PADDING,PADDING,PADDING+WIDTH,PADDING+WIDTH,paint); paint.setXfermode(xfermode); canvas.drawBitmap(mBitmap,PADDING,PADDING,paint); paint.setXfermode(null); canvas.restoreToCount(saved); } Bitmap getAvatar(int width) { BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeResource(getResources(), R.drawable.img, options); options.inJustDecodeBounds = false; options.inDensity = options.outWidth; options.inTargetDensity = width; return BitmapFactory.decodeResource(getResources(), R.drawable.img, options); } }
