数据为空时点击 报错 看代码 case R.id.route_1: checkRoutePlanItemsValidity(mRoutePlanItems); mLayoutTab0.setSelected(false); mLayoutTab1.setSelected(true); mLayoutTab2.setSelected(false); interruptCountdown(); BaiduNaviManagerFactory.getRouteResultManager().selectRoute(1); BaiduNaviManagerFactory.getRouteResultManager().fullView(); mRouteList.clear(); mRouteList.addAll(mRouteDetails.get(1)); mResultAdapter.notifyItemChanged(1); break; 其中checkRoutePlanItemsValidity(mRoutePlanItems);具体代码如下： public void checkRoutePlanItemsValidity(List<BNRoutePlanItem> mRoutePlanItems) { if (mRoutePlanItems == null || mRoutePlanItems.size() < 1 || mRoutePlanItems.get(0) == null) { Log.d("TAGAA", "checkRoutePlanItemsValidity: 111"); return; } if (mRoutePlanItems.size() < 2 || mRoutePlanItems.get(1) == null) { Log.d("TAGAA", "checkRoutePlanItemsValidity: 222"); return; } if (mRoutePlanItems.size() < 3 || mRoutePlanItems.get(2) == null) { Log.d("TAGAA", "checkRoutePlanItemsValidity: 333"); return; } } 帮我修改一下

可以在方法内部加入一个判断，当传入的 mRoutePlanItems 为空时直接返回，避免空指针异常。修改后的代码如下：

public void checkRoutePlanItemsValidity(List<BNRoutePlanItem> mRoutePlanItems) {
    if (mRoutePlanItems == null || mRoutePlanItems.size() < 1 || mRoutePlanItems.get(0) == null) {
        Log.d("TAGAA", "checkRoutePlanItemsValidity: 111");
        return;
    }
    if (mRoutePlanItems.size() < 2 || mRoutePlanItems.get(1) == null) {
        Log.d("TAGAA", "checkRoutePlanItemsValidity: 222");
        return;
    }
    if (mRoutePlanItems.size() < 3 || mRoutePlanItems.get(2) == null) {
        Log.d("TAGAA", "checkRoutePlanItemsValidity: 333");
        return;
    }
    // 添加判断，当传入的 mRoutePlanItems 为空时直接返回
    if (mRoutePlanItems.isEmpty()) {
        Log.d("TAGAA", "checkRoutePlanItemsValidity: mRoutePlanItems is empty");
        return;
    }
}