ChildTwoFragment.java

package com.wangbb.naruto.app.fragment.childFragment;

import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.wangbb.naruto.R;
import com.wangbb.naruto.app.activity.MainActivity;
import com.wangbb.naruto.app.adapter.ChildOneAdapter;
import com.wangbb.naruto.app.fragment.BaseFragment;
import com.wangbb.naruto.app.view.LoadingViewHelper;
import com.wangbb.naruto.utils.Utility;

import java.util.ArrayList;

/**
 * Created by wangbinbin on 15/5/9.
 */
public class ChildTwoFragment extends BaseFragment {
    private RecyclerView mRecyclerView;
    private ArrayList<String> list;
    private SwipeRefreshLayout mSwipeRefreshLayout;
    private LinearLayoutManager mLayoutManager;
    private boolean canLoadMore = true;
    private LoadingViewHelper loadingView;
    private View view;
    private MainActivity mainActivity;
    private ChildOneAdapter adapter;

    private boolean isLoadingData = false;
    private boolean isInitData = false;
    private int page = 1;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.fragment_child_two, container, false);
        initView();
        setListerner();
        return view;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        this.mainActivity = (MainActivity) getActivity();

        mSwipeRefreshLayout.setRefreshing(true);
        if (adapter == null) {
            if (list == null)
                list = new ArrayList<String>();
            adapter = new ChildOneAdapter(mainActivity, list);
            mRecyclerView.setAdapter(adapter);
        }

        mSwipeRefreshLayout.setRefreshing(false);
    }

    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);

        if (!isInitData && isVisibleToUser) {
            initData();
            isInitData = true;
        }
    }

    private void initView() {
        mSwipeRefreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.swiperefreshlayout);
        mSwipeRefreshLayout.setColorSchemeColors(Color.RED, Color.BLUE, Color.YELLOW);
//        mSwipeRefreshLayout.setProgressBackgroundColor(R.color.primary_dark_material_dark);
        mSwipeRefreshLayout.setProgressViewOffset(false, Utility.dip2px(0), Utility.dip2px(80));
        mSwipeRefreshLayout.setHorizontalFadingEdgeEnabled(true);
        mSwipeRefreshLayout.setHapticFeedbackEnabled(true);
        mSwipeRefreshLayout.setHasTransientState(true);
        mSwipeRefreshLayout.setHovered(true);

        mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerview);
        //�������ȷ��ÿ��item�ĸ߶��ǹ̶��ģ��������ѡ������������
        mRecyclerView.setHasFixedSize(false);

        mLayoutManager = new LinearLayoutManager(mainActivity);
        mRecyclerView.setLayoutManager(mLayoutManager);

        loadingView = new LoadingViewHelper(view.findViewById(R.id.loading_view));
    }

    private void setListerner() {
        mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                if (mRecyclerView != null && mRecyclerView.getAdapter() != null)
                    mRecyclerView.getAdapter().notifyDataSetChanged();
                mSwipeRefreshLayout.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        page = 1;
                        list.clear();
                        initData();
                        mSwipeRefreshLayout.setRefreshing(false);
                    }
                }, 2000);
            }
        });

        mRecyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {

            }

            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                int lastVisibleItem = mLayoutManager.findLastVisibleItemPosition();
                int totalItemCount = mLayoutManager.getItemCount();
                //lastVisibleItem >= totalItemCount - 4 ��ʾʣ��4��item�Զ����أ���λ����ѡ�� dy>0 ��ʾ���»���
                if (!isLoadingData && lastVisibleItem >= totalItemCount - 2 && dy > 0) {
                    isLoadingData = true;
                    mRecyclerView.postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            page++;
                            initData();
                            mRecyclerView.getAdapter().notifyDataSetChanged();
                        }
                    }, 2000l);
                }
            }
        });
    }

    protected void initData() {
        isLoadingData = false;

        if (list == null)
            list = new ArrayList<String>();
        for (int i = 'A'; i < 'J'; i++) {
            list.add((char) i + " page = " + page);
        }

        if (mRecyclerView != null && mRecyclerView.getAdapter() != null)
            mRecyclerView.getAdapter().notifyDataSetChanged();
    }
}