I have created a repository class for calling api using retrofit in android studio but I am getting null pointer exception when returning the response. Please have a look at the getUserData() method and comments in it to understand the problem better.
public class ContestRepository {
private static ApiInterface apiInterface;
private MutableLiveData<List<User>> userList;
public ContestRepository() {
apiInterface = RetrofitService.getApiInterface();
userList = new MutableLiveData<>();
}
public MutableLiveData<List<User>> getUserData() {
apiInterface.getUserDetails("users").enqueue(new Callback<Root>() {
@Override
public void onResponse(Call<Root> call, Response<Root> response) {
Root result = response.body();
if(result != null) {
String status = result.getStatus();
System.out.println(status);
if(status.equals("OK")) {
userList.setValue(result);
System.out.println(userList.getValue().size()); //here userList is not null
}
}
}
@Override
public void onFailure(Call<Root> call, Throwable t) {
}
});
System.out.println(userList.getValue().size()); //here is userList is null
return userList;
}
}
As you can see in code the value of userList is not null when printed in onResponse method and when printed again before returning it the value becomes null. I don't understand why this is happening. I know this is some kind of programming mistake but I cannot figure it out. Can someone please help me?
