public void showSettingsBox(){
  final CharSequence[] items = {"Item1","Item2","Item3"};
  final boolean checked[] = new boolean[]{false,false,false};

  AlertDialog.Builder builder = new AlertDialog.Builder(fLabyrinthGame); 
  builder.setMessage(fMessage)
   .setCancelable(false)
   .setMultiChoiceItems(items,checked,new OnMultiChoiceClickListener() {

    @Override
    public void onClick(DialogInterface dialog,int which,boolean isChecked) {
     CharSequence text = "Item number " + which;
     int duration = Toast.LENGTH_SHORT;

     Toast toast = Toast.makeText(fLabyrinthGame,text,duration);
     toast.show();

    }
   })
   .setPositiveButton("Apply",new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog,int id) {
     dialog.cancel();
    }
   });
  builder.setTitle(fTitle); 
  builder.setIcon(R.drawable.icon_exclamation); 

  AlertDialog alert = builder.create(); 

  alert.show();   
 }

不显示三个项目和复选框,标题栏和应用按钮之间只有一条白线.有谁知道为什么这不起作用？