ProfileListFragment.java

/**********************************************
 * ProfileListFragment
 * A single row in the profile list in ProfileListActivity
 * Heavily based off of the Master Flow template
 * Changes include:
 * 	-Now works with Profile instead of DummyClass
 * 	-Includes custom profile adapter, ProfileAdapter, as nested class
 * ********************************************/

package edu.grinnell.appdev.grinnelldirectory.Fragments;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.PauseOnScrollListener;
import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener;

import java.util.List;

import edu.grinnell.appdev.grinnelldirectory.Models.Profile;
import edu.grinnell.appdev.grinnelldirectory.R;

public class ProfileListFragment extends ListFragment {

	public static ProfileAdapter profileAdapter;
	private ImageLoader imageLoader;
	
	private static final String STATE_ACTIVATED_POSITION = "activated_position";

	private Callbacks mCallbacks = sDummyCallbacks;
	private int mActivatedPosition = ListView.INVALID_POSITION;

	public interface Callbacks {

		public void onItemSelected(String id);
	}

	private static Callbacks sDummyCallbacks = new Callbacks() {
		@Override
		public void onItemSelected(String id) {
		}
	};

	public ProfileListFragment() {
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(
				getActivity()).build();
		imageLoader = ImageLoader.getInstance();
		imageLoader.init(config);
		profileAdapter = new ProfileAdapter(Profile.ITEMS, getActivity(),
				imageLoader);
		this.setListAdapter(profileAdapter);
	}

	@Override
	public void onViewCreated(View view, Bundle savedInstanceState) {
		super.onViewCreated(view, savedInstanceState);
		if (savedInstanceState != null
				&& savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {
			setActivatedPosition(savedInstanceState
					.getInt(STATE_ACTIVATED_POSITION));
		}
		
		//pause list on scroll to prevent picture loading lag
		boolean pauseOnScroll = false;
		boolean pauseOnFling = false;
		PauseOnScrollListener listener = new PauseOnScrollListener(imageLoader, pauseOnScroll, pauseOnFling);
		ListView listview = (ListView) view.findViewById(android.R.id.list);
		listview.setOnScrollListener(listener);
	}

	@Override
	public void onAttach(Activity activity) {
		super.onAttach(activity);
		if (!(activity instanceof Callbacks)) {
			throw new IllegalStateException(
					"Activity must implement fragment's callbacks.");
		}

		mCallbacks = (Callbacks) activity;
	}

	@Override
	public void onDetach() {
		super.onDetach();
		mCallbacks = sDummyCallbacks;
	}

	@Override
	public void onListItemClick(ListView listView, View view, int position,
			long id) {
		super.onListItemClick(listView, view, position, id);
		mCallbacks.onItemSelected(Profile.ITEMS.get(position).username);
	}

	@Override
	public void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		if (mActivatedPosition != ListView.INVALID_POSITION) {
			outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
		}
	}

	public void setActivateOnItemClick(boolean activateOnItemClick) {
		getListView().setChoiceMode(
				activateOnItemClick ? ListView.CHOICE_MODE_SINGLE
						: ListView.CHOICE_MODE_NONE);
	}

	public void setActivatedPosition(int position) {
		if (position == ListView.INVALID_POSITION) {
			getListView().setItemChecked(mActivatedPosition, false);
		} else {
			getListView().setItemChecked(position, true);
		}

		mActivatedPosition = position;
	}

	public static void refresh() {
		if (profileAdapter != null)
			profileAdapter.notifyDataSetChanged();
	}

	// The custom list adapter as a nested class
	public class ProfileAdapter extends ArrayAdapter<Profile> {

		private List<Profile> profileList; // The list of profiles we're dealing
		// with.

		private Context context; // The context of the list row
		private ImageLoader imageLoader; // Universal imageLoader, for loading

		// images from URLs

		// Constructor
		public ProfileAdapter(List<Profile> profileList, Context ctx,
				ImageLoader imageLoader) {
			super(ctx, R.layout.fragment_result_list_entry, profileList);
			this.profileList = profileList;
			this.context = ctx;
			this.imageLoader = imageLoader;
		}

		// Construts the view
		public View getView(int position, View convertView, ViewGroup parent) {

			// First let's verify the convertView is not null
			if (convertView == null) {
				// This a new view we inflate the new layout
				LayoutInflater inflater = (LayoutInflater) context
						.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
				convertView = inflater.inflate(
						R.layout.fragment_result_list_entry, parent, false);
			}

			// Now we can fill the layout with the right values
			Profile p = profileList.get(position);

			// Fills the textview with username
			((TextView) convertView.findViewById(R.id.textName))
					.setText(p.lastName + " " + p.firstName);

			((TextView) convertView.findViewById(R.id.textClass))
					.setText(p.dept);

			((TextView) convertView.findViewById(R.id.textUsername))
					.setText("[" + p.username + "]");

			// Initializes an imageView
			final ImageView imgview = ((ImageView) convertView
					.findViewById(R.id.imageImg));

			if (p.picurl != "") {

				// Fills the imageView with universalImageLoader
				imageLoader.loadImage(p.picurl,
						new SimpleImageLoadingListener() {
							@Override
							public void onLoadingComplete(String imageUri,
									View view, Bitmap loadedImage) {
								imgview.setImageBitmap(loadedImage);
							}
						});
			} else
				imgview.setImageResource(R.drawable.nopic);

			return convertView;
		}
	}

}