仿知乎日报第十篇：从网络加载首页数据，为首页设置数据

public class HomeBasePage extends BasePage { private Gson mGson; private HomeDataBean mHomeData; private List<HomeLunboData> mLunboDatas = new ArrayList<HomeDataBean.HomeLunboData>(); private List<HomeListViewData> mListViewDatas = newArrayList<HomeDataBean.HomeListViewData>(); private LunboAdapter mLunboAdapter; private int selectedPosition; private ListViewAdapter mListViewAdapter; private BitmapUtils mBitmapUtils; public HomeBasePage(MainActivity mainActivity) { super(mainActivity); // TODO自动生成的构造函数存根 } @Override public void initData(String themeDailyNumber) { // BitmapUtils类专门用来异步从网络加载图片 if (mBitmapUtils == null) { mBitmapUtils = new BitmapUtils(mainActivity); mBitmapUtils.configDefaultBitmapConfig(Config.ARGB_4444); } // 首页显示设置按钮 ibSetting.setVisibility(View.VISIBLE); // 设置首页标题 tvTitle.setText("首页"); // 从网络中加载数据 loadData(); } @Override protected void initListener() { vpLunboPic.setOnPageChangeListener(new OnPageChangeListener() { @Override public void onPageSelected(int position) { // 轮播图1切换，拿到该页面的position，传给成员变量selectedPosition selectedPosition = position; // 为轮播图设置标题并把该页面对应的点从灰色变成白色 setTextAndSelectPoint(); } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { // TODO自动生成的方法存根 } @Override public void onPageScrollStateChanged(int arg0) { // TODO自动生成的方法存根 } }); // ListView的item1点击，带着该item的文章id去ArticleActivity lvNews.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // 由于ListView有个头布局，而头布局的position为0，头布局不是文章item，所以position != 0 if (position != 0) { String url = MyContants.BASEARTICLESTRING + mHomeData.stories.get(position⑴).id; Intent intent = new Intent(mainActivity,ArticleActivity.class); intent.putExtra("articleUrl", url); mainActivity.startActivity(intent); } } }); super.initListener(); } private void loadData() { mLunboAdapter = new LunboAdapter(); // 为轮播图的ViewPager设置Adapter vpLunboPic.setAdapter(mLunboAdapter); mListViewAdapter = new ListViewAdapter(); // 为ListView设置Adapter lvNews.setAdapter(mListViewAdapter); // 先从SharedPreference里面拿json数据 String jsonCache = SpTools.getString(mainActivity, MyContants.HOMELATEST, ""); // 如果数据存在，直接去解析Json数据 if (!TextUtils.isEmpty(jsonCache)) { // System.out.println(jsonCache); parseData(jsonCache); } HttpUtils httpUtils = new HttpUtils(); // 用HttpUtils异步从网络获得数据 // 第1个参数：get方式获得数据 // 第2个参数：url地址 // 第3个参数：回调对象，获得数据成功或获得数据失败后调用 httpUtils.send(HttpMethod.GET, MyContants.HOMELATEST, new RequestCallBack<String>() { @Override public void onSuccess(ResponseInfo<String> responseInfo) { // 获得数据成功后，拿到json数据 String homeJsonData = responseInfo.result; // 这里做1个缓存，把json数据保存到SharedPreference里面 SpTools.putString(mainActivity,MyContants.HOMELATEST, homeJsonData); // System.out.println("Data" +homeJsonData); if (!TextUtils.isEmpty(homeJsonData) ) { parseData(homeJsonData); } } @Override public void onFailure(HttpException error, String msg) { // TODO自动生成的方法存根 } }); } private void parseData(String homeJsonData) { // 创建Gson对象，这个对象只要有1个就能够了，所以只有为空的时候才创建 if (mGson == null) { mGson = new Gson(); } // 用Gson解析数据 mHomeData = mGson.fromJson(homeJsonData, HomeDataBean.class); //System.out.println(mHomeData.stories.get(0).images.get(0)); // 处理数据 processData(); } private void processData() { // 1.给ViewPager数据 setLunboData(); // 2.初始化点 initLunboPoints(); // 3.设置标题及点的选中 setTextAndSelectPoint(); // 4.为ListView设置数据 setListViewData(); } private void setListViewData() { // 为ListView设置数据 mListViewDatas = mHomeData.stories; } private class ListViewAdapter extends BaseAdapter { @Override public int getCount() { return mListViewDatas.