具有多种视图类型和数据源的RecyclerView [英] RecyclerView with multiple view types and data source
问题描述
我正在使用recyclerView，并且成功放大了两个视图，但是每个视图内容都来自不同的json数据类型.我试图在适配器中传递两个数据类型，但它们没有正确绑定
I am working with a recyclerView and i succeeded in inflating two views but each view content comes from different json data types. i tried passing the two datatypes in the adapter but they are not properly binded
-
源代码
source code
公共类SimpleStringRecyclerViewAdapter:RecyclerView.Adapter {
public class SimpleStringRecyclerViewAdapter : RecyclerView.Adapter {
private Article[] mValues;
private List<YouTubeItem> mValues2;
Context context;
public SimpleStringRecyclerViewAdapter(Context context, Article[] items, List<YouTubeItem> item )
{
this.context = context;
mValues = items;
mValues2 = item;
}
public override int ItemCount
{
get
{
return mValues.Count() + mValues2.Count();
}
}
public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
if (holder is SimpleViewHolder)
try
{
Article item = mValues[position];
var simpleHolder = holder as SimpleViewHolder;
simpleHolder.mTxtView.Text = Android.Text.Html.FromHtml(item.Title).ToString();
simpleHolder.mTxtView2.Text = item.Description;
using (var imageView = simpleHolder.mImageView)
{
string url = Android.Text.Html.FromHtml(item.UrlToImage).ToString();
//Download and display image
UrlImageViewHelper.SetUrlDrawable(imageView,
url, Resource.Drawable.cheese_1
);
}
// simpleHolder.mprogressbar.Visibility = ViewStates.Gone;
}
catch (Exception e)
{
//Toast.MakeText(this.context, e.ToString(), ToastLength.Long).Show();
}
else
{
try
{
YouTubeItem item = mValues2[position];
var simpleHolder = holder as SimpleViewHolder2;
simpleHolder.mTxtView.Text = Android.Text.Html.FromHtml(item.Title).ToString();
// simpleHolder.mTxtView2.Text = item.DescriptionShort;
using (var imageView = simpleHolder.mImageView)
{
string url = Android.Text.Html.FromHtml(item.MaxResThumbnailUrl).ToString();
//Download and display image
UrlImageViewHelper.SetUrlDrawable(imageView,
url, Resource.Drawable.cheese_1
);
}
}
catch (Exception e)
{
//Toast.MakeText(this.context, e.ToString(), ToastLength.Long).Show();
}
}
}
public override int GetItemViewType(int position)
{
if ((position % 2) == 0)
{
//Even number
return Resource.Layout.List_Item;
}
else
{
//Odd number
return Resource.Layout.VideoList;
}
}
public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
{
if (viewType == Resource.Layout.List_Item)
{
View view = LayoutInflater.From(parent.Context).Inflate(Resource.Layout.List_Item, parent, false);
view.SetBackgroundColor(Color.White);
SimpleViewHolder holder = new SimpleViewHolder(view);
// holder.mprogressbar = view.FindViewById<ProgressBar>(Resource.Id.progressBar);
// holder.mprogressbar.Visibility = ViewStates.Visible;
//Showing loading progressbar
return holder;
}
else
{
View view = LayoutInflater.From(parent.Context).Inflate(Resource.Layout.VideoList, parent, false);
view.SetBackgroundColor(Color.White);
SimpleViewHolder2 holder = new SimpleViewHolder2(view);
return holder;
}
}
}
公共类SimpleViewHolder:RecyclerView.ViewHolder { 公共字符串mBoundString; 公共只读视图mView; 公共只读ImageView mImageView; 公共只读TextView mTxtView; 公共只读TextView mTxtView2; //公共ProgressBar mprogressbar;
public class SimpleViewHolder : RecyclerView.ViewHolder { public string mBoundString; public readonly View mView; public readonly ImageView mImageView; public readonly TextView mTxtView; public readonly TextView mTxtView2; // public ProgressBar mprogressbar;
public SimpleViewHolder(View view) : base(view)
{
mView = view;
mImageView = view.FindViewById<ImageView>(Resource.Id.avatar);
mTxtView = view.FindViewById<TextView>(Resource.Id.Text1);
mTxtView2 = view.FindViewById<TextView>(Resource.Id.Text2);
// mprogressbar = view.FindViewById<ProgressBar>(Resource.Id.progressBar);
