java - 尝试从保存在 sketchware 中的 map 变量中的 json 对象获取子键值

Question

我有以下 json 作为获取响应:

{
    "global": {
        "name": "Lz Cha0S",
        "uid": xxx,
        "platform": "X1",
        "level": 521,
        "toNextLevelPercent": 31,
        "internalUpdateCount": 22822,
        "bans": {
            "isActive": false,
            "remainingSeconds": 0,
            "last_banReason": "COMPETITIVE_DODGE_COOLDOWN"
        },
        "rank": {
            "rankScore": 4227,
            "rankName": "Gold",
            "rankDiv": 2,
            "rankImg": "https:\/\/api.apexlegendsstatus.com\/assets\/ranks\/gold2.png"
        },
        "battlepass": {
            "level": "-1"
        }
    },
    "realtime": {
        "lobbyState": "open",
        "isOnline": 0,
        "isInGame": 0,
        "canJoin": 0,
        "partyFull": 0,
        "selectedLegend": "Bloodhound"
    },
    "legends": {
        "selected": {
            "LegendName": "Bloodhound",
            "data": [
                {
                    "name": "Kills",
                    "value": 331,
                    "key": "kills"
                },
                {
                    "name": "Beast of the hunt kills",
                    "value": 62,
                    "key": "beast_of_the_hunt_kills"
                },
                {
                    "name": "Season 4 Wins",
                    "value": 20,
                    "key": "wins_season_4"
                }
            ],
            "ImgAssets": {
                "icon": "http:\/\/api.apexlegendsstatus.com\/assets\/icons\/bloodhound.png",
                "banner": "http:\/\/api.apexlegendsstatus.com\/assets\/banners\/bloodhound.jpg"
            }
        },
        "all": {cutted becouse off to much Text...},
    "mozambiquehere_internal": {
        "isNewToDB": false,
        "claimedBy": "-1",
        "APIAccessType": "BASIC",
        "ClusterID": "2",
        "rate_limit": {
            "max_per_second": 3,
            "current_req": "1"
        }
    },
    "total": {
        "kills": {
            "name": "Kills",
            "value": 331
        },
        "beast_of_the_hunt_kills": {
            "name": "Beast of the hunt kills",
            "value": 62
        },
        "wins_season_4": {
            "name": "Season 4 Wins",
            "value": 20
        },
        "kd": {
            "value": -1,
            "name": "KD"
        }
    }
}

我将此 json 保存到带有 skecthware block 的 map

Json [响应] 到 Map [响应] json to map block

现在想要获取全局键中的名称键，但是如果我使用 block

映射[响应]获取 key [名称] Map get key name

它给出一个错误，名称无法找到(空异常)

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference at com.chaos droid.attack.MainActivity$3.onResponse(MainActivity.java:365) se(MainActivity.java:365) at com.chaosdroid.attack.RequestNetwork er$3$2.run(RequestNetworkController.java:171) at android.os.Handler.handleCallback(Handler.java:

873) at

android.os.Handler.dispatchMessage(Handler.ja va:99) at android.os.Looper.loop(Looper.java:193) at android.app.Activity Thread.main(ActivityThread.j ava:6718) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491) ArgsCaller.run(RuntimeInit.java:491)

at com.android.internal.os.ZygoteInit.main(Zygotel nit.java:858)

END APPLICATION

如果我在获取 key block 中使用全局 key ，它将以文本形式返回全局 key

映射[响应]获取 key [全局] get map key global

返回

{name=Lz Cha0S，uid=xxx，platform=X1，level=521.0，toNextLevelPercent=31.0，internalUpdateCount=22822.0，bans={isActive=false，remainingSeconds=0.0，last_banReason=COMPETITIVE_DODGE_COOLDOWN}，rank= {rankScore=4227.0，rankName=Gold，rankDiv=2.0，rankImg=https://api.apexlegendsstatus.com/assets/ranks/gold2.png}，battlepass={level=-1}}

我尝试将该输出保存到新的映射变量，但它不是有效的 json 对象，因此 json to map block 不起作用。

看起来映射值只能存储一个键值而不是子键。当我收到在 get 字段中有错误的响应时，它会返回一个错误 json，如下所示:

{"Error": "找不到玩家。重试吗？"}

在这里我可以使用相同的获取 key block 成功获取 key :映射[响应]获取 key [全局] Get map.key error

我还尝试在直接添加源 block 中使用 Java 解析 json:

JSONObject jObject = new JSONObject(result);

String aJsonString = jObject.getString("name");

但是随后我收到 sketchware 编译器错误，指出 jsonobject 无法解析为类型

1. ERROR in /storage/emulated/0/.sketchware/mysc/717/app/src/main/ java/com/chaosdroid/atrack/MainActivity.java (at line 355) String result = response;

Type mismatch: cannot convert from HashMap<String,Object> to String

2. ERROR in /storage/emulated/0/.sketchware/mysc/717/app/src/main/ java/com/chaos droid/attack/MainActivity.java (at line 357) JSONObject jObject = new JSONObject(result);

JSONObject cannot be resolved to a type

3. ERROR in /storage/emulated/0/.sketchware/mysc/717/app/src/main/ java/com/chaosdroid/atrack/MainActivity.java (at line 357) JSONObject Object = new JSONObject(result);

JSONObject cannot be resolved to a type

3 problems (3 errors)

而且我不知道如何将 jsonobject 导入到 sketchware 中。

如何从这个json中获取global的子键？

编辑:(感谢@Dmytro Kyrychkov)

对于 sketchware 用户:您需要完整声明要使用的函数，因为您无法导入sketchware 中的库。对于此示例，这将在 sketchware 中的直接添加源 block 中工作:

String jsonStr = strResponse; 
Gson gson = new Gson(); 
HashMap<String, Object> json = gson.fromJson(jsonStr, HashMap.class);
com.google.gson.internal.LinkedTreeMap<String, Object> global = (com.google.gson.internal.LinkedTreeMap<String, Object>) json.get("global"); 
String name = (String) global.get("name"); 

Answer 1

如果您想获取 JSON 对象子字段，您应该在解析过程中遵循其结构:

public static void main(String... args) throws IOException {
    String jsonStr = new String(Files.readAllBytes(PATH_TO_JSON));
    Gson gson = new Gson();
    HashMap<String, Object> json =  gson.fromJson(jsonStr, HashMap.class);
    LinkedTreeMap<String, Object> global = (LinkedTreeMap<String, Object>) json.get("global");
    String name = (String) global.get("name");
    System.out.println(name);
}

输出:

Lz Cha0S
Process finished with exit code 0

希望对你有帮助:)