Android Open Source - Test-SimpleTwitterClient Concrete User Timeline Fragment

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Java Source Code

package com.example.Twitter_Android.Fragments;
/*from w w w . ja v a 2 s. co  m*/
import android.app.Activity;
import android.app.DialogFragment;
import android.app.LoaderManager;
import android.content.Loader;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageView;
import com.example.Twitter_Android.AsynkTasks.ImageDownloader;
import com.example.Twitter_Android.Fragments.Adapters.ConcreteUserTimelineAdapter;
import com.example.Twitter_Android.Fragments.Adapters.TimelineAdapter;
import com.example.Twitter_Android.Fragments.Dialogs.UserInfoDialog;
import com.example.Twitter_Android.Loaders.UserTimelineLoader;
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.Logic.Tweet;
import com.example.Twitter_Android.R;

import java.util.List;

public class ConcreteUserTimelineFragment extends TimelineFragment<Tweet> {
  private TimelineAdapter<Tweet> currentAdapter;
  private static final String TAG_UID = "VALUE_USER_ID";
  private static final String MAX_ID = "VALUE_MAX_ID";
  private static final String SINCE_ID = "VALUE_SINCE_ID";
  public static final String TAG = "CONCRETE_USER_TIMELINE_FRAGMENT";
  private static final String ADAPTER_TAG = "C_U_TL_F";   //Concrete_User_TimeLine_Fragment
  private static final int FIRST_TIME_LOADER = Constants.CONCRETE_USER_TIMELINE_LOADER;
  private static final int OLD_TWEETS_LOADER = Constants.CONCRETE_USER_OLD_TWEETS_LOADER;
  private static final int NEWEST_TWEETS_LOADER = Constants.CONCRETE_USER_NEWEST_TWEETS_LOADER;
  private static Person currentPerson;
  private static ImageView avatar;
  private final ImageDownloader imageDownloader = new ImageDownloader();
  private final DataCache cache = DataCache.getInstance();

  //------------------------------------------------------------------------------------------------------------------
  public static ConcreteUserTimelineFragment newInstance(Person person, ImageView selectedPersonAvatar) {
    ConcreteUserTimelineFragment fragment = new ConcreteUserTimelineFragment();
    currentPerson = person;
    avatar = selectedPersonAvatar;
    Bundle args = new Bundle();
    args.putLong(TAG_UID, person.getID());
    fragment.setArguments(args);
    fragment.setHasOptionsMenu(true);
    return fragment;
  }

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

  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    Bundle args = getArguments();
    LoaderManager loaderManager = getLoaderManager();
    if (args != null) {
      if (loaderManager != null) {
        loaderManager.restartLoader(FIRST_TIME_LOADER, args, this);
      }
    }

    if (currentAdapter == null) {
      /*
        ????? ?????????? ????????, ????? ?? ???????????? ? ????? ?????????, ???????? ?? ?????? ????????.
        ? ????? ??????, ????? ?? ??????? ????? ????? ? ?? ????????? ??????? (?????), ????? ??????????? ???????
        ? ?????????? ???.
       */
      currentAdapter = (ConcreteUserTimelineAdapter) cache.getAdapter(ADAPTER_TAG);
      if (currentAdapter != null) {
        setListAdapter(currentAdapter);
        currentAdapter.updateContext(getActivity());
      } else {
        if (loaderManager != null) {
          loaderManager.initLoader(FIRST_TIME_LOADER, null, this);
        }
      }
    } else {
      /*
        ?.?. ?????? ???????? setRetainInstance(true), ?? ??? ????????? ????????????
        (??? ???????? ??????, ????????) ?????????? ???????? ?????? ?? MainActivity.
        ????? ????????? ?????? ???? "java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState",
        ????? ?????? ???????? ???????????? ? ??????????? (? ?? ? ???????) ????????.
       */
      currentAdapter.updateContext(getActivity());
    }
  }

