CheckinListAdapter.java

/**
 * Copyright 2008 Joe LaPenna
 */

package com.joelapenna.foursquared.widget;


import com.joelapenna.foursquare.Foursquare;
import com.joelapenna.foursquare.types.Checkin;
import com.joelapenna.foursquare.types.Group;
import com.joelapenna.foursquare.types.User;
import com.joelapenna.foursquared.FoursquaredSettings;
import com.joelapenna.foursquared.R;
import com.joelapenna.foursquared.Sync;
import com.joelapenna.foursquared.util.CheckinTimestampSort;
import com.joelapenna.foursquared.util.RemoteResourceManager;
import com.joelapenna.foursquared.util.StringFormatters;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Handler;
import android.text.TextUtils;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.io.IOException;
import java.util.Date;
import java.util.HashMap;
import java.util.Observable;
import java.util.Observer;

/**
 * @author Joe LaPenna (joe@joelapenna.com)
 * @author Mark Wyszomierski (markww@gmail.com)
 *   -Added local hashmap of cached timestamps processed at setGroup()
 *    time to conform to the same timestamp conventions other foursquare
 *    apps are using.
 */
public class CheckinListAdapter extends BaseCheckinAdapter implements ObservableAdapter {

    private static final String TAG = "CheckinListAdapter";
    private static final boolean DEBUG = FoursquaredSettings.DEBUG;

    private LayoutInflater mInflater;

    private RemoteResourceManager mRrm;
    private RemoteResourceManagerObserver mResourcesObserver;
    private SyncObserver mSyncObserver;
    private Handler mHandler = new Handler();
    private HashMap<String, String> mCachedTimestamps;
    private Sync mSync;
    private Context mContext;

    public CheckinListAdapter(Context context, RemoteResourceManager rrm, Sync sync) {
        super(context);
        mContext = context;
        mSync = sync;
        mInflater = LayoutInflater.from(context);
        mRrm = rrm;
        mResourcesObserver = new RemoteResourceManagerObserver();
        mSyncObserver = new SyncObserver();
        mCachedTimestamps = new HashMap<String, String>();
        mRrm.addObserver(mResourcesObserver);
        sync.getObservable().addObserver(mSyncObserver);
    }
    
    public void removeObserver() {
        mRrm.deleteObserver(mResourcesObserver);
        mSync.getObservable().deleteObserver(mSyncObserver);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // A ViewHolder keeps references to children views to avoid unnecessary
        // calls to findViewById() on each row.
        final ViewHolder holder;

        Checkin checkin = (Checkin) getItem(position);
        final User user = checkin.getUser();
        final Uri photoUri = Uri.parse(user.getPhoto());

        // When convertView is not null, we can reuse it directly, there is no
        // need to re-inflate it. We only inflate a new View when the
        // convertView supplied by ListView is null.
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.checkin_list_item, null);
            // Creates a ViewHolder and store references to the two children
            // views we want to bind data to.
            holder = new ViewHolder();
            holder.photo =  (MaybeContactView)convertView.findViewById(R.id.photo);
            holder.firstLine = (TextView) convertView.findViewById(R.id.firstLine);
            holder.secondLine = (TextView) convertView.findViewById(R.id.secondLine);
            holder.timeTextView = (TextView) convertView.findViewById(R.id.timeTextView);

            convertView.setTag(holder);
        } else {
            // Get the ViewHolder back to get fast access to the TextView
            // and the ImageView.
            holder = (ViewHolder) convertView.getTag();
        }
        holder.photo.setContactLookupUri(mSync.getContactLookupUri(mContext.getContentResolver(), user.getId()));
        
        try {
            Bitmap bitmap = BitmapFactory.decodeStream(mRrm.getInputStream(photoUri));
            holder.photo.setImageBitmap(bitmap);
        } catch (IOException e) {
            if (Foursquare.MALE.equals(user.getGender())) {
                holder.photo.setImageResource(R.drawable.blank_boy);
            } else {
                holder.photo.setImageResource(R.drawable.blank_girl);
            }
        }

        String checkinMsgLine1 = StringFormatters.getCheckinMessageLine1(checkin, true);
        String checkinMsgLine2 = StringFormatters.getCheckinMessageLine2(checkin);
        String checkinMsgLine3 = mCachedTimestamps.get(checkin.getId());
        
        holder.firstLine.setText(checkinMsgLine1);
        if (!TextUtils.isEmpty(checkinMsgLine2)) {
            holder.secondLine.setVisibility(View.VISIBLE);
            holder.secondLine.setText(checkinMsgLine2);
        } else {
            holder.secondLine.setVisibility(View.GONE);
        }
        holder.timeTextView.setText(checkinMsgLine3);
        
        return convertView;
    }

    @Override
    public void setGroup(Group<Checkin> g) {
        super.setGroup(g);
        mCachedTimestamps.clear();

        CheckinTimestampSort timestamps = new CheckinTimestampSort();
        
        for (Checkin it : g) {
            Uri photoUri = Uri.parse(it.getUser().getPhoto());
            if (!mRrm.exists(photoUri)) {
                mRrm.request(photoUri);
            }

            Date date = new Date(it.getCreated());
            if (date.after(timestamps.getBoundaryRecent())) {
                mCachedTimestamps.put(it.getId(), 
                    StringFormatters.getRelativeTimeSpanString(it.getCreated()).toString());
            } else if (date.after(timestamps.getBoundaryToday())) {
                mCachedTimestamps.put(it.getId(), StringFormatters.getTodayTimeString(it.getCreated()));
            } else if (date.after(timestamps.getBoundaryYesterday())) {
                mCachedTimestamps.put(it.getId(), StringFormatters.getYesterdayTimeString(it.getCreated()));
            } else {
                mCachedTimestamps.put(it.getId(), StringFormatters.getOlderTimeString(it.getCreated()));
            }
        }
    }

    private class RemoteResourceManagerObserver implements Observer {
        @Override
        public void update(Observable observable, Object data) {
            if (DEBUG) Log.d(TAG, "Fetcher got: " + data);
            mHandler.post(new Runnable() {
                @Override
                public void run() {
                    notifyDataSetChanged();
                }
            });
        }
    }

    private class SyncObserver implements Observer {
        
        @Override
        public void update(Observable observable, Object o) {
            mHandler.post(new Runnable() {
                @Override
                public void run() {
                    Log.i(TAG, "update received from sync");
                    notifyDataSetChanged();
                }
            });
        }
    }

    private static class ViewHolder {
        MaybeContactView photo;
        TextView firstLine;
        TextView secondLine;
        TextView timeTextView;
    }
}