java - java.lang.IndexOutOfBoundsException:使用try，catch

当我从服务器获取图像时，一些餐厅分别具有1个菜单，4个菜单，5个菜单等。因此，我将try catch用于IndexOutOfBoundsException，但如果餐厅有1个菜单，则菜单下方不会显示其他数据（例如位置）。例如。第一个线性布局是菜单，第二个线性布局是位置，等等。如果餐厅有4个菜单，则会显示位置。当我经营餐厅时，有1个菜单，java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1

在餐厅

    "id": "1",
    "menus_count": 1,
    "menus": [
      {
        "id": 27,
        "menuImage": "e90573d2662eaa8d35b35c9cfcde2ee0.jpg"
      }
    ],

在另一家餐厅

    "id": "2",
    "menus_count": 5,
    "menus": [
      {
        "id": 22,
        "menuImage": "ee7e8f69f24dbba3c65d043192466be0.jpg"
      },
      {
        "id": 20,
        "menuImage": "64eaeb5c50f38c94ea65fe7e412047be.jpg"
      },
      {
        "id": 12,
        "menuImage": "5fc3b5f41a49da0281ee3f970cb64d26.jpg"
      },
      {
        "id": 9,
        "menuImage": "e56fa9fcbdeec32a94216e080de35952.jpg"
      }
    ],

餐厅Activity.java

try {
    if (restaurant.getMenus() != null && restaurant.getMenus().size() > 0) {
        Picasso.with(context).load("http://example.com/uploads/menus/" + restaurant.getMenus().get(0).getMenuImage()).into(img_menu_zero);
        linearlayout_menu_zero.setVisibility(View.VISIBLE);
        Picasso.with(context).load("http://example.com/uploads/menus/" + restaurant.getMenus().get(1).getMenuImage()).into(img_menu_one);
        linearlayout_menu_one.setVisibility(View.VISIBLE);
        Picasso.with(context).load("http://example.com/uploads/menus/" + restaurant.getMenus().get(2).getMenuImage()).into(img_menu_two);
        linearlayout_menu_two.setVisibility(View.VISIBLE);
        Picasso.with(context).load("http://example.com/uploads/menus/" + restaurant.getMenus().get(3).getMenuImage()).into(img_menu_three);
        linearlayout_menu_three.setVisibility(View.VISIBLE);
    }
    txt_locality_township.setText(restaurant.getLocality() + ", " + restaurant.getTownshipName());
} catch (NullPointerException | IndexOutOfBoundsException e) {
    e.printStackTrace();
}

在详细中

04-26 10:08:38.896 26119-26119/com.eg.restaurant W/System.err: java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1
04-26 10:08:38.896 26119-26119/com.eg.restaurant W/System.err:     at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
04-26 10:08:38.896 26119-26119/com.eg.restaurant W/System.err:     at java.util.ArrayList.get(ArrayList.java:308)
04-26 10:08:38.896 26119-26119/com.eg.restaurant W/System.err:     at com.wpg.hungryhopper.RestaurantActivity$1.success(RestaurantActivity.java:219)
04-26 10:08:38.896 26119-26119/com.eg.restaurant W/System.err:     at com.wpg.hungryhopper.RestaurantActivity$1.success(RestaurantActivity.java:150)
04-26 10:08:38.896 26119-26119/com.eg.restaurant W/System.err:     at retrofit.CallbackRunnable$1.run(CallbackRunnable.java:45)
04-26 10:08:38.896 26119-26119/com.eg.restaurant W/System.err:     at android.os.Handler.handleCallback(Handler.java:739)
04-26 10:08:38.896 26119-26119/com.eg.restaurant W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:95)
04-26 10:08:38.896 26119-26119/com.eg.restaurant W/System.err:     at android.os.Looper.loop(Looper.java:135)
04-26 10:08:38.896 26119-26119/com.eg.restaurant W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:5669)
04-26 10:08:38.896 26119-26119/com.eg.restaurant W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
04-26 10:08:38.896 26119-26119/com.eg.restaurant W/System.err:     at java.lang.reflect.Method.invoke(Method.java:372)
04-26 10:08:38.896 26119-26119/com.eg.restaurant W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)
04-26 10:08:38.896 26119-26119/com.eg.restaurant W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

最佳答案

问题出在您的逻辑上，即使您仍在呼叫列表中的菜单项有1个

restaurant.getMenus().get(2)

这将使数组超出范围异常

if (restaurant.getMenus() != null && restaurant.getMenus().size() > 0) {
        Picasso.with(context).load("http://example.com/uploads/menus/" + restaurant.getMenus().get(0).getMenuImage()).into(img_menu_zero);
        linearlayout_menu_zero.setVisibility(View.VISIBLE);
        Picasso.with(context).load("http://example.com/uploads/menus/" + restaurant.getMenus().get(1).getMenuImage()).into(img_menu_one);
        linearlayout_menu_one.setVisibility(View.VISIBLE);
        Picasso.with(context).load("http://example.com/uploads/menus/" + restaurant.getMenus().get(2).getMenuImage()).into(img_menu_two);
        linearlayout_menu_two.setVisibility(View.VISIBLE);
        Picasso.with(context).load("http://example.com/uploads/menus/" + restaurant.getMenus().get(3).getMenuImage()).into(img_menu_three);
        linearlayout_menu_three.setVisibility(View.VISIBLE);
    }

应该

if (restaurant.getMenus() != null && restaurant.getMenus().size() > 0) {
        Picasso.with(context).load("http://example.com/uploads/menus/" + restaurant.getMenus().get(0).getMenuImage()).into(img_menu_zero);
        linearlayout_menu_zero.setVisibility(View.VISIBLE);
        if(restaurant.getMenus().size()>=2){
        Picasso.with(context).load("http://ex}{ample.com/uploads/menus/" + restaurant.getMenus().get(1).getMenuImage()).into(img_menu_one);
        linearlayout_menu_one.setVisibility(View.VISIBLE);}
if(restaurant.getMenus().size()>=3){
        Picasso.with(context).load("http://example.com/uploads/menus/" + restaurant.getMenus().get(2).getMenuImage()).into(img_menu_two);
        linearlayout_menu_two.setVisibility(View.VISIBLE);}
if(restaurant.getMenus().size()>=4){
        Picasso.with(context).load("http://example.com/uploads/menus/" + restaurant.getMenus().get(3).getMenuImage()).into(img_menu_three);
        linearlayout_menu_three.setVisibility(View.VISIBLE);}

    }

我在这里编写的代码非常糟糕，但是我的目的是向您展示如何解决此问题以及代码中为什么会出现此异常，也可以尝试在Linear布局中动态制作ImageViews，以使此代码更好，这将提供即使有100个菜单页面而不更改任何代码，并且布局中具有静态菜单页面，您也可能会增加图像数量。