Using persistence to display number of times visits for a BB Application? - blackberry

Question

I have developed an application. I want to display a message before the user starts implementing my application. Like when it is used first time i want to show "Count = 1". And when app is visited second time, "Count = 2".
How can i achieve it? I had done such thing in android using sharedperferences. But how can i do it in blackberry. I had tried something with PersistentStore. But cant achieve that, for i dont know anything about the Persistance in BB.
Also i would wish to restrict the use for 100. Is it possible?
sample codes for this will be appreciable, since i am new to this environment..

Answer 1

You can achieve it with Persistent Storage.
Check this nice tutorial about storing persistent data.
Also you can use SQLite. Link to a development guide which describes how to use SQLite databases in Java® applications: Storing data in SQLite databases.
You can restrict user for trying your application at most 100 times using your own logic with the help of persistent data. But I think there may be some convention, so try Google for that.

Answer 2

got it...
I created a new class which implements Persistable. In that class i had created an integer variable and set an getter and setter function for that integer...
import net.rim.device.api.util.Persistable;
public class Persist implements Persistable
{
private int first;
public int getCount()
{
return first;
}
public void setCount()
{
this.first += 1;
}
}
Then in the class which initializes my screen, i had declared persistence variables and 3 functions to use my Persist.java, initStore(), savePersist(), and getPersist()
public final class MyScreen extends MainScreen implements FieldChangeListener
{
/*
* Declaring my variables...
*/
private static PersistentObject store;
public Persist p;
public MyScreen()
{
//my application codes
//here uses persistence
initStore();
p = getPersist();
if(p.getCount()<100)
{
savePersist();
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
Dialog.alert(p.getCount.toString());
}
});
}
else
{
close();
System.exit(0);
}
}
//three function....
public static void initStore()
{
store = PersistentStore.getPersistentObject(0x4612d496ef1ecce8L);
}
public void savePersist()
{
synchronized (store)
{
p.setCount();
store.setContents(p);
store.commit();
}
}
public Persist getPersist()
{
Persist p = new Persist();
synchronized(store)
{
p = (Persist)store.getContents();
if(p==null)
{
p = new Persist();
}
}
return p;
}
}
I hope u all will get it right now....
If there are another simple way, plz let me know...
Thanks