pass array of model objects to Fragment

Question

My app is receiving json from server and based on that I'm creating models using gson library from google (json string mapped directly to java object representation). Then I need to pass few of the same models in array to the Fragment to create view out of that. How can I achieve it since Fragments have static constructor and arguments can be passed via Bundle object. This is very simple model which will be passed in array with another:

public class SingleHomeCardItem {
    private String title;
    private String subtitle;
    private String badgeNumber;
    private String backgroundUrl;
    private String backgroundGradient;
    private String targetUrl;
    private String target;
    private String row;

    public String getTitle() {
        return title;
    }

    public String getSubtitle() {
        return subtitle;
    }

    public String getBadgeNumber() {
        return badgeNumber;
    }

    public String getBackgroundUrl() {
        return backgroundUrl;
    }

    public String getBackgroundGradient() {
        return backgroundGradient;
    }

    public String getTargetUrl() {
        return targetUrl;
    }

    public String getTarget() {
        return target;
    }

    public String getRow() {
        return row;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public void setSubtitle(String subtitle) {
        this.subtitle = subtitle;
    }

    public void setBadgeNumber(String badgeNumber) {
        this.badgeNumber = badgeNumber;
    }

    public void setBackgroundUrl(String backgroundUrl) {
        this.backgroundUrl = backgroundUrl;
    }

    public void setBackgroundGradient(String backgroundGradient) {
        this.backgroundGradient = backgroundGradient;
    }

    public void setTargetUrl(String targetUrl) {
        this.targetUrl = targetUrl;
    }

    public void setTarget(String target) {
        this.target = target;
    }

    public void setRow(String row) {
        this.row = row;
    }
}

And here's the fragment that I want to receive the array of that models and process it to create view:

public class HomeshelfFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = createView(inflater, container, getArguments().????);
        return v;
    }

    public static HomeshelfFragment newInstance(SingleHomeCardItem[] items) {

        HomeshelfFragment f = new HomeshelfFragment();
        Bundle b = new Bundle();
        // ?????
        f.setArguments(b);

        return f;
    }

    private View createView(LayoutInflater inflater, ViewGroup container, SingleHomeCardItem[] items) {
        View v = inflater.inflate(R.layout.home_card_3_items, container, false);
        // add views to the inflated view based on models data
        return v;
    }

}

What is the best approach to that problem? Thanks in advance!

score 2 · Accepted Answer · edited May 23 '17 at 10:26

Solution 1

instead transforming the Json Objects to java classes you can create Json objects that can hold your data. Hence u can pass your data like strings through activities and fragments

public class SingleHomeCardItem extends JSONObject {
private static final String TAG = SingleHomeCardItem.class.getSimpleName();

public static final String subtitle = "subtitle";
public static final String badgeNumber = "badgeNumber";
public static final String backgroundUrl = "backgroundUrl";
public static final String backgroundGradient = "backgroundGradient";
public static final String targetUrl = "targetUrl";
public static final String target = "target";
public static final String row = "row";

public SingleHomeCardItem(String json) throws JSONException {
    super(json);
}

public SingleHomeCardItem(JSONObject json) throws JSONException {
    super(json.toString());
}

public String getSubtitle() {
    return optString(subtitle, "");
}

public String getBadgeNumber() {
    return optString(badgeNumber, "");
}

public String getBackgroundUrl() {
    return optString(backgroundUrl, "");
}

public String getBackgroundGradient() {
    return optString(backgroundGradient, "");
}

public String getTargetUrl() {
    return optString(targetUrl, "");
}

public String getTarget() {
    return optString(target, "");
}
public String getRow() {
    return optString(row, "");
}
}

after that you can create more complex class that contatins a list of SingleHomeCardItem instances

public class AccountData extends JSONObject {

  private static final String TAG=AccountData.class.getSimpleName();

  private static final String ACOUNT_CARDS="SingleHomeCardItemList";

  public AccountData(String json) throws JSONException {
        super(json);
        }

        public AccountData(JSONObject json) throws JSONException {
            super(json.toString());
        }

        public ArrayList<SingleHomeCardItem> getAcountCards() throws JSONException {

            ArrayList<SingleHomeCardItem> cardsArray = new ArrayList<SingleHomeCardItem>();
            JSONArray cardsJSONArray = optJSONArray(ACOUNT_CARDS);


            if(!optString(ACOUNT_CARDS).equals("null")){
                 for(int i=0; i<cardsJSONArray.length(); i++) {
                        cardsArray.add(new          SingleHomeCardItem(cardsJSONArray.getString(i)));
                        }
            }

            return cardsArray;
            }

So you can pass the data like Strings

public class HomeshelfFragment extends Fragment {

public static final String KEY_DATA = "KEY_DATA";
private ArrayList<SingleHomeCardItem> myCards;



public static HomeshelfFragment newInstance(String data) {

    HomeshelfFragment f = new HomeshelfFragment();
    Bundle b = new Bundle();
    b.putString(KEY_DATA, data);
    f.setArguments(b);

    return f;
}

private View createView(LayoutInflater inflater, ViewGroup container, SingleHomeCardItem[] items) {
        View v = inflater.inflate(<your layout>, container, false);

        String dataString = this.getArguments().getString(KEY_DATA, "");

    AccountData data = null;

        myCards = new ArrayList<SingleHomeCardItem>();
    try {
        data = new AccountData(datastring);
    } catch (JSONException e) {

        e.printStackTrace();
    }


    try {
                  // a list with your SingleHomeCardItem instances
        myCards = data.getAcountCards();

    } catch (JSONException e) {

        e.printStackTrace();
    }
         // add views to the inflated view based on models data
    return v;
}

}

Solution 2

create an AcountCards class but without extending the JsonObject but implementing the Parcable interface and use getParcelableExtra() like this

Solution 3

create an AcountCards class but without extending the JsonObject but implementing the Serialiazible interface and use getSerializableExtra() like this

pass array of model objects to Fragment

1 Answers1