In the below  code I have created a spinner, when you add your name or text in edit text box and press Add Button your text data will be save on Spinner. Here first I have added a EditText, Button and Spinner with in activity_main.xml layout. In next step I have created a new spinner _item layout here I have added a TextView.  After this in Programming area , Here I have created a Databasehelper class and extended with SQLiteOpenHelper . In forth step i have created SQLController class here I have used insertData method , In MainActivity I have used loadtospinner() and OnClickListener() method, In MainActivity  I have created a MyAsync private  class and this class is extended with AsynTask. You can see below example code it clearly describe you "How to save Data items in spinner “.

Step(1)-actvity_main.xml layout-
 

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:padding="30dp" >

    <EditText
        android:id="@+id/et_id"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/addbtn_id"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:text="Add Member" />

    <Spinner
        android:id="@+id/spinner_id"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

Step(2)-Created a spinner_item layout-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:textColor="#000000"
        android:textSize="20dp" />

</LinearLayout>

Step(3)- I have created DatabaseHelper class-

public class DatabaseHelper extends SQLiteOpenHelper {

    // TABLE INFORMATTION
    public static final String TABLE_MEMBER = "member";
    public static final String MEMBER_ID = "_id";
    public static final String MEMBER_NAME = "name";

    // DATABASE INFORMATION
    static final String DB_NAME = "MEMBER.DB";
    static final int DB_VERSION = 1;

    // TABLE CREATION STATEMENT
    private static final String CREATE_TABLE = "create table " + TABLE_MEMBER
            + "(" + MEMBER_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
            + MEMBER_NAME + " TEXT NOT NULL);";

    public DatabaseHelper(Context context) {
        super(context, DB_NAME, null, DB_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_TABLE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        db.execSQL("DROP TABLE IF EXISTS " + TABLE_MEMBER);
        onCreate(db);
    }
}

Step(4)-I have created a new SQLController class -

public class SQLController {
    private DatabaseHelper dbhelper;
    private Context ourcontext;
    private SQLiteDatabase database;

    public SQLController(Context c) {
        ourcontext = c;
    }

    public SQLController open() throws SQLException {
        dbhelper = new DatabaseHelper(ourcontext);
        database = dbhelper.getWritableDatabase();
        return this;

    }

    public void close() {
        dbhelper.close();
    }

    public void insertData(String name) {

        ContentValues cv = new ContentValues();
        cv.put(DatabaseHelper.MEMBER_NAME, name);
        database.insert(DatabaseHelper.TABLE_MEMBER, null, cv);
    }


    public Cursor readData() {
        String[] allColumns = new String[] { DatabaseHelper.MEMBER_ID, DatabaseHelper.MEMBER_NAME };
        Cursor c = database.query(DatabaseHelper.TABLE_MEMBER, allColumns, null, null, null, null, null);
        if (c != null) {
            c.moveToFirst();
        }
        return c;
    }

}

Step(5)-MainActivity-
 

public class MainActivity extends AppCompatActivity {


        Button AddBtn;
        EditText et;
        Spinner spn;

        SQLController SQLcon;
        ProgressDialog PD;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            AddBtn = (Button) findViewById(R.id.addbtn_id);
            et = (EditText) findViewById(R.id.et_id);
            spn = (Spinner) findViewById(R.id.spinner_id);

            SQLcon = new SQLController(this);
            // opening database
            SQLcon.open();

            loadtospinner();

            AddBtn.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {

                    new MyAsync().execute();

                }
            });
        }


        public void loadtospinner() {

            Cursor c = SQLcon.readData();
            final ArrayList<String> al = new ArrayList<String>();

            c.moveToFirst();
            while (!c.isAfterLast()) {

                String name = c.getString(c.getColumnIndex(DatabaseHelper.MEMBER_NAME));
                al.add(name);
                c.moveToNext();
            }

            ArrayAdapter<String> aa1 = new ArrayAdapter<String>(
                    getApplicationContext(), R.layout.spinner_item, R.id.textView1,
                    al);

            spn.setAdapter(aa1);


            // closing database
            SQLcon.close();

        }

        private class MyAsync extends AsyncTask<Void, Void, Void> {

            @Override
            protected void onPreExecute() {

                super.onPreExecute();
                PD = new ProgressDialog(MainActivity.this);
                PD.setTitle("Please Wait..");
                PD.setMessage("Loading...");
                PD.setCancelable(false);
                PD.show();
            }

            @Override
            protected Void doInBackground(Void... params) {
                String name = et.getText().toString();
                // opening database
                SQLcon.open();
                // insert data into table
                SQLcon.insertData(name);


                return null;
            }

            @Override
            protected void onPostExecute(Void result) {
                super.onPostExecute(result);
                loadtospinner();
                PD.dismiss();
            }


        }

    }