用房间数据库填充微调器

Question

I am making my first app. (with lots of google and tutorials).

I made a Room Database with the following table.

Now I want to fill a Spinner with the Strings of the column "team_name".

On Spinner Selection the "team_url" should be put in a variable.

Cant find out how.

Thanks for helping.

Greetings!

Update:

    Spinner league = findViewById(R.id.league);
    tableDAO = TeamDatabase.getInstance(this).getTableDAO();

    List<Team> allTable = tableDAO.getTable();

    ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, new ArrayList<String>());
    spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    league.setAdapter(spinnerAdapter);

    spinnerAdapter.addAll(allTable);
    spinnerAdapter.notifyDataSetChanged();

Answer 1

I assume you are using Java and have some code similar to this to initialize the Spinner .

Spinner spinner = (Spinner)findViewById(R.id.mySpinner);
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, new ArrayList<>());  
spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(spinnerAdapter);

what you need to do is fetch the data from DB using Room and add them to the adapter

spinnerAdapter.addAll(yourList);
spinnerAdapter.notifyDataSetChanged();

and once the user clicks any items, you can use the callback function to get the team name and use Room to fetch the corresponding team_url.

The Dao of your Room may look like this

@Dao
public interface TeamDao {
    @Query("SELECT * FROM team")
    List<Team> getAll();

    @Query("SELECT team_name FROM team")
    List<String> getAllTeamName();

    @Query("SELECT team_url FROM team WHERE team_name = :name")
    public abstract List<String> findURLByName(String name);

}