如何在微调器的第一个位置设置默认值？

Question

下面是我的代码，我从中通过 sqlite 在微调器中填充状态，它运行完美。现在我想要在第一个位置添加硬编码的 "Select State" 。我怎样才能做到这一点？

 try {
            ArrayList<String> state_array = new ArrayList<String>();

            Cursor cursor = db.rawQuery("SELECT nSerialNo as _id,cCodeName FROM CodeMaster where nCtgId = 6", null);


            if (cursor.moveToFirst()) {
                do {
                    //assing values
                    String stateID = cursor.getString(0);
                    String stateName = cursor.getString(1);
                    stateData = stateName;
                    state_array.add(stateData);


                } while (cursor.moveToNext());
            }

            ArrayAdapter my_Adapter = new ArrayAdapter(getActivity(), android.R.layout.simple_list_item_1, state_array);
            spnState.setAdapter(my_Adapter);
            cursor.close();
            spnState.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                @Override
                public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

                    state = spnState.getSelectedItem().toString();

                    Cursor cursor = db.rawQuery("SELECT nSerialNo FROM CodeMaster where cCodeName = '" + state + "'", null);

                    if (cursor.moveToFirst()) {
                        do {
                            //assing values
                            stateCodeId = cursor.getString(0);

                        } while (cursor.moveToNext());
                    }
                    cursor.close();

                }

                @Override
                public void onNothingSelected(AdapterView<?> parent) {

                }


            });
        } catch (Exception e) {

            e.printStackTrace();

        }

Answer 1

试试这个代码。

try {
            ArrayList<String> state_array = new ArrayList<String>();
           state_array.add("Select State");

            Cursor cursor = db.rawQuery("SELECT nSerialNo as _id,cCodeName FROM CodeMaster where nCtgId = 6", null);


            if (cursor.moveToFirst()) {
                do {
                    //assing values
                    String stateID = cursor.getString(0);
                    String stateName = cursor.getString(1);
                    stateData = stateName;
                    state_array.add(stateData);


                } while (cursor.moveToNext());
            }

Answer 2

state_array.add(0, "Select State"); ArrayAdapter my_Adapter = new ArrayAdapter(getActivity(), android.R.layout.simple_list_item_1, state_array); spnState.setAdapter(my_Adapter); cursor.close();

如何在微调器的第一个位置设置默认值？

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