package com.bob.digcsdn.fragments;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ProgressBar;
import android.widget.Toast;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.bob.digcsdn.R;
import com.bob.digcsdn.BlogDetailActivity;
import com.bob.digcsdn.adapters.BlogListAdapter;
import com.bob.digcsdn.adapters.TabPagerAdapter;
import com.bob.digcsdn.models.BlogItem;
import com.bob.digcsdn.models.Page;
import com.bob.digcsdn.db.BlogService;
import com.bob.digcsdn.interfaces.JsonCallBackListener;
import com.bob.digcsdn.utils.Constants;
import com.bob.digcsdn.utils.JsoupUtil;
import com.bob.digcsdn.utils.LogUtil;
import com.bob.digcsdn.utils.UrlUtil;
import com.bob.digcsdn.utils.VolleyUtil;
import com.bob.digcsdn.view.LoadMoreListView;
import java.util.List;
/**
* Created by bob on 15-4-21.
*/
@SuppressLint("ValidFragment")
public class BlogFragment extends Fragment implements SwipeRefreshLayout.OnRefreshListener, LoadMoreListView.OnLoadMoreListener {
private int blogType = 0;//默认的是首页
private boolean isLoad = false;//是否已经被加载过了
private Boolean canLoadMore = true;
private View noBlogLayout;//无数据显示
private ProgressBar progressBar;//进度条预览
private SwipeRefreshLayout swipeLayout; //系统带的下拉刷新控件
private LoadMoreListView blogListView; //具有上拉加载的ListView
private BlogListAdapter adapter; //数据适配器
private BlogService blogService;//博客数据库服务
public static Page page;//有甚叼用暂时未知！！！浏览器的博客列表是分页显示的
public BlogFragment(int blogType) {
this.blogType = blogType;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
init();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.blog_main, container, false);//最后一项为是否有父布局，设为false
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
initWidget();//初始化控件
if (!isLoad) {
LogUtil.i("flag", "into " + TabPagerAdapter.TITLE[blogType]);
isLoad = true;
/**
* 这里只需要在第一次进入的时候访问网络加载数据即可，二次回来的时候，成员变量不会被销毁
* 因此adapter只要保存完好，数据就不会丢失
*/
adapter.setList(blogService.loadBlog(blogType));
onRefresh();
} else {
LogUtil.i("back", "into " + blogType);
blogListView.setCanLoadMore(canLoadMore);
progressBar.setVisibility(View.INVISIBLE);
if (blogService.loadBlog(blogType).size() == 0) {
noBlogLayout.setVisibility(View.VISIBLE);//恢复noBlogLayout应有的状态
}
}
}
private void init() {
blogService = BlogService.getInstance(getActivity());
adapter = new BlogListAdapter(getActivity());
page = new Page();
page.setPageStart();//从第二页开始
}
private void initWidget() {
progressBar = (ProgressBar) getView().findViewById(R.id.pro_common_content);
swipeLayout = (SwipeRefreshLayout) getView().findViewById(R.id.swipe_refresh);
swipeLayout.setOnRefreshListener(this);//下拉组件的事件监听
// set style for swipeRefreshLayout
swipeLayout.setColorSchemeResources(android.R.color.holo_red_light, android.R.color.holo_green_light,
android.R.color.holo_blue_bright);
blogListView = (LoadMoreListView) getView().findViewById(R.id.list_view);
blogListView.setOnLoadMoreListener(this);//为listView添加加载监听
blogListView.setAdapter(adapter);//设置数据适配器
blogListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (position == adapter.getCount()) {
Toast.makeText(getActivity(), "再点割 jj！！！", Toast.LENGTH_SHORT).show();
} else {
BlogItem blogItem = (BlogItem) adapter.getItem(position);//获取博客对象
Intent intent = new Intent(getActivity(), BlogDetailActivity.class);
intent.putExtra("blogLink", blogItem.getLink());
intent.putExtra("blogTitle", blogItem.getTitle());
startActivity(intent);
/**
* 用于设置当前活动出现或者退出的动画，放在startActivity和finish之后
*/
getActivity().overridePendingTransition(R.anim.push_left_in, R.anim.push_no);
}
}
});
noBlogLayout = getView().findViewById(R.id.ll_noBlog);
}
public void executeTask(String url, final int taskType) {
StringRequest htmlRequest = new StringRequest(url, new Response.Listener<String>() {
@Override
public void onResponse(String html) {//主线程里
progressBar.setVisibility(View.INVISIBLE);
noBlogLayout.setVisibility(View.INVISIBLE);
JsoupUtil.getBlogItemList(blogType, html, new JsonCallBackListener() {
@Override
public void onFinish(final List<BlogItem> list) {//子线程里，就这样把部分操作放到子线程里？？？
if (taskType == Constants.DEF_TASK_TYPE.REFRESH) {
/**
* 既然放到子线程里了，就应该注意线程同步安全的问题
*/
adapter.setList(list);//将listView里的数据重置为解析得到的list
blogService.delete(blogType);//先删除库中已有的博客内容
blogService.insert(adapter.getList());//存库
}
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {//主线程里，也可以使用handler的post方法来切换到主线程中作业
if (list.size() == 0 || list.size() > 20) {//重复或者空列表，则停止加载
blogListView.setCanLoadMore(false);//停止加载
list.clear();
canLoadMore= false;
}
if (taskType == Constants.DEF_TASK_TYPE.REFRESH) {//刷新,这里只会存上第一页的博客，因为在加载的时候，并没有存库
blogListView.setCanLoadMore(true);
adapter.notifyDataSetChanged();
swipeLayout.setRefreshing(false);//刷新完毕，停止刷新动画
if (adapter.getCount() == 0)
noBlogLayout.setVisibility(View.VISIBLE);
} else {//加载
/**
* 在主页中加载超页之后，不再分页显示,分页的时候按照每页15条显示
*/
LogUtil.i("加载的数量", list.size() + "");
if (list.size() <= 20) {
adapter.addList(list);
adapter.notifyDataSetChanged();
}
blogListView.onLoadMoreComplete();//本次加载完毕
page.addPage();//加载完毕后指向下一页
}
}
});
}
});//Jsoup解析html
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
Toast.makeText(getActivity(), "网络信号不佳", Toast.LENGTH_SHORT).show();
blogListView.onLoadMoreComplete();
swipeLayout.setRefreshing(false);
progressBar.setVisibility(View.INVISIBLE);
}
});
VolleyUtil.getQueue().add(htmlRequest);//队列里肯定是按顺序执行的，也不用担心多线程访问的线程安全问题
}
@Override
public void onRefresh() {//刷新监听
page.setPageStart();//默认从第二页开始
executeTask(UrlUtil.getRefreshBlogListURL(blogType), Constants.DEF_TASK_TYPE.REFRESH);
}
@Override
public void onLoadMore() {//加载监听
Log.i("refreshitem", blogType + " " + page.getCurrentPage());
executeTask(UrlUtil.getBlogListURL(blogType, page.getCurrentPage()), Constants.DEF_TASK_TYPE.LOAD);
}
}