Android Open Source - TimeTabler Simple Sectioned List Adapter

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2013 Ian Kavanagh/*w w  w .  j a  va  2  s .  com*/
 * Copyright 2012 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 ie.clashoftheash.timetabler.ui.widget;

import ie.clashoftheash.timetabler.R;

import java.util.Arrays;
import java.util.Comparator;

import android.content.Context;
import android.database.DataSetObserver;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class SimpleSectionedListAdapter extends BaseAdapter {
  private boolean mValid = true;
  private int mSectionResourceId;
  private int[] mTo;
  private final LayoutInflater mLayoutInflater;
  private ListAdapter mBaseAdapter;
  private SparseArray<Section> mSections = new SparseArray<Section>();

  public static class Section {
    private int firstPosition;
    private int sectionedPosition;
    private String[] text;
    private boolean showOverlay;

    public Section(int firstPosition, String[] text, boolean showOverlay) {
      this.firstPosition = firstPosition;
      this.text = text;
      this.showOverlay = showOverlay;
    }

  }

  public SimpleSectionedListAdapter(Context context, int sectionResourceId,
      int[] to, ListAdapter baseAdapter) {
    mLayoutInflater = (LayoutInflater) context
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    mSectionResourceId = sectionResourceId;
    mTo = to;
    mBaseAdapter = baseAdapter;
    mBaseAdapter.registerDataSetObserver(new DataSetObserver() {
      @Override
      public void onChanged() {
        mValid = !mBaseAdapter.isEmpty();
        notifyDataSetChanged();
      }

      @Override
      public void onInvalidated() {
        mValid = false;
        notifyDataSetInvalidated();
      }
    });
  }

  public void setSections(Section[] sections) {
    mSections.clear();

    Arrays.sort(sections, new Comparator<Section>() {
      @Override
      public int compare(Section o, Section o1) {
        return (o.firstPosition == o1.firstPosition) ? 0
            : ((o.firstPosition < o1.firstPosition) ? -1 : 1);
      }
    });

    int offset = 0; // offset positions for the headers we're adding
    for (Section section : sections) {
      section.sectionedPosition = section.firstPosition + offset;
      mSections.append(section.sectionedPosition, section);
      ++offset;
    }

    notifyDataSetChanged();
  }

  public int positionToSectionedPosition(int position) {
    int offset = 0;
    for (int i = 0; i < mSections.size(); i++) {
      if (mSections.valueAt(i).firstPosition > position) {
        break;
      }
      ++offset;
    }
    return position + offset;
  }

  public int sectionedPositionToPosition(int sectionedPosition) {
    if (isSectionHeaderPosition(sectionedPosition)) {
      return ListView.INVALID_POSITION;
    }

    int offset = 0;
    for (int i = 0; i < mSections.size(); i++) {
      if (mSections.valueAt(i).sectionedPosition > sectionedPosition) {
        break;
      }
      --offset;
    }
    return sectionedPosition + offset;
  }

  public boolean isSectionHeaderPosition(int position) {
    return mSections.get(position) != null;
  }

  @Override
  public int getCount() {
    return (mValid ? mBaseAdapter.getCount() + mSections.size() : 0);
  }

  @Override
  public Object getItem(int position) {
    return isSectionHeaderPosition(position) ? mSections.get(position)
        : mBaseAdapter.getItem(sectionedPositionToPosition(position));
  }

  @Override
  public long getItemId(int position) {
    return isSectionHeaderPosition(position) ? Integer.MAX_VALUE
        - mSections.indexOfKey(position) : mBaseAdapter
        .getItemId(sectionedPositionToPosition(position));
  }

  @Override
  public int getItemViewType(int position) {
    return isSectionHeaderPosition(position) ? getViewTypeCount() - 1
        : mBaseAdapter.getItemViewType(position);
  }

  @Override
  public boolean isEnabled(int position) {
    // noinspection SimplifiableConditionalExpression
    return isSectionHeaderPosition(position) ? false : mBaseAdapter
        .isEnabled(sectionedPositionToPosition(position));
  }

  @Override
  public int getViewTypeCount() {
    return mBaseAdapter.getViewTypeCount() + 1; // the section headings
  }

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

  @Override
  public boolean hasStableIds() {
    return mBaseAdapter.hasStableIds();
  }

  @Override
  public boolean isEmpty() {
    return mBaseAdapter.isEmpty();
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    if (isSectionHeaderPosition(position)) {
      ViewGroup view = (ViewGroup) convertView;
      if (view == null) {
        view = (ViewGroup) mLayoutInflater.inflate(mSectionResourceId,
            parent, false);
      }

      int count = mTo.length;
      for (int i = 0; i < count; i++) {
        View v = view.findViewById(mTo[i]);
        if (v != null) {
          String text = mSections.get(position).text[i];
          if (text == null)
            text = "";

          if (v instanceof TextView)
            setViewText((TextView) v, text);
          else
            throw new IllegalStateException(
                v.getClass().getName()
                    + " is not a "
                    + " view that can be bound by this SimpleSectionedListAdapter");

        }
      }

      if (mSections.get(position).showOverlay)
        view.findViewById(R.id.overlay).setVisibility(View.VISIBLE);
      else
        view.findViewById(R.id.overlay).setVisibility(View.GONE);

      return view;
    } else {
      return mBaseAdapter.getView(sectionedPositionToPosition(position),
          convertView, parent);
    }
  }

  private void setViewText(TextView v, String text) {
    v.setText(text);
  }
}

Java Source Code List

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