Question

I have a button and a spinner (originally hidden). When user presses a button, spinner gets populated with items and becomes visible. Now I would like to add OnItemSelectedListener to the spinner. and I have tried many tutorials with no luck.

This is my OnCreate function

public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Button load_routes = (Button)findViewById(R.id.load_routes);
    Spinner routes = (Spinner)findViewById(R.id.routes_list);

    load_routes.setOnClickListener(new View.OnClickListener()
    {
        public void onClick(View v)
        {
            load_routes(v);
        }
    });

    routes.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
    {
        public void onItemSelected(AdapterView<?> arg0, View v, int position, long id)
        {
            Log.v("routes", "route selected");
        }

        public void onNothingSelected(AdapterView<?> arg0)
        {
            Log.v("routes", "nothing selected");
        }
    });
}

This is my load_routes function

private void load_routes(View v)
{
    Spinner routes = (Spinner)findViewById(R.id.routes_list);
    List<String> routes_list = RouteParser.get_routes();
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, routes_list);
    routes.setAdapter(adapter);

    TableRow list_of_routes_row = (TableRow)findViewById(R.id.list_of_routes_row);
    list_of_routes_row.setVisibility(View.VISIBLE);
}

This set up does not work. The only way I got this to work is when I setup my listener as routes.setOnItemSelectedListener(this) Then I implement OnItemSelectedListener and include the functions neccessary. But I have multiple spinners and need to create separate listeners for different spinner. Any help will be appreciated. Thanks!

Answer 1

Declare your Spinner as field instantiate the listener once you do findViewById and use it wherever you want.