Question

I have a simple SQLite database on my PC containing one table. I have the same SQLite database in my Android app. The data changes on the PC version of the database from time to time. How do I go about syncing the data from the SQLite database on the PC to the SQLite database on the Android device?

Answer 1

This is a simple solution with sockets:

1. Server side :

   ServerSocket servsock = new ServerSocket(2004);
   while (true) {
     System.out.println("Waiting...");
     Socket sock = servsock.accept();
     System.out.println("Accepted connection : " + sock);
     BufferedReader input = new BufferedReader(
               new InputStreamReader(sock.getInputStream()));
     String serverResponse = input.readLine(); 
     // sendfile
     File   myFile = new File("C://XXXX/XXXX/XXXXX.db");
     byte [] mybytearray  = new byte [(int)myFile.length()];
     FileInputStream fis = new FileInputStream(myFile);
     BufferedInputStream bis = new BufferedInputStream(fis);
     bis.read(mybytearray,0,mybytearray.length);
     OutputStream os = sock.getOutputStream();
     System.out.println("Sending...");
     os.write(mybytearray,0,mybytearray.length);
     os.flush();
     sock.close();
     }
   

2. Client side :

       private String serverIpAddress = "xxx.xxx.xxx.xxx";
   private static final int REDIRECTED_SERVERPORT = 2004;
   InetAddress serverAddr = InetAddress.getByName(serverIpAddress);
   socket = new Socket(serverAddr, REDIRECTED_SERVERPORT);
   int filesize = 6022386;
   int bytesRead;
   int current = 0;
   byte[] mybytearray = new byte[filesize];
   
   InputStream is = socket.getInputStream();
   
   BufferedReader input = new BufferedReader(new InputStreamReader(is));
   FileOutputStream fos = new FileOutputStream(
           "/data/data/XXXXX/databases/XXXXX.db");
   BufferedOutputStream bos = new BufferedOutputStream(fos);
   
   bytesRead = is.read(mybytearray, 0, mybytearray.length);
   current = bytesRead;
   
   do {
       bytesRead = is.read(mybytearray, current,
               (mybytearray.length - current));
       if (bytesRead >= 0)
           current += bytesRead;
   } while (bytesRead > -1);
   
   bos.write(mybytearray, 0, current);
   bos.flush();
   bos.close();
   socket.close();