BaseFragment.java

/*
 * This program is part of the OpenLMIS logistics management information
 * system platform software.
 *
 * Copyright © 2015 ThoughtWorks, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version. This program is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details. You should
 * have received a copy of the GNU Affero General Public License along with
 * this program. If not, see http://www.gnu.org/licenses. For additional
 * information contact info@OpenLMIS.org
 */

package org.openlmis.core.view.fragment;

import android.os.Bundle;

import org.openlmis.core.exceptions.ViewNotMatchException;
import org.openlmis.core.presenter.DummyPresenter;
import org.openlmis.core.presenter.Presenter;
import org.openlmis.core.utils.ToastUtil;
import org.openlmis.core.view.BaseView;
import org.openlmis.core.view.activity.BaseActivity;

import java.util.ArrayList;
import java.util.List;

import roboguice.fragment.provided.RoboFragment;
import rx.Subscription;


public abstract class BaseFragment extends RoboFragment implements BaseView {

    protected boolean isSavedInstanceState;
    protected Presenter presenter;
    protected List<Subscription> subscriptions = new ArrayList<>();

    /*
    * Life cycle of Fragment: onAttach -> onCreate -> onCreateView -> onViewCreated -> onActivityCreated -> onPause -> onStop
    * */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // retain this fragment
        setRetainInstance(true);
        isSavedInstanceState = false;

        setPresenter();
        attachPresenterView();
    }

    private void setPresenter() {
        presenter = initPresenter();
        if (presenter == null) {
            presenter = new DummyPresenter();
        }
    }

    private void attachPresenterView() {
        try {
            presenter.attachView(this);
        } catch (ViewNotMatchException e) {
            e.reportToFabric();
            ToastUtil.show(e.getMessage());
        }
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        isSavedInstanceState = true;
        super.onSaveInstanceState(outState);
    }

    public abstract Presenter initPresenter();

    @Override
    public void onStart() {
        super.onStart();
        presenter.onStart();
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        presenter.onStop();
    }

    @Override
    public void loading() {
        if (getActivity() instanceof BaseActivity) {
            ((BaseActivity) getActivity()).loading();
        }
    }

    @Override
    public void loading(String message) {
        if (getActivity() instanceof BaseActivity) {
            ((BaseActivity) getActivity()).loading(message);
        }
    }

    @Override
    public void loaded() {
        if (getActivity() instanceof BaseActivity) {
            ((BaseActivity) getActivity()).loaded();
        }
    }

    protected void hideImm() {
        if (getActivity() instanceof BaseActivity) {
            ((BaseActivity) getActivity()).hideImm();
        }
    }

    @Override
    public void onDestroy() {
        unSubscribeSubscriptions();
        super.onDestroy();
    }

    private void unSubscribeSubscriptions() {
        for (Subscription subscription : subscriptions) {
            if (subscription != null) {
                subscription.unsubscribe();
            }
        }
    }
}