Android Open Source - BBC-News-Reader Category Chooser Adapter

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License

The source code is released under:

Copyright (c) 2011, 2012, Digital Lizard (Oscar Key, Thomas Boby) All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the...

Java Source Code

package com.digitallizard.bbcnewsreader;
//from   w w w. ja va2s .  c  om
import java.util.ArrayList;
import java.util.Arrays;

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

public class CategoryChooserAdapter extends BaseAdapter implements ListAdapter {
  /* constants */
  //FIXME should be in xml
  private static final String ENABLED_HEADER_TEXT = "Enabled categories";
  private static final String DISABLED_HEADER_TEXT = "Disabled categories";
  private static final int VIEW_TYPE_COUNT = 2;
  private static final int VIEW_TYPE_HEADER = 0;
  private static final int VIEW_TYPE_CATEGORY = 1;
  
  /* variables */
  private LayoutInflater inflater;
  private ArrayList<String> items;
  private int enabledHeaderPosition, disabledHeaderPosition;
  
  public CategoryChooserAdapter(Context context, 
      String[] enabledCategories, String[] disabledCategories) {    
    inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    
    // build the items list
    this.items = new ArrayList<String>();
    items.add(ENABLED_HEADER_TEXT);
    items.addAll(Arrays.asList(enabledCategories));
    items.add(DISABLED_HEADER_TEXT);
    items.addAll(Arrays.asList(disabledCategories));
    updateHeaderPositions();
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    // determine if we should be returning a header or an actual item
    if(getItemViewType(position) == VIEW_TYPE_HEADER) {
      // init a new view if convert view is not of the correct type or is null
      if(convertView == null || convertView.getId() != R.id.categoryChooserHeaderItem) {
        convertView = inflater.inflate(R.layout.category_chooser_header_item, null);
      }
      
      TextView header = (TextView) convertView;
      if(position == enabledHeaderPosition) {
        // set the enabled header
        header.setText(ENABLED_HEADER_TEXT);
      }
      else if(position == disabledHeaderPosition) {
        // set the disabled header
        header.setText(DISABLED_HEADER_TEXT);
      }
      return header;
    }
    else {
      // return an actual item
      // init a new view if convert view is not of the correct type or is null
      if(convertView == null || convertView.getId() != R.id.categoryChooserSortableItem) {
        convertView = inflater.inflate(R.layout.category_chooser_sortable_item, null);
      }
      
      // set the item text and return it
      ((TextView) convertView.findViewById(R.id.categoryChooserItemText)).setText(getItem(position));
      return convertView;
    }
  }
  
  public void move(String item, int from, int to) {
    // check that the item is not being moved above the enabled header
    if(to <= enabledHeaderPosition) {
      to = enabledHeaderPosition + 1;
    }
    
    // remove the item and then insert it again
    items.remove(item);
    items.add(to, item);
    
    // notify the about the change
    updateHeaderPositions();
    notifyDataSetChanged();
  }

  @Override
  public int getCount() {
    return items.size();
  }

  @Override
  public String getItem(int position) {
    // return the item at this position
    return items.get(position);
  }

  @Override
  public long getItemId(int position) {
    // TODO Auto-generated method stub
    return 0;
  }

  public int getPosition(String item) {
    return items.indexOf(item);
  }

  @Override
  public int getItemViewType(int position) {
    // if the item is at 0 or the end of the first list it is a header
    if(position == enabledHeaderPosition || position == disabledHeaderPosition) {
      return VIEW_TYPE_HEADER;
    } else {
      // it's a category
      return VIEW_TYPE_CATEGORY;
    }
  }
  
  @Override
  public int getViewTypeCount() {
    // we have two types of view
    return VIEW_TYPE_COUNT;
  }

  public String[] getEnabledCategories() {
    // build an array of enabled categories
    ArrayList<String> categories = new ArrayList<String>();
    for(int i = (enabledHeaderPosition + 1); i < disabledHeaderPosition; i++) {
      categories.add(items.get(i));
    }
    return categories.toArray(new String[categories.size()]);
  }
  
  public String[] getDisabledCategories() {
    // build array of disabled categories
    ArrayList<String> categories = new ArrayList<String>();
    for(int i = (disabledHeaderPosition + 1); i < items.size(); i++) {
      categories.add(items.get(i));
    }
    return categories.toArray(new String[categories.size()]);
  }
  
  private void updateHeaderPositions() {
    enabledHeaderPosition = 0;
    disabledHeaderPosition = items.indexOf(DISABLED_HEADER_TEXT);
  }
}

Java Source Code List

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