TagListAdapter.java

package org.redcross.openmapkit;

import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.spatialdev.osm.model.OSMElement;

import org.redcross.openmapkit.odkcollect.ODKCollectData;
import org.redcross.openmapkit.odkcollect.ODKCollectHandler;
import org.redcross.openmapkit.odkcollect.tag.ODKTag;

import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;

public class TagListAdapter extends BaseAdapter {

    private LayoutInflater inflater;
    private Map<String, String> tagMap;
    private ArrayList<String> tagKeys;

    public TagListAdapter(Activity activity, OSMElement osmElement) {

        tagMap = new LinkedHashMap<>();

        if (ODKCollectHandler.isODKCollectMode()) {
            Map<String,String> tags = osmElement.getTags();
            Map<String, String> readOnlyTags = new LinkedHashMap<>(tags);
            ODKCollectData odkCollectData = ODKCollectHandler.getODKCollectData();
            Collection<ODKTag> requiredTags = odkCollectData.getRequiredTags();
            for (ODKTag odkTag : requiredTags) {
                String key = odkTag.getKey();
                String val = tags.get(key);
                if (Constraints.singleton().tagShouldBeShown(key, osmElement)) {
                    tagMap.put(key, val);
                }
                readOnlyTags.remove(key);
            }
            Set<String> readOnlyKeys = readOnlyTags.keySet();
            for (String readOnlyKey : readOnlyKeys) {
                tagMap.put(readOnlyKey, tags.get(readOnlyKey));
            }
        } else {
            tagMap = osmElement.getTags();
        }
        
        Set<String> keys = tagMap.keySet();
        tagKeys = new ArrayList<>();
        for(String key: keys) {
            tagKeys.add(key);
        }

        inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    /**
     * Implementing Adapter inherited abstract methods
     */
    public int getCount() {
        return tagMap.size();
    }

    /**
     * Implementing Adapter inherited abstract methods
     */
    public Object getItem(int arg0) {
        return null;
    }

    /**
     * Implementing Adapter inherited abstract methods
     */
    public long getItemId(int position) {
        return 0;
    }

    public boolean isEmpty() {
        if (tagMap == null || tagMap.size() == 0) {
            return true;
        }
        return false;
    }
    
    public String getTagKeyForIndex(int idx) {
        String[] keys = tagMap.keySet().toArray(new String[tagMap.size()]);
        return keys[idx];
    }
    
    /**
     * Implementing Adapter inherited abstract methods
     */
    public View getView(int position, View convertView, ViewGroup parent) {

        //create the view for an individual list view item ...

        View view = convertView;

        ViewHolder mViewHolder;
        if(convertView == null) {

            view = inflater.inflate(R.layout.taglistviewitem, null);

            mViewHolder = new ViewHolder();
            mViewHolder.textViewTagKey = (TextView)view.findViewById(R.id.textViewTagKey); //left side tag key
            mViewHolder.textViewTagValue = (TextView)view.findViewById(R.id.textViewTagValue); //left side tag value

            view.setTag(mViewHolder);
        }
        else {

            mViewHolder = (ViewHolder)view.getTag();
        }

        //tag key and value
        String currentTagKey = tagKeys.get(position);
        String currentTagValue = tagMap.get(currentTagKey);

        //labels for tag key and value
        String currentTagKeyLabel = null;
        String currentTagValueLabel = null;

        //attempt to assign labels for tag key and value if available from ODK Collect Mode
        if(ODKCollectHandler.isODKCollectMode()) {

            ODKCollectData odkCollectData = ODKCollectHandler.getODKCollectData();

            if(odkCollectData != null) {

                try {

                    currentTagKeyLabel = odkCollectData.getTagKeyLabel(currentTagKey);
                    currentTagValueLabel = odkCollectData.getTagValueLabel(currentTagKey, currentTagValue);
                }
                catch (Exception ex) {

                    Log.e("error", "exception raised when calling getTagKeyLabel or getTagValueLabel with tag key: '" + currentTagKey + "' and tag value: '" + currentTagValue + "'") ;
                }
            }
        }

        //present tag key
        if(currentTagKeyLabel != null) {
            mViewHolder.textViewTagKey.setText(currentTagKeyLabel);
        } else {
            mViewHolder.textViewTagKey.setText(currentTagKey);
        }

        //present tag value
        if(currentTagValueLabel != null) {
            mViewHolder.textViewTagValue.setText(currentTagValueLabel);
        } else {
            mViewHolder.textViewTagValue.setText(currentTagValue);
        }

        return view;
    }

    static class ViewHolder{
        TextView textViewTagKey;
        TextView textViewTagValue;
    }
    
}