Question

I try to attach a on select event to my Android android.widget.Spinner

I know Spinner.setOnItemSelectedListener exist but not work as I want,
The problem with the setOnItemSelectedListener is that method is call while the spinner is load with a Adapter and as predefine a item is select.

I want a interface for get a event while a “user” select a item from the Spinner by use the tuch screen. Also a event that only is call while the use select a item and not the program select a item.

I want a event that is call while the use select a item from this spinner dialog.

Answer 1

I have finally find a solution that works for me, by look at the code on http://www.oschina.net/code/explore/android-4.0.1/core/java/android/widget/Spinner.java

I found out how to prevent or attach more code to this code part that is run while the use will show the dropdown list and then create my one instace of Spinner.

My spinner class has a use define interface OnSelectSpinnerListener that will be run while the user tuch the spinner and then select a item from the spinner list.

/**
 * Create a DropDown Spinner/Select List, that also has some event for detect
 * action do by the use and action do by the system.
 *
 * Use {@link OnSelectSpinnerListener} for attach a listener to this
 * SelectSpinner.
 */
public class SelectSpinner extends Spinner {

    public interface OnSelectSpinnerListener {

        /**
         * Call before the drop down menu is show that allow use to select one
         * of the item from the Spinner.
         */
        public void onOpenSelectMenu();

        /**
         * Call while the use press a button or item for select this. This will
         * not be call while the system set a select value for the spinner. Use {@link SelectSpinner#setOnItemSelectedListener(android.widget.AdapterView.OnItemSelectedListener)}
         * for get all event while a item is set to the spinner.
         *
         * @param index Select item as Index
         * @param object Select item as Object
         */
        public void onItemSelectByUser(int index, Object object);
    }
    private OnSelectSpinnerListener onSelectSpinnerListener;

    public SelectSpinner(Context context) {
        super(context);

    }

    public SelectSpinner(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public SelectSpinner(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public OnSelectSpinnerListener getOnSelectSpinnerListener() {
        return onSelectSpinnerListener;
    }

    public void setOnSelectSpinnerListener(OnSelectSpinnerListener onSelectSpinnerListener) {
        this.onSelectSpinnerListener = onSelectSpinnerListener;
    }

    @Override
    public void onClick(DialogInterface dialog, int which) {
        super.onClick(dialog, which);
        if (this.onSelectSpinnerListener != null) {
            Object item = super.getItemAtPosition(which);
            this.onSelectSpinnerListener.onItemSelectByUser(which, item);
        }
    }

    @Override
    public boolean performClick() {
        if (this.onSelectSpinnerListener != null) {
            this.onSelectSpinnerListener.onOpenSelectMenu();
        }
        return super.performClick();
    }
}