NewsItemListFragment.java

package com.vladstoick.Fragments;

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;

import com.actionbarsherlock.app.SherlockFragment;
import com.vladstoick.DataModel.NewsDataSource;
import com.vladstoick.DataModel.NewsItem;
import com.vladstoick.DataModel.NewsSource;
import com.vladstoick.Utils.Adapters.NewsItemAdapter;
import com.vladstoick.stiridinromania.R;
import com.vladstoick.stiridinromania.StiriApp;

import butterknife.InjectView;
import butterknife.Views;

/**
 * A list fragment representing a list of NewsItems. This fragment
 * also supports tablet devices by allowing list items to be given an
 * 'activated' state upon selection. This helps indicate which item is
 * currently being viewed in a {@link com.vladstoick.Fragments.NewsItemDetailFragment}.
 * <p/>
 * Activities containing this fragment MUST implement the {@link Callbacks}
 * interface.
 */
public class NewsItemListFragment extends SherlockFragment implements
        AdapterView.OnItemClickListener{
    @InjectView(R.id.newsitem_listview )ListView mListView;
    NewsSource ns;
    private static final String STATE_ACTIVATED_POSITION = "activated_position";
    private Callbacks mCallbacks = null;
    private int mActivatedPosition = ListView.INVALID_POSITION;
    public interface Callbacks {
        public void onItemSelected(NewsItem newsItem, int position);
    }


    public static NewsItemListFragment newInstance(NewsSource newsSource) {
        NewsItemListFragment fragment = new NewsItemListFragment();
        Bundle extras = new Bundle();
        extras.putParcelable(NewsSource.TAG, newsSource);
        fragment.setArguments(extras);
        return fragment;
    }

    /**
     * Mandatory empty constructor for the fragment manager to instantiate the
     * fragment (e.g. upon screen orientation changes).
     */
    public NewsItemListFragment() {
    }

    public void setNewsSourceId(int id) {
        this.ns = NewsDataSource.getInstance().getNewsSource(id);
        mListView.setAdapter(new NewsItemAdapter(getActivity(), ns.news));
    }

    @Override
    public void onResume() {
        super.onResume();
        if(mListView!=null && this.ns!=null){
            this.ns = NewsDataSource.getInstance().getNewsSource(this.ns.getId());
            NewsItemAdapter adapter = (NewsItemAdapter) mListView.getAdapter();
            adapter.news = this.ns.news;
            adapter.notifyDataSetChanged();
        }
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_newsitem_list,container,true);
        Views.inject(this,view);
        mListView.setOnItemClickListener(this);
        return view;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        // Restore the previously serialized activated item position.
        if (savedInstanceState != null
                && savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {
            setActivatedPosition(savedInstanceState.getInt(STATE_ACTIVATED_POSITION));
        }
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        // Activities containing this fragment must implement its callbacks.
        if (!(activity instanceof Callbacks)) {
            throw new IllegalStateException("Activity must implement fragment's callbacks.");
        }

        mCallbacks = (Callbacks) activity;
    }

    @Override
    public void onDetach() {
        super.onDetach();

        // Reset the active callbacks interface to the dummy implementation.
        mCallbacks = null;
    }

    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
        mCallbacks.onItemSelected(ns.news.get(i),i);
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        if (mActivatedPosition != ListView.INVALID_POSITION) {
            // Serialize and persist the activated item position.
            outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
        }
    }

    /**
     * Turns on activate-on-click mode. When this mode is on, list items will be
     * given the 'activated' state when touched.
     */
    public void setActivateOnItemClick(boolean activateOnItemClick) {
        // When setting CHOICE_MODE_SINGLE, ListView will automatically
        // give items the 'activated' state when touched.
        mListView.setChoiceMode(activateOnItemClick
                ? ListView.CHOICE_MODE_SINGLE
                : ListView.CHOICE_MODE_NONE);
    }

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

        mActivatedPosition = position;
    }
}