好的，所以我正在使用api，因为一个JSON参数可以返回两种不同的类型。所以我可以从服务器接收JSON对象或字符串。我对Android开发很陌生，所以如果有人可以通过代码示例向我解释如何处理这个问题。
json回复示例{视频：＆＃34;视频ID＆＃34;}或{视频：{id：＆＃34;视频ID＆＃34;，...额外数据}}。我查看了自定义解串器，但无法找到易于遵循的示例。必须有一种简单的方法来解决我的问题。目前我收到错误＆＃34;预期字符串但发现BEGIN OBJECT＆＃34;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class MyNotification {
@SerializedName("_id")
@Expose
private String Id;
@SerializedName("comment")
@Expose
private String comment;
@SerializedName("createdAt")
@Expose
private String createdAt;
@SerializedName("message")
@Expose
private String message;
@SerializedName("read")
@Expose
private Boolean read;
@SerializedName("recipient")
@Expose
private String recipient;
@SerializedName("sender")
@Expose
private User sender;
@SerializedName("type")
@Expose
private String type;
// @SerializedName("video")
// @Expose
// private String video;
/**
*
* @return
* The Id
*/
public String getId() {
return Id;
}
/**
*
* @param Id
* The _id
*/
public void setId(String Id) {
this.Id = Id;
}
/**
*
* @return
* The comment
*/
public String getComment() {
return comment;
}
/**
*
* @param comment
* The comment
*/
public void setComment(String comment) {
this.comment = comment;
}
/**
*
* @return
* The createdAt
*/
public String getCreatedAt() {
return createdAt;
}
/**
*
* @param createdAt
* The createdAt
*/
public void setCreatedAt(String createdAt) {
this.createdAt = createdAt;
}
/**
*
* @return
* The message
*/
public String getMessage() {
return message;
}
/**
*
* @param message
* The message
*/
public void setMessage(String message) {
this.message = message;
}
/**
*
* @return
* The read
*/
public Boolean getRead() {
return read;
}
/**
*
* @param read
* The read
*/
public void setRead(Boolean read) {
this.read = read;
}
/**
*
* @return
* The recipient
*/
public String getRecipient() {
return recipient;
}
/**
*
* @param recipient
* The recipient
*/
public void setRecipient(String recipient) {
this.recipient = recipient;
}
/**
*
* @return
* The sender
*/
public User getSender() {
return sender;
}
/**
*
* @param sender
* The sender
*/
public void setSender(User sender) {
this.sender = sender;
}
/**
*
* @return
* The type
*/
public String getType() {
return type;
}
/**
*
* @param type
* The type
*/
public void setType(String type) {
this.type = type;
}
// /**
// *
// * @return
// * The video
// */
// public String getVideo() {
// return video;
// }
//
// /**
// *
// * @param video
// * The video
// */
// public void setVideo(String video) {
// this.video = video;
// }
}
和劈开的部分
Gson gson = new Gson();
String jsonString = String.valueOf(dataset);
Type listType = new TypeToken<List<MyNotification>>(){}.getType();
notficationsList = (List<MyNotification>) gson.fromJson(jsonString, listType);
答案 0 :(得分：1)
对不起，花了这么长时间：
如果必须将JSON映射到对象，最好的办法是修复JSON。
尝试使用以下代码清理JSON：
public static String cleanJson(String json) {
int videoPos = json.indexOf("video");
if(videoPos == -1) {
return json; //return, no video here
}
boolean isObject = false;
int objectBegin = -1;
String cleanedJson = json.replaceAll("\\\"", "\\\\");
for(int i = videoPos; i < cleanedJson.length(); i++) {
if(cleanedJson.charAt(i) == '"') {
System.out.println("string");
return json; // its a string anyway
}
if(cleanedJson.charAt(i) == '{') {
//its an object
// i now is the position beginning the object
objectBegin = i;
}
} //replace " with space
if(objectBegin == -1) {// we did not find any { or " it is a string
return json;
}
boolean inString = false;
int objectEnd = -1;
for(int i = objectBegin; i < cleanedJson.length(); i++) {
//looking for the end of the object;
if(cleanedJson.charAt(i) == '"') inString = !inString;
if(cleanedJson.charAt(i) == '}') {
objectEnd = i;
break;
}
}
if(objectEnd != -1) {
String start = json.substring(0,objectBegin);
String videoPart = json.substring(objectBegin, objectEnd+1);
String end = json.substring(objectEnd+1);
// now we want to get the id
String newVideoPart = "";
int idStart = videoPart.indexOf("id");
int idStringStart = -1;
int idStringEnd = -1;
for(int i = idStart; i < videoPart.length(); i++) {
if(videoPart.charAt(i) == '"') {
if(idStringStart == -1) {
idStringStart = i;
} else {
idStringEnd = i;
break;
}
}
}
if(idStringStart != -1 && idStringEnd != -1) {
newVideoPart = videoPart.substring(idStringStart, idStringEnd+1);
}
return start+newVideoPart+end;
}
return json;
}
使用这两个测试jsons：
System.out.println(cleanJson("{video:\"1234\"}"));
System.out.println(cleanJson("{video:{id:\"2345\", name=\"test\"}}"));
试试这样：
notficationsList = (List<MyNotification>) gson.fromJson(cleanJson(jsonString), listType);
答案 1 :(得分：0)
好的，所以我选择的解决方案是我编写了自己的类型适配器，gson允许你使用
public class Helper_StringAdapter extends TypeAdapter<String>{
@Override
public String read(com.google.gson.stream.JsonReader in) throws IOException {
if(in.peek() == JsonToken.NULL){
in.nextNull();
return null;
}else if(in.peek() == JsonToken.BEGIN_OBJECT && in.getPath().contains(".video")){
L.e("VIDEO IS AN OBJECT!");
String userId = readAndReturnVideoId(in);
return userId;
}else{
return in.nextString();
}
}
private String readAndReturnVideoId(com.google.gson.stream.JsonReader reader) throws IOException{
String id = "";
reader.beginObject();
while(reader.hasNext()){
String name = reader.nextName();
if(name.equals("_id")){
id = reader.nextString();
}else{
reader.skipValue();
}
}
reader.endObject();
L.e("READ ID RETURNED"+id);
return id;
}
@Override
public void write(com.google.gson.stream.JsonWriter out, String value) throws IOException {
L.e("TEST "+out);
}
}
然后在我的活动数据管理器（Recyclerview Adapter）
中public void updateData (JSONArray dataset) {
GsonBuilder gsonb = new GsonBuilder();
gsonb.registerTypeAdapter(String.class,new Helper_StringAdapter());
Gson gson = gsonb.create();
String jsonString = String.valueOf(dataset);
Type listType = new TypeToken<List<FrameNotification>>(){}.getType();
notficationsList = (List<FrameNotification>) gson.fromJson(jsonString, listType);
}
似乎要做的工作