Android Open Source - Test-SimpleTwitterClient Followings Fragment

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Java Source Code

package com.example.Twitter_Android.Fragments;
/*  w  ww .  j ava2  s  . c  o m*/
import android.app.Activity;
import android.app.DialogFragment;
import android.app.LoaderManager;
import android.content.Intent;
import android.content.Loader;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import com.example.Twitter_Android.AppActivity.ConcreteUserTimelineActivity;
import com.example.Twitter_Android.AsynkTasks.TaskUnfollow;
import com.example.Twitter_Android.Fragments.Adapters.FollowingsListAdapter;
import com.example.Twitter_Android.Fragments.Adapters.TimelineAdapter;
import com.example.Twitter_Android.Fragments.Dialogs.DirectMessageDialog;
import com.example.Twitter_Android.Loaders.FollowingsLoader;
import com.example.Twitter_Android.Logic.Constants;
import com.example.Twitter_Android.Logic.DataCache;
import com.example.Twitter_Android.Logic.Person;
import com.example.Twitter_Android.Net.Connector;
import com.example.Twitter_Android.R;

import java.util.List;

public class FollowingsFragment extends TimelineFragment<Person> {
  private final Connector connector;
  private TimelineAdapter<Person> currentAdapter;
  private static final FollowingsFragment instance;
  private long nextCursor = -1;
  private static final int FOLLOWINGS_LOADER = Constants.FOLLOWINGS_LOADER_ID;
  public static final String TAG = "TAG_FOLLOWINGS_FRAGMENT";
  private static final String ADAPTER_TAG = "Followings_FRAGMENT";

  static {
    instance = new FollowingsFragment();
  }

  private FollowingsFragment() {
    connector = new Connector();
    setRetainInstance(true);
    setHasOptionsMenu(true);
  }

  //------------------------------------------------------------------------------------------------------------------

  public static FollowingsFragment getInstance() {
    return instance;
  }
  //------------------------------------------------------------------------------------------------------------------

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

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

    if (currentAdapter == null) {
      currentAdapter = (FollowingsListAdapter) DataCache.getInstance().getAdapter(ADAPTER_TAG);
      if (currentAdapter == null) {
        LoaderManager loaderManager = getLoaderManager();
        if (loaderManager != null) {
          loaderManager.initLoader(FOLLOWINGS_LOADER, null, this);
        }
      } else {
        setListAdapter(currentAdapter);
      }
    }
    needNewestTweet = false;
  }
  //------------------------------------------------------------------------------------------------------------------

  @Override
  protected void loadOldItems() {
    LoaderManager loaderManager = getLoaderManager();
    if (loaderManager != null) {
      loaderManager.restartLoader(FOLLOWINGS_LOADER, null, this);
    }
  }

  //------------------------------------------------------------------------------------------------------------------

  @Override
  public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
    Person person = currentAdapter.getItem(position);
    Intent intent = new Intent(getActivity(), ConcreteUserTimelineActivity.class);
    intent.putExtra("PERSON_ID", person.getID());
    DataCache.getInstance().putPerson(person.getID(), person);
    startActivity(intent);
    return true;
  }

  //------------------------------------------------------------------------------------------------------------------

  @Override
  public Loader<List<Person>> onCreateLoader(int id, Bundle args) {
    if (id == FOLLOWINGS_LOADER) {
      return new FollowingsLoader(getActivity(), connector, nextCursor);
    }
    return null;
  }

  @Override
  public void onLoadFinished(Loader<List<Person>> loader, List<Person> data) {
    if (loader.getId() == FOLLOWINGS_LOADER) {
      if (currentAdapter == null) {
        currentAdapter = new FollowingsListAdapter(getActivity(), data, ADAPTER_TAG);
        setListAdapter(currentAdapter);
        DataCache.getInstance().saveAdapter(FollowingsListAdapter.TAG, currentAdapter);
      } else {
        currentAdapter.addItemsToBottom(data);
      }
      nextCursor = connector.getCurrentCursor();
      isLoading = false;
      if (nextCursor == 0) {
        needOldTweet = false;
        isLoading = true;
      }
    }
  }

  @Override
  public void onLoaderReset(Loader<List<Person>> loader) {
//    setListAdapter(null);
  }
  //------------------------------------------------------------------------------------------------------------------


  @Override
  public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    super.onCreateOptionsMenu(menu, inflater);
    inflater.inflate(R.menu.menu_followings, menu);
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
      case R.id.menu_item_unfollow:
        unfollow();
        return true;
    }
    return super.onOptionsItemSelected(item);
  }
  //------------------------------------------------------------------------------------------------------------------
  /*
      ?????????? ?? ?????????? ????? (followings).
   */
  private void unfollow() {
    Person toUnfollow = getSelectedItem();
    final long idToDelete = toUnfollow.getID();
    toUnfollow.changeFriendshipRelations();
    currentAdapter.removeItem(getSelectedListItemPosition());
    TaskUnfollow task = new TaskUnfollow();
    task.execute(idToDelete);
  }
}
Java Source Code List
