Clear Spinner on Button press
===

Can anyone suggest how to clear the values in the spinner on a button click?

    Spinner spinner1;
	private static final String[] SpinArray= { "00", "01", "02",
			"03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "13",
			"14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "00" };


	adapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item,
				SpinArray);
		adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
		spinner1.setAdapter(adapter);
		
		spinner1.setOnItemSelectedListener(new mySpinnerListener());

    public void onItemSelected(AdapterView parent, View v, int position,  
                long id) {
			// TODO Auto-generated method stub
			switch(parent.getId()){
	        case R.id.spinner1:
	        	spinner1=parent.getSelectedItem().toString();
	            break;
	       
		}


on button click i tried to clear using

    spinner1.setAdapter(null); and spinner1.setOnItemSelectedListener(null);

both of these didn't work in my case.. please help