Thanks for your reply, and sorry for my late answer. :-)
I tried to get it running as a service but I don't really get how I
have to use services, binders and service connections. I'm reading a
book with an example for services but can't adopt it to my problem.
What I tried is the following:
I created one class for the service, which holds the variable for my
database:
__________________
public class DatabaseService extends Service {
public DbAdapter mDbAdapter;
private DatabaseBinder mDatabaseBinder = new DatabaseBinder();
@Override
public IBinder onBind(Intent intent) {
return mDatabaseBinder;
}
@Override
public void onCreate() {
super.onCreate();
mDatabaseBinder.mDatabaseService = this;
mDbAdapter = new DbAdapter(getApplicationContext());
mDbAdapter.open();
}
@Override
public void onDestroy() {
super.onDestroy();
mDatabaseBinder.mDatabaseService = null;
mDbAdapter.close();
}
}
This is my database binder:
__________________
public class DatabaseBinder extends Binder {
public DatabaseService mDatabaseService;
public DbAdapter getDbAdapter() {
return mDatabaseService.mDbAdapter;
}
}
And this my service connection:
__________________
public class DbServiceConnection implements ServiceConnection {
DatabaseBinder mBinder;
public DbServiceConnection(DatabaseBinder binder) {
mBinder = binder;
}
@Override
public void onServiceConnected(ComponentName className, IBinder
binder) {
mBinder = (DatabaseBinder) binder;
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
}
}
If I want to use this in my activity with this:
private DatabaseBinder mDatabaseBinder;
private DbServiceConnection mServiceConnection = new
DbServiceConnection(mDatabaseBinder);
final Intent databaseServiceIntent = new Intent(this,
DatabaseService.class);
this.bindService(databaseServiceIntent, mServiceConnection,
Context.BIND_AUTO_CREATE);
mDb = mDatabaseBinder.getDbAdapter();
I'm getting a nullpointer exception at the last line. I don't know if
I'm using it right (I guess not :D ), I haven't used services before.
Do you know why it is throwing a Nullpointer exception? Is this the
right way to use a service and bind it in the activity or should I do
it somehow different?
On 19 Jul., 00:30, brucko <[email protected]> wrote:
> Bender,
>
> put your db in a local Service. Open the db in onCreate() close it in
> onDestroy(). Your Activities can bind and unbind to the Service as
> many times as you like. The system will keep the service running as
> long as you have an activity in the foreground process bound to it or
> otherwise until it needs to reclaim the resources.
>
> Take a look at :
>
> http://developer.android.com/resources/samples/ApiDemos/src/com/examp...
>
> but DONT have your binder as a non-static inner class as in the
> example - or you will create a memory leak and leak your Service.
> Instead, pass the binder a reference to your service in onCreate and
> get the binder to null the reference out in onDestroy
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