[英]Xamarin, New activity on itemClick in RecyclerView
我正在嘗試以學習為目的的碩士和詳細信息申請。
在我的recyclerview中,當我單擊項目時,我要開始新活動並將數據發送到新活動。
我在listview示例中做到了,但是我在這里苦苦掙扎。
這是我的適配器
using Android.App;
using Android.Widget;
using Android.OS;
using System.Threading.Tasks;
using System;
using System.Threading;
using System.Collections.Generic;
using Android.Content;
using Newtonsoft.Json;
using Petrolium.DataObjects;
using Petrolium.Utilities;
using Petrolium.Activities;
using Android.Support.V7.Widget;
using Android.Views;
using static Android.Support.V7.Widget.RecyclerView;
namespace Petrolium.Adapters
{
public class CompanyRecyclerAdapter : RecyclerView.Adapter
{
static List<Company> _companies = new List<Company>();
public CompanyRecyclerAdapter(Context context, List<Company> companies) => _companies = companies;
public override int ItemCount => _companies.Count;
private class CompanyViewHolder : ViewHolder
{
public ImageView companyImageView
{
get;
set;
}
public TextView companyNameView
{
get;
set;
}
public CompanyViewHolder(View itemView) : base(itemView)
{
companyImageView = itemView.FindViewById<ImageView>(Resource.Id.company_image);
companyNameView = itemView.FindViewById<TextView>(Resource.Id.company_name);
itemView.Click += (sender, e) =>
{
var context = itemView.Context;
Intent intent = new Intent(context, typeof(DetailsActivity));
intent.PutExtra(GetText(Resource.String.DetailsStringToJSON),
JsonConvert.SerializeObject(_companies[e.Position].Fuels));
StartActivity(intent);
};
}
}
public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
CompanyViewHolder vh = holder as CompanyViewHolder;
vh.companyImageView.SetImageResource(Resource.Drawable.gulf);
vh.companyNameView.Text = _companies[position].Name;
}
public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
{
View itemview = LayoutInflater.From(parent.Context).Inflate(Resource.Layout.Company, parent, false);
CompanyViewHolder vh = new CompanyViewHolder(itemview);
return vh;
}
}
}
但是也沒有GetText方法,也有e。 沒有任何排名字段或屬性。 另外,沒有StartActivity方法可以傳遞我的意圖。
在recyclerView中進行itemClick並開始新活動的最佳實踐是什么? 如何處理這個問題?
我是android開發的初學者,對不起,如果我問簡單的事情。
您的ViewHolder
應該只是將click事件傳遞給Adapter
然后再傳遞給Fragment
或Activity
來處理該事件。
public CompanyViewHolder(View itemView, Action<int> listener) : base(itemView)
{
companyImageView = itemView.FindViewById<ImageView>(Resource.Id.company_image);
companyNameView = itemView.FindViewById<TextView>(Resource.Id.company_name);
itemView.Click += (sender, e) => listener (base.LayoutPosition);
}
然后在您的適配器中應該有一個事件,讓Fragment或Activity綁定到:
public class CompanyRecyclerAdapter : RecyclerView.Adapter
{
public event EventHandler<int> ItemClick;
void OnClick(int position)
{
if (ItemClick != null)
ItemClick(this, position);
}
...
public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
{
View itemview = LayoutInflater.From(parent.Context).Inflate(Resource.Layout.Company, parent, false);
CompanyViewHolder vh = new CompanyViewHolder(itemview, OnClick);
return vh;
}
}
然后,最后在您的Fragment或Activity中,可以綁定到Adapter中的ItemClick事件來處理它:
mAdapter = new CompanyRecyclerAdapter(mPhotoAlbum);
mAdapter.ItemClick += OnItemClick;
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