在回收视图适配器中使用它之前，将字符串数组数据转换为数组列表

Question

我有一个 api 的结构是这样的：

{"seasons":[
{
"id":"1",
"titles":"s1episode1;s1episode2;s1episode3"
},
{
"id":"2",
"titles":"s2episode1;s2episode2;s2episode3;s2episode4;s2episode5"
}
]}

等等

我希望数据显示在回收视图中，如下所示：

s1episode1
s1episode2
s1episode3
s2episode1
s2episode2
s2episode3
s2episode4
s2episode5

所以每行代表回收视图的一个项目

我解析数据并在模型类中使用可包裹：

public class Series implements Parcelable {
private int id;
private String titles;
public Series(int id, String titles) {
this.id = id;
this.titles = titles;
}
@Override
public void writeToParcel(Parcel out, int flags) {
out.writeInt(id);
out.writeString(titles);
}
private Series(Parcel in) {
this.id         = in.readInt();
this.titles         = in.readString();
}
public Series() {
}
@Override
public int describeContents() {
return 0;
}
public static final Creator<Series> CREATOR = new Creator<Series>() {
@Override
public Series createFromParcel(Parcel in) {
return new Series(in);
}
@Override
public Series[] newArray(int i) {
return new Series[i];
}
};
public int getId() {
return id;
}
public String getTitles() {
return titles;
}
public List<String> getEpisodes(){
String[] titles = getTitles().split(";");
List<String> titleList = Arrays.asList(titles);
String titlesArray = null;
for (String e : titleList) {
titlesArray += String.valueOf(e);
}
return titleList;
}
}

你可以在getEpisodes((中看到我试图通过将其从字符串数组转换为arraylist来处理数据，以便在回收视图中使用它之前对其进行准备

我为 RecyclerViewAdapter 创建了一个新集合：

class Episode {
int id;
String title;
public Episode(int id, String title) {
this.id = id;
this.title = title;
}
public static List<Episode> createEpisodeList(int id, List<String> titles) {
List<Episode> episodes = new ArrayList(titles.size());
for (String title : titles) {
episodes.add(new Episode(id, title));
}
return episodes;
}
}

这是回收视图适配器的代码：

public class SeriesAdapter extends RecyclerView.Adapter<SeriesAdapter.RecyclerViewHolder> {
ArrayList<Series> mSeries;
List<Episode> episodesList = new ArrayList();
private Context context;
private SeriesAdapterOnClickHandler mClickHandler;
public interface SeriesAdapterOnClickHandler {
void onClick(Series series);
}
public SeriesAdapter(SeriesAdapterOnClickHandler clickHandler) {
mClickHandler = clickHandler;
}
public void setClickListener(SeriesAdapterOnClickHandler callback) {
mClickHandler = callback;
}
class RecyclerViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public final TextView title;
public RecyclerViewHolder(View view) {
super(view);
title = (TextView)itemView.findViewById(R.id.title);
view.setOnClickListener(this);
}
@Override
public void onClick(View v) {
int adapterPosition = getAdapterPosition();
Series series = mSeries.get(adapterPosition);
mClickHandler.onClick(series);
}
}
@Override
public RecyclerViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
context = viewGroup.getContext();
int layoutIdForListItem = R.layout.series_list_item;
LayoutInflater inflater = LayoutInflater.from(context);
boolean shouldAttachToParentImmediately = false;
View view = inflater.inflate(layoutIdForListItem, viewGroup, shouldAttachToParentImmediately);
RecyclerViewHolder holder = new RecyclerViewHolder(view);
return new RecyclerViewHolder(view);
}
@Override
public void onBindViewHolder(final RecyclerViewHolder holder, final int position) {
holder.title.setText(String.valueOf(mSeries.get(position).getEpisodes()));
}
@Override
public int getItemCount() {
if (null == mSeries)
return 0;
else {
return mSeries.size();
}
}
@Override
public int getItemViewType(int position) {
if (null == mSeries)
return 0;
else {
return mSeries.size();
}
}
public void setSeriesData(ArrayList<Series> seriesData) {
for (Series s : seriesData) {
episodesList.addAll(Episode.createEpisodeList(s.getEpisodes()));
}
//        mSeries = seriesData;
notifyDataSetChanged();
}
}

