//StringUtils.java

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;


public static byte[] zlibCompress(byte[] data) {
    byte[] output;

    //LEVEL 5 to make it the same as iOS COMPRESSION_ZLIB
    Deflater compresser = new Deflater(5,true);

    compresser.reset();
    compresser.setInput(data);
    compresser.finish();
    ByteArrayOutputStream bos = new ByteArrayOutputStream(data.length);
    try {
        byte[] buf = new byte[1024];
        while (!compresser.finished()) {
            int i = compresser.deflate(buf);
            bos.write(buf, 0, i);
        }
        output = bos.toByteArray();
    } catch (Exception e) {
        output = data;
        e.printStackTrace();
    } finally {
        try {
            bos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    compresser.end();
    return output;
}

public static byte[] zlibDecompress(byte[] data) {
    byte[] output;

    Inflater decompresser = new Inflater(true);
    decompresser.reset();
    decompresser.setInput(data);

    ByteArrayOutputStream o = new ByteArrayOutputStream(data.length);
    try {
        byte[] buf = new byte[1024];
        while (!decompresser.finished()) {
            int i = decompresser.inflate(buf);
            o.write(buf, 0, i);
        }
        output = o.toByteArray();
    } catch (Exception e) {
        output = data;
        e.printStackTrace();
    } finally {
        try {
            o.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    decompresser.end();
    return output;
}


//decompress

String str = result.substring(AppConstants.WatchWallet.PREFIX_SIGN.length());

byte[] decodedBytes = android.util.Base64.decode(str.getBytes("UTF-8"), Base64.NO_WRAP);
qrstr_decoded = new String(StringUtils.zlibDecompress(decodedBytes));


//compress
byte[] encodedBytes = Base64.encode(StringUtils.zlibCompress(jsonstr.getBytes("utf-8")), Base64.NO_WRAP);
mQrcodeMvpPresenter.createQrcode(AppConstants.WatchWallet.PREFIX_SIGN + new String(encodedBytes));