edu.iit.cs442.team7.iitbazaar.fragments.RecyclerViewItemListFragment.java Source code

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Here is the source code for edu.iit.cs442.team7.iitbazaar.fragments.RecyclerViewItemListFragment.java

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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package edu.iit.cs442.team7.iitbazaar.fragments;

import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RadioButton;

import edu.iit.cs442.team7.iitbazaar.BazaarActivity;
import edu.iit.cs442.team7.iitbazaar.IITBazaar;
import edu.iit.cs442.team7.iitbazaar.ItemAdapter;
import edu.iit.cs442.team7.iitbazaar.R;
import edu.iit.cs442.team7.iitbazaar.database.DBController;

/**
 * @author <a href="mailto:jnosek@hawk.iit.edu">Janusz M. Nosek</a>
 */

public class RecyclerViewItemListFragment extends Fragment {

    private static final String TAG = "RecyclerViewItemListFragment";
    private static final String KEY_LAYOUT_MANAGER = "layoutManager";
    private static final int SPAN_COUNT = 20;
    private static final int DATASET_COUNT = 100;

    private BazaarActivity parentActivity;

    private enum LayoutManagerType {
        GRID_LAYOUT_MANAGER, LINEAR_LAYOUT_MANAGER
    }

    protected LayoutManagerType mCurrentLayoutManagerType;

    protected RecyclerView mRecyclerView;
    protected ItemAdapter mAdapter;
    protected RecyclerView.LayoutManager mLayoutManager;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.recycler_view_list_frag, container, false);
        rootView.setTag(TAG);

        // BEGIN_INCLUDE(initializeRecyclerView)
        mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerView);

        // LinearLayoutManager is used here, this will layout the elements in a similar fashion
        // to the way ListView would layout elements. The RecyclerView.LayoutManager defines how
        // elements are laid out.
        mLayoutManager = new LinearLayoutManager(getActivity());

        mCurrentLayoutManagerType = LayoutManagerType.LINEAR_LAYOUT_MANAGER;

        if (savedInstanceState != null) {
            // Restore saved layout manager type.
            mCurrentLayoutManagerType = (LayoutManagerType) savedInstanceState.getSerializable(KEY_LAYOUT_MANAGER);
        }
        setRecyclerViewLayoutManager(mCurrentLayoutManagerType);

        //mAdapter = new ItemAdapter(parentActivity,mDataset);

        Cursor mCursor = IITBazaar.getDBController().getCurrentItems();
        mCursor.moveToFirst();

        mAdapter = new ItemAdapter(parentActivity, mCursor);
        // Set ItemAdapter as the adapter for RecyclerView.
        mRecyclerView.setAdapter(mAdapter);
        // END_INCLUDE(initializeRecyclerView)

        DBController controller = IITBazaar.getDBController();
        parentActivity.registerDataChangeListeners(mAdapter);
        //this is an asynchronous callback
        controller.syncRemoteItems(parentActivity);

        return rootView;
    }

    /**
     * Set RecyclerView's LayoutManager to the one given.
     *
     * @param layoutManagerType Type of layout manager to switch to.
     */
    public void setRecyclerViewLayoutManager(LayoutManagerType layoutManagerType) {
        int scrollPosition = 0;

        // If a layout manager has already been set, get current scroll position.
        if (mRecyclerView.getLayoutManager() != null) {
            scrollPosition = ((LinearLayoutManager) mRecyclerView.getLayoutManager())
                    .findFirstCompletelyVisibleItemPosition();
        }

        switch (layoutManagerType) {
        case GRID_LAYOUT_MANAGER:
            mLayoutManager = new GridLayoutManager(getActivity(), SPAN_COUNT);
            mCurrentLayoutManagerType = LayoutManagerType.GRID_LAYOUT_MANAGER;
            break;
        case LINEAR_LAYOUT_MANAGER:
            mLayoutManager = new LinearLayoutManager(getActivity());
            mCurrentLayoutManagerType = LayoutManagerType.LINEAR_LAYOUT_MANAGER;
            break;
        default:
            mLayoutManager = new LinearLayoutManager(getActivity());
            mCurrentLayoutManagerType = LayoutManagerType.LINEAR_LAYOUT_MANAGER;
        }

        mRecyclerView.setLayoutManager(mLayoutManager);
        mRecyclerView.scrollToPosition(scrollPosition);
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        // Save currently selected layout manager.
        savedInstanceState.putSerializable(KEY_LAYOUT_MANAGER, mCurrentLayoutManagerType);
        super.onSaveInstanceState(savedInstanceState);
    }

    public void onAttach(Context context) {
        super.onAttach(context);

        if (context instanceof Activity) {
            parentActivity = (BazaarActivity) context;
            Log.d(this.getClass().getSimpleName(), "Activity context set correctly");
        } else {
            Log.e(this.getClass().getSimpleName(),
                    "Attached context of " + this.getClass().getSimpleName() + " is not of activity type.");
        }

    }

    /**
     * Generates Strings for RecyclerView's adapter. This data would usually come
     * from a local content provider or remote server.
     */
    /*private void initDataset() {
    mDataset = new String[DATASET_COUNT];
    for (int i = 0; i < DATASET_COUNT; i++) {
        mDataset[i] = "This is element #" + i;
    }
    }*/

}