com.kowd.pcapp.client.android.fragment.ProductItemsFragment.java Source code

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Here is the source code for com.kowd.pcapp.client.android.fragment.ProductItemsFragment.java

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/*
 * Copyright (C) 2012 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 com.kowd.pcapp.client.android.fragment;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.GridView;

import com.kowd.pcapp.client.android.R;
import com.kowd.pcapp.client.android.activity.ProductItemActivity;
import com.kowd.pcapp.client.android.adapter.ProductsGridViewAdapter;
import com.kowd.pcapp.client.android.constants.PCConstants;
import com.kowd.pcapp.client.android.constants.PCContentProviderConst;

public class ProductItemsFragment extends Fragment
        implements LoaderManager.LoaderCallbacks<Cursor>, AdapterView.OnItemClickListener {

    private ProductsGridViewAdapter mAdapter;
    private GridView mGridView;
    private int mColumnWidth;

    private int mCategoryId;

    public ProductItemsFragment(final int categoryId) {
        mCategoryId = categoryId;
    }

    @SuppressLint("InflateParams")
    @Override
    public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle bundle) {
        super.onCreateView(inflater, container, bundle);

        final View localView = inflater.inflate(R.layout.pc_products_list, container, false);

        if (null != bundle) {
            mCategoryId = bundle.getInt(PCConstants.CATEGORY_ID_KEY, -1);
        }

        initLoader(mCategoryId);

        mGridView = (GridView) localView.findViewById(R.id.pc_products_list);

        final DisplayMetrics localDisplayMetrics = new DisplayMetrics();
        getActivity().getWindowManager().getDefaultDisplay().getMetrics(localDisplayMetrics);

        final int pixelSize = getResources().getDimensionPixelSize(R.dimen.pc_thumb_size);
        final int widthScale = localDisplayMetrics.widthPixels / pixelSize;
        mColumnWidth = (localDisplayMetrics.widthPixels / widthScale);

        mAdapter = new ProductsGridViewAdapter(container.getContext(), mColumnWidth);
        mGridView.setColumnWidth(mColumnWidth);
        mGridView.setNumColumns(2);
        mGridView.setAdapter(mAdapter);

        mGridView.setOnItemClickListener(this);
        mGridView.setEmptyView(localView.findViewById(R.id.pc_products_progress_root));

        return localView;
    }

    public void initLoader(final int categoryId) {
        mCategoryId = categoryId;
        final Bundle categoryParam = new Bundle();
        categoryParam.putInt(PCConstants.CATEGORY_ID_KEY, categoryId);
        getLoaderManager().restartLoader(PCContentProviderConst.PRODUCTS_LOADER, categoryParam, this);
    }

    @Override
    public void onDestroyView() {
        mGridView = null;
        super.onDestroyView();
    }

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

    @Override
    public void onSaveInstanceState(final Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt(PCConstants.CATEGORY_ID_KEY, mCategoryId);
    }

    @Override
    public void onItemClick(final AdapterView<?> adapterView, final View view, final int viewId, final long rowId) {
        final Cursor cursor = (Cursor) mAdapter.getItem(viewId);
        final Bundle bundle = new Bundle();
        final int id = cursor.getInt(PCContentProviderConst.PRODUCTS_ID_CURSOR_INDEX);
        final String name = cursor.getString(PCContentProviderConst.PRODUCTS_NAME_CURSOR_INDEX);
        final String desc = cursor.getString(PCContentProviderConst.PRODUCTS_DESCRIPTION_CURSOR_INDEX);
        final String imgLoc = cursor.getString(PCContentProviderConst.PRODUCTS_IMAGE_LOC_CURSOR_INDEX);
        bundle.putInt(PCConstants.PRODUCTS_ID_KEY, id);
        bundle.putString(PCConstants.PRODUCTS_NAME_KEY, name);
        bundle.putString(PCConstants.PRODUCTS_DESC_KEY, desc);
        bundle.putString(PCConstants.PRODUCTS_IMAGE_LOC_KEY, imgLoc);

        final Intent viewProduct = ProductItemActivity.newInstance(getActivity(), bundle);
        startActivity(viewProduct);
    }

    @Override
    public Loader<Cursor> onCreateLoader(final int localView, final Bundle bundle) {
        switch (localView) {
        case PCContentProviderConst.PRODUCTS_LOADER:
            final int categoryId = bundle.getInt(PCConstants.CATEGORY_ID_KEY, -1);
            return new CursorLoader(getActivity(), // Context
                    PCContentProviderConst.PRODUCTS_TABLE_CONTENTURI, // Table to query
                    PCContentProviderConst.PRODUCTS_PROJECTION, // Projection to return
                    PCContentProviderConst.CATEGORY_ID + " = ?", // No selection clause
                    new String[] { String.valueOf(categoryId) }, // No selection arguments
                    PCContentProviderConst.ROW_ID + " ASC" // Default sort order
            );
        default:
            // An invalid id was passed in
            return null;
        }
    }

    @Override
    public void onLoadFinished(final Loader<Cursor> loader, final Cursor cursor) {
        mAdapter.changeCursor(cursor);
    }

    @Override
    public void onLoaderReset(final Loader<Cursor> loader) {
        mAdapter.changeCursor(null);
    }
}