back button

gistfile1.txt

@Override
public void onBackPressed() 
{
	new AlertDialog.Builder(this)
	.setIcon(android.R.drawable.ic_dialog_alert)
	.setTitle("Exit")
	.setMessage("Are you sure you want to quit?")
	.setPositiveButton("Yes", new DialogInterface.OnClickListener()
	{
		@Override
		public void onClick(DialogInterface dialog, int which) 
		{
			finish();    
		}

	})
	.setNegativeButton("No", null)
	.show();
}