fr.eoidb.activity.fragment.LoaderFragment.java Source code

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Here is the source code for fr.eoidb.activity.fragment.LoaderFragment.java

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/**
 * Copyright (C) 2012 Picon software
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
    
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
package fr.eoidb.activity.fragment;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.Loader;

import fr.eoidb.EOIDBConst;

/**
 * @author picon.software
 *
 */
public abstract class LoaderFragment<D> extends AutoReloadOnPauseFragment implements LoaderCallbacks<D> {

    protected final static int LOADER_ID = EOIDBConst.getNextLoaderIdSequence();

    protected boolean firstLoad = true, isAttached = false, initRequested = false;

    /**
     *
     */
    public void initOrRestart() {
        if (isAttached) {
            if (firstLoad) {
                initLoader();
            } else {
                restartLoader();
            }
        } else {
            initRequested = true;
        }
    }

    /* (non-Javadoc)
     * @see android.support.v4.app.Fragment#onAttach(android.app.Activity)
     */
    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        isAttached = true;

        if (initRequested) {
            initOrRestart();
            initRequested = false;
        }
    }

    /* (non-Javadoc)
     * @see android.support.v4.app.Fragment#onDetach()
     */
    @Override
    public void onDetach() {
        super.onDetach();

        isAttached = false;
    }

    @Override
    protected void onReload() {
        super.onReload();

        initOrRestart();
    }

    public void initLoader() {
        getLoaderManager().initLoader(LOADER_ID, null, this);
        firstLoad = false;
    }

    public void initLoader(Bundle args) {
        getLoaderManager().initLoader(LOADER_ID, args, this);
        firstLoad = false;
    }

    public void restartLoader() {
        getLoaderManager().restartLoader(LOADER_ID, null, this);
    }

    @Override
    public void onPause() {
        super.onPause();

        getLoaderManager().destroyLoader(LOADER_ID);
        firstLoad = true;
    }

    @Override
    public final Loader<D> onCreateLoader(int id, Bundle args) {
        if (id == LOADER_ID)
            return getCursorLoader(id, args);
        return null;
    }

    protected abstract Loader<D> getCursorLoader(int id, Bundle args);

    @Override
    public void onLoadFinished(Loader<D> loader, D data) {
        if (loader.getId() == LOADER_ID) {
            onLoadFinished(data);
        }
    }

    protected void onLoadFinished(D data) {
    };
}