populate spinner with String array defined in xml

Question

I'm attempting to create the first page of an app that, after an element from the first spinner is selected, will display a second spinner and populate it with an array based on the selected element of the first spinner. I've found information regarding toArray() but I am in need of an explanation. Here is what is done so far.

package com.example.app;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;


public class MainActivity extends Activity implements OnItemSelectedListener{

Spinner state_dropdown, city_dc_dropdown, city_md_dropdown,     city_va_dropdown, city_ny_dropdown, category_dropdown;
Button search_button;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    state_dropdown = (Spinner)findViewById(R.id.state);
    city_dc_dropdown = (Spinner)findViewById(R.id.dc_city);
    city_md_dropdown = (Spinner)findViewById(R.id.city_md);
    city_va_dropdown = (Spinner)findViewById(R.id.city_va);
    category_dropdown = (Spinner)findViewById(R.id.category);
    search_button = (Button)findViewById(R.id.search);
    state_dropdown.setOnItemClickListener(this);
}


@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
    // TODO Auto-generated method stub
    String state_selected = String.valueOf(state_dropdown.getSelectedItem());
    Toast.makeText(this, state_selected, Toast.LENGTH_LONG).show();
    if(state_selected.contentEquals("DC")){
        List list = new ArrayList();

    }
}

@Override
public void onNothingSelected(AdapterView<?> parent) {
    // TODO Auto-generated method stub

}

I've stopped at List because I'm so confused.

What are the values of your spinners? At least the first one? — Kristy Welsh
– Kristy Welsh, Commented Oct 27, 2015 at 22:15

TooFast · Accepted Answer · 2015-10-27 23:42:51Z

3

First you have to load the array from xml and create an array list, in this way :

String[]  array_name= getResources().getStringArray(R.array.your_array);
ArrayList<String> namesList= new ArrayList<String>(Arrays.asList(array_name)));

and when you select the right item populate the spinner:

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.your_l, namesList);
yourSpinner.setAdapter(adapter);

answered Oct 27, 2015 at 23:42

TooFast

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Comments

Simeon · Accepted Answer · 2020-05-19 07:15:05Z

0

I feel like this is double work. You already have the array in arrays.xml. Why make it again as a list. That's more data to process and more stress for the pc. The best option would be to set the adapter to pick directly from arrays.xml and populate the spinner.

The array data is inserted during the create from resource method, and in the on click, all you have to do is assign the string value of whatever has been clicked on to a predefined string variable.

answered May 19, 2020 at 7:15

Simeon

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1 Comment

Jeremy Caney Over a year ago

Can you edit your answer to include a code sample? That would really round out this guidance.

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