Some evil android app (to de-shell it)

Decode.java

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Base64;
import java.util.Base64.Decoder;
import java.util.zip.InflaterInputStream;

class Decode {
    public static void main(String args[]) {
        try {
            ByteArrayOutputStream decoded = new ByteArrayOutputStream();
            InputStream inputStream = new FileInputStream("assets/enr0b7/1oo4lvs");
            inputStream.skip(4L);

            int key = inputStream.read();
            byte[] buffer = new byte[2048];
            
            while (true) {
                int count = inputStream.read(buffer);

                if (count == -1) {
                    inputStream.close();
                    break;
                }

                // xor result
                for (int i = 0; i < count; i++) {
                    buffer[i] = (byte)(buffer[i] ^ key);
                }
                decoded.write(buffer, 0, count);
            }

            // inflate the string
            ByteArrayOutputStream outStream = new ByteArrayOutputStream();
            InflaterInputStream inflater = new InflaterInputStream(new ByteArrayInputStream(decoded.toByteArray()));
            while (true) {
                int count = inflater.read(buffer);

                if (count == -1) {
                    inflater.close();
                    break;
                }

                outStream.write(buffer, 0, count);
            }

            // decode by base64
            byte[] base64Decoded = Base64.getDecoder().decode(outStream.toByteArray());

            File outFile = new File("/tmp/evil.dex");
            FileOutputStream outputStream = new FileOutputStream(outFile);
            outputStream.write(base64Decoded);
            outputStream.close();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}