如何在微调器中设置ID和值

Question

I created a Data-Base table student which contains two fields like student_id and student_name. This table contains some data for student.

My actual problem is I want to set ID and name of student in spinner like in html select tag, so when select spinner item I must get this ID to get another data from database.

Answer 1

You can have two arraylist for name and id;

List<String> sIds = new ArrayList<String>();//add ids in this list
List<String> names = new ArrayList<String>();//add names in this list

Then you can retrive here inside spinner select. It will work even if two names are same in the spinner which may be the case:

  spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
            int id = sIds.get(position);//This will be the student id.
        }

        @Override
        public void onNothingSelected(AdapterView<?> parentView) {
            // your code here
        }

    });

Answer 2

Assuming I am reading your list correctly, if you want to set an Id to your Spinner programically just use..

mSpinner.setId(int)

In this code replace mSpinner with the reference to your Spinner and int with the desired Id

Answer 3

To add values into Spinner you can do it something like this Test

 public class Test extends Activity 
{


 ArrayList<String> InfoStudent = new ArrayList<String>();
 ArrayList<String> IdStudent = new ArrayList<String>();


    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

  Spinner spinner = (Spinner) findViewById(R.id.spinner1); 


   //Here you'll have to make a query to get ID and Name then with 
  InfoStudent.add("TheID" + "InfoStudentReturnedByQuery");
  //TheID should go in IdStudent ArrayAdapter and InfoStudentReturnedByQuery should go in InfoStudent ArrayAdapter

  // Then you create the arrayAdapter
  ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(Test.this
            ,android.R.layout.simple_spinner_item,difficultyLevelList);

                 // Set the Adapter
  spinner.setAdapter(arrayAdapter);

If you want to know what spinner is selected you should do something like this :

          spinner.setOnItemSelectedListener(new  AdapterView.OnItemSelectedListener() { 

              public void onItemSelected(AdapterView<?> adapterView, 
             View view, int i, long l) { 
             // TODO Auto-generated method stub
          Toast.makeText(MainActivity.this,"You Selected : "
           + TheMainAdapterOfStudents.get(i)+" Student ",Toast.LENGTH_SHORT).show();

               }

This only it's a guide how to, hope it helps :)

Answer 4

1. Declare type Like:

public class Item
{
public long id;
public String name;
}

2. Fill spinner with data (Item[]):

ArrayAdapter<DictionaryEntity> dataAdapter = new ArrayAdapter<DictionaryEntity>this,android.R.layout.simple_spinner_item, data);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(dataAdapter);

3. Get your id where you need it:

Item item = (Item)spinner.getSelectedItem();
return item.id;