How to retrieve Android Sqlite database in Arraylist

I have following code & want all the data in arraylist comes from sqlite database

 import android.app.Activity;

import android.database.sqlite.SQLiteDatabase;

import java.util.ArrayList; import java.util.HashMap;

public class DataSingleton extends Activity {

SQLiteDatabase db;

public ArrayList array;

private static DataSingleton dataSingleton;

public static DataSingleton getInstance() {
    if (dataSingleton == null) {
        dataSingleton = new DataSingleton();
    }
    return dataSingleton;
}

public ArrayList<String> visibleSections;

public HashMap<String, ArrayList<DataModel>> getDataList() {

    HashMap<String, ArrayList<DataModel>> dataList = new HashMap<>();

    ArrayList<DataModel> dataModelListWhoWeAre = new ArrayList<>();

    for (int i = 1; i <= 1; i++) {

        dataModelListWhoWeAre.add(new DataModel("About project Nanhikali ", R.drawable.abtprojectnanhikali));
        dataModelListWhoWeAre.add(new DataModel("Why support project NanhiKali ", R.drawable.whysupportnanhikali));
        dataModelListWhoWeAre.add(new DataModel("Managing Partner ", R.drawable.managingpartner));
        dataModelListWhoWeAre.add(new DataModel("Implementing NGO partners ", R.drawable.anandmahindrainthenews));
        dataModelListWhoWeAre.add(new DataModel("Our Supporters ", R.drawable.newsletter));
        dataModelListWhoWeAre.add(new DataModel("our Team ", R.drawable.annualreport));
        dataModelListWhoWeAre.add(new DataModel("Milestones ", R.drawable.successstories1));
        dataModelListWhoWeAre.add(new DataModel("Project Nanhikali in USA ", R.drawable.sponsoragirl));
        dataModelListWhoWeAre.add(new DataModel("Project Nanhikali in UK ", R.drawable.sponsoragirluk));
        dataModelListWhoWeAre.add(new DataModel("Annual Reports ", R.drawable.testimonials));
        dataModelListWhoWeAre.add(new DataModel("Newsletter ", R.drawable.initiative));
        dataModelListWhoWeAre.add(new DataModel("Trustees ", R.drawable.managingpartner));
    }
    dataList.put("Who We Are", dataModelListWhoWeAre);

    ArrayList<DataModel> dataModelProjectDo = new ArrayList<>();
    for (int i = 1; i <= 1; i++) {
        dataModelProjectDo.add(new DataModel("Initiatives & Activities ", R.drawable.initiative));
        dataModelProjectDo.add(new DataModel("Reach", R.drawable.reach));
        dataModelProjectDo.add(new DataModel("Success Stories ", R.drawable.successstories1));
        dataModelProjectDo.add(new DataModel("Testimonials ", R.drawable.testimonials));
        dataModelProjectDo.add(new DataModel("Donate ", R.drawable.sponsoragirl));

    }
         dataList.put("What We Do", dataModelProjectDo);

    ArrayList<DataModel> dataModelProjectHelp = new ArrayList<>();
    for (int i = 1; i <= 1; i++) {
        dataModelProjectHelp.add(new DataModel("Get Involved ", R.drawable.sponsoragirluk));
        dataModelProjectHelp.add(new DataModel("Corporate Social Responsibility ", R.drawable.sponsoragirluk));
        dataModelProjectHelp.add(new DataModel("Donate ", R.drawable.sponsoragirluk));

    }
         dataList.put("How Can You Help", dataModelProjectHelp);

    ArrayList<DataModel> dataModelProjectLook = new ArrayList<>();
    for (int i = 1; i <= 1; i++) {
        dataModelProjectLook.add(new DataModel("Photo gallery ", R.drawable.sponsoragirl));
        dataModelProjectLook.add(new DataModel("Video Gallery ", R.drawable.sponsoragirluk));
        dataModelProjectLook.add(new DataModel("Wallpapers ", R.drawable.abtprojectnanhikali));
        dataModelProjectLook.add(new DataModel("Posters ", R.drawable.successstories1));
    }
        dataList.put("Take a Look", dataModelProjectLook);
    ArrayList<DataModel> dataModelProjectNews = new ArrayList<>();
    for (int i = 1; i <= 1; i++) {
        dataModelProjectNews.add(new DataModel("News & Events ", R.drawable.sponsoragirluk));
        dataModelProjectNews.add(new DataModel("News ", R.drawable.sponsoragirluk));
        dataModelProjectNews.add(new DataModel("Events ", R.drawable.sponsoragirluk));
    }
        dataList.put("In The News", dataModelProjectNews);

    ArrayList<DataModel> dataModelProjectTouch = new ArrayList<>();
    for (int i = 1; i <= 1; i++) {
        dataModelProjectTouch.add(new DataModel("facebook ", R.drawable.sponsoragirl));
        dataModelProjectTouch.add(new DataModel("Twitter ", R.drawable.sponsoragirluk));
        dataModelProjectTouch.add(new DataModel("Linkedln ", R.drawable.sponsoragirl));
        dataModelProjectTouch.add(new DataModel("Whatsapp ", R.drawable.sponsoragirluk));
    }
        dataList.put("Get In Touch", dataModelProjectTouch);
    return dataList;
}

public ArrayList<String> getSectionTitles() {
    return array;
}
public DataSingleton()  {

visibleSections = new ArrayList<>();

visibleSections.add("Who We Are");
visibleSections.add("What We Do");
visibleSections.add("How Can You Help");
visibleSections.add("Take a Look");
visibleSections.add("In The News");
visibleSections.add("Get In Touch");
}

}