Android在分线程展示Toast

for (int i = 0; i < 100; i++) {    final int index = i;    new Thread(new Runnable() {        @Override        public void run() {            Looper.prepare();            if (toast == null) {                toast = Toast.makeText(MainActivity.this, String.valueOf(index), Toast.LENGTH_SHORT);            } else {                toast.setText(String.valueOf(index));            }            toast.show();            Looper.loop();        }    }).start();}