ChannelLookupListFragment.java

package com.distantfuture.videos.channellookup;

import android.app.ListFragment;
import android.app.LoaderManager;
import android.content.Loader;
import android.os.Bundle;
import android.os.Handler;
import android.text.TextUtils;
import android.view.View;
import android.widget.ListView;

import com.distantfuture.videos.database.YouTubeData;
import com.distantfuture.videos.misc.BusEvents;

import java.util.ArrayList;
import java.util.List;

import de.greenrobot.event.EventBus;

public class ChannelLookupListFragment extends ListFragment implements LoaderManager.LoaderCallbacks<List<YouTubeData>> {
  private ChannelLookupAdapter mAdapter;
  private String mQuery;
  private String mPendingQuery;

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

    getListView().setFastScrollEnabled(false);  // true made it difficult to hit add and remove buttons
    EventBus.getDefault().register(this);

    mAdapter = new ChannelLookupAdapter(getActivity());

    setEmptyText("Nothing found");
    setListAdapter(mAdapter);
    setListShown(false);
    getLoaderManager().initLoader(0, null, this);
  }

  @Override
  public void onLoadFinished(Loader<List<YouTubeData>> arg0, List<YouTubeData> data) {
    mAdapter.setData(data);

    ChannelLookupActivity activity = (ChannelLookupActivity) getActivity();
    activity.adapterDataChanged();

    if (isResumed()) {
      setListShown(true);
    } else {
      setListShownNoAnimation(true);
    }
  }

  @Override
  public void onDestroy() {
    EventBus.getDefault().unregister(this);

    super.onDestroy();
  }

  // eventbus event
  public void onEventMainThread(BusEvents.ContentEvent event) {
    // refresh list if channels update if not doing a search
    // search will have to refresh itself in the adapter to refresh the plus minus buttons
    if (TextUtils.isEmpty(mQuery))
      getLoaderManager().restartLoader(0, null, this);
  }

  public int getCount() {
    if (mAdapter != null)
      return mAdapter.getCount();

    return 0;
  }

  public List<String> getChannels() {
    List<String> result = new ArrayList<String>();

    if (mAdapter != null) {
      int cnt = mAdapter.getCount();

      for (int i = 0; i < cnt; i++) {
        YouTubeData data = mAdapter.getItem(i);

        if (data != null)
          result.add(data.mChannel);
      }
    }

    return result;
  }

  public String getQuery() {
    return mQuery;
  }

  public void setQuery(String inQuery) {
    if (!TextUtils.equals(mPendingQuery, inQuery)) {
      mPendingQuery = inQuery;

      new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
          if (!TextUtils.equals(mPendingQuery, mQuery)) {
            mQuery = mPendingQuery;
            ChannelLookupListFragment.this.getLoaderManager().restartLoader(0, null, ChannelLookupListFragment.this);
          }
        }
      }, 100);

    }
  }

  @Override
  public void onLoaderReset(Loader<List<YouTubeData>> arg0) {
    mAdapter.setData(null);
  }

  @Override
  public void onListItemClick(ListView l, View v, int position, long id) {
    YouTubeData selectedMedia = mAdapter.getItem(position);
    handleNavigation(selectedMedia, false);
  }

  private void handleNavigation(YouTubeData info, boolean autoStart) {
    ChannelDetailsActivity.show(getActivity(), info);
  }

  @Override
  public Loader<List<YouTubeData>> onCreateLoader(int arg0, Bundle arg1) {
    return new ChannelLookupItemLoader(getActivity(), mQuery);
  }
}