Get metadata on images with PNG format in android

Part of an application that I am developing, has to obtain the metadata of the images for its later use in it, so far what I am using is ExifInterface , with something similar to the following:

//..

String filename = "DirectorioDondeEstaElFichero/DSC_.JPG";

  try {
   ExifInterface exif = new ExifInterface(filename);
   FiltroExif(exif);
   //ShowExif(exif);
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();

   //..
  }

  //..

  private void FiltroExif(ExifInterface exif){
     String attr="attr ---\n";

     attr += getTagString(ExifInterface.TAG_DATETIME,         exif);
     attr += getTagString(ExifInterface.TAG_GPS_LATITUDE,     exif);
     attr += getTagString(ExifInterface.TAG_GPS_LATITUDE_REF, exif);
  }

  //..

But as the documentation says at some point:

This is a class for reading and writing Exif tags in a JPEG file.

There is some known way to read the metadata of an image PNGif it is possible without using any library not provided by android, although this is not a requirement , it would also be worth it if it was not provided by android.

This is commented in case someone has done something similar or helps provide a solution:

As a last option, it would be to review the SKIA code and try to do something there "although if possible I don't know if that would be muddying my hands at least in my case "

UPDATE :

• I don't need to write metadata to the image just read it.
• If it is an external library that has time to be created or used, to avoid bugs that may appear in the process of using it (but it is not a requirement).
• An example of its use or a link to some type of documentation that indicates that it works for the purpose would also be appreciated (but it is not a requirement).