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J2ME Record Listener
Posted on: December 2, 2008 By Deepak Kumar

This application illustrates to implement the RecordListener interface with the RecordStore class for receiving Record Changed, Added, Deleted events from a record store.

J2ME Record Listener

This application illustrates to implement the RecordListener interface with the RecordStore class for receiving Record Changed, Added, Deleted events from a record store. The Record Listener interface having the following methods:

recordAdded(RecordStore recordStore, int recordId)
recordChanged(RecordStore recordStore, int recordId)
recordDeleted(RecordStore recordStore, int recordId)

In this example we are going to recordAdded(), recordDeleted() and recordChanged() the data.

The Application is as follows:

RMSListener.java


import java.io.*;

import javax.microedition.midlet.*;

import javax.microedition.rms.*;



public class RMSListener extends MIDlet{

  private RecordStore record = null;

  static final String REC_STORE = "LISTENER";



  public void startApp(){

  openRecord();

  record.addRecordListener(new RMSRecordListener());

  writeRecord("Core J2ME Technology");

  updateRecord("J2ME Wireless Toolkit");

  deleteRecord();

  closeRecord();

  deleteRecStore();

  }



  public void pauseApp(){}



  public void destroyApp(boolean unconditional){}  



  public void openRecord(){

  try{

  record = RecordStore.openRecordStore(REC_STORE, true);

  }catch (Exception e){}

  }

  

  public void writeRecord(String str){

  byte[] rec = str.getBytes();

  try{

  record.addRecord(rec, 0, rec.length);

  }catch (Exception e){}

  }



  public void updateRecord(String str){

  try{

  record.setRecord(1, str.getBytes(), 0, str.length());

  }catch (Exception e){}

  }



  public void deleteRecord(){

  try{

  record.deleteRecord(1);

  }catch (Exception e){}

  }



  public void closeRecord(){

  try{

  record.closeRecordStore();

  }catch (Exception e){}

  }



  public void deleteRecStore(){

  if (RecordStore.listRecordStores() != null){

  try{

  RecordStore.deleteRecordStore(REC_STORE);

  }catch (Exception e){}

  }  

  }

}



class RMSRecordListener implements RecordListener{

  public void recordAdded(RecordStore rs, int id) { 

  try{

  System.out.println("Record with id: " + id + " successfully

added to RecordStore: " + rs.getName()); }catch (Exception e){ System.err.println(e); } } public void recordDeleted(RecordStore rs, int id) { try{ System.out.println("Record with id: " + id + " successfully

deleted from RecordStore: " + rs.getName()); } catch (Exception e){ System.err.println(e); } } public void recordChanged(RecordStore rs, int id) { try{ System.out.println("Record with id: " + id + " successfully

update in RecordStore: " + rs.getName()); } catch (Exception e){ System.err.println(e); } } }