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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