}
public override string ToString()
{
return base.ToString() + " '" + mTxtView.Text;
}
} 公共类SimpleViewHolder2:RecyclerView.ViewHolder { 公共字符串mBoundString; 公共只读视图mView; 公共只读ImageView mImageView; 公共只读TextView mTxtView; 公共只读TextView mTxtView2;
} public class SimpleViewHolder2 : RecyclerView.ViewHolder { public string mBoundString; public readonly View mView; public readonly ImageView mImageView; public readonly TextView mTxtView; public readonly TextView mTxtView2;
public SimpleViewHolder2(View view) : base(view)
{
mView = view;
mImageView = view.FindViewById<ImageView>(Resource.Id.videoavatar);
mTxtView = view.FindViewById<TextView>(Resource.Id.videoText1);
// mprogressbar = view.FindViewById<ProgressBar>(Resource.Id.progressBar);
}
推荐答案
您应仅将数据合并到一个数据源.您可以尝试这种方式:
You should merge data to one data source only. You can try this way:
-
创建数据源类
Create data source class
public class Data {
int type; // 1 is article and 2 is youtubeitem
public Article article;
public YouTubeItem youTubeItem;
}
现在将两个数据源合并为一个数据
Now merge two data source to only one
public List<Data> merge(Articel[] articles, List<YouTubeItem> items) {
List<Data> datas = new ArrayList<>();
for(Article article : articles) {
Data data = new Data();
data.article = article;
data.youTubeItem = null;
data.type = 1;
datas.add(data);
}
for(YouTubeItem item : items) {
Data data = new Data();
data.article = null;
data.youTubeItem = item;
data.type = 2;
datas.add(data);
}
return datas;
}
更改适配器的构造函数
Change constructor of adapter
private List<Data> datas;
public SimpleStringRecyclerViewAdapter(Context context, List<Data> datas )
{
this.datas = datas;
}
更改获取项目数
Change get Item count
public override int ItemCount
{
get
{
return datas.Count();
}
}
更改getViewType
Change getViewType
public override int GetItemViewType(int position)
{
if (datas.get(position).type == 1)
{
return Resource.Layout.List_Item;
}
else
{
return Resource.Layout.VideoList;
}
}
已编辑:用于合并随机方法
public List<Data> mergeRandom(Articel[] articles, List<YouTubeItem> items) {
List<Data> datas = new ArrayList<>();
List<Integer> random = new ArrayList<>();
int maxLength = articles.length + items.size();
for(int i = 0; i< maxLength; i++) {
random.add(i);
}
while (random.size() > 0) {
// get random item
int index = new Random().nextInt(random.size());
int position = random.get(index);
if(position <= article.length - 1) {
Data data = new Data();
data.article = articles[position];
data.youTubeItem = null;
data.type = 1;
datas.add(data);
} else {
Data data = new Data();
data.article = null;
data.youTubeItem = items.get(position - article.length);
data.type = 2;
datas.add(data);
}
random.remove(index);
}
return datas;
}
用于合并奇偶方法
List<Data> mergeOddEven(Articel[] articles, List<YouTubeItem> items) {
List<Data> datas = new ArrayList<>();
int articleIndex = 0;
int youtubeIndex = 0;
int length = articles.length + items.size();
for(int i = 0; i< length; i++) {
if(articleIndex >= articles.length || youtubeIndex >= items.size()) {
if(articleIndex < articles.length) {
for(int j = articleIndex; j < articles.length ; j++) {
Data data = new Data();
data.article = articles[j];
data.youTubeItem = null;
data.type = 1;
datas.add(data);
}
} else {
for(int j = youtubeIndex; j < items.size() ; j++) {
Data data = new Data();
data.article = null;
data.youTubeItem = items.get(j);
data.type = 2;
datas.add(data);
}
}
break;
}
if(i % 2 == 0) {
Data data = new Data();
data.article = articles[articleIndex];
data.youTubeItem = null;
data.type = 1;
datas.add(data);
articleIndex++;
} else {
Data data = new Data();
data.article = null;
data.youTubeItem = tems.get(youtubeIndex);
data.type = 2;
datas.add(data);
youtubeIndex++;
}
}
return datas;
}
希望有帮助
这篇关于具有多种视图类型和数据源的RecyclerView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
