GSON Parsing 在解析空 JSONArray 时抛出异常

Question

整个 JSON 被解析并使用 GSON 转换为其对应的模型对象。 由于某些原因，如果JSONArray“视频”为空，GSON 会抛出异常。 解析JSONArray“video”时，如果数组为空-([])，则解析会抛出异常

com.google.gson.JsonSyntaxException：java.lang.IllegalStateException：应为 BEGIN_ARRAY，但在第 1 行第 445 列路径 $.video 处为 STRING。

如果“视频”是一个空的 JsonArray，我需要的是指向该 jsonarray 的模型对象需要为空。

视频模型对象：

public class Video {

@SerializedName("date")
@Expose
private String date;
@SerializedName("video_list")
@Expose
private List<VideoList> videoList = null;

public String getDate() {
    return date;
}

public void setDate(String date) {
    this.date = date;
}

public List<VideoList> getVideoList() {
    return videoList;
}

public void setVideoList(List<VideoList> videoList) {
    this.videoList = videoList;
}

public static List<CustomVideoList> getCustomizedVideoList(List<Video> videos) {
    List<CustomVideoList> customVideoList = new ArrayList<>();
    if (videos != null && videos.size() > 0) {
        for (Video video : videos) {
            String headerDate = "";
            CustomVideoList customVideoHeader = new CustomVideoList();
            customVideoHeader.setHeader(true);
            headerDate = video.getDate();
            customVideoHeader.setHeaderDate(headerDate);
            customVideoList.add(customVideoHeader);

            for (VideoList videoList : video.getVideoList()) {
                CustomVideoList customVideo = new CustomVideoList();

                customVideo.setId(videoList.getId());
                customVideo.setScvName(videoList.getScvName());
                customVideo.setScvDescription(videoList.getScvDescription());
                customVideo.setScvComments(videoList.getScvComments());
                customVideo.setScvStatus(videoList.getScvStatus());
                customVideo.setScvType(videoList.getScvType());
                customVideo.setScvUrl(videoList.getScvUrl());
                customVideo.setIdPlayer(videoList.getIdPlayer());
                customVideo.setScvCreatedby(videoList.getScvCreatedby());
                customVideo.setScvCreated(videoList.getScvCreated());
                customVideo.setScvModifiedby(videoList.getScvModifiedby());
                customVideo.setScvModified(videoList.getScvModified());
                customVideo.setScvThumb(videoList.getScvThumb());
                customVideo.setHeaderDate(headerDate);
                customVideoList.add(customVideo);
            }
        }
    }
    return customVideoList;
}

}

由于“视频”为空 JSONArray 导致异常的 Json：

{
"status": 1,
"status_code": 101,
"message": "Success",
"player": [{
    "ID": "5",
    "user_name": "player2",
    "user_email": "player2@gmail.com",
    "mem_name": "player2",
    "player_pic": "dp3.png",
    "mem_address": "player2 address",
    "mem_location": "player2 location",
    "mem_gender": "1",
    "mem_dob": "2018-07-17 00:00:00",
    "mem_joined": "2018-07-17 00:00:00",
    "mem_createdby": "2",
    "mem_created": "2018-07-17 00:00:00",
    "mem_modifiedby": "2",
    "mem_modified": "2018-07-17 00:00:00"
}],
"video": [],
"image": []
}

