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Mayank Raj 22Mayank Raj 22 

Can someone tell me what is the issue with this code. I don't seem to get the value displayed in the VF Page.

Controller:

/* This class is used to display a list of contacts from a rest api (https://api.androidhive.info/contacts/) to a VF Page and also has a checkbox to save the desired Contact wihtin the Org*/
public class restIntegrationPageController {
    
    List<Contact> conList{get;set;}
    public class wrapperforJSON{
        public string id{get;set;}
        public string name{get;set;}
        public String email{get;set;}
        public string address{get;set;}
        public string gender{get;set;}
        public string mobile{get;set;}
        public boolean isChecked{get;set;}
    }
    public List<wrapperforJSON> rList{get;set;}
    public wrapperforJSON singleRec{get;set;}
    public void  Method1(){
        Http http = new Http();
        HttpRequest request = new HttpRequest();
        request.setEndPoint('https://api.androidhive.info/contacts/');
        request.setMethod('GET');
        HttpResponse response = http.send(request);
        List<String> idList = new List<String>();
        List<String> nameList = new List<String>();
        List<String> emailList = new List<String>();
        List<String> addressList = new List<String>();
        List<String> genderList = new List<String>();
        List<String> mobileList = new List<String>();
        JSONParser parser = JSON.createParser(response.getBody());
        while(parser.nextToken() != null){
            if(parser.getCurrentToken() == JSONToken.FIELD_NAME && parser.getText() == 'id'){
                parser.nextToken();
                idList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONTOKEN.FIELD_NAME && parser.getText() == 'Name'){
                parser.nextToken();
                nameList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONToken.FIELD_NAME && parser.getText() == 'Email'){
                parser.nextToken();
                emailList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONToken.FIELD_NAME && parser.getText() == 'Address'){
                parser.nextToken();
                addressList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONToken.FIELD_Name && parser.getText() == 'Gender'){
                parser.nextToken();
                genderList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONToken.FielD_Name && parser.getText() == 'Mobile'){
                parser.nextToken();
                mobileList.add(parser.getText());
            }
         
        }
       rList = new List<wrapperforJSON>();
       for(Integer i=0;i<idList.size();i++){
           singleRec = new wrapperforJSON();
               singleRec.id = idList[i];
               singleRec.name = nameList[i];
               singleRec.email = emailList[i];
               singleRec.Address = addressList[i];
               singleRec.Gender = genderList[i];
               singleRec.Mobile = mobileList[i];
               singleRec.isChecked = False;
           rList.add(singleRec);
               
       }    
    }
}


VF:

<apex:page controller="restIntegrationPageController">
<apex:form >
<apex:pageBlock title="Rest Integration Example 1">
    <apex:pageBlockTable value="{!rList}" var="r">
        <apex:column value="{!r.Id}" headerValue="Id"/>
    </apex:pageBlockTable>
</apex:pageBlock>

</apex:form>
</apex:page>
Best Answer chosen by Mayank Raj 22
Steven NsubugaSteven Nsubuga
Yeah, you did not call Method1() at all!!
I have created a constructor and called method1 inside it. 
public class restIntegrationPageController {
    
    List<Contact> conList{get;set;}
    public class wrapperforJSON{
        public string id{get;set;}
        public string name{get;set;}
        public String email{get;set;}
        public string address{get;set;}
        public string gender{get;set;}
        public string mobile{get;set;}
        public boolean isChecked{get;set;}
    }
    
