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);   }   }  }

 

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