How do I load the application as user id?

Question

In my app you have a user registration. Each user has a name and email, I would like when you start the application to save the default user id (or reload the application when I change the user) because I would fetch the information from the database according to the key id_usuario and list from that attribute. An example:

And on the other screens too, I would like to save this user and use on the screens I have of expense/revenue listing and expense/revenue insertion?

I was warned about a certain Singleton, I would like to see if it is possible to use it too.

Answer 1

Face if you are saving the user in a table. when you start the app grab your user from the table, and put them in the Application. So from any screen you can access your user.

Follow the example

in the manifest

<application
        android:name="pacote.MyApplication"

Application class

public class MyApplication extends Application {
private User user;
...gets sets

its main Actv

public class MainActivity extends Activity {

private MyApplication application;
private User user;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

application = (MyApplication) this.getApplicationContext();

user = //pego o user em seu db sqlite
application.setUser(user); // set o user no seu application
//agora pode usar o objeto que e esta no Apllication
// Ex: application.getUser().getNome;

using in another Actv

public class OutraActivity extends Activity {
private MyApplication application;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_outra_tela);

application = (MyApplication) this.getApplicationContext();
//use o objeto do Application
application.getUser().getNome;

hope to have helped in your knowledge...and in your app...

Valew