NavDrawerAdapter.java

/*
 * Copyright (C) 2014 barter.li
 *
 * 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 li.barter.adapters;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import li.barter.R;

/**
 * Adapter for adding items in the Navigration in the home screen
 *
 * @author Vinay S Shenoy
 */
public class NavDrawerAdapter extends BaseAdapter {

    private static final String TAG = "NavDrawerAdapter";

    /** View type for primary options */
    private static final int VIEW_PRIMARY = 0;

    /** View type for secondary options */
    private static final int VIEW_SECONDARY = 1;

    /**
     * Navigation Drawer primary options
     */
    private final String[] mNavDrawerPrimaryOptions;

    /**
     * Navigation Drawer secondary options
     */
    private final String[] mNavDrawerSecondaryOptions;

    /**
     * Layout Inflater for inflating layouts
     */
    private final LayoutInflater mLayoutInflater;


    /**
     * COnstruct the adapter for the Navigation drawer
     *
     * @param context                         {@link Context} reference
     * @param drawerItemPrimaryOptionsResId   The resource id of an aray that contains the strings
     *                                        of the titles in the nav drawer
     * @param drawerItemSecondaryOptionsResId The resource id of an array that contains the strings
     *                                        of the descriptions of the items in the navigation
     *                                        drawer
     */
    public NavDrawerAdapter(final Context context, final int drawerItemPrimaryOptionsResId, final int drawerItemSecondaryOptionsResId) {
        mLayoutInflater = LayoutInflater.from(context);
        mNavDrawerPrimaryOptions = context.getResources()
                                          .getStringArray(drawerItemPrimaryOptionsResId);
        mNavDrawerSecondaryOptions = context.getResources()
                                            .getStringArray(drawerItemSecondaryOptionsResId);
    }

    @Override
    public int getViewTypeCount() {
        return 2;
    }

    @Override
    public int getCount() {
        return mNavDrawerPrimaryOptions.length + mNavDrawerSecondaryOptions.length;
    }

    @Override
    public int getItemViewType(final int position) {

        if (position < mNavDrawerPrimaryOptions.length) {
            return VIEW_PRIMARY;
        } else if (position < (mNavDrawerPrimaryOptions.length + mNavDrawerSecondaryOptions.length)) {
            return VIEW_SECONDARY;
        } else {
            throw new IllegalStateException("Invalid position " + position);
        }
    }

    @Override
    public Object getItem(final int position) {
        final int viewType = getItemViewType(position);

        if (viewType == VIEW_PRIMARY) {
            return mNavDrawerPrimaryOptions[position];
        } else {
            return mNavDrawerSecondaryOptions[position - mNavDrawerPrimaryOptions.length];
        }
    }

    @Override
    public long getItemId(final int position) {
        return position;
    }

    @Override
    public View getView(final int position, final View convertView,
                        final ViewGroup parent) {

        final int viewType = getItemViewType(position);
        final String title = (String) getItem(position);

        View view = convertView;

        if (viewType == VIEW_PRIMARY) {

            if (view == null) {
                view = LayoutInflater.from(parent.getContext())
                                     .inflate(R.layout.layout_nav_drawer_item_primary, parent,
                                              false);
                view.setTag(R.id.text_nav_item_title, view
                        .findViewById(R.id.text_nav_item_title));
            }

            ((TextView) view.getTag(R.id.text_nav_item_title))
                    .setText(title);
        } else if (viewType == VIEW_SECONDARY) {
            if (view == null) {
                view = LayoutInflater.from(parent.getContext())
                                     .inflate(R.layout.layout_nav_drawer_item_secondary, parent,
                                              false);
                view.setTag(R.id.text_nav_item_title, view
                        .findViewById(R.id.text_nav_item_title));
            }

            ((TextView) view.getTag(R.id.text_nav_item_title))
                    .setText(title);
        }

        return view;
    }


}