Question

我正在尝试创建一个空选择的微调器，但问题是我从SQLite DataBase加载我的微调器。这是我用来加载微调器的代码：

 public void loadSpinnerDataRegion() {
       DataBaseHelper myDbHelper = new DataBaseHelper(this);
        myDbHelper = new DataBaseHelper(this);

            try {

                myDbHelper.createDataBase();

            } catch (IOException ioe) {

                throw new Error("Unable to create database");

            }

            try {

                myDbHelper.openDataBase();


            }catch(SQLException sqle){

                throw sqle;

            } 

            // Spinner Drop down elements

            RegionList=myDbHelper.getAllRegion();
             // Creating adapter for spinner
             ArrayAdapter<String>dataAdapter = new ArrayAdapter<String>(this,
                        android.R.layout.simple_spinner_item,RegionList);
              // Drop down layout style - list view with radio button
                  dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

                // attaching data adapter to spinner
                spinner2.setAdapter(dataAdapter); 
                }

Answer 1

试试这个

RegionList.add("");
ArrayList<String> list= myDbHelper.getAllRegion();
RegionList.addAll(list);

 ArrayAdapter<String>dataAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,RegionList);

Answer 2

使微调器空调dataAdapter.clear();

然后在需要时再次填写;像这样：

dataAdapter.addAll(RegionList);

或者你可以对整个数组进行迭代，并单独添加每个元素，如下所示：

for (Object object: RegionList) {
            dataAdapter.add(object.getData());
        }

希望这是有用的答案

Answer 3

我修好了它： RegionList = myDbHelper.getAllRegion（）; RegionList.add（0，“”）; //为微调器创建适配器 ArrayAdapterdataAdapter = new ArrayAdapter（这个， android.R.layout.simple_spinner_item，RegionList）; 谢谢大家!!

Spite从SQLite DataBase填充，空选择

3 个答案: