Android：微调器 setSelection 不起作用

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

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

Answer 3

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 4

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);