Wsrtjtyk

I am trying to write a game on android, text quest.

I have process called "work" what it does is giving player chance to choose work place and how much time he wants to work, then process this information.

Below is code of two methods "checkWorkPlaces()" that checks if there are places to work in the city player are in, and then it calls "chooseWorkPlace()" method, that gives player chance to choose where he wants to work.

• 
  tvInfo - TextView, I show all information on it.


• 
  player - object of my custom class Player, that has such property as location of custom class Place, that has property name and workPlaces - array that contains work places of class WorkPlace, every one of those has definition and name property.


• 
  answerContainer - just ArrayList that I use to pass some information between methods.


• 
  btnMainGame - actually just a Button, that I use to save user information


• 
  

  hideButtons() - hides some buttons on screen [not important for my question]

  
  
  

  protected void checkWorkPlaces() {
  
  
  
  answerContainer.clear();
  
  
  
  if (player.location.workPlaces.length > 0) {
  
  
  
      tvInfo.setText("In " + player.location.name + " there are a few places to work:");
  
  
  
      for (WorkPlace workPlace : player.location.workPlaces) {
  
          tvInfo.append("n" + workPlace.defenition);
  
      }
  
      tvInfo.append("Where do you want to work?");
  
  
  
      chooseWorkPlace();
  
  
  
  
  
  } else {
  
      tvInfo.setText("There is nowhere to work in " + player.location.name);
  
  }
  
  
  
  }
  
  
  
  
  
  protected void chooseWorkPlace() {
  
  
  
  hideButtons();
  
  
  
  btnMainGame.setText(getString(R.string.save));
  
  btnMainGame.setOnClickListener(new View.OnClickListener() {
  
      @Override
  
      public void onClick(View v) {
  
          if (etInput.getText().toString().isEmpty()){
  
              Toast.makeText(MainActivity.this, "Please enter something", Toast.LENGTH_SHORT).show();
  
              chooseWorkPlace();
  
  
  
          } else {
  
              answerContainer.add(etInput.getText().toString().toLowerCase());
  
  
  
          }
  
      }
  
  });
  
  
  
  String choice = answerContainer.get(0).toString().toLowerCase();
  
  answerContainer.clear();
  
  
  
  if (!Objects.equals(choice, "back")) {
  
  
  
      for (WorkPlace workPlace : player.location.workPlaces) {
  
  
  
          if (Objects.equals(workPlace.name.toLowerCase(), choice)) {
  
  
  
              answerContainer.add(workPlace);
  
              return;
  
          }
  
      }
  
  
  
      tvInfo.append("nnThere is no such work place as: " + choice + ", try again");
  
      chooseWorkPlace();
  
  
  
  }
  
  
  
  }
  
  

  
  

So, the problem is, that when program starts to call chooseWorkPlace() method it stops the program with java.lang.IndexOutOfBoundsException

E/AndroidRuntime: FATAL EXCEPTION: main

Process: com.example.griseostrigiformes.textwarrior, PID: 4916

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

    at java.util.ArrayList.get(ArrayList.java:437)

    at com.example.griseostrigiformes.textwarrior.MainSystem.MainActivity.chooseWorkPlace(MainActivity.java:521)

    at com.example.griseostrigiformes.textwarrior.MainSystem.MainActivity.checkWorkPlaces(MainActivity.java:492)

    at com.example.griseostrigiformes.textwarrior.MainSystem.MainActivity$2.onClick(MainActivity.java:124)

    at android.view.View.performClick(View.java:6256)

    at android.view.View$PerformClick.run(View.java:24701)

    at android.os.Handler.handleCallback(Handler.java:789)

    at android.os.Handler.dispatchMessage(Handler.java:98)

    at android.os.Looper.loop(Looper.java:164)

    at android.app.ActivityThread.main(ActivityThread.java:6541)

    at java.lang.reflect.Method.invoke(Native Method)

    at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)

    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

How can I fix this problem?

This line seems to be giving you the error,

String choice = answerContainer.get(0).toString().toLowerCase();

May be you should first check the size of answerContainer before getting element at zero index? OR you should debug why answerContainer is empty.