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我有一个与一些项目的recyclerview。当有人点击主片段中的项目时，它将存储在sharedpreferences上，然后所有点击的项目都应该显示在另一个片段上。我的问题是当有人点击一个项目时，只有第一个点击的项目显示在另一个片段（细节片段）而不是项目列表。显示存储在共享首选项上的项目列表
这些都是节约的方法，检索和我SessionManager.class
public void saveitems(Context context,List<SingleItem> items){
Gson gson = new Gson();
String cartitems = gson.toJson(items);
editor.putString(KEY_ITEMS,cartitems);
editor.commit();
}
public void grandtotal (String total){
editor.putString(KEY_TOTAL,total);
editor.commit();
}
public void savetocart(Context context, SingleItem singleitems){
List<SingleItem> itemList = getItems(context);
if (itemList == null) {
itemList = new ArrayList<>();
itemList.add(singleitems);
saveitems(context, itemList);
}
}
public ArrayList<SingleItem> getItems(Context context){
List<SingleItem> items;
if (pref.contains(KEY_ITEMS)){
String cartitems = pref.getString(KEY_ITEMS,null);
Gson gson = new Gson();
SingleItem[] singleItems = gson.fromJson(cartitems,SingleItem[].class);
items = Arrays.asList(singleItems);
items = new ArrayList<>(items);
}
else
return null;
return (ArrayList<SingleItem>) items;
}
public void removeitem(Context context, SingleItem singleItem){
ArrayList<SingleItem> items = getItems(context);
if (items != null){
items.remove(singleItem);
saveitems(context,items);
}
}
删除项目我这是如何存储已被点击的项目。看看（RecyclerItems）：
package com.carlton.shop;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.AlertDialog;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import es.dmoral.toasty.Toasty;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
import ss.com.bannerslider.banners.RemoteBanner;
import ss.com.bannerslider.views.BannerSlider;
/**
* A simple {@link Fragment} subclass.
*/
public class MainFragment extends Fragment {
private BannerSlider bannerSlider;
private RecyclerView Categories;
public RecyclerView RecyclerItems;
private ShopItemAdapter adapter;
private List<ShopItem> item;
SessionManager sessionManager;
private List<SingleItem> items;
private SingleItemAdapter adapters;
private LinearLayout Layoutcategories, Layoutitems;
private TextView CatName;
private Button Up;
public MainFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(final LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_main, container, false);
bannerSlider = (BannerSlider) view.findViewById(R.id.banner_slider1);
Categories = (RecyclerView) view.findViewById(R.id.recyclercategories);
Layoutcategories = (LinearLayout) view.findViewById(R.id.LayoutCategories);
Layoutitems = (LinearLayout) view.findViewById(R.id.LayoutItems);
RecyclerItems = (RecyclerView) view.findViewById(R.id.recycleritems);
CatName = (TextView) view.findViewById(R.id.tvcategoryname);
Up = (Button) view.findViewById(R.id.btnup);
sessionManager = new SessionManager(getContext());
Categories.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getContext());
Categories.setLayoutManager(layoutManager);
RecyclerItems.setHasFixedSize(true);
RecyclerView.LayoutManager layoutmanager = new LinearLayoutManager(getContext());
RecyclerItems.setLayoutManager(layoutmanager);
Categories.addOnItemTouchListener(new RecyclerItemClickListener(getContext(), new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
Layoutcategories.setVisibility(View.GONE);
Layoutitems.setVisibility(View.VISIBLE);
sessionManager.createcategorysession(item.get(position).getCategory());
HashMap<String, String> cat = sessionManager.getcategoryitems();
CatName.setText(cat.get(SessionManager.KEY_CATEGORY));
Up.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Layoutitems.setVisibility(View.GONE);
Layoutcategories.setVisibility(View.VISIBLE);
}
});
items = new ArrayList<>(item.get(position).getItems());
adapters = new SingleItemAdapter(getContext(),items);
RecyclerItems.setAdapter(adapters);
RecyclerItems.addOnItemTouchListener(new RecyclerItemClickListener(getContext(), new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
sessionManager.savetocart(getContext(), items.get(position));
Toasty.success(getContext(),"Added to cart",Toast.LENGTH_SHORT,true).show();
}
}));
}
}));
Banner();
getdata();
return view;
}
private void Banner() {
bannerSlider.addBanner(new RemoteBanner("http://supa.swagshop.co.ke/Images/moto.png"));
bannerSlider.addBanner(new RemoteBanner("http://supa.swagshop.co.ke/Images/moto.png"));
bannerSlider.addBanner(new RemoteBanner("http://supa.swagshop.co.ke/Images/moto.png"));
bannerSlider.addBanner(new RemoteBanner("http://supa.swagshop.co.ke/Images/moto.png"));
}
private void getdata() {
final ProgressDialog progressDialog = new ProgressDialog(getContext());
progressDialog.setMessage("Loading Items...");
progressDialog.show();
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(Constants.BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
InterfaceRequest request = retrofit.create(InterfaceRequest.class);
Call<JSONResponse> call =request.getJSON();
call.enqueue(new Callback<JSONResponse>() {
@Override
public void onResponse(Call<JSONResponse> call, Response<JSONResponse> response) {
if (response.isSuccessful()){
JSONResponse jsonResponse = response.body();
item = new ArrayList<>(jsonResponse.getItem());
adapter = new ShopItemAdapter(getContext(),item);
Categories.setAdapter(adapter);
} else {
Toasty.warning(getContext(),"Oops! Items could not be loaded",Toast.LENGTH_SHORT,true).show();
}
progressDialog.dismiss();
}
@Override
public void onFailure(Call<JSONResponse> call, Throwable t) {
Toasty.error(getContext(),t.getLocalizedMessage(),Toast.LENGTH_SHORT,true).show();
Log.d(Constants.TAG,t.getMessage());
progressDialog.dismiss();
}
});
}
}
这就是我如何检索DetailsFragment上的项目;
package com.carlton.shop;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
import es.dmoral.toasty.Toasty;
import static com.helpshift.util.HelpshiftContext.getApplicationContext;
/**
* A simple {@link Fragment} subclass.
*/
public class Details extends Fragment {
private RecyclerView RecyclerDetails;
private TextView CartPrice;
private CheckBox CheckCart;
private List<SingleItem> list;
private CartAdapter adapter;
private boolean add = false;
private Paint p = new Paint();
private SessionManager sessionManager;
public Details() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_details, container, false);
RecyclerDetails = (RecyclerView) view.findViewById(R.id.recyclercart);
CartPrice = (TextView) view.findViewById(R.id.tvcart);
CheckCart = (CheckBox) view.findViewById(R.id.chkcart);
sessionManager = new SessionManager(getContext());
RecyclerDetails.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getContext());
RecyclerDetails.setLayoutManager(layoutManager);
list = sessionManager.getItems(getContext());
RecyclerDetails.addOnItemTouchListener(new RecyclerItemClickListener(getContext(), new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
}));
if(list != null){
Toasty.info(getContext(),"Swipe to go to Next", Toast.LENGTH_LONG,true).show();
adapter = new CartAdapter(getContext(),list);
RecyclerDetails.setAdapter(adapter);
}
//initswipe();
return view;
}
}