Android Open Source - comicsapp Expandable Comic List Adapter

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Back to project page comicsapp.

License

The source code is released under:

GNU General Public License

Java Source Code

/* Copyright 2012-2014, Robert Myers */
/*  w ww .  ja v  a2 s. c  om*/
/*
 * This file is part of ComicsApp.

    ComicsApp 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.

    Comics 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 ComicsApp.  If not, see <http://www.gnu.org/licenses/>
 */
package com.robandjen.comicsapp;

import java.util.ArrayList;
import java.util.List;

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

public class ExpandableComicListAdapter extends BaseExpandableListAdapter {

  Context mContext;
  List<ComicsEntry> mComics;
  
  ExpandableComicListAdapter(Context ctx,List<ComicsEntry> comics) {
    mContext = ctx;
    mComics = comics;
    updateIndex();
  }
  
  static class CategoryIndexEntry {
    String mCategory;
    int mOffset;
    int mSize = 0;
    
    public CategoryIndexEntry(String category,int offset) {
      mCategory = category;
      mOffset = offset;
    }
    
    public void setSize(int size) {
      mSize = size;
    }
    
    public String getCategory() {
      return mCategory;
    }
    
    public int getOffset() {
      return mOffset;
    }
    
    public int getSize() { 
      return mSize;
    }
    
    @Override
    public String toString() {
      return mCategory;
    }

    @Override
    public boolean equals(Object obj) {
      if (this == obj)
        return true;
      if (obj == null)
        return false;
      if (getClass() != obj.getClass())
        return false;
      CategoryIndexEntry other = (CategoryIndexEntry) obj;
      if (mCategory == null) {
        if (other.mCategory != null)
          return false;
      } else if (!mCategory.equals(other.mCategory))
        return false;
      if (mOffset != other.mOffset)
        return false;
      if (mSize != other.mSize)
        return false;
      return true;
    }

    @Override
    public int hashCode() {
      final int prime = 31;
      int result = 1;
      result = prime * result
          + ((mCategory == null) ? 0 : mCategory.hashCode());
      result = prime * result + mOffset;
      result = prime * result + mSize;
      return result;
    }
  }
  
  List<CategoryIndexEntry> mCategoryIndex = new ArrayList<CategoryIndexEntry>();
  
  static boolean categoryEquals(String lhs,String rhs) {
    if (lhs != null) {
      return lhs.equals(rhs);
    }
    
    return rhs == null;
  }
  
  void updateIndex() {
    mCategoryIndex.clear();
    if (mComics == null || mComics.size() == 0) {
      return;
    }
    
    String curCategory = mComics.get(0).getCategory();
    CategoryIndexEntry curEntry = new CategoryIndexEntry(curCategory,0);
    int curIdx = 1;
    int size = mComics.size();
    for (curIdx = 1; curIdx < size; ++curIdx) {
      ComicsEntry ce = mComics.get(curIdx);
      String nextCategory = ce.getCategory();
      if (!categoryEquals(curCategory,nextCategory)) {
        curEntry.setSize(curIdx - curEntry.getOffset());
        mCategoryIndex.add(curEntry);
        curCategory = nextCategory;
        curEntry = new CategoryIndexEntry(curCategory,curIdx);
      }
    }
    
    curEntry.setSize(curIdx - curEntry.getOffset());
    mCategoryIndex.add(curEntry);
  }
  
  @Override
  public Object getChild(int groupPos, int childPos) {
    return mComics.get(mCategoryIndex.get(groupPos).getOffset() + childPos);
  }

  @Override
  public View getChildView(int groupPos, int childPos, boolean isLastChild, View convertView,
      ViewGroup parent) {
    if (convertView == null) {
      convertView = LayoutInflater.from(mContext).inflate(R.layout.comic_view, parent,false);
    }
    
    TextView tv = (TextView) convertView;
    tv.setText(getChild(groupPos, childPos).toString());
    return convertView;
  }

  @Override
  public int getChildrenCount(int groupPos) {
    return mCategoryIndex.get(groupPos).getSize();
  }

  @Override
  public Object getGroup(int groupPos) {
    return mCategoryIndex.get(groupPos);
  }

  @Override
  public int getGroupCount() {
    return mCategoryIndex.size();
  }

  @Override
  public long getGroupId(int groupPos) {
    return groupPos;
  }

  @Override
  public View getGroupView(int groupPos, boolean isExpanded, View convertView, ViewGroup parent) {
    if (convertView == null) {
      convertView = LayoutInflater.from(mContext).inflate(R.layout.group_view,parent,false);
    }
    
    TextView tv = (TextView) convertView;
    tv.setText(getGroup(groupPos).toString());
    return convertView;
  }

  @Override
  public boolean hasStableIds() {
    return false;
  }

  @Override
  public boolean isChildSelectable(int groupPos, int childPos) {
    return true;
  }

  @Override
  public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
  }
  
  public int childToComicsPos(int groupPos,int childPos) {
    return mCategoryIndex.get(groupPos).getOffset() + childPos;
  }
  
  public long comicsPosToPackedPos(int comicsPos) {
    int groupPos = 0;
    int childPos = -1;
    
    for (CategoryIndexEntry cie : mCategoryIndex) {
      final int offset = cie.getOffset();
      if (comicsPos >= offset && comicsPos < offset + cie.getSize()) {
        childPos = comicsPos - offset;
        break;
      }
      ++groupPos;
    }
    
    if (childPos == -1) {
      throw new IndexOutOfBoundsException();
    }
    
    return ExpandableListView.getPackedPositionForChild(groupPos, childPos);
  }
}

Java Source Code List

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