但在应用程序中，数据未显示任何内容

那么我应该如何处理数据，将其从字符串数组转换为 arrayList，以准备在 RecycleView 中使用并将每一集显示为单个回收项目

喜欢这个：

s1episode1
s1episode2
s1episode3
s2episode1
s2episode2
s2episode3
s2episode4
s2episode5

Answer 1

为 RecyclerViewAdapter 创建新集合：

class Episode {
int id;
String title;
public Episode(int id, String title) {
this.id = id;
this.title = title;
}
public static List<Episode> createEpisodeList(int id, List<String> titles) {
List<Episode> episodes = new ArrayList(titles.size());
for (String title : titles) {
episodes.add(new Episode(id, title));
}
return episodes;
}
}

并在适配器中将系列列表转换为新集合：

List<Episode> episodesList = new ArrayList();
void setSeries(List<Series> series) {
for (Series s : series) {
episodesList.addAll(Episode.createEpisodeList(s.id, s.getEpisododes()));
}
notifyDataSetChanged();
}

编辑的适配器代码：

public class EpisodeAdapter extends RecyclerView.Adapter<EpisodeAdapter.RecyclerViewHolder> {
private static final int TYPE_EPISODE = 0; // it's possible to show multiple types recycler
List<Episode> episodesList = new ArrayList();
private Context context;
private AdapterOnClickHandler mClickHandler;
public interface AdapterOnClickHandler {
void onClick(Episode episode);
}
public EpisodeAdapter(AdapterOnClickHandler clickHandler) {
mClickHandler = clickHandler;
}
public void setClickListener(AdapterOnClickHandler callback) {
mClickHandler = callback;
}
class RecyclerViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public final TextView title;
public RecyclerViewHolder(View view) {
super(view);
title = (TextView)itemView.findViewById(R.id.title);
view.setOnClickListener(this);
}
public void setData(Episode episode) {
title.setText(episode.title);
}
@Override
public void onClick(View v) {
int adapterPosition = getAdapterPosition();
Episode episode = episodesList.get(adapterPosition);
mClickHandler.onClick(episode);
}
}
@Override
public RecyclerViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
context = viewGroup.getContext();
View view = LayoutInflater.from(context).inflate(R.layout.series_list_item, viewGroup, false);
return new RecyclerViewHolder(view);
}
@Override
public void onBindViewHolder(final RecyclerViewHolder holder, final int position) {
holder.setData(episodesList.get(position));
}
@Override
public int getItemCount() {
return episodesList.size();
}
@Override
public int getItemViewType(int position) {
return TYPE_EPISODE;
}
public void setSeriesData(ArrayList<Series> seriesData) {
episodesList.clear();
for (Series s : seriesData) {
episodesList.addAll(Episode.createEpisodeList(s.getEpisodes()));
}
notifyDataSetChanged();
}
}

Answer 2

String.valueOf(list)(来自holder.title.setText(String.valueOf(mSeries.get(position).getEpisodes()))(肯定会返回这样的结果。你基本上只是在打电话给arrayListInstance.toString().您应该覆盖getItemCount()方法来返回所有系列剧集列表大小的总和(通过您喜欢的任何方式(，并且每个绑定都应从列表中返回一个值，而不是调用list.toString()(这就是String.valueOf()内部发生的事情(。我建议在回收器视图实现的构造函数中传递所有系列剧集的合并列表。

Answer 3

我想最简单的方法是在方法getEpisodes中连接一个换行符。像这样的东西(我确信还有其他，也许更好的方法可以做到这一点(：

public List<String> getEpisodes(){
String[] titles = getTitles().split(";");
List<String> titleList = Arrays.asList(titles);
String titlesArray = null;
for (String e : titleList) {
titlesArray += String.valueOf(e) + "n";
}
return titleList;
}