Cannot resolve Base64.encodeToString
<p>I am trying to save images on firebase using code below.  </p>

<pre><code>  Bitmap bm = BitmapFactory.decodeFile(imgDecodableString);
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  bm.compress(Bitmap.CompressFormat.JPEG,100,baos);
  byte[] byteArray =  baos.toByteArray();
  String encodedImage = Base64.encodeToString(byteArray,Base64.DEFAULT);
</code></pre>

<p>But i am facing an error :</p>

<pre><code>cannot resolve method 'encodeToString(byte[],?)' 
cannot resolve symbol 'DEFAULT'
</code></pre>

<p>How to fix this error.   </p>