解析成功的Json

{
"status": 1,
"status_code": 101,
"message": "Success",
"player": [
    {
        "ID": "4",
        "user_name": "player",
        "user_email": "player1@gmail.com",
        "mem_name": "player",
        "player_pic": "dp2.png",
        "mem_address": "player address",
        "mem_location": "player location",
        "mem_gender": "1",
        "mem_dob": "2018-07-17 00:00:00",
        "mem_joined": "2018-07-17 00:00:00",
        "mem_createdby": "2",
        "mem_created": "2018-07-17 00:00:00",
        "mem_modifiedby": "2",
        "mem_modified": "2018-07-17 00:00:00"
    }
],
"video": [
    {
        "date": "21/07/2018",
        "video_list": [
            {
                "id": "1",
                "scv_name": "Practice 1",
                "scv_description": "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.",
                "scv_comments": "Lorem Ipsum is simply dummy text",
                "scv_status": "1",
                "scv_type": "1",
                "scv_thumb": "3.jpg",
                "scv_url": "3.mp4",
                "id_player": "4",
                "scv_createdby": "5",
                "scv_created": "2018-07-21 00:00:00",
                "scv_modifiedby": "5",
                "scv_modified": "2018-07-21 00:00:00"
            },
            {
                "id": "3",
                "scv_name": "Practice 3",
                "scv_description": "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.",
                "scv_comments": "Lorem Ipsum is simply dummy text",
                "scv_status": "1",
                "scv_type": "1",
                "scv_thumb": "2.jpg",
                "scv_url": "2.mp4",
                "id_player": "4",
                "scv_createdby": "5",
                "scv_created": "2018-07-21 00:00:00",
                "scv_modifiedby": "5",
                "scv_modified": "2018-07-21 00:00:00"
            },
            {
                "id": "4",
                "scv_name": "Practice 3",
                "scv_description": "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.",
                "scv_comments": "Lorem Ipsum is simply dummy text",
                "scv_status": "1",
                "scv_type": "1",
                "scv_thumb": "3.jpg",
                "scv_url": "3.mp4",
                "id_player": "4",
                "scv_createdby": "5",
                "scv_created": "2018-07-21 00:00:00",
                "scv_modifiedby": "5",
                "scv_modified": "2018-07-21 00:00:00"
            }
        ]
    },
    {
        "date": "20/07/2018",
        "video_list": [
            {
                "id": "2",
                "scv_name": "Practice 2",
                "scv_description": "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.",
                "scv_comments": "Lorem Ipsum is simply dummy text",
                "scv_status": "1",
                "scv_type": "1",
                "scv_thumb": "1.jpg",
                "scv_url": "1.mp4",
                "id_player": "4",
                "scv_createdby": "5",
                "scv_created": "2018-07-20 00:00:00",
                "scv_modifiedby": "5",
                "scv_modified": "2018-07-22 00:00:00"
            },
            {
                "id": "6",
                "scv_name": "Practice 5",
                "scv_description": "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.",
                "scv_comments": "Lorem Ipsum is simply dummy text",
                "scv_status": "1",
                "scv_type": "1",
                "scv_thumb": "3.jpg",
                "scv_url": "3.mp4",
                "id_player": "4",
                "scv_createdby": "7",
                "scv_created": "2018-07-20 00:00:00",
                "scv_modifiedby": "7",
                "scv_modified": "2018-07-21 00:00:00"
            }
        ]
    },
    {
        "date": "18/07/2018",
        "video_list": [
            {
                "id": "8",
                "scv_name": "practice 8",
                "scv_description": "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.",
                "scv_comments": "Lorem Ipsum is simply dummy text",
                "scv_status": "1",
                "scv_type": "1",
                "scv_thumb": "1.jpg",
                "scv_url": "1.mp4",
                "id_player": "4",
                "scv_createdby": "7",
                "scv_created": "2018-07-18 00:00:00",
                "scv_modifiedby": "7",
                "scv_modified": "2018-07-20 00:00:00"
            }
        ]
    }
],
"image": []
}

Answer 1

我无法复制错误。因此，我建议仔细检查您返回的 JSON 字符串。从这个posting，错误意味着返回的值是一个字符串，即"video" : "[]"，而不是"video" : []。另一个post 显示了一个示例。

Answer 2

将null定义改为数组对象

@SerializedName("video_list")
@Expose
private List<VideoList> videoList = null;

改成这段代码

@SerializedName("video_list")
@Expose
private List<VideoList> videoList = new ArrayList<VideoList>();

我遇到了这个问题，我通过更改 null 定义解决了