This is almost the simplest SVG you can get from Inkscape: a solid filled circle with no stroke. The drawing is 24x24px, the circle is a bit smaller than that. It won't import into Android Studio's Vector Asset Studio.

circle_24.svg

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- Created with Inkscape (http://www.inkscape.org/) -->

<svg
   xmlns:dc="http://purl.org/dc/elements/1.1/"
   xmlns:cc="http://creativecommons.org/ns#"
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   xmlns:svg="http://www.w3.org/2000/svg"
   xmlns="http://www.w3.org/2000/svg"
   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
   width="24"
   height="24"
   id="svg2"
   version="1.1"
   inkscape:version="0.91+devel r"
   sodipodi:docname="circle_24.svg"
   viewBox="0 0 24 24">
  <defs
     id="defs4" />
  <sodipodi:namedview
     id="base"
     pagecolor="#ffffff"
     bordercolor="#666666"
     borderopacity="1.0"
     inkscape:pageopacity="0.0"
     inkscape:pageshadow="2"
     inkscape:zoom="50.833333"
     inkscape:cx="12"
     inkscape:cy="12"
     inkscape:document-units="px"
     inkscape:current-layer="layer1"
     showgrid="true"
     inkscape:window-width="956"
     inkscape:window-height="1152"
     inkscape:window-x="0"
     inkscape:window-y="206"
     inkscape:window-maximized="0"
     units="px">
    <inkscape:grid
       type="xygrid"
       id="grid4686"
       spacingx="0.5"
       spacingy="0.5"
       empspacing="2" />
  </sodipodi:namedview>
  <metadata
     id="metadata7">
    <rdf:RDF>
      <cc:Work
         rdf:about="">
        <dc:format>image/svg+xml</dc:format>
        <dc:type
           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
        <dc:title></dc:title>
      </cc:Work>
    </rdf:RDF>
  </metadata>
  <g
     inkscape:label="Layer 1"
     inkscape:groupmode="layer"
     id="layer1"
     transform="translate(0,-1028.3622)">
    <path
       style="opacity:1;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.01;stroke-linecap:square;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1"
       id="path4688"
       sodipodi:type="arc"
       sodipodi:cx="12"
       sodipodi:cy="1040.3622"
       sodipodi:rx="11"
       sodipodi:ry="11"
       sodipodi:start="0"
       sodipodi:end="6.2776526"
       sodipodi:open="true"
       d="m 23,1040.3622 a 11,11 0 0 1 -10.984785,11 11,11 0 0 1 -11.0151729,-10.9696 11,11 0 0 1 10.9543129,-11.0303 11,11 0 0 1 11.045477,10.939" />
  </g>
</svg>