Android Open Source - Test-SimpleTwitterClient Home Timeline Fragment

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Java Source Code

package com.example.Twitter_Android.Fragments;
/*  w w  w  . j  a  va2 s .  c o  m*/
import android.app.*;
import android.content.ComponentName;
import android.content.Context;
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 android.widget.ListView;
import android.widget.SearchView;
import com.example.Twitter_Android.AppActivity.ConcreteUserTimelineActivity;
import com.example.Twitter_Android.AppActivity.SearchableActivity;
import com.example.Twitter_Android.Fragments.Adapters.TimelineAdapter;
import com.example.Twitter_Android.Fragments.Adapters.TweetAdapter;
import com.example.Twitter_Android.Fragments.Dialogs.UserInfoDialog;
import com.example.Twitter_Android.Loaders.HomeTimelineLoader;
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 HomeTimelineFragment extends TimelineFragment<Tweet> {
  private TimelineAdapter<Tweet> currentAdapter;
  private static final String MAX_ID = "MAX_ID";
  private static final String SINCE_ID = "SINCE_ID";
  private static final HomeTimelineFragment instance;
  private static final int OLD_TWEETS_LOADER = Constants.HOME_OLD_TWEETS_LOADER;
  private static final int NEWEST_TWEETS_LOADER_ID = Constants.HOME_NEWEST_TWEETS_LOADER;
  private static final String ADAPTER_TAG = "H_TL_F_A";   //Home_TimeLine_Fragment_Adapter

  public static final String TAG = "TAG_HOME_TIMELINE_FRAGMENT";
  private static final DataCache cache = DataCache.getInstance();

  static {
    instance = new HomeTimelineFragment();
    instance.setHasOptionsMenu(true);
    instance.setRetainInstance(true);
  }

  //------------------------------------------------------------------------------------------------------------------
  private HomeTimelineFragment() {
  }

  public static HomeTimelineFragment newInstance() {
    return instance;
  }

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

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

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

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

  @Override
  public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
    Person selectedTweetAuthor = getItem(position).getAuthor();
    view.setBackground(getResources().getDrawable(R.drawable.rounded_corners_pressed));
    Intent intent = new Intent(getActivity(), ConcreteUserTimelineActivity.class);
    intent.putExtra("PERSON_ID", selectedTweetAuthor.getID());
    cache.putPerson(selectedTweetAuthor.getID(), selectedTweetAuthor);
    startActivity(intent);
    return true;
  }

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

  /**
   * ????????? ???????? ?????.
   * ??????????, ????? ???????????? ??????? ????? ? ??????, ?? ???? ?????? ???? ? NEWEST_TWEET_LOAD_PERIOD ??.
   */
  protected void loadNewestItems() {
    System.out.println("LOAD NEWEST");
    Bundle args = new Bundle();
    long sinceID = getSinceID();
    args.putLong(SINCE_ID, sinceID);
    LoaderManager loaderManager = getLoaderManager();
    if (loaderManager != null) {
      loaderManager.restartLoader(NEWEST_TWEETS_LOADER_ID, args, this);
    }
  }

  //------------------------------------------------------------------------------------------------------------------
  @Override
  public Loader<List<Tweet>> onCreateLoader(int id, Bundle args) {
    switch (id) {
      case OLD_TWEETS_LOADER:
        /*
          ?????????, ??? HOME_OLD_TWEETS_LOADER, ?? ???????? USER_ID_VALUE ?????? == 0, ? ????? ????? ??????
          ???????? MAX_ID (?.?. max_id ? api twitter'?)
         */
        long tweetMaxValue = 0;
        if (args != null) {
          tweetMaxValue = args.getLong(MAX_ID, 0);
        }
        System.out.println("onCreateLoader maxID=" + tweetMaxValue);
        return new HomeTimelineLoader(getActivity(), tweetMaxValue, 0);

      case NEWEST_TWEETS_LOADER_ID:
        long sinceIdValue = 0;
        if (args != null) {
          sinceIdValue = args.getLong(SINCE_ID, 0);
        }
        return new HomeTimelineLoader(getActivity(), 0, sinceIdValue);
    }
    return null;
  }

  @Override
  public void onLoadFinished(Loader<List<Tweet>> loader, List<Tweet> data) {
    if (data.size() > 0) {
      switch (loader.getId()) {
        case OLD_TWEETS_LOADER:   //????????? ?????? ?????.
          if (currentAdapter == null) {
            currentAdapter = new TweetAdapter(getActivity(), data, ADAPTER_TAG);
            setListAdapter(currentAdapter);
          } else {
            currentAdapter.addItemsToBottom(data);
          }

          if (data.size() < TWEETS_BEFORE_END) {
            //????????? ???, ??? ????? - ?????? ??????? ?? ?????.
            needOldTweet = false;
          }
          break;

        case NEWEST_TWEETS_LOADER_ID: //????????? ???????? ?????.
          int pos = data.size() - 1;
          currentAdapter.addItemsToTop(data);
          ListView listView = getListView();
          if (listView != null) {
            listView.setSelection(pos);
          }
          break;
      }
    }
    isLoading = false;
  }

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

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

    SearchView searchView = (SearchView) menu.findItem(R.id.menu_search).getActionView();
    if (searchView == null) {
      return;
    }

    Activity activity = getActivity();
    if (activity != null) {
      SearchManager searchManager = (SearchManager) activity.getSystemService(Context.SEARCH_SERVICE);
      ComponentName cn = new ComponentName(activity, SearchableActivity.class);
      SearchableInfo info = searchManager.getSearchableInfo(cn);
      searchView.setSearchableInfo(info);
    }
  }

  @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
