android - How to retrieve web service values through Retrofit to text view? -

i'm developing app , in first activity has card view layout. i'm retrieving data webservice , relevant data showed in card view. it's working well. when user clicks particular card view need go activity. i'm getting relevant id card view , passing second activity. in second activity need show content according unique id. i'm not getting thing. tried.

pojo class

public class promodetails {  string promoid; string promoname; string promoimg; string promodetails; string promovalidty;  public promodetails(string promoid, string promoname, string promoimg , string promodetails , string promovalidity) {     this.promoid = promoid;     this.promoname = promoname;     this.promoimg = promoimg;     this.promodetails = promodetails;     this.promovalidty = promovalidity; }    public string getpromoid() {     return promoid; }  public void setpromoid(string promoid) {     promoid = promoid; }  public string getpromoname() {     return promoname; }  public void setpromoname(string promoname) {     promoname = promoname; }  public string getpromoimg() {     return promoimg; }  public void setpromoimg(string promoimg) {     promoimg = promoimg; }  public string getpromodetails() {     return promodetails; }  public void setpromodetails(string promodetails) {     this.promodetails = promodetails; }  public string getpromovalidty() {     return promovalidty; }  public void setpromovalidty(string promovalidty) {     this.promovalidty = promovalidty; }} 

apiinterface

public interface apiinterface {   @post("ap/promotions.php") call<list<promotions>> getpromotions();  @get("test.php/promotions/{promoid}") call<list<promodetails>> getpromotdetails(@path("promoid") string promoid) ;} 

new activity class

public class promotionsinside extends activity {   private apiinterface apiinterface; private list<promodetails> promodetails; textview prdescription;    @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.promo_inside);       bundle extras = getintent().getextras();      string promoid = "";      if (extras != null) {         promoid = extras.getstring("promo_id");         getpromotionupdate(promoid);     }  }   private void getpromotionupdate(string mypromoid) {       apiinterface = apiclient.getapiclient().create(apiinterface.class);       call<list<promodetails>> call = apiinterface.getpromotdetails(mypromoid);     call.enqueue(new callback<list<promodetails>>() {         @override         public void onresponse(call<list<promodetails>> call, response<list<promodetails>> response) {             promodetails = response.body();              runonuithread(new runnable() {                 @override                 public void run() {   prdescription = (textview)findviewbyid(r.id.promodescriptionsss) ;  prdescription.settext(promodetails.get(0).getpromoname());                 }             });           }          @override         public void onfailure(call<list<promodetails>> call, throwable t) {          }     });   }} 

i have similar case. try use start second activity:

    intent intent = new intent(this, promotionsinside.class); //make sure put string id in intent     intent.putextra("promo_id", id);      startactivity(intent); 

and in second activity:

if (getintent().hasextra("promo_id")) {         string id = getintent().getstringextra("promo_id", null);         //next steps need     } 

hope you