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I have two arrays, the first consists of 9 buttons. The second can hold 9 Strings. I have a method called getPlayerChoiceText to populate the String array with the text that is set on each button from the playerchoice Array. How can I save this text using SharedPreferences?

private String getPlayerChoiceText()

 playerchoiceText[0] = playerchoice[0].getText().toString();
 playerchoiceText[1] = playerchoice[1].getText().toString();
 playerchoiceText[2] = playerchoice[2].getText().toString();
 playerchoiceText[3] = playerchoice[3].getText().toString();
 playerchoiceText[4] = playerchoice[4].getText().toString();
 playerchoiceText[5] = playerchoice[5].getText().toString();
 playerchoiceText[6] = playerchoice[6].getText().toString();
 playerchoiceText[7] = playerchoice[7].getText().toString();
 playerchoiceText[8] = playerchoice[8].getText().toString();

 return playerchoiceText;


 private void saveData()
 
 SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREFS, MODE_PRIVATE);
 SharedPreferences.Editor editor = sharedPreferences.edit();
 playerchoiceText = getPlayerChoiceText();
 

I have got the same problem. I solved it by using JSONArray.

JSONArray choices = new JSONArray();
choices.put("1");
choices.put("2");
choices.put("3");

// Save
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREFS, MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("choices", choices.toString());

// Retrieve
choices = new JSONArray(sharedPreferences.getString("choices", ""));

In this way, you can easily do Insert and Delete operations. I hope this helps.

Android's SharedPreferences operates as a key value store, and does not allow you to directly store Java objects. So, representing your player choice text values as a map would make more sense, if you want to store them using shared preferences.

There is one trick you might be able to use here, if you wanted to continue representing your choice texts as an array. You could store the texts using a delimiter, e.g. pipe:

String choices = String.join("|", playerchoiceText);
SharedPreferences prefs = getSharedPreferences(YOUR_PREFS_KEY, Context.MODE_PRIVATE);
prefs.edit().putString("choices", choices).apply();

And then, on the way out:

SharedPreferences prefs = getSharedPreferences(YOUR_PREFS_KEY, Context.MODE_PRIVATE);
String playerchoiceText = prefs.getString("choices", "").split("\|");

Use put/getStringSet():

private void saveData()
 
 SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREFS, MODE_PRIVATE);
 SharedPreferences.Editor editor = sharedPreferences.edit();
 String playerchoiceText = getPlayerChoiceText();
 editor.putStringSet("player_choice", new HashSet<T>(Arrays.asList(playerchoiceText)); 
 editor.commit();