  //------------------------------------------------------------------------------------------------------------------
  @Override
  protected void loadOldItems() {
    Bundle args = new Bundle();
    long maxID = getMaxId();
    long uid = currentPerson.getID();
    args.putLong(MAX_ID, maxID);
    args.putLong(TAG_UID, uid);
    LoaderManager loaderManager = getLoaderManager();
    if (loaderManager != null) {
      loaderManager.restartLoader(OLD_TWEETS_LOADER, args, this);
    }
  }

  @Override
  protected void loadNewestItems() {
    Bundle args = new Bundle();
    long sinceID = getSinceID();
    long uid = currentPerson.getID();
    args.putLong(SINCE_ID, sinceID);
    args.putLong(TAG_UID, uid);
    LoaderManager loaderManager = getLoaderManager();
    if (loaderManager != null) {
      loaderManager.restartLoader(NEWEST_TWEETS_LOADER, args, this);
    }
  }
  //------------------------------------------------------------------------------------------------------------------

  @Override
  public Loader<List<Tweet>> onCreateLoader(int id, Bundle args) {
    /*
      ????? ?????:
              ???? id == FIRST_TIME_LOADER, ?? maxID ? sinceID == 0
          ???? id == OLD_TWEETS_LOADER, ?? maxID !=0 ? sinceID == 0
          ???? id == NEWEST_TWEETS_LOADER, ?? maxID ==0 ? sinceID != 0
     */
    long uid = args.getLong(TAG_UID, 0);
    long maxID = args.getLong(MAX_ID, 0);
    long sinceID = args.getLong(SINCE_ID, 0);
    return new UserTimelineLoader(getActivity(), uid, maxID, sinceID);
  }
  //------------------------------------------------------------------------------------------------------------------

  @Override
  public void onLoadFinished(Loader<List<Tweet>> loader, List<Tweet> data) {
    if (data.size() > 0) {
      if (currentAdapter == null) {
        currentAdapter = new ConcreteUserTimelineAdapter(getActivity(), data, ADAPTER_TAG);
        setListAdapter(currentAdapter);
      } else {
        switch (loader.getId()) {
          case FIRST_TIME_LOADER:
            currentAdapter.addItemsInstead(data);
            break;

          case OLD_TWEETS_LOADER:
            currentAdapter.addItemsToBottom(data);
            break;

          case NEWEST_TWEETS_LOADER:
            currentAdapter.addItemsToTop(data);
            break;
        }
      }
      Activity activity = getActivity();
      if (activity != null) {
        activity.setTitle(currentPerson.getName());
      }
    }
    isLoading = false;
  }
  //------------------------------------------------------------------------------------------------------------------

  @Override
  public void onLoaderReset(Loader<List<Tweet>> loader) {
    currentAdapter = null;
    setListAdapter(null);
  }

  @Override
  public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
    Activity activity = getActivity();
    if (activity != null) {
      currentPerson = getItem(position).getAuthor();
      imageDownloader.loadBitmap(currentPerson.getProfileImage(), avatar);
      final long selectedUserId = currentPerson.getID();
      Bundle args = new Bundle();
      args.putLong(TAG_UID, selectedUserId);
      activity.setTitle("Loading: " + currentPerson.getName());
      LoaderManager loaderManager = getLoaderManager();
      if (loaderManager != null) {
        getLoaderManager().restartLoader(FIRST_TIME_LOADER, args, this);
      }
      return true;
    }
    return false;
  }
  //------------------------------------------------------------------------------------------------------------------


  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
      case R.id.menu_item_info:
        showInfo();
        return true;
    }
    return super.onOptionsItemSelected(item);
  }

  private void showInfo() {
    final Tweet tweet = getSelectedItem();
    if (tweet != null) {
      Activity activity = getActivity();
      if (activity != null) {
        Person person = tweet.getAuthor();
        final DialogFragment dialog = UserInfoDialog.newInstance(person);
        dialog.show(activity.getFragmentManager().beginTransaction(), UserInfoDialog.TAG);
      }
    }
  }
}
Java Source Code List
