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Here I am going to show some examples on how to use "pixymeta-android" library:

	public class TestPixyMetaAndroid {
		// Obtain a logger instance
		private static final Logger LOGGER = LoggerFactory.getLogger(TestPixyMetaAndroid.class);
		
		public static void main(String[] args) throws IOException {
			Map<MetadataType, Metadata> metadataMap = Metadata.readMetadata(args[0]);
			LOGGER.info("Start of metadata information:");
			LOGGER.info("Total number of metadata entries: {}", metadataMap.size());
			
			int i = 0;
			for(Map.Entry<MetadataType, Metadata> entry : metadataMap.entrySet()) {
				LOGGER.info("Metadata entry {} - {}", i, entry.getKey());
				entry.getValue().showMetadata();
				i++;
				LOGGER.info("-----------------------------------------");
			}
			LOGGER.info("End of metadata information.");

			FileInputStream fin = null;
			FileOutputStream fout = null;
			
			if(metadataMap.get(MetadataType.XMP) != null) {
				XMP xmp = (XMP)metadataMap.get(MetadataType.XMP);
				Document xmpDoc = xmp.getXmpDocument();
				fin = new FileInputStream("images/1.jpg");
				fout = new FileOutputStream("1-xmp-inserted.jpg");
				if(!xmp.hasExtendedXmp())
                    // Metadata.insertXMP(fin, fout, xmp);
					Metadata.insertXMP(fin, fout, XMLUtils.serializeToString(xmpDoc.getDocumentElement(), "UTF-8"));
				else {
					Document extendedXmpDoc = xmp.getExtendedXmpDocument();
					JPEGMeta.insertXMP(fin, fout, XMLUtils.serializeToString(xmpDoc.getDocumentElement(), "UTF-8"), XMLUtils.serializeToString(extendedXmpDoc));
				}
				fin.close();
				fout.close();
			}
			
			Metadata.extractThumbnails("images/iptc-envelope.tif", "iptc-envelope");
		
			fin = new FileInputStream("images/iptc-envelope.tif");
			fout = new FileOutputStream("iptc-envelope-iptc-inserted.tif");
				
			Metadata.insertIPTC(fin, fout, createIPTCDataSet(), true);
			
			fin.close();
			fout.close();
			
			fin = new FileInputStream("images/wizard.jpg");
			fout = new FileOutputStream("wizard-iptc-inserted.jpg");
			
			Metadata.insertIPTC(fin, fout, createIPTCDataSet(), true);
			
			fin.close();
			fout.close();
			
			fin = new FileInputStream("images/1.jpg");
			fout = new FileOutputStream("1-irbthumbnail-inserted.jpg");
			
			Metadata.insertIRBThumbnail(fin, fout, createThumbnail("images/1.jpg"));
			
			fin.close();
			fout.close();
			
			fin = new FileInputStream("images/f1.tif");
			fout = new FileOutputStream("f1-irbthumbnail-inserted.tif");
			
			Metadata.insertIRBThumbnail(fin, fout, createThumbnail("images/f1.tif"));
			
			fin.close();
			fout.close();		

			fin = new FileInputStream("images/exif.tif");
			fout = new FileOutputStream("exif-exif-inserted.tif");
			
			Metadata.insertExif(fin, fout, populateExif(TiffExif.class), true);
			
			fin.close();
			fout.close();
			
			fin = new FileInputStream("images/12.jpg");
			fout = new FileOutputStream("12-exif-inserted.jpg");

			Metadata.insertExif(fin, fout, populateExif(JpegExif.class), true);
			
			fin.close();
			fout.close();
			
			fin = new FileInputStream("images/table.jpg");
			fout = new FileOutputStream("table-metadata-removed.jpg");
			
			Metadata.removeMetadata(fin, fout, MetadataType.IPTC, MetadataType.PHOTOSHOP, MetadataType.ICC_PROFILE, MetadataType.XMP, MetadataType.EXIF);
			
			fin.close();
			fout.close();
			
			fin = new FileInputStream("images/12.jpg");
			fout = new FileOutputStream("12-photoshop-iptc-inserted.jpg");
			
