Saving Serializable Objects List into sharedPreferences

Question

Can anyone tell me how I can save a list of custom Serializable objects into SharedPreference? I am new To Android and I want to save an Arr

Answer 1

try this, works for me :

implementation 'com.google.code.gson:gson:2.7'

DataList.java :

import java.util.List;

public class DataList {
    List dataList;

    public List getDataList() {
        return dataList;
    }

    public void setDataList(List dataList) {
        this.dataList = dataList;
    }
}

MainActivity.java :

    List fetchLog = new ArrayList();
    DataList dataList = null;


    dataList = new DataList();
    Gson gson = new Gson();

    //SAVE List As SharedPreferences
    Data data = new Data("ali",20);
    fetchLog.add(data);
    dataList.setDataList(fetchLog);
    Gson gson = new Gson();
    String json = gson.toJson(dataList);
    
    utils.setPref("logs", json);// function to set SharedPreferences


    // read List from SharedPreferences
        String json = utils.getPref("logs");// function to read SharedPreferences
        if (! json.equals("")) {
            dataList = gson.fromJson(json, DataList.class);
            fetchLog = dataList.getDataList();
        }