How could i stop a Thread in android

private progressDialog progressdialog=null;

progressdialog=new ProgressDialog(this);
progressdialog.setCancelable(true);
progressdialog.setMessage("Synching....");
progressdialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressdialog.setProgress(0);
progressdialog.setMax(100);

progressdialog.show();
final Thread syncThread = new Thread(new Runnable(){
public void run(){
try{
    //Here i calling some functions and do some process
}catch(Exception e){
    e.printStackTrace();
}										
progressdialog.setProgress(100);
progressdialog.dismiss();
}
});
syncThread.start();