Android Open Source - dn-rss News Item Slideshow Fragment

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License

The source code is released under:

MIT License

Java Source Code

package kaka.android.dn;
//from  w w  w. j  a v a2s.co  m
import android.app.Activity;
import android.os.Bundle;
import android.app.Fragment;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.Timer;
import java.util.TimerTask;


/**
 * A simple {@link Fragment} subclass.
 * Activities that contain this fragment must implement the
 * {@link NewsItemSlideshowFragment.OnFragmentInteractionListener} interface
 * to handle interaction events.
 *
 */
public class NewsItemSlideshowFragment extends Fragment implements NewsManager.EventListener,
  View.OnClickListener, ViewPager.OnPageChangeListener
{
    private ViewPager viewPager;
    private PagerAdapter adapter;
    private boolean isDraggingViewPager;
    private Timer timer;

    private OnFragmentInteractionListener mListener;

    public NewsItemSlideshowFragment() {
        // Required empty public constructor
    }

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

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View root = inflater.inflate(R.layout.fragment_newsitem_slideshow, container, false);
  viewPager = App.findViewById(root, R.id.view_pager);
  viewPager.setAdapter(adapter = new PagerAdapter() {
      @Override
      public int getCount() {
    return App.news.getItems() == null ? 0 : App.news.getItems().size();
      }

      @Override
      public Object instantiateItem(ViewGroup container, int position) {
    View view = LayoutInflater.from(App.context())
      .inflate(R.layout.slideshow_item, container, false);

    NewsItem item = App.news.getItems().get(position);
    ((TextView)(view.findViewById(R.id.title))).setText(item.getTitle());
    ((TextView)(view.findViewById(R.id.description))).setText(item.getDescription());

    ((ViewPager)container).addView(view, 0);
    view.setOnClickListener(NewsItemSlideshowFragment.this);

    return view;
      }

      @Override
      public void destroyItem(ViewGroup container, int position, Object object) {
    ((ViewPager)container).removeView((View)object);
      }

      @Override
      public boolean isViewFromObject(View view, Object o) {
    return view == o;
      }
  });
  viewPager.setOnPageChangeListener(NewsItemSlideshowFragment.this);

  setupTimerTask();

  return root;
    }

    private void setupTimerTask() {
  long interval = 4000;
  if (timer != null)
      return;
  timer = new Timer(true);
  timer.scheduleAtFixedRate(new TimerTask() {
      @Override
      public void run() {
    final int count = adapter.getCount();
    if (!isDraggingViewPager && count > 0) {
        App.runOnUiThread(new Runnable() {
      public void run() {
          int current = viewPager.getCurrentItem();
          int next = (current + 1) % count;
          viewPager.setCurrentItem(next, true);
      }
        });
    }
      }
  }, interval, interval);
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mListener = (OnFragmentInteractionListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement OnFragmentInteractionListener");
        }

  App.news.addEventListener(this);
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;

  App.news.removeEventListener(this);
    }

    @Override
    public void onPause() {
  super.onPause();
  timer.cancel();
  timer.purge();
  timer = null;
    }

    @Override
    public void onResume() {
  super.onResume();
  setupTimerTask();
    }

    @Override
    public void onEvent(NewsManager.Event e) {
  if (e == NewsManager.Event.REFRESHED_NEWS || e == NewsManager.Event.LOADED_CACHE) {
      adapter.notifyDataSetChanged();
  }
    }

    @Override
    public void onClick(View v) {
  int position = viewPager.getCurrentItem();
  NewsItem item = App.news.getItems().get(position);
  App.news.readItem(item);
  if (mListener != null) {
      mListener.onSlideClick(item.getId());
  }
    }

    @Override
    public void onPageScrolled(int i, float v, int i2) {
    }
    @Override
    public void onPageSelected(int i) {
    }
    @Override
    public void onPageScrollStateChanged(int i) {
  switch (i) {
      case ViewPager.SCROLL_STATE_DRAGGING:
    isDraggingViewPager = true;
    break;
      case ViewPager.SCROLL_STATE_IDLE:
    isDraggingViewPager = false;
    break;
  }
    }

    /**
     * This interface must be implemented by activities that contain this
     * fragment to allow an interaction in this fragment to be communicated
     * to the activity and potentially other fragments contained in that
     * activity.
     * <p>
     * See the Android Training lesson <a href=
     * "http://developer.android.com/training/basics/fragments/communicating.html"
     * >Communicating with Other Fragments</a> for more information.
     */
    public interface OnFragmentInteractionListener {
        public void onSlideClick(String id);
    }
}

Java Source Code List

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