simonlang.coastdove.core.ui.LoadableListFragment.java Source code

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Here is the source code for simonlang.coastdove.core.ui.LoadableListFragment.java

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/*  Coast Dove
Copyright (C) 2016  Simon Lang
Contact: simon.lang7 at gmail dot com
    
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 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 General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package simonlang.coastdove.core.ui;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.ListFragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.Loader;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.ProgressBar;

import java.util.ArrayList;

import simonlang.coastdove.core.R;

/**
 * ListFragment that displays a progress bar while loading its contents
 */
public abstract class LoadableListFragment<T> extends ListFragment
        implements LoaderManager.LoaderCallbacks<ArrayList<T>> {

    /** Adapter to be used for the list view */
    protected ArrayAdapter<T> adapter;

    protected ProgressBar progressBar;

    protected int loaderID;

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        this.loaderID = 0;

        // Progress bar while the list loads
        this.progressBar = new ProgressBar(getActivity());
        this.progressBar.setVisibility(View.VISIBLE);
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        layoutParams.gravity = Gravity.CENTER;
        layoutParams.weight = 2;
        this.progressBar.setLayoutParams(layoutParams);
        this.progressBar.setIndeterminate(true);

        setUpListAdapter();

        getListView().setEmptyView(this.progressBar);
        addProgressBarToViewGroup();

        getLoaderManager().initLoader(loaderID, null, this);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_simple_list, container, false);
    }

    @Override
    public void onLoadFinished(Loader<ArrayList<T>> loader, ArrayList<T> data) {
        this.adapter.clear();
        this.adapter.addAll(data);
        this.progressBar.setVisibility(View.GONE);
    }

    @Override
    public void onLoaderReset(Loader<ArrayList<T>> loader) {
    }

    protected abstract void setUpListAdapter();

    protected abstract void addProgressBarToViewGroup();
}