			Metadata.insertIRB(fin, fout, createPhotoshopIPTC(), true);
			
			fin.close();
			fout.close();
			
			fin = new FileInputStream("images/table.jpg");
			JPEGMeta.extractDepthMap(fin, "table");
			
			fin.close();
		}
		
		private static List<IPTCDataSet> createIPTCDataSet() {
			List<IPTCDataSet> iptcs = new ArrayList<IPTCDataSet>();
			iptcs.add(new IPTCDataSet(IPTCApplicationTag.COPYRIGHT_NOTICE, "Copyright 2014-2015, yuwen_66@yahoo.com"));
			iptcs.add(new IPTCDataSet(IPTCApplicationTag.CATEGORY, "ICAFE"));
			iptcs.add(new IPTCDataSet(IPTCApplicationTag.KEY_WORDS, "Welcome 'icafe' user!"));
			
			return iptcs;
		}
		
		private static List<_8BIM> createPhotoshopIPTC() {
			IPTC_NAA iptc = new IPTC_NAA();
			iptc.addDataSet(new IPTCDataSet(IPTCApplicationTag.COPYRIGHT_NOTICE, "Copyright 2014-2015, yuwen_66@yahoo.com"));
			iptc.addDataSet(new IPTCDataSet(IPTCApplicationTag.KEY_WORDS, "Welcome 'icafe' user!"));
			iptc.addDataSet(new IPTCDataSet(IPTCApplicationTag.CATEGORY, "ICAFE"));
			
			return new ArrayList<_8BIM>(Arrays.asList(iptc));
		}
		
		private static Bitmap createThumbnail(String filePath) throws IOException {
			FileInputStream fin = null;
			try {
				fin = new FileInputStream(filePath);
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			}
			
			Bitmap thumbnail = MetadataUtils.createThumbnail(fin);
			
			fin.close();
			
			return thumbnail;
		}
		
		// This method is for testing only
		private static Exif populateExif(Class<?> exifClass) throws IOException {
			// Create an EXIF wrapper
			Exif exif = exifClass == (TiffExif.class)?new TiffExif() : new JpegExif();
			exif.addImageField(TiffTag.WINDOWS_XP_AUTHOR, FieldType.WINDOWSXP, "Author");
			exif.addImageField(TiffTag.WINDOWS_XP_KEYWORDS, FieldType.WINDOWSXP, "Copyright;Author");
			DateFormat formatter = new SimpleDateFormat("yyyy:MM:dd HH:mm:ss");
			exif.addExifField(ExifTag.EXPOSURE_TIME, FieldType.RATIONAL, new int[] {10, 600});
			exif.addExifField(ExifTag.FNUMBER, FieldType.RATIONAL, new int[] {49, 10});
			exif.addExifField(ExifTag.ISO_SPEED_RATINGS, FieldType.SHORT, new short[]{273});
			//All four bytes should be interpreted as ASCII values - represents [0220] - new byte[]{48, 50, 50, 48}
			exif.addExifField(ExifTag.EXIF_VERSION, FieldType.UNDEFINED, "0220".getBytes());
			exif.addExifField(ExifTag.DATE_TIME_ORIGINAL, FieldType.ASCII, formatter.format(new Date()));
			exif.addExifField(ExifTag.DATE_TIME_DIGITIZED, FieldType.ASCII, formatter.format(new Date()));
			exif.addExifField(ExifTag.FOCAL_LENGTH, FieldType.RATIONAL, new int[] {240, 10});		
			// Insert ThumbNailIFD
			// Since we don't provide thumbnail image, it will be created later from the input stream
			exif.setThumbnailRequired(true);
			
			return exif;
		}
	}

Note: the examples will not work out of the box with Android application. They are here just to demonstrate how the library can be used generally. Check out the repository MyAndroidApp for a working example.