Android Open Source - SELP2013 Course List Adapter

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License

The source code is released under:
License ======= This work is licensed under the BSD 2-clause license as follows. # BSD 2-clause license Copyright (c) 2013, Sky Welch All rights reserved. Redistribution and use in source and ...
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Java Source Code

package uk.co.skywelch.selp2013;
//from  w  w w  .  java 2s  .c  o  m
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;

import com.google.gson.Gson;

public class CourseListAdapter extends BaseAdapter implements Filterable {
  public static final String TAG = "CourseListAdapter";

  private Context mContext;
  private int layoutResourceId;
  private ArrayList<Course> courses;
  private ArrayList<Course> orig_courses;
  private CourseFilter courseFilter;

  public CourseListAdapter(Context mContext, int layoutResourceId, ArrayList<Course> courses) {
    this.layoutResourceId = layoutResourceId;
    this.mContext = mContext;
    this.courses = courses;
    this.orig_courses = courses;
  }

  // Listener handling changes in course checkbox state
  private OnClickListener onCourseCheckedListener = new OnClickListener() {
    @Override
    public void onClick(View v) {
      CheckBox checkbox = (CheckBox) v;
      boolean isChecked = checkbox.isChecked();
      String tag = checkbox.getTag().toString();
      if (tag != null) {
        boolean check_stored = TimetableActivity.course_checks.contains(tag);

        // Update course check map if the stored state should change
        if (check_stored && !isChecked)
          TimetableActivity.course_checks.remove(tag);
        else if (!check_stored && isChecked)
          TimetableActivity.course_checks.add(tag);

        if (check_stored != isChecked) {
          Log.d(TAG, "Setting course " + tag + " checked state to " + isChecked);
          TimetableActivity.checked_semesterone_adapter.resetItems();
          TimetableActivity.checked_semestertwo_adapter.resetItems();

          Gson gson = new Gson();
          String json_checks = gson.toJson(TimetableActivity.course_checks);
          
          // Save the new check state
          SharedPreferences preferences = PreferenceManager
              .getDefaultSharedPreferences(mContext);
          SharedPreferences.Editor editor = preferences.edit();
          editor.putString("course_checks", json_checks);
          editor.commit();
        }
      }
    }
  };

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView == null) {
      LayoutInflater inflater = ((Activity) mContext).getLayoutInflater();
      convertView = inflater.inflate(layoutResourceId, parent, false);
    }

    Course course = (Course) getItem(position);

    TextView tvTitle = (TextView) convertView.findViewById(R.id.rowTitle);
    tvTitle.setText(course.getNamePlusAcronym());

    CheckBox tvCheckbox = (CheckBox) convertView.findViewById(R.id.textTimetableDescription);

    boolean child_checked = TimetableActivity.course_checks.contains(course.acronym);
    tvCheckbox.setChecked(child_checked);

    tvCheckbox.setTag(new String(course.acronym));

    tvCheckbox.setOnClickListener(onCourseCheckedListener);

    return convertView;
  }

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

  private class CourseFilter extends Filter {

    @Override
    protected FilterResults performFiltering(CharSequence constraint) {
      FilterResults results = new FilterResults();

      if (constraint == null || constraint.length() == 0) {
        results.values = orig_courses;
        results.count = orig_courses.size();
      } else {
        List<Course> nCourses = new ArrayList<Course>();

        constraint = constraint.toString().toUpperCase(Locale.US);
        for (Course c : orig_courses) {
          boolean b = false;
          if (CourseListActivity.course_filter == 0) {
            b = c.getNamePlusAcronym().toUpperCase(Locale.US).contains(constraint);
          } else if (CourseListActivity.course_filter == 1) {
            b = c.types_string.toUpperCase(Locale.US).contains(constraint);
          } else if (CourseListActivity.course_filter == 2) {
            b = Integer.toString(c.level).toUpperCase(Locale.US).equals(constraint);
          } else if (CourseListActivity.course_filter == 3) {
            b = Integer.toString(c.points).toUpperCase(Locale.US).equals(constraint);
          } else if (CourseListActivity.course_filter == 4) {
            b = Integer.toString(c.year).toUpperCase(Locale.US).equals(constraint);
          } else if (CourseListActivity.course_filter == 5) {
            b = c.deliveryperiod.toUpperCase(Locale.US).equals("S" + constraint);
          } else if (CourseListActivity.course_filter == 6) {
            b = c.lecturer.toUpperCase(Locale.US).contains(constraint);
          }

          if (b) {
            nCourses.add(c);
          }
        }

        results.values = nCourses;
        results.count = nCourses.size();
      }

      return results;
    }

    @SuppressWarnings("unchecked")
    @Override
    protected void publishResults(CharSequence constraint, FilterResults results) {
      if (results.count == 0) {
        notifyDataSetInvalidated();

        courses = new ArrayList<Course>();
      } else {
        courses = (ArrayList<Course>) results.values;
        notifyDataSetChanged();
      }
    }
  }

  @Override
  public Filter getFilter() {
    if (courseFilter == null)
      courseFilter = new CourseFilter();

    return courseFilter;
  }

  public void resetData() {
    courses = orig_courses;
  }

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

  @Override
  public Object getItem(int position) {
    return courses.get(position);
  }

  @Override
  public long getItemId(int position) {
    return position;
  }
}
Java Source Code List
