Removing the last item from spinner deletes the entire list

Question

I am trying to use a spinner control that will allow the user to remove any list item. I have an add button to add items to the list, and a delete button that removes the currently displayed item from the list.

It works as expected except when the user deletes the last item in the list. At this point, all items in the list are deleted.

My code is as follows:

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

    // grab our UI elements so we can manipulate them (for the Spinner)
    // or add listeners to them (in the case of the buttons)
    m_myDynamicSpinner = (Spinner)findViewById(R.id.dynamicSpinner);
    m_addItemText = (EditText)findViewById(R.id.newSpinnerItemText);
    Button addButton = (Button)findViewById(R.id.AddBtn);
    Button clearButton = (Button)findViewById(R.id.ClearBtn);

    // create an arrayAdapter an assign it to the spinner
    m_adapterForSpinner = new ArrayAdapter(this, android.R.layout.simple_spinner_item);
        ((ArrayAdapter)m_adapterForSpinner).setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    m_myDynamicSpinner.setAdapter(m_adapterForSpinner);

    // add listener for addButton
    addButton.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            addNewSpinnerItem();
        }
    });

    clearButton.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            clearSpinnerItems();
        }
    });
}

// add listener for addButton
private void addNewSpinnerItem() {
    if (m_addItemText.getText().length() == 0) {
        Toast.makeText(getApplicationContext(), "The textView is empty", Toast.LENGTH_LONG).show();
    } else {
        CharSequence textHolder = "" + m_addItemText.getText();
        ((ArrayAdapter) m_adapterForSpinner).add(textHolder);
    }
    m_addItemText.setText("");
}

private void clearSpinnerItems() {
    m_myDynamicSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
            Object t = m_adapterForSpinner.getItem(pos);
            ((ArrayAdapter) m_adapterForSpinner).remove((CharSequence) t);
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO
        }
    });
}

Does anyone have any ideas or suggestions on how to do this?

Answer 1

, onItemSelected, , , , . :

Log.d("Spinner", "Count: " + m_adapterForSpinner.getCount());

, . , , - , . . :

public class SpinnerTest extends Activity {
    Spinner m_myDynamicSpinner;
    EditText m_addItemText;
    ArrayAdapter m_adapterForSpinner;

    public static boolean cleared = false;  //   <--- set up a static boolean here

       @Override
        public void onCreate(Bundle savedInstanceState) {
// all your code unchanged

        clearButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {

                cleared=false;   //   <--- nope, we did not clear the value yet

                clearSpinnerItems();
            }
        });
    }

// code unchanged

    private void clearSpinnerItems() {
        m_myDynamicSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {

            public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
                Object t = m_adapterForSpinner.getItem(pos);
                Log.d("Spinner", "Count: " + m_adapterForSpinner.getCount());

                if (!cleared)  //   <--- did I do it already?

                    ((ArrayAdapter) m_adapterForSpinner).remove((CharSequence) t);

                Log.d("Spinner", "Count: " + m_adapterForSpinner.getCount());

                cleared=true;  // I did it!

            }

// code unchanged

Answer 2

. getSelectedItemPosition().