PictureFragment.java

package lee.devis.joker;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.nostra13.universalimageloader.core.ImageLoader;

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

import lee.devis.joker.Entity.Joke;
import lee.devis.joker.Entity.Result;
import lee.devis.joker.HttpMethod.AsynTaskThread;
import lee.devis.joker.adapter.JokeListViewAdapter;
import lee.devis.joker.zrcrefreshview.SimpleFooter;
import lee.devis.joker.zrcrefreshview.SimpleHeader;
import lee.devis.joker.zrcrefreshview.ZrcListView;

import static lee.devis.joker.zrcrefreshview.ZrcListView.OnStartListener;


public class PictureFragment extends BaseFragment {


    private OnFragmentInteractionListener mListener;

    private ZrcListView listView;
    private Handler handler;
    private JokeListViewAdapter adapter;

    private List<Joke> jokes;
    private int currentPage = 1;

    private ImageLoader imageLoader;

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

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

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        Log.i("TTT", "Fragment onCreateView");
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_newest, container, false);

        listView = (ZrcListView) view.findViewById(R.id.zListView);
        handler = new Handler();

        imageLoader = ImageLoader.getInstance();
        // 设置默认偏移量，主要用于实现透明标题栏功能。
//        float density = getResources().getDisplayMetrics().density;
//        listView.setFirstTopOffset((int) (50 * density));

        // 设置下拉刷新的样式
        SimpleHeader header = new SimpleHeader(getActivity());
        header.setTextColor(0xff0066aa);
        header.setCircleColor(0xff33bbee);
        listView.setHeadable(header);

        // 设置加载更多的样式
        SimpleFooter footer = new SimpleFooter(getActivity());
        footer.setCircleColor(0xff33bbee);
        listView.setFootable(footer);

        // 设置列表项出现动画
        listView.setItemAnimForTopIn(R.anim.topitem_in);
        listView.setItemAnimForBottomIn(R.anim.bottomitem_in);

        // 下拉刷新事件回调
        listView.setOnRefreshStartListener(new OnStartListener() {

            @Override
            public void onStart() {
                refresh();
            }
        });

        // 加载更多事件回调
        listView.setOnLoadMoreStartListener(new OnStartListener() {
            @Override
            public void onStart() {
                loadMore();
            }
        });

//        listView.setOnScrollListener(new PauseOnScrollListener(imageLoader, true, true));

        // Bug，当ZListView为没有数据时，无法下位刷新。建议当无数据的加载使用loading界面、无数据界面。
        jokes = new ArrayList<Joke>();
        Joke joke = new Joke();
        jokes.add(joke);

        adapter = new JokeListViewAdapter(getActivity(), jokes);
        listView.setAdapter(adapter);
        listView.refresh(); // 主动下拉刷新

        return view;
    }

    private Handler myHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case R.id.tag_get_picture:
                    Log.i("TTT", "myHandler  tag_get_picture");
                    Result result = (Result) msg.obj;
                    if (result != null) {
                        List<Joke> list = (List<Joke>) result.getItems();
                        if (list != null && list.size() > 0) {
                            if (currentPage == 1) {
                                jokes.clear();
                            }
                            jokes.addAll(list);
                            adapter.notifyDataSetChanged();
                            listView.setRefreshSuccess("刚刚更新"); // 通知加载成功
                            listView.startLoadMore(); // 开启LoadingMore功能
                        } else {
                            Log.e("TTT", "error myHandler1");
                            jokes.add(new Joke());
                            adapter.notifyDataSetChanged();
                            listView.setRefreshFail("没有更新");
                        }
                    } else {
                        Log.e("TTT", "error myHandler2");
                        jokes.add(new Joke());
                        adapter.notifyDataSetChanged();
                        listView.setRefreshFail("更新失败");
                    }
                    break;
                default:
                    break;
            }
        }
    };

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

    @Override
    public void onDetach() {
        super.onDetach();
        if (mListener != null) mListener = null;
        if (handler != null) handler.removeCallbacksAndMessages(handler);
    }

    @Override
    public void onDestroyView() {
        if (jokes != null) {
            jokes.clear();
            if (adapter != null && listView != null) {
                adapter.notifyDataSetChanged();
                listView = null;
                adapter = null;
            }
        }
        if (myHandler != null) {
            myHandler.removeCallbacksAndMessages(myHandler);
            myHandler = null;
        }
        if (handler != null) {
            handler.removeCallbacksAndMessages(myHandler);
            handler = null;
        }
        super.onDestroyView();
    }


    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        public void onFragmentInteraction(Uri uri);
    }

    private void refresh() {
        jokes.clear();
        currentPage = 1;
        new AsynTaskThread(myHandler, R.id.tag_get_picture, currentPage).execute();
    }

    private void loadMore() {
        new AsynTaskThread(myHandler, R.id.tag_get_picture, ++currentPage).execute();
    }


}