多条目展示

public class NetUtil {

//联网操作
public static boolean isNetworkConnected(Context context) {
if (context != null) {
// 获取网络管理类
ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
// 获取网络信息类
NetworkInfo networkInfo = manager.getActiveNetworkInfo();
// 如果没有插卡，或wifi没有连接 就获取不到networkinfo
if (networkInfo != null) {
// 返回网络是否可用
return networkInfo.isAvailable();
}
}
return false;
}
//判断网络请求

public static String getDataFromServer(String url){
    HttpURLConnection connection = null;
    try {
        URL url1 = new URL(url);
        connection = (HttpURLConnection) url1.openConnection();

        connection.setRequestMethod("GET");
        connection.setConnectTimeout(5000);
        connection.setReadTimeout(5000);

        if(connection.getResponseCode() == 200){
            return CharStreams.toString(new InputStreamReader(connection.getInputStream()));
        }

    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

}

//联网展示图片
public class ShouYeFragment extends Fragment {
private String server_url=“http://gank.io/api/data/iOS/20/2”;
private View rootView;
private ListView homelist;

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    rootView = inflater.inflate(R.layout.fragment_fragment_home,null);

    initView();

    loadData();
    return rootView;
}

//加载数据
private void loadData() {
new LoadDataTask().execute(server_url);
}

private void initView() {
    homelist = rootView.findViewById(R.id.home_list);
}
class LoadDataTask extends AsyncTask<String,Void,String>{

    @Override
    protected void onPostExecute(String s) {
        Gson gson = new Gson();

        Result result = gson.fromJson(s, Result.class);
        homelist.setAdapter(new HomeAdapter(getContext(),result.getResults()));
    }

    @Override
    protected String doInBackground(String... strings) {

        return NetUtil.getDataFromServer(strings[0]);
    }
}

}
//Adapter
多条目展示
public class HomeAdapter extends BaseAdapter {

private Context context;
private List<Result.ResultsEntity> datas;

private final int ITEM_VIEW_TYPE_ONE = 0;

private final int ITEM_VIEW_TYPE_TWO = 1;

private final int ITEM_VIEW_TYPE_THERE = 2;

private final int ITEM_VIEW_TYPE_COUNT = 4;

public HomeAdapter(Context context, List<Result.ResultsEntity> datas) {
    this.context = context;
    this.datas = datas;
}

@Override
public int getCount() {
    return datas.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, ViewGroup parent) {
    //根据position返回条目类型
    int viewType = getItemViewType(position);
    //判断条目类型  绑定不同的viewholder和布局
    switch (viewType) {
        case ITEM_VIEW_TYPE_ONE:
            ViewHolderOne viewHolderOne = null;
            if (convertView == null) {
                viewHolderOne = new ViewHolderOne();
                convertView = LayoutInflater.from(context).inflate(R.layout.home_list_item_one, null);
                viewHolderOne.desc = convertView.findViewById(R.id.tv_desc);
                convertView.setTag(viewHolderOne);
            } else {
                viewHolderOne = (ViewHolderOne) convertView.getTag();
            }
            viewHolderOne.desc.setText(datas.get(position).getDesc());
            break;

        case ITEM_VIEW_TYPE_TWO:
            ViewHolderTwo viewHolderTwo = null;
            if (viewHolderTwo == null) {
                viewHolderTwo = new ViewHolderTwo();
                convertView = LayoutInflater.from(context).inflate(R.layout.two, null);
                viewHolderTwo.desc = convertView.findViewById(R.id.tv_desc);
                viewHolderTwo.imageOne = convertView.findViewById(R.id.image_one);
                convertView.setTag(viewHolderTwo);
            } else {
                viewHolderTwo = (ViewHolderTwo) convertView.getTag();
            }
            viewHolderTwo.desc.setText(datas.get(position).getDesc());
            Glide.with(context).load(datas.get(position).getImages().get(0)).into(viewHolderTwo.imageOne);
            break;
        case ITEM_VIEW_TYPE_THERE:
            ViewHolderThree viewHolderThree = null;
            if (convertView == null) {
                viewHolderThree = new ViewHolderThree();
                convertView = LayoutInflater.from(context).inflate(R.layout.three, null);
                viewHolderThree.desc = convertView.findViewById(R.id.tv_desc);
                viewHolderThree.imageOne = convertView.findViewById(R.id.image_one);
                viewHolderThree.imageTwo = convertView.findViewById(R.id.image_two);
                convertView.setTag(viewHolderThree);

            } else {
                viewHolderThree = (ViewHolderThree) convertView.getTag();
            }
            viewHolderThree.desc.setText(datas.get(position).getDesc());
            if (datas.get(position).getImages().equals("") || datas.get(position).getImages().size() == 0) {

            } else {
                Glide.with(context).load(datas.get(position).getImages().get(0)).into(viewHolderThree.imageOne);
                Glide.with(context).load(datas.get(position).getImages().get(1)).into(viewHolderThree.imageTwo);
            }
            break;
    }

    return convertView;
}

class ViewHolderOne {
    TextView desc;
}

class ViewHolderTwo extends ViewHolderOne {
    ImageView imageOne;
}

class ViewHolderThree extends ViewHolderTwo {
    ImageView imageTwo;
}
//返回条目视图类型
@Override
public int getItemViewType(int position) {
    List<String> images = datas.get(position).getImages();

    if (images == null) {
        return ITEM_VIEW_TYPE_ONE;
    } else if (images.size() == 1) {
        return ITEM_VIEW_TYPE_TWO;
    } else {
        return ITEM_VIEW_TYPE_THERE;
    }
}

//返回条目视图类型数量
@Override
public int getViewTypeCount() {
return ITEM_VIEW_TYPE_COUNT;
}
}