how should I open and close my database properly

Question

I have an app which stores some data in a SQLite DB.Also I\'m doing a lot of query an requery in my app.I have about 15 activities in it.And almoust all use the DB to query for

Answer 1

In my app I open connection to database in myApplication class (your custom class that extends Application - it should be named the same as your application in androidManifest).

AndroidManifest.xml

MyApplication .java

public class MyApplication extends Application {

    private DatabaseAdapter dbAdapter;


    @Override
    public void onCreate() {
        dbAdapter = new DatabaseAdapter(getApplicationContext());
        dbAdapter.open();
    }

And in each class that need db connection I simply use:

MyApplication myApplication = (MyApplication) this.getApplication();
DatabaseAdapter dbAdapter= myApplication.getDatabaseAdapter();

MyApplication is run automatically on every application start. This way I keep only one connection to DB so it's closed when app is being removed from memory without any problem.