Question

我使用Gson lib将json stirng反序列化为Java对象，但是发生了错误。
下面是json字符串：



    {
        "pageInfo": [
          {
            "detail": "{\"key1\":\"value1\",\"key2\":\"value2\"}",
            "id": 4,
            "type": 0
          }]
    }

和java类：



    public java.util.List pageInfo;
    class CreditDetailItem {
        public String id;
        public int type;
        public String detail;
    }

然后抛出一个异常：预期BEGIN_OBJECT但在＆＃39;细节＆＃39;上是STRING 属性。

有没有人可以帮助我？

Answer 1

是的，JSON与Java代码不匹配。以下是在JAVA中进行此操作的推荐方法。

class JSONWrapper {
    java.util.List<PageInfo> pageInfo = new java.util.ArrayList<PageInfo>();

    public void setPageInfo(java.util.List<PageInfo> pageInfo) {
        this.pageInfo = pageInfo;
    }
    public java.util.List<PageInfo> getPageInfo() {
        return pageInfo;
    }
}

class PageInfo {
    String id;
    int type;
    String detail;

    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public int getType() {
        return type;
    }
    public void setType(int type) {
        this.type = type;
    }
    public String getDetail() {
        return detail;
    }
    public void setDetail(String detail) {
        this.detail = detail;
    }
}

Answer 2

假设这是您格式化的E/dalvikvm: Could not find class 'android.util.ArrayMap', referenced from method com.android.tools.fd.runtime.Restarter.getActivities W/dalvikvm: VFY: unable to resolve instanceof 2042 (Landroid/util/ArrayMap;) in Lcom/android/tools/fd/runtime/Restarter; D/dalvikvm: VFY: replacing opcode 0x20 at 0x006f I/dalvikvm: Could not find method android.app.Activity.getColor, referenced from method catalog.raulfmiranda.com.catalog.ui.adapter.CategoriaRecyclerAdapter.onBindViewHolder W/dalvikvm: VFY: unable to resolve virtual method 58: Landroid/app/Activity;.getColor (I)I D/dalvikvm: VFY: replacing opcode 0x6e at 0x0058 I/dalvikvm: Could not find method android.app.Activity.getColor, referenced from method catalog.raulfmiranda.com.catalog.ui.adapter.CategoriaRecyclerAdapter.onBindViewHolder W/dalvikvm: VFY: unable to resolve virtual method 58: Landroid/app/Activity;.getColor (I)I D/dalvikvm: VFY: replacing opcode 0x6e at 0x0067 D/AndroidRuntime: Shutting down VM W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x41a7a8c8) E/AndroidRuntime: FATAL EXCEPTION: main java.lang.NoSuchMethodError: android.app.Activity.getColor at catalog.raulfmiranda.com.catalog.ui.adapter.CategoriaRecyclerAdapter.onBindViewHolder(CategoriaRecyclerAdapter.java:52) at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5825)数据。

JSON

试试这个{ "pageInfo": [ { "detail": { "key1": "value1", "key2": "value2" }, "id": 4, "type": 0 }] }课程，

POJO

解析public class ParsedData { List<CreditDetailItem> pageInfo = new ArrayList<CreditDetailItem>(); class CreditDetailItem { public String id; public int type; public Detail detail; //getters and setters } public class Detail { public String key1; public String key2; //getters and setters } }，

JSON

Answer 3

检查这个，它为我工作。

如果不存在，则在build.gradle中添加依赖项：

compile("com.google.code.gson:gson:2.8.0")

这是你的JSONObject：

{
    "pageInfo": [
      {
        "detail": "{\"key1\":\"value1\",\"key2\":\"value2\"}",
        "id": 4,
        "type": 0
      }
    ]
}

这是您的pageinfo列表模型类：

public class MyModelList {

    public List<MyModel> pageInfo = new ArrayList();
}

这适用于您的pageinfo列表项模型类：

public class MyModel {
    public String id;
    public int type;
    public String detail;
}

这是您可以为单独的项目或列表模型检查gson到json和副版本转换的方法：

private void myGson() {
        GsonBuilder gsonBuilder = new GsonBuilder();
        Gson gson = gsonBuilder.create();

        //Convert to java objects
        MyModel mModel = gson.fromJson("{\n" +
                        "            \"detail\": \"{\\\"key1\\\":\\\"value1\\\",\\\"key2\\\":\\\"value2\\\"}\",\n" +
                        "            \"id\": 4,\n" +
                        "            \"type\": 0\n" +
                        "          }"
                , MyModel.class);

        MyModelList mModelList = gson.fromJson("{\n" +
                        "        \"pageInfo\": [\n" +
                        "          {\n" +
                        "            \"detail\": \"{\\\"key1\\\":\\\"value1\\\",\\\"key2\\\":\\\"value2\\\"}\",\n" +
                        "            \"id\": 4,\n" +
                        "            \"type\": 0\n" +
                        "          }" +
                        "]\n" +
                        "    }"
                , MyModelList.class);
        Log.e("TAG", mModel.toString());
        Log.e("TAG", mModelList.toString());

        //Convert to JSON
        String sModelList = gson.toJson(mModelList);
        String sModel = gson.toJson(mModel);
    }

Answer 4

public class CreditDetailItem {

@SerializedName（“pageInfo”）
@expose
public List pageInfo = new ArrayList（）;

公共类PageInfo {

@SerializedName（“detail”）
@expose
public String detail;

@SerializedName（“id”）
@expose
public Integer id;

@SerializedName（“type”）
@expose
public Integer type;
}

}

Gson将json字符串转换为java对象时出现异常

4 个答案: