SetText in fragment from outside class-CodePudding

I have a fragment that displays data from APIs, but i dont want to be calling apis everytime the fragment is called.. so am making api call from a different class and and calling a method in the fragment to update UI (textViews) but am getting null exception for the textViews but data is 100% there

and if i try to hardcode textView.setText("Hello") it works..

CodePudding user response：

one of the task of fragment is change ui !!! you must change ui in activity or fragment

you must use interface . your server class :

public class server {
   .
   .
   .
   public void callServer(IServerResponse iResponse){
           .
           .
           . 
           
         iResponse.onResponse(//your data such as List or string or json and etc);
         }

    public interface IServerResponse{
             // use parameter type as you want like List or string ,etc..
         void onResponse(String data);
        }

 }

your fragment or activity implement your interface :

public class SomeFragment extends Fragment implements Server.IServerResponse{
    .... 

   @Override  
   public View onCreateView(...){
      ...
      Server server=new Server();
      server.callServer(this);
    }

  @Override  
  public void IServerResponse(String data){
      textview.SetText(data);

   }
   
  

  }

CodePudding user response：

You should create a FrameLayout in your activity And use this code:

FragmentA newFragment = new FragmentA ();
        FragmentTransaction ft = getFragmentManager().beginTransaction();
        ft.replace(R.id.container, newFragment).commit();

and than set your text

String editValueName= editName.getText().toString();
String lastStatus = valueStatus.getText().toString();
newFragment .setText(editValueName, lastStatus);

CodePudding user response：

Try for quick fix if it is working for the output of your desire
Make Textview static in class(youractivity) where textview is originated like
public static TextView textview;

And in fragment
if(youractivity.textView!=null){ youractivity.textView.setText("your desire text"); }