    public restIntegrationPageController() {
        Method1();
    }
    public List<wrapperforJSON> rList{get;set;}
    public wrapperforJSON singleRec{get;set;}
    public void  Method1(){
        Http http = new Http();
        HttpRequest request = new HttpRequest();
        request.setEndPoint('https://api.androidhive.info/contacts/');
        request.setMethod('GET');
        HttpResponse response = http.send(request);
        List<String> idList = new List<String>();
        List<String> nameList = new List<String>();
        List<String> emailList = new List<String>();
        List<String> addressList = new List<String>();
        List<String> genderList = new List<String>();
        List<String> mobileList = new List<String>();
        JSONParser parser = JSON.createParser(response.getBody());
        while(parser.nextToken() != null){
            if(parser.getCurrentToken() == JSONToken.FIELD_NAME && parser.getText() == 'id'){
                parser.nextToken();
                idList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONTOKEN.FIELD_NAME && parser.getText() == 'Name'){
                parser.nextToken();
                nameList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONToken.FIELD_NAME && parser.getText() == 'Email'){
                parser.nextToken();
                emailList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONToken.FIELD_NAME && parser.getText() == 'Address'){
                parser.nextToken();
                addressList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONToken.FIELD_Name && parser.getText() == 'Gender'){
                parser.nextToken();
                genderList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONToken.FielD_Name && parser.getText() == 'Mobile'){
                parser.nextToken();
                mobileList.add(parser.getText());
            }
         
        }
       rList = new List<wrapperforJSON>();
       for(Integer i=0;i<idList.size();i++){
           singleRec = new wrapperforJSON();
               singleRec.id = idList[i];
               singleRec.name = nameList[i];
               singleRec.email = emailList[i];
               singleRec.Address = addressList[i];
               singleRec.Gender = genderList[i];
               singleRec.Mobile = mobileList[i];
               singleRec.isChecked = False;
           rList.add(singleRec);
               
       }    
    }
}

Do not forget to add a remote site setting for the url

All Answers

Steven NsubugaSteven Nsubuga
Yeah, you did not call Method1() at all!!
I have created a constructor and called method1 inside it. 
public class restIntegrationPageController {
    
    List<Contact> conList{get;set;}
    public class wrapperforJSON{
        public string id{get;set;}
        public string name{get;set;}
        public String email{get;set;}
        public string address{get;set;}
        public string gender{get;set;}
        public string mobile{get;set;}
        public boolean isChecked{get;set;}
    }
    
    public restIntegrationPageController() {
        Method1();
    }
    public List<wrapperforJSON> rList{get;set;}
    public wrapperforJSON singleRec{get;set;}
    public void  Method1(){
        Http http = new Http();
        HttpRequest request = new HttpRequest();
        request.setEndPoint('https://api.androidhive.info/contacts/');
        request.setMethod('GET');
        HttpResponse response = http.send(request);
        List<String> idList = new List<String>();
        List<String> nameList = new List<String>();
        List<String> emailList = new List<String>();
        List<String> addressList = new List<String>();
        List<String> genderList = new List<String>();
        List<String> mobileList = new List<String>();
        JSONParser parser = JSON.createParser(response.getBody());
        while(parser.nextToken() != null){
            if(parser.getCurrentToken() == JSONToken.FIELD_NAME && parser.getText() == 'id'){
                parser.nextToken();
                idList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONTOKEN.FIELD_NAME && parser.getText() == 'Name'){
                parser.nextToken();
                nameList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONToken.FIELD_NAME && parser.getText() == 'Email'){
                parser.nextToken();
                emailList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONToken.FIELD_NAME && parser.getText() == 'Address'){
                parser.nextToken();
                addressList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONToken.FIELD_Name && parser.getText() == 'Gender'){
                parser.nextToken();
                genderList.add(parser.getText());
            }
            if(parser.getCurrentToken() == JSONToken.FielD_Name && parser.getText() == 'Mobile'){
                parser.nextToken();
                mobileList.add(parser.getText());
            }
         
        }
       rList = new List<wrapperforJSON>();
       for(Integer i=0;i<idList.size();i++){
           singleRec = new wrapperforJSON();
               singleRec.id = idList[i];
               singleRec.name = nameList[i];
               singleRec.email = emailList[i];
               singleRec.Address = addressList[i];
               singleRec.Gender = genderList[i];
               singleRec.Mobile = mobileList[i];
               singleRec.isChecked = False;
           rList.add(singleRec);
               
       }    
    }
}

Do not forget to add a remote site setting for the url
This was selected as the best answer
Mayank Raj 22Mayank Raj 22
Thanks Steven. That helped.
Steven NsubugaSteven Nsubuga
My pleasure Mayank, please mark it as a best answer so as to resolve the question.