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroupparent) { ViewHolder viewHolder; if (convertView == null) { // 加载ListView的item的布局 convertView = View.inflate(mainActivity, R.layout.list_item, null); viewHolder = new ViewHolder(); // 拿到item里面的各个组件 viewHolder.textView = (TextView) convertView .findViewById(R.id.tv_list_item_title); viewHolder.imageView = (ImageView) convertView .findViewById(R.id.iv_list_item_image); convertView.setTag(viewHolder); } else { viewHolder = (ViewHolder) convertView.getTag(); } // 为item里面的TextView组件设置标题 viewHolder.textView.setText(mListViewDatas.get(position).title); // 为item里面的ImageView组件设置图片，还是用BitmapUtils异步加载 String listImageUrl = mListViewDatas.get(position).images.get(0); if (!TextUtils.isEmpty(listImageUrl)) { mBitmapUtils.display(viewHolder.imageView, listImageUrl); } else { viewHolder.imageView.setVisibility(View.GONE); } return convertView; } } private class ViewHolder { TextView textView; ImageView imageView; } private voidsetTextAndSelectPoint() { // 设置轮播图的标题 tvLunboTitle.setText(mHomeData.top_stories.get(selectedPosition).title); // 遍历，轮播图的setOnPageChangeListener的onPageChange方法中拿到了当前的页面的position， // 并把它传给selectedPosition，如果i为selectedPosition，则把点设为白点 for (int i = 0; i < mLunboDatas.size(); i++) { llLunboPoints.getChildAt(i).setEnabled(i == selectedPosition); } } private void initLunboPoints() { // 先移除轮播图下面所有的点 llLunboPoints.removeAllViews(); // 遍历轮播图的数量，即有多少轮播图，就创建几个点 for (int i = 0; i < mLunboDatas.size(); i++) { View view = new View(mainActivity); // 为View设置背景，背景为1个选择器，state_enabled为true的时候为白点，为false的时候为灰点 view.setBackgroundResource(R.drawable.selector_lunbo_points); // 默许都设为灰色点 view.setEnabled(false); // 为点View创建LayoutParams，里面传入的参数是px // 所以我们创建了1个工具类DensityUtil的dip2px()方法将density单位转为像素单位px LayoutParams layoutParams = new LayoutParams(DensityUtil.dip2px( mainActivity, 5), DensityUtil.dip2px(mainActivity, 5)); // 为点View设置左侧边距 layoutParams.leftMargin = DensityUtil.dip2px(mainActivity, 5); // 为点View设置LayoutParams view.setLayoutParams(layoutParams); // 把点加进LinearLayout llLunboPoints.addView(view); } } private class LunboAdapter extends PagerAdapter { @Override public int getCount() { return mLunboDatas.size(); } @Override public boolean isViewFromObject(View arg0, Object arg1) { // TODO自动生成的方法存根 return arg0 == arg1; } @Override public void destroyItem(ViewGroup container, int position, Objectobject) { container.removeView((View) object); } @Override public Object instantiateItem(ViewGroup container, int position) { // 轮播图的每页页面都是1个ImageView ImageView imageView = new ImageView(mainActivity); // ImageView上面的图片x轴，y轴上都拉伸 imageView.setScaleType(ScaleType.FIT_XY); // 用BitmapUtills从网上异步加载图片，并放在ImageView容器中 // 第1个参数为容器 // 第2个参数为url mBitmapUtils.display(imageView, mHomeData.top_stories.get(position).image); // 轮播图的ImageView1点击，带着该轮播图页面的文章id去ArticleActivity imageView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String url = MyContants.BASEARTICLESTRING + mHomeData.top_stories.get(vpLunboPic.getCurrentItem()).id; Intent intent = new Intent(mainActivity,ArticleActivity.class); intent.putExtra("articleUrl", url); mainActivity.startActivity(intent); } }); container.addView(imageView); return imageView; } } private void setLunboData() { // 拿到轮播图的数据 mLunboDatas = mHomeData.top_stories; // 更新轮播图的展现 mLunboAdapter.notifyDataSetChanged(); } }

public class HomeDataBean { public String date; public List<HomeListViewData> stories; public List<HomeLunboData> top_stories; // ListView的数据 public class HomeListViewData { public String ga_prefix; public String id; public List<String> images; public String title; public String type; public String multipic; } // 轮播图的数据 public class HomeLunboData { public String ga_prefix; public String id; public String image; public String title; public String type; } }

if (mGson == null) { mGson = new Gson(); } mHomeData = mGson.fromJson(homeJsonData, HomeDataBean.class);