Android spinner highlight selected item

Question

I've got basic android spinner and I would like to have, after clicking it, the list with items with one of them highlighted, the one, that was originally selected.

Like it's done here: http://www.warriorpoint.com/blog/wp-content/uploads/2009/05/05spinner-thumb.png

But with my own layout of the items and not with the radio box, but with my own background instead.

How can I achieve this? Is there anything of use in the selector, or do I have to do it programatically?

Any help is appreciated.

Answer 1

Below is an solution I tested and verified. You can use setSelection(N) to highlight the item you want.

class HighLightArrayAdapter extends ArrayAdapter<CharSequence> {

        private int mSelectedIndex = -1;


        public void setSelection(int position) {
            mSelectedIndex =  position;
            notifyDataSetChanged();
        }

        public HighLightArrayAdapter(Context context, int resource, CharSequence[] objects) {
            super(context, resource, objects);
        }


        @Override
        public View getDropDownView(int position, View convertView, ViewGroup parent) {
            View itemView =  super.getDropDownView(position, convertView, parent);

            if (position == mSelectedIndex) {
                itemView.setBackgroundColor(Color.rgb(56,184,226));
            } else {
                itemView.setBackgroundColor(Color.TRANSPARENT);
            }

            return itemView;
        }
    }

Answer 2

public class MainActivity extends Activity {

Spinner mySpinner;
String[] myArray={"1","2","3","4","5"};
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    mySpinner = (Spinner)findViewById(R.id.spinner_test);

    mySpinner.setAdapter(new MyAdapter(this,android.R.layout.simple_spinner_item, myArray));

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

public class MyAdapter extends ArrayAdapter<String>{

    public MyAdapter(Context context, int textViewResourceId,
            String[] objects) {
        super(context, textViewResourceId, objects);
        // TODO Auto-generated constructor stub
    }

    @Override
    public View getDropDownView(int position, View cnvtView, ViewGroup prnt){
        LayoutInflater inflater = getLayoutInflater();
        View spinnerItem = inflater.inflate(android.R.layout.simple_spinner_item, null);

        TextView mytext= (TextView)spinnerItem.findViewById(android.R.id.text1);
        mytext.setText(myArray[position]);

        //int selected = Spinner.
        int selected = mySpinner.getSelectedItemPosition();
        if(position == selected){
            spinnerItem.setBackgroundColor(Color.BLUE);
        }
        return spinnerItem;

    }

}

}

This should help.