// Create a new class or add your code to an existing class

// You may need these imports:
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.FileOutputStream;
import java.io.File;
import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;

// Set buffer size
// STREAM_BUFFER's bigger value consumes more heaps but decrease loops,
// smaller value consumes less heaps but increase loops. Optimize to your needs.
private int STREAM_BUFFER = 512000;

public boolean BackupDatabase(){
    boolean success = false;
    try{
        // Get SQL DUMP data
        String dump = getServerDumpData("myhost", "3306", "username", "userpassword", "databasename");
        if(  !dump.isEmpty() ){        // or check length like dump.length() > 256
            byte[] data = dump.getBytes();
            // Set backup folder, this is just an example
            String rootpath = System.getProperty("user.dir") + "\\backup\";
            if( isOSX() ){
                rootpath = System.getProperty("user.dir") + "/backup/";
            }
            // See if backup folder exists
            File file = new File(rootpath);
            if( !file.isDirectory() ){
                // Create backup folder when missing. Write access is needed.
                file.mkdir();              
            }
            // Compose full path, create a filename as you wish
            DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");
            Date date = new Date();
            String filepath = rootpath + "backup-" + dateFormat.format(date) + ".sql";
            // Write SQL DUMP file
            File filedst = new File(filepath);
            FileOutputStream dest = new FileOutputStream(filedst);
            dest.write(data);
            dest.close();
            success = true;
        }

   }catch (Exception ex){
        ex.printStackTrace();
   }
    return success;
}

public String getServerDumpData(String host, String port, String user, String password, String db) {
    StringBuilder dumpdata = new StringBuilder();
    String execline = "";
    try {
        if( host!=null && user!=null && password!=null && db!=null){
            // Set path. Set location of mysqldump
            //  For example: current user folder and lib subfolder            
            if( isOSX() ){
                execline = System.getProperty("user.dir") + "/lib/mysqldump";
            }else{
                execline = System.getProperty("user.dir") + "\\lib\\mysqldump.exe";
            }
            // Usage: mysqldump [OPTIONS] database [tables]
            // OR     mysqldump [OPTIONS] --databases [OPTIONS] DB1 [DB2 DB3...]
            // OR     mysqldump [OPTIONS] --all-databases [OPTIONS]
            String command[] = new String[]{ execline,
                            "--host=" + host,
                            "--port=" + port,
                            "--user=" + user,
                            "--password=" + password,
                            "--compact",
                            "--complete-insert",
                            "--extended-insert",
                            "--skip-comments",
                            "--skip-triggers",
                            db };

            // Run mysqldump
            ProcessBuilder pb = new ProcessBuilder(command);
            Process process = pb.start();

            InputStream in = process.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(in));

            int count;
            char[] cbuf = new char[STREAM_BUFFER];

            // Read datastream
            while ((count = br.read(cbuf, 0, STREAM_BUFFER)) != -1){
                dumpdata.append(cbuf, 0, count);
            }
            // Close
            br.close();
            in.close();
        }

    } catch (Exception ex) {
        // Handle exception as you wish
        ex.printStackTrace();
        return "";
    }
    return dumpdata.toString();
}

// Add some code to it when you need to look for Android, Windows, OS X etc. versions...
private boolean isOSX(){
    String lcOSName = System.getProperty("os.name").toLowerCase();
    return lcOSName.startsWith("mac os x");
}