CardFragment.java

package jianshu.io.app.fragment;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import net.tsz.afinal.FinalBitmap;

import it.gmariotti.cardslib.library.internal.Card;
import jianshu.io.app.ArticleActivity;
import jianshu.io.app.R;
import jianshu.io.app.adapter.JianshuCardArrayAdapter;
import jianshu.io.app.card.HomeCard;
import jianshu.io.app.card.HotCard;
import jianshu.io.app.card.JianshuBaseCard;
import jianshu.io.app.model.ArticleItem;
import jianshu.io.app.model.JianshuSession;
import jianshu.io.app.model.StatePool;
import jianshu.io.app.model.datapool.DataPool;
import jianshu.io.app.util.DataPoolAsyncTask;
import jianshu.io.app.widget.EndlessCardListView;
import jianshu.io.app.widget.EndlessListener;
import jianshu.io.app.widget.LoadingTextView;

/**
 * Created by Administrator on 2014/5/7.
 */
public class CardFragment extends Fragment implements SwipeRefreshLayout.OnRefreshListener, EndlessListener, JianshuCardArrayAdapter.CardClickListener {

  public static CardFragment newInstance(String url) {
    CardFragment fragment = new CardFragment();
    Bundle bundle = new Bundle();
    bundle.putString("url", url);
    fragment.setArguments(bundle);
    return fragment;
  }

  FinalBitmap fb;
  EndlessCardListView mContentView;
  SwipeRefreshLayout mRefreshLayout;
  JianshuCardArrayAdapter mAdapter;
  LoadingTextView mFooter;
  DataPool mPool;
  View mEmptyView;
  boolean mIsEmpty;
  String mUrl;
  int[] mListViewState;

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = getActivity().getLayoutInflater().inflate(R.layout.hot, null);

    final Activity activity = getActivity();
    this.fb = FinalBitmap.create(activity);

    mUrl = getArguments().getString("url");
    Object[] states = StatePool.getInstance().getFragmentState(getActivity(), mUrl);
    mPool = (DataPool) states[0];
    mAdapter = (JianshuCardArrayAdapter) states[1];
    mAdapter.setCardClickListener(this);
    if (states[2] != null) {
      mListViewState = (int[]) states[2];
    }

    mEmptyView = getActivity().getLayoutInflater().inflate(R.layout.empty_pull, null);
    mContentView = (EndlessCardListView) (view.findViewById(R.id.hotlist));
    mContentView.setListener(this);
    mFooter = (LoadingTextView) activity.getLayoutInflater().inflate(R.layout.footer, null);
    mContentView.setFooter(mFooter);
    mContentView.setAdapter(mAdapter);

    mRefreshLayout = (SwipeRefreshLayout) (view.findViewById(R.id.ptr_layout));
    mRefreshLayout.setColorScheme(R.color.jianshu, R.color.card_list_gray, R.color.jianshu, R.color.card_list_gray);
    mRefreshLayout.setOnRefreshListener(this);

    return view;
  }

  @Override
  public void onViewStateRestored(Bundle savedInstanceState) {
    super.onViewStateRestored(savedInstanceState);
    if (mListViewState != null) {
      mContentView.setSelectionFromTop(mListViewState[0], mListViewState[1]);
    }
  }

  @Override
  public void onResume() {
    super.onResume();
    //判断userInfo是否有变化
    boolean isUserInfoChanged = true;
    String cachedSession = mAdapter.getSession();
    String currentSession = JianshuSession.getsInstance().getSession();
    if((currentSession == null && cachedSession == null) ||
        ((currentSession != null && cachedSession != null) && currentSession.equals(cachedSession))) {
      isUserInfoChanged = false;
    }
    mAdapter.setSession(currentSession);

    if (isUserInfoChanged || mAdapter.getCount() == 0) {
      mRefreshLayout.setRefreshing(true);
      onRefresh();
    } else {
      mAdapter.notifyDataSetChanged();
    }
  }

  @Override
  public void onPause() {
    super.onPause();
    int index = mContentView.getFirstVisiblePosition();
    View v = mContentView.getChildAt(0);
    int top = (v == null) ? 0 : v.getTop();
    StatePool.getInstance().putListViewState(mUrl, new int[]{index, top});
  }

  private Card[] initCard(final Context context, Object[] data) {
    Card[] result = new Card[data.length];
    int i = 0;
    for (Object temp : data) {
      ArticleItem item = (ArticleItem)temp;
      final JianshuBaseCard card;
      String summary = item.getSummary();
      if (summary != null && summary.length() > 0) {
        card = new HomeCard(context, item, this.fb);
//        CardHeader header = new HotCardHeader(context);
//        header.setTitle(item.getTitle());
//        card.addCardHeader(header);
//        HotCardExpand expand = new HotCardExpand(context);
//        expand.setSummary(item.getSummary());
//        card.addCardExpand(expand);
      } else {
        card = new HotCard(context, item, this.fb);
      }
      result[i++] = card;
      card.addPartialOnClickListener(Card.CLICK_LISTENER_CONTENT_VIEW, new Card.OnCardClickListener() {
        @Override
        public void onClick(Card card, View view) {
          mAdapter.onClick(card);
        }
      });
    }
    return result;
  }

  @Override
  public void onRefresh() {
    new DataPoolAsyncTask(true, this.mPool, new DataPoolAsyncTask.OnPostExecuteTask() {
          @Override
          public void run(Exception e, Object[] data) {
            mRefreshLayout.setRefreshing(false);
            Context context = getActivity();
            if (context == null) {
          return;
        }
        if (data != null) {
          if (mIsEmpty) {
            mIsEmpty = false;
            mRefreshLayout.removeView(mEmptyView);
            mRefreshLayout.addView(mContentView);
          } else {
            mAdapter.clear();
          }
          mAdapter.addAll(initCard(context, data));
        } else {
          if (context != null) {
            Toast.makeText(context, ":( 加载失败，请重试", Toast.LENGTH_LONG).show();
          }
          if (mAdapter.getCount() == 0 && !mIsEmpty) {
            mIsEmpty = true;
            mRefreshLayout.removeView(mContentView);
            mRefreshLayout.addView(mEmptyView);
          }
        }
      }
    }).execute();
  }

  @Override
  public boolean isAtTheEnd() {
    return mPool.isAtTheEnd();
  }

  @Override
  public void onScrollEnd() {
    mFooter.startAnimation();
    new DataPoolAsyncTask(false, this.mPool, new DataPoolAsyncTask.OnPostExecuteTask() {
      @Override
      public void run(Exception e, Object[] data) {
        mFooter.endAnimation();
        mContentView.notifyNewDataLoaded();
        Context context = getActivity();
        if (context == null) {
          return;
        }
        if (data != null) {
          mAdapter.addAll(initCard(context, data));
        } else {
          Toast.makeText(context, ":( 加载失败，请重试", Toast.LENGTH_LONG).show();
        }
      }
    }).execute();
  }

  @Override
  public void onClick(Card card) {
    Context context = getActivity();
    ArticleItem item = ((JianshuBaseCard) card).getItem();
    Intent intent = new Intent(context, ArticleActivity.class);
    intent.putExtra("url", item.getUrl());
    intent.putExtra("title", item.getTitle());
    intent.putExtra("summary", item.getSummary());
    intent.putExtra("author", item.getAuthor());
    getActivity().startActivity(intent);
    getActivity().overridePendingTransition(R.anim.slide_in_left, 0);
  }

  public interface HotFragmentListner {
    void onRefreshStart();

    void onRefreshEnd();
  }
}