Android: spinner setSelection doesn't work

Question

I can't solve the problem with my spinner setSelection() method. I'm writing a program to save data, which I have from some kind of a table, in the DB. When the user opens a program it loads data from the DB and adds 3 empty "table" rows so the user can fill them and save them. When data from the DB is loaded, I need to set the selections of spinners correctly, but when I'm trying my code it just doesn't work and all the spinners on the screen appear with the 0 items selected. Here is my code.
OnCreate() method:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.data);
    
    dbHelper = new DBHelper(this);
    content = (LinearLayout) findViewById(R.id.content);
    inflater = getLayoutInflater();
    
    Calendar c = Calendar.getInstance(); 
    cur_year = c.get(Calendar.YEAR);
    cur_month = c.get(Calendar.MONTH);
    cur_day = c.get(Calendar.DAY_OF_MONTH);
    
    load_array();
    load_database();

    for (int i = 0; i < EMPTY_LINES_TO_DRAW; i++) {
        draw();
    }
}

load_array() is a function that load array "suppliers" (from file) which i then put in my spinner adapter.
load_database() function:

private void load_database() {
    SQLiteDatabase db = dbHelper.getWritableDatabase();
    Cursor c = db.query("mytable", null, null, null, null, null, null);
    
    if (c.moveToFirst()) {

        int date_1_Index = c.getColumnIndex("date_1");
        int key_Index = c.getColumnIndex("key_field");
        int supp_Index = c.getColumnIndex("supplier");
        int sum_Index = c.getColumnIndex("summ_field");
        int check_Index = c.getColumnIndex("check_field");
        int date_2_Index = c.getColumnIndex("date_2");

        do {
          draw(c.getString(date_1_Index), c.getString(key_Index), c.getString(supp_Index), c.getInt(sum_Index), c.getInt(check_Index), c.getString(date_2_Index));
        } while (c.moveToNext());
      }
      c.close();
}

draw() function:

public void draw(String date_1_string, String key_string, String supp_string, Integer sum_int, Integer check_int, String date_2_string) {
    View item = inflater.inflate(R.layout.ll_item, content, false);
    
    for (int i = 0; i < 6; i++) {
        delta_id[i] = generateViewId();
    }
    id.add(delta_id.clone());
    
    Button date_1 = (Button) item.findViewById(R.id.date_1);
    date_1.setText(date_1_string);
    date_1.setOnClickListener(this);
    date_1.setId(delta_id[0]);
    
    EditText key = (EditText) item.findViewById(R.id.key);
    key.setText(key_string);
    key.setId(delta_id[1]);
    
    Spinner spin = (Spinner) item.findViewById(R.id.spin);
    adapter_supp =  new ArrayAdapter<String>(this, R.layout.spinner, suppliers);
    spin.setAdapter(adapter_supp);
    spin.setPrompt("Поставщик:");
    Log.d("my_log", "supp_string = " + supp_string);
    spin.setSelection(Arrays.asList(suppliers).indexOf(supp_string));
    Log.d("my_log", "Index of the supp_string = " + Arrays.asList(suppliers).indexOf(supp_string));
    adapter_supp.notifyDataSetChanged();
    spin.setId(delta_id[2]);
    
    EditText sum = (EditText) item.findViewById(R.id.sum);
    sum.setText(sum_int.toString());
    sum.setId(delta_id[3]);
    
    CheckBox check = (CheckBox) item.findViewById(R.id.check);
    if (check_int == 1) {
        check.setChecked(true);
    } else if (check_int == 0){
        check.setChecked(false);
    }
    check.setId(delta_id[4]);
    
    Button date_2 = (Button) item.findViewById(R.id.date_2);
    date_2.setText(date_2_string);
    date_2.setOnClickListener(this);
    date_2.setId(delta_id[5]);
    
    content.addView(item);
}

The weird thing is that when I go to the second activity, then return to the first, I got my selections set correctly as it was. But when I close the program, then open it again, all the spinners are set to default item with index 0. Here is my onResume() code:

@Override
public void onResume() {
    super.onResume();
    
    load_array();
    
    // Верхний, главный, фильтр.
    
    adapter_supp = new ArrayAdapter<String>(this, R.layout.spinner, suppliers);
    adapter_supp.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    Spinner filter_supp = (Spinner) findViewById(R.id.filter_supp);
    filter_supp.setAdapter(adapter_supp);
    filter_supp.setPrompt("Фильтр по поставщику:");
    
    // Обновить спиннеры поставщиков. Update spinners.
    
    for (int i = 0; i < id.size(); i++) {
        Integer[] item = id.get(i);
        Spinner supp = (Spinner) findViewById(item[2]);
        supp.setAdapter(adapter_supp);
        if (pause_cash_string != null) {
        supp.setSelection(Arrays.asList(suppliers).indexOf(pause_cash_string[i]));
        adapter_supp.notifyDataSetChanged();
        }
    }
}

Yes, Arrays.asList(suppliers).indexOf() in both places (in onResume() and draw() functions) returns correct index, I have checked it few times.

Answer 1

I have same problem. the solution is posting setSelection() method:

mSpinner.post(new Runnable() {        
    public void run() {
      mSpinner.setSelection(1);
    }
  });

also in some cases calling setSelection(position, animation) instead of setSelection(position) solves the problem:

setSelection(1, false);

but I recommend the first code.

hope helpful.

Answer 2

I've resorted to storing the value of the position in an int (spinnerSelection) and when it hits onItemSelected (which it will when you call .setSelection() ) I set it again. It's a hack but it works for me now.

public void onItemSelected(AdapterView<?> parent, View view,
                           int pos, long id) {
    if(spinnerFixer >=2){ //it hits this twice before any user input for some reason (init + setSelection both trigger).
      //stuff
    } else { spinnerFixer++;
        if(spinnerSelection != 0){
        spinner.setSelection(spinnerSelection,true); spinnerSelection=0; }
    }

Answer 3

After setting values to adapter, call setSelection()

ArrayAdapter<String> adapter = new ArrayAdapter<String>
                (this, android.R.layout.simple_spinner_item,
                        spinnerArray);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);
//setSelection
spinner.setSelection(1);

Answer 4

Call adapter_supp.notifyDataSetChanged(); before (not after) you try to set the selected item with supp.setSelection()