Android Open Source - watchme Auto Complete Adapter

• Back to App/track  ↑

From Project

Back to project page watchme.

License

The source code is released under:

Copyright (c) 2012 Johan Brook, Robin Andersson, Lisa Stenberg, Mattias Henriksson Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documen...

Java Source Code

/**
*  AutoCompleteAdapter.java// w  w  w. java2s . c  o  m
*
*  Custom Array adapter for auto complete dropdowns.
*
*  Includes custom view drawing with objects of the type Movie instead
*  of plain Strings.  
*
*  @author Johan Brook
*  @copyright (c) 2012 Johan Brook, Robin Andersson, Lisa Stenberg, Mattias Henriksson
*  @license MIT
*/

package se.chalmers.watchme.activity;

import org.json.JSONArray;
import org.json.JSONObject;

import se.chalmers.watchme.R;
import se.chalmers.watchme.model.Movie;
import se.chalmers.watchme.net.MovieSource;
import se.chalmers.watchme.utils.DateTimeUtils;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;

public class AutoCompleteAdapter extends ArrayAdapter<JSONObject> implements Filterable {

  private LayoutInflater inflater;
  private MovieSource source;
  private JSONArray movies;
  
  /**
   * Create a new AutoCompleteAdapter.
   * 
   * <p>Custom filtering of movie suggestions from IMDb.</p>
   * 
   * @param context The context
   * @param textViewResourceId The view ID
   * @param source The data source to fetch movies from
   */
  public AutoCompleteAdapter(Context context, int textViewResourceId, MovieSource source) {
    super(context, textViewResourceId);
    
    this.source = source;
    this.inflater = LayoutInflater.from(getContext());
  }
  
  @Override
  public int getCount() {
    return this.movies.length();
  }
  
  @Override
  public JSONObject getItem(int position) {
    return this.movies.optJSONObject(position);
  }
  
  @Override
  public Filter getFilter() {
    
    return new Filter() {

      /*
       * Override this method in order to populate the auto complete field
       * with the actual movie name when selecting a suggestion from the list,
       * instead of the default toString implementation.
       * 
       * @see android.widget.Filter#convertResultToString(java.lang.Object)
       */
      @Override
      public CharSequence convertResultToString(Object result) {
        if(result instanceof JSONObject) {
          return ((JSONObject) result).optString(Movie.JSON_KEY_NAME);
        }
        
        return super.convertResultToString(result);
      }
      
      /*
       * The actual filtering, where the call to the API is made. The method
       * is called in a worker thread apart from the UI thread, so we're okay.
       * 
       * @see android.widget.Filter#performFiltering(java.lang.CharSequence)
       */
      @Override
      protected FilterResults performFiltering(CharSequence constraint) {
        
        FilterResults results = new FilterResults();
        if(constraint != null) {
          JSONArray json = source.getMoviesByTitle(constraint.toString());
          
          results.values = json;
          results.count = json.length();
        }
        
        return results;
      }

      /*
       * Update the list.
       * 
       * @see android.widget.Filter#publishResults(java.lang.CharSequence, android.widget.Filter.FilterResults)
       */
      @Override
      protected void publishResults(CharSequence constraint, FilterResults results) {
        if(results != null && results.count > 0) {
          movies = (JSONArray) results.values;
          notifyDataSetChanged();
        }
        else {
          notifyDataSetInvalidated();
        }
      }
      
    };
  }
  
  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    
    /**
     * Performance tweaks in overriden getView:
     * 
     * Re-use the "trash view" convertView instead of always inflating
     * a new view from XML. Only inflate if convertView is null.
     * 
     * Also make use of a ViewHolder to cache references to subviews. A 
     * reference to a ViewHolder is created if a new view is inflated,
     * otherwise we just use the attached ViewHolder of the old view.
     */
    
    ViewHolder holder;
    JSONObject suggestion = this.getItem(position);
    
    if(convertView == null) {
      convertView = this.inflater.inflate(R.layout.auto_complete_item, null);
      holder = new ViewHolder();
      holder.title = (TextView) convertView.findViewById(R.id.autocomplete_title);
      convertView.setTag(holder);
    }
    else {
      holder = (ViewHolder) convertView.getTag();
    }
    
    if(suggestion != null) {
      String releaseDate = suggestion.optString("released");
      releaseDate = (releaseDate.isEmpty()) ? null : releaseDate;
      String year = DateTimeUtils.parseYearFromDate(releaseDate);
      
      holder.title.setText(suggestion.optString(Movie.JSON_KEY_NAME) + 
          ( (year != null) ? " ("+ year +")" : "" ) );
    }
    
    return convertView;
  }
  
  /**
   * A ViewHolder with a title, year and position fields. 
   * 
   * @author Johan
   */
  static class ViewHolder {
    public TextView title;
    public int position;
  }

}

Java Source Code List

• Back to App/track  ↑