如何使全球对象的数据适应微调 [英] how to adapt the data from global object to spinner

问题描述

我有我的GlobalClass extends 应用程序类。我想将全局对象数据绑定到微调器。这是我的 GlobalClass

  public class GlobalClass extends Application {
 
私人列表< ProjectType> projectTypes; 
 
公共列表< ProjectType> getProjectTypes（）{
 return projectTypes; 
} 
 
 public void setProjectTypes（List< ProjectType> projectTypes）{
 this.projectTypes = projectTypes; 
 
 
 $ / code $ / pre 
 $ b 
 
 
 Pojo class  p> 
 
 
 
 
  public class ProjectType实现Serializable {
 private Integer projectTypeId; 
 private String typeName; 
 private Integer peckOrder; 
 
 // getter and setter here 
  
我得到服务器使用volley和parse使用 GSON 并将响应设置为 GlobalClass  
这里的代码
  JsonArrayRequest jsonArrayRequest = new JsonArrayRequest（Request.Method.GET，getString（R.string.TEST_projectTypeURL），null，new Response.Listener< JSONArray> （）{
 @Override $ b $ public void onResponse（JSONArray response）{
 GlobalClass globalVariable =（GlobalClass）getApplicationContext（）; 
 Gson gson = new Gson（）; 
 List< ProjectType> projectTypes = gson.fromJson（String.valueOf（response），List.class）; 
 globalVariable.setProjectTypes（projectTypes）; 
} 
} 
  
最后在另一个活动类iam中使用微调来绑定来自GlobalClass对象的数据
  globalVari able =（GlobalClass）getApplicationContext（）; 
列表< String> projectTypeList = new ArrayList<>（）; 
 
 ArrayList< ProjectType> projectTypesCollection = new ArrayList< ProjectType>（globalVariable.getProjectTypes（））; （ProjectType projectType：projectTypesCollection）{
 
 projectTypeList.add（projectType.getTypeName（））; 
 
 
} 
 
 prjtTypeSpinner =（微调）findViewById（R.id.spn_prjt_type）; 
 ArrayAdapter< String> dataAdapter = new ArrayAdapter< String>（this，
 android.R.layout.simple_spinner_item，projectTypeList）; 
 dataAdapter.setDropDownViewResource（android.R.layout.simple_spinner_dropdown_item）; 
 prjtTypeSpinner.setAdapter（dataAdapter）; 
  
  尝试上述代码时，我收到一个错误com.google。 gson.internal.LinkedTreeMap不能转换为pojo.ProjectType类。  
 
 
 
这里的对象返回值，
  [{projectTypeId = 3.0，typeName = ALS，peckOrder = 220.0}，{projectTypeId = 2.0，typeName = ALB，peckOrder = 210.0}，{projectTypeId = 1.0 projectNameId = 5.0，typeName = ACB，peckOrder = 200.0} 20.0}，{projectTypeId = 4.0，typeName = CC，peckOrder = 10.0}] 
  
  I需要微调器中的 typeName 。 
 
解决方案
我终于解决了这个问题，
  Arrays.asList（gson.fromJson（response，ProjectType []。class））
  
 当我尝试代码时，我的错误得到解决，此代码很好地工作 
 
I have my GlobalClass extends Application class. I want to bind the global object data to spinner. Here is my GlobalClass
public class GlobalClass extends Application {

private List<ProjectType> projectTypes;

public List<ProjectType> getProjectTypes() {
    return projectTypes;
}

public void setProjectTypes(List<ProjectType> projectTypes) {
    this.projectTypes = projectTypes;
} 
}



  
Pojo class


public class ProjectType implements Serializable {
private Integer projectTypeId;
private String typeName;
private Integer peckOrder;

//getter and setter here
And I get the response from the server using volley and parse using GSON and set the response to GlobalClass
here the code
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.GET, getString(R.string.TEST_projectTypeURL), null, new Response.Listener<JSONArray>() {
        @Override
        public void onResponse(JSONArray response) {
            final GlobalClass globalVariable = (GlobalClass) getApplicationContext();
            Gson gson = new Gson();
            List<ProjectType> projectTypes = gson.fromJson(String.valueOf(response),List.class);
            globalVariable.setProjectTypes(projectTypes);
        }
    }
And finally in another activity class iam using spinner to bind the data from the GlobalClass object
globalVariable = (GlobalClass) getApplicationContext();
    List<String> projectTypeList = new ArrayList<>();

    ArrayList<ProjectType> projectTypesCollection = new ArrayList<ProjectType>(globalVariable.getProjectTypes());

    for (ProjectType projectType: projectTypesCollection) {

        projectTypeList.add(projectType.getTypeName());
    }

    prjtTypeSpinner = (Spinner)findViewById(R.id.spn_prjt_type);
    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item,projectTypeList);
    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    prjtTypeSpinner.setAdapter(dataAdapter);
While trying the above code I am getting an error "com.google.gson.internal.LinkedTreeMap cannot be cast to the pojo.ProjectType class"

here the object return value, 
[{projectTypeId=3.0, typeName=ALS, peckOrder=220.0}, {projectTypeId=2.0, typeName=ALB, peckOrder=210.0}, {projectTypeId=1.0, typeName=CL, peckOrder=200.0}, {projectTypeId=7.0, typeName=ACG, peckOrder=40.0}, {projectTypeId=6.0, typeName=ACS, peckOrder=30.0}, {projectTypeId=5.0, typeName=ACB, peckOrder=20.0}, {projectTypeId=4.0, typeName=CC, peckOrder=10.0}]
I want the typeName in spinner. Thanks in advance.
解决方案
I finally solve this problem,
Arrays.asList(gson.fromJson(response, ProjectType[].class))
when I try the code my error get resolved, this code work well

                        
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