android124 zhihuibeijing 新闻中心-组图

package com.itheima.zhbj52.base.menudetail;

import java.util.ArrayList;

import android.app.Activity;
import android.text.TextUtils;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.google.gson.Gson;
import com.itheima.zhbj52.R;
import com.itheima.zhbj52.base.BaseMenuDetailPager;
import com.itheima.zhbj52.domain.PhotosData;
import com.itheima.zhbj52.domain.PhotosData.PhotoInfo;
import com.itheima.zhbj52.domain.PhotosData.PhotosInfo;
import com.itheima.zhbj52.global.GlobalContants;
import com.itheima.zhbj52.utils.CacheUtils;
import com.lidroid.xutils.BitmapUtils;
import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;
import com.lidroid.xutils.http.client.HttpRequest.HttpMethod;

/**
 * 新闻中心-组图
 */
public class PhotoMenuDetailPager extends BaseMenuDetailPager {
    /*public abstract class BaseMenuDetailPager {
        public Activity mActivity;
        public View mRootView;// 根布局对象
        public BaseMenuDetailPager(Activity activity) {
            mActivity = activity;
            mRootView = initViews();
        }
        public abstract View initViews();
        public void initData() {
        }
    }*/

    private ListView lvPhoto;
    private GridView gvPhoto;
    private ArrayList<PhotoInfo> mPhotoList;
    private PhotoAdapter mAdapter;
    private ImageButton btnPhoto;

    public PhotoMenuDetailPager(Activity activity, ImageButton btnPhoto) {//btnPhoto对象通过构造函数传过来。
        super(activity);
        this.btnPhoto = btnPhoto;
        btnPhoto.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                changeDisplay();
            }
        });
    }

    @Override
    public View initViews() {
        View view = View.inflate(mActivity, R.layout.menu_photo_pager, null);
        //menu_photo_pager.xml
        /*<?xml version="1.0" encoding="utf-8"?>
        <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >
            <ListView
                android:id="@+id/lv_photo"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:cacheColorHint="#fff"           背景色为白色
                android:divider="@null" />              没有分割线
            <GridView
                android:id="@+id/gv_photo"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:numColumns="2"                     设置为2列
                android:visibility="gone" />               默认隐藏。点击可以切换用ListView或者GridView。
        </FrameLayout>*/

        lvPhoto = (ListView) view.findViewById(R.id.lv_photo);
        gvPhoto = (GridView) view.findViewById(R.id.gv_photo);
        return view;
    }

    @Override
    public void initData() {
        String cache = CacheUtils
                .getCache(GlobalContants.PHOTOS_URL, mActivity);
        //PHOTOS_URL = "http://10.0.2.2:8080/zhbj/photos/photos_1.json";
        if (!TextUtils.isEmpty(cache)) {
        }
        getDataFromServer();
    }

    private void getDataFromServer() {
        HttpUtils utils = new HttpUtils();
        utils.send(HttpMethod.GET, GlobalContants.PHOTOS_URL,
                new RequestCallBack<String>() {
                    @Override
                    public void onSuccess(ResponseInfo<String> responseInfo) {
                        String result = (String) responseInfo.result;
                        parseData(result);
                        // 设置缓存
                        CacheUtils.setCache(GlobalContants.PHOTOS_URL, result,
                                mActivity);
                    }

                    @Override
                    public void onFailure(HttpException error, String msg) {
                        Toast.makeText(mActivity, msg, Toast.LENGTH_SHORT)
                                .show();
                        error.printStackTrace();
                    }
                });
    }

    protected void parseData(String result) {
        Gson gson = new Gson();
        PhotosData data = gson.fromJson(result, PhotosData.class);
        /*public class PhotosData {
            public int retcode;
            public PhotosInfo data;
            public class PhotosInfo {
                public String title;
                public ArrayList<PhotoInfo> news;
            }
            public class PhotoInfo {
                public String id;
                public String listimage;
                public String pubdate;
                public String title;
                public String type;
                public String url;
            }
        }*/
        mPhotoList = data.data.news;// 获取组图列表集合

        if (mPhotoList != null) {
            mAdapter = new PhotoAdapter();
            lvPhoto.setAdapter(mAdapter);//使用同一个mAdapter
            gvPhoto.setAdapter(mAdapter);
        }
    }

    class PhotoAdapter extends BaseAdapter {

        private BitmapUtils utils;

        public PhotoAdapter() {
            utils = new BitmapUtils(mActivity);
            utils.configDefaultLoadingImage(R.drawable.news_pic_default);//默认加载图片
        }

        @Override
        public int getCount() {
            return mPhotoList.size();
        }

        @Override
        public PhotoInfo getItem(int position) {
            return mPhotoList.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder;
            if (convertView == null) {
                convertView = View.inflate(mActivity, R.layout.list_photo_item,null);
                /*<?xml version="1.0" encoding="utf-8"?>
                <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical" >
                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_margin="10dp"
                        android:background="@drawable/pic_list_item_bg"
                        android:gravity="center"
                        android:orientation="vertical" >
                        <ImageView
                            android:id="@+id/iv_pic"
                            android:layout_width="match_parent"
                            android:layout_height="180dp"
                            android:scaleType="centerCrop"
                            android:src="@drawable/news_pic_default" />
                        <TextView
                            android:id="@+id/tv_title"
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:padding="10dp"
                            android:text="标题"
                            android:singleLine="true"
                            android:textColor="#000"
                            android:textSize="22sp" />
                    </LinearLayout>
                </LinearLayout>*/
                holder = new ViewHolder();
                holder.tvTitle = (TextView) convertView.findViewById(R.id.tv_title);
                holder.ivPic = (ImageView) convertView.findViewById(R.id.iv_pic);

                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }
            PhotoInfo item = getItem(position);
            holder.tvTitle.setText(item.title);
            utils.display(holder.ivPic, item.listimage);//加载图片，默认BitmapUtils对图片提供了缓存。
            return convertView;
        }

    }

    static class ViewHolder {
        public TextView tvTitle;
        public ImageView ivPic;
    }

    private boolean isListDisplay = true;// 是否是列表展示

    /**
     * 切换展现方式
     */
    private void changeDisplay() {
        if (isListDisplay) {
            isListDisplay = false;
            lvPhoto.setVisibility(View.GONE);
            gvPhoto.setVisibility(View.VISIBLE);

            btnPhoto.setImageResource(R.drawable.icon_pic_list_type);

        } else {
            isListDisplay = true;
            lvPhoto.setVisibility(View.VISIBLE);
            gvPhoto.setVisibility(View.GONE);

            btnPhoto.setImageResource(R.drawable.icon_pic_grid_type);
        }
    }
}