hu.balazsbakai.sq.ui.fragments.PagerFragment.java Source code

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Here is the source code for hu.balazsbakai.sq.ui.fragments.PagerFragment.java

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/*
 * sonar-android-application
 * Copyright (C) 2013 Balzs Bakai
 * mailto:bakaibalazs AT gmail DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02
 */

package hu.balazsbakai.sq.ui.fragments;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RelativeLayout;
import hu.balazsbakai.sq.R;
import hu.balazsbakai.sq.pojo.Server;
import hu.balazsbakai.sq.util.LogUtil;
import hu.balazsbakai.sq.util.UsedServersUtil;

import java.util.List;

public abstract class PagerFragment extends Fragment {

    private int layoutId;
    private int listViewId;
    private int emptyListViewId;
    private int loadingId;
    private int noConnectionId;

    protected Server sonarQubeServer;
    protected ListView listView;
    protected boolean isConnectedToTheNetwork = true;
    protected boolean isRead = false;

    protected abstract List processJsonData(String data);

    protected abstract List getDataObject();

    protected abstract void setDataObject(List dataObject);

    protected abstract void addItemsToListAdapter();

    protected abstract boolean getData();

    protected void initResources(int layoutId, int listViewId, int emptyListViewId, int loadingId,
            int noConnectionId) {
        this.layoutId = layoutId;
        this.listViewId = listViewId;
        this.emptyListViewId = emptyListViewId;
        this.loadingId = loadingId;
        this.noConnectionId = noConnectionId;

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        LogUtil.d(getClass().getSimpleName(), "onCreateView");

        if (container == null) {
            return null;
        }
        setHasOptionsMenu(true);
        View rootView = inflater.inflate(layoutId, container, false);

        return rootView;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        LogUtil.d(getClass().getSimpleName(), "onOptionsItemSelected");

        switch (item.getItemId()) {
        case R.id.action_refresh:
            if (listView != null) {
                showLoadingLayout();
                readData();
            }
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }

    @Override
    public void onResume() {
        LogUtil.d(getClass().getSimpleName(), "onResume");
        super.onResume();

        listView = (ListView) getActivity().findViewById(listViewId);
        listView.setEmptyView(getActivity().findViewById(emptyListViewId));

        if (sonarQubeServer == null || getDataObject() == null) {
            readData();
        } else if (!isCurrentAndPreviousLastUsedDisplayNameEquals()) {
            isRead = false;
            readData();
        } else if (isConnectedToTheNetwork) {
            populateListAdapter();
        } else if (!isConnectedToTheNetwork) {
            showNoConnectionLayout();
        }
    }

    private void readData() {
        LogUtil.d(getClass().getSimpleName(), "readData");

        sonarQubeServer = UsedServersUtil.getUsedServers(getActivity()).getLastUsedServer();
        if (sonarQubeServer != null) {
            if (!isRead) {
                isRead = true;
                isConnectedToTheNetwork = getData();
            }
            if (!isConnectedToTheNetwork) {
                isRead = false;
                showNoConnectionLayout();
            }
        } else {
            showEmptyListView();
        }
    }

    protected Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            LogUtil.d(getClass().getSimpleName(), "handleMessage");
            isRead = false;

            // the asynch answer is belongs to an older server, so we van discard it
            if (!msg.getData().getString("displayName")
                    .equals(UsedServersUtil.getUsedServers(getActivity()).getLastUsedDisplayName())) {
                return;
            }

            if (msg.obj != null) {
                setDataObject(processJsonData(msg.obj.toString()));

                try {
                    populateListAdapter();
                } catch (Exception e) {
                    LogUtil.e("activity is closed, but a refresh action has not finished yet", e);
                }
            } else {
                setDataObject(null);
                showEmptyListView();
            }
        }
    };

    private void populateListAdapter() {
        LogUtil.d(getClass().getSimpleName(), "populateListAdapter");

        if (listView != null && getDataObject() != null) {
            if (getDataObject().size() == 0) {
                showEmptyListView();
            } else {
                addItemsToListAdapter();
                showPopulatedListView();
            }
        }
    }

    protected boolean isCurrentAndPreviousLastUsedDisplayNameEquals() {
        return UsedServersUtil.getUsedServers(getActivity()).getLastUsedDisplayName()
                .equals(sonarQubeServer.getDisplayName());
    }

    protected void showNoConnectionLayout() {
        getActivity().findViewById(loadingId).setVisibility(View.GONE);
        getActivity().findViewById(emptyListViewId).setVisibility(View.GONE);
        getActivity().findViewById(noConnectionId).setVisibility(View.VISIBLE);
    }

    protected void showPopulatedListView() {
        listView.setVisibility(View.VISIBLE);
        RelativeLayout r = (RelativeLayout) getActivity().findViewById(loadingId);
        if (r != null)
            r.setVisibility(View.GONE);
    }

    protected void showLoadingLayout() {
        listView.setVisibility(View.GONE);

        RelativeLayout l = (RelativeLayout) getActivity().findViewById(loadingId);
        if (l != null)
            l.setVisibility(View.VISIBLE);
    }

    protected void showEmptyListView() {
        RelativeLayout r = (RelativeLayout) getActivity().findViewById(loadingId);
        if (r != null)
            r.setVisibility(View.GONE);

        LinearLayout ll = (LinearLayout) getActivity().findViewById(emptyListViewId);
        if (ll != null)
            ll.setVisibility(View.VISIBLE);
    }

}