RoundedImageView.java 文件源码

@Override
    protected void onDraw(Canvas canvas) {
        float borderWidth = this.borderWidth;
        float roundWidth = this.roundWidth;
        if (borderWidth < 0) {
            borderWidth = ( getWidth() + getHeight() ) * .02f;
        }
        paint.setStrokeWidth( borderWidth );
        if (roundWidth < 0) {
            roundWidth = borderWidth * 2;
        }

        drawPath.reset();
//        drawRect.set( 0 + roundWidth / 2, 0 + roundWidth / 2, getWidth() - roundWidth / 2, getHeight() - roundWidth / 2 );
        drawRect.set( 0 + borderWidth / 2, 0 + borderWidth / 2, getWidth() - borderWidth / 2, getHeight() - borderWidth / 2 );
        drawPath.addRoundRect( drawRect, roundWidth, roundWidth, Direction.CCW );

        canvas.save();
        canvas.clipPath( drawPath );
        super.onDraw( canvas );
        canvas.restore();

        canvas.drawRoundRect( drawRect, roundWidth, roundWidth, paint );
    }