How to display new Toast that overrides old Toast in no time in android

I have a an array of values displayed in the form of dialog in android, tap on any of the item, displays that particular toast. Now if I tap on other item on this list (array) in the very next moment, that particular toast displays after short duration(Approximately 5sec) till then old toast is displayed. If I wanted to display new Toast immediately after I select/tap other item on the list what can I do ?

So can someone tell me what is the logic to achieve this ?

For instance consider this code -

     String NumberOfItems[] = { "1", "2", "3" };
     Activity mActivity;
     int id =0;
     AlertDialog.Builder builder = new AlertDialog.Builder(mActivity);
     builder.setIcon(R.drawable.ic_launcher);
     builder.setTitle(R.string.dialog_heading);
     builder.setSingleChoiceItems(NumberOfItems, id, new DialogInterface.OnClickListener() 
      {
        public void onClick(DialogInterface dialog, int id)
         {

       switch(id)
         {
         case 0:
              Toast.makeText(mActivity.getBaseContext(),"Item selected is 1",Toast.LENGTH_SHORT).show();
                   break;
         case 1:
              Toast.makeText(mActivity.getBaseContext(),"Item selected is 2",Toast.LENGTH_SHORT).show();
                   break;
         case 2:
              Toast.makeText(mActivity.getBaseContext(),"Item selected is 3",Toast.LENGTH_SHORT).show();
                   break;

                } 

          }
        });  
            AlertDialog alertDialog =  builder.create();
            alertDialog.show(); 

Now Dialog containing 3 items displays, tap on 1st item displays "Item selected is 1" soon I tap on next item but it displays "Item selected is 2" after ~5sec. But if I wanted to display immediately on tap of 2nd item what can I do ?

In short what is the logic to refresh Toast ?

Any help is greatly appreciated.