br.com.bioscada.apps.biotracks.SectionResourceCursorAdapter.java Source code

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Here is the source code for br.com.bioscada.apps.biotracks.SectionResourceCursorAdapter.java

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/*
 * Copyright 2013 Google Inc.
 *
 * 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 br.com.bioscada.apps.biotracks;

import android.content.Context;
import android.database.Cursor;
import android.support.v4.widget.ResourceCursorAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.google.android.lib.mytracks.content.TracksColumns;

/**
 * A section based resource cursor adapter. Currently only supports one
 * additional section header, "Shared with me".
 * 
 * @author Jimmy Shih
 */
public abstract class SectionResourceCursorAdapter extends ResourceCursorAdapter {

    private enum ItemType {
        TRACK, HEADER
    }

    private final LayoutInflater layoutInflater;
    private int sharedWithMeIndex = -1;

    public SectionResourceCursorAdapter(Context context, int layout, Cursor cursor, int flags) {
        super(context, layout, cursor, flags);
        this.layoutInflater = LayoutInflater.from(context);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (getItemViewType(position) == ItemType.TRACK.ordinal()) {
            return super.getView(getCursorPosition(position), convertView, parent);
        } else {
            TextView textView;
            if (convertView == null) {
                textView = (TextView) layoutInflater.inflate(R.layout.track_list_header, parent, false);
            } else {
                textView = (TextView) convertView;
            }
            return textView;
        }
    }

    @Override
    public int getViewTypeCount() {
        return ItemType.values().length;
    }

    @Override
    public int getCount() {
        int count = super.getCount();
        return count != 0 && sharedWithMeIndex != -1 ? count + 1 : count;
    }

    @Override
    public boolean isEnabled(int position) {
        return getItemViewType(position) == ItemType.TRACK.ordinal();
    }

    @Override
    public Object getItem(int position) {
        if (getItemViewType(position) == ItemType.TRACK.ordinal()) {
            return super.getItem(getCursorPosition(position));
        }
        return null;
    }

    @Override
    public long getItemId(int position) {
        if (getItemViewType(position) == ItemType.TRACK.ordinal()) {
            return super.getItemId(getCursorPosition(position));
        }
        return -1L;
    }

    @Override
    public int getItemViewType(int position) {
        if (sharedWithMeIndex != -1 && sharedWithMeIndex == position) {
            return ItemType.HEADER.ordinal();
        }
        return ItemType.TRACK.ordinal();
    }

    @Override
    public Cursor swapCursor(Cursor newCursor) {
        Cursor oldCursor = super.swapCursor(newCursor);
        sharedWithMeIndex = getSharedWithMeIndex();
        return oldCursor;
    }

    /**
     * Gets the Shared with me header index.
     */
    private int getSharedWithMeIndex() {
        int i = 0;
        Cursor cursor = getCursor();
        if (cursor != null && cursor.moveToFirst()) {
            int index = cursor.getColumnIndex(TracksColumns.SHAREDWITHME);
            do {
                int sharedWithMe = cursor.getInt(index);
                if (sharedWithMe == 1) {
                    // Returns the index where sharedWithMe == 1
                    return i;
                }
                i++;
            } while (cursor.moveToNext());
        }
        return -1;
    }

    /**
     * Gets the underlying cursor position.
     * 
     * @param position the requested position
     */
    private int getCursorPosition(int position) {
        if (sharedWithMeIndex != -1 && position > sharedWithMeIndex) {
            return position - 1;
        }
        return position;
    }
}