如何在recyclerView android中停止项目重复
实际上我的问题是当我点击它去一个DetailsFragment的项目。 但是当我返回到我的ItemListFragment时，项目编号会增加并且会发生重复。 请帮我恢复..先谢谢….
ItemListFragment
public class ItemsListFragment extends Fragment { public static final String SINGLE_ITEMS = "single_items"; String[] mNames; String[] mPrices; int[] mImages; Context mContext; ArrayList mArrayList = new ArrayList(); @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_items_list, container, false); RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.items_list_recycler); String allFields = getArguments().getString(CategoryFragment.ALL_FIELD); assert allFields != null; switch (allFields) { case "women_clothing": mNames = getResources().getStringArray(R.array.women_clothing_names); mPrices = getResources().getStringArray(R.array.women_clothing_prices); mImages = DataValues.women_clothing_images; break; case "women_shoes": mNames = getResources().getStringArray(R.array.women_shoes_names); mPrices = getResources().getStringArray(R.array.women_shoes_prices); mImages = DataValues.women_shoes_images; break; case "women_bags": mNames = getResources().getStringArray(R.array.women_bags_names); mPrices = getResources().getStringArray(R.array.women_bags_prices); mImages = DataValues.women_bags_images; break; case "women_watches": mNames = getResources().getStringArray(R.array.women_watches_names); mPrices = getResources().getStringArray(R.array.women_watches_prices); mImages = DataValues.women_watches_images; break; case "women_sunglasses": mNames = getResources().getStringArray(R.array.women_sunglasses_names); mPrices = getResources().getStringArray(R.array.women_sunglasses_prices); mImages = DataValues.women_sunglasses_images; break; case "women_accessories": mNames = getResources().getStringArray(R.array.women_accessories_names); mPrices = getResources().getStringArray(R.array.women_accessories_prices); mImages = DataValues.women_accessories_images; break; } int i = 0; for (String name : mNames) { Data data = new Data(name, mPrices[i], mImages[i]); mArrayList.add(data); i++; } ItemListGridAdapter adapter = new ItemListGridAdapter(getActivity(), mArrayList, allFields); recyclerView.setAdapter(adapter); RecyclerView.LayoutManager manager = new GridLayoutManager(getActivity(), 2); recyclerView.setLayoutManager(manager); recyclerView.setHasFixedSize(true); return view; } } ItemListGridAdapter
public class ItemListGridAdapter extends RecyclerView.Adapter { public static final String POSITION = "position"; private Context mContext; private ArrayList mArrayList = new ArrayList(); private String mAllFields; public ItemListGridAdapter(Context context, ArrayList arrayList, String allfields) { mContext = context; mArrayList = arrayList; mAllFields = allfields; } @Override public ItemListViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_itemlist, parent, false); ItemListViewHolder viewHolder = new ItemListViewHolder(view); return viewHolder; } @Override public void onBindViewHolder(ItemListViewHolder holder, final int position) { Data data = mArrayList.get(position); holder.mName.setText(data.getName()); holder.mPrice.setText(data.getPrice()); holder.mImage.setImageResource(data.getImageId()); final Bundle bundle = new Bundle(); holder.mRelativeLayout.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { switch (mAllFields) { case "women_clothing": DetailsFragment fragment = new DetailsFragment(); bundle.putInt(POSITION, (position + 10)); fragment.setArguments(bundle); FragmentManager fragmentManager = ((Activity) mContext).getFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); fragmentTransaction.replace(R.id.home_main_frame, fragment); fragmentTransaction.addToBackStack(null); fragmentTransaction.commit(); break; case "women_shoes": DetailsFragment fragment1 = new DetailsFragment(); bundle.putInt("position", (position + 10)); fragment1.setArguments(bundle); FragmentManager fragmentManager1 = ((Activity) mContext).getFragmentManager(); FragmentTransaction fragmentTransaction1 = fragmentManager1.beginTransaction(); fragmentTransaction1.replace(R.id.home_main_frame, fragment1); fragmentTransaction1.addToBackStack(null); fragmentTransaction1.commit(); break; case "women_bags": DetailsFragment fragment2 = new DetailsFragment(); bundle.putInt("position", (position + 10)); fragment2.setArguments(bundle); FragmentManager fragmentManager2 = ((Activity) mContext).getFragmentManager(); FragmentTransaction fragmentTransaction2 = fragmentManager2.beginTransaction(); fragmentTransaction2.replace(R.id.home_main_frame, fragment2); fragmentTransaction2.addToBackStack(null); fragmentTransaction2.commit(); break; case "women_watches": DetailsFragment fragment3 = new DetailsFragment(); bundle.putInt("position", (position + 10)); fragment3.setArguments(bundle); FragmentManager fragmentManager3 = ((Activity) mContext).getFragmentManager(); FragmentTransaction fragmentTransaction3 = fragmentManager3.beginTransaction(); fragmentTransaction3.replace(R.id.home_main_frame, fragment3); fragmentTransaction3.addToBackStack(null); fragmentTransaction3.commit(); break; case "women_sunglasses": DetailsFragment fragment4 = new DetailsFragment(); bundle.putInt("position", (position + 10)); fragment4.setArguments(bundle); FragmentManager fragmentManager4 = ((Activity) mContext).getFragmentManager(); FragmentTransaction fragmentTransaction4 = fragmentManager4.beginTransaction(); fragmentTransaction4.replace(R.id.home_main_frame, fragment4); fragmentTransaction4.addToBackStack(null); fragmentTransaction4.commit(); break; case "women_accessories": DetailsFragment fragment5 = new DetailsFragment(); bundle.putInt("position", (position + 10)); fragment5.setArguments(bundle); FragmentManager fragmentManager5 = ((Activity) mContext).getFragmentManager(); FragmentTransaction fragmentTransaction5 = fragmentManager5.beginTransaction(); fragmentTransaction5.replace(R.id.home_main_frame, fragment5); fragmentTransaction5.addToBackStack(null); fragmentTransaction5.commit(); break; } } }); } @Override public int getItemCount() { return mArrayList.size(); } public class ItemListViewHolder extends RecyclerView.ViewHolder { private TextView mName; private TextView mPrice; private ImageView mImage; private RelativeLayout mRelativeLayout; public ItemListViewHolder(View itemView) { super(itemView); mName = (TextView) itemView.findViewById(R.id.item_name_text); mPrice = (TextView) itemView.findViewById(R.id.item_price_text); mImage = (ImageView) itemView.findViewById(R.id.item_image); mRelativeLayout = (RelativeLayout) itemView.findViewById(R.id.item_click); } } }
DetailsFragment
public class DetailsFragment extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_details, container, false); TextView mTitle = (TextView) view.findViewById(R.id.item_details_title); TextView mPrice = (TextView) view.findViewById(R.id.item_details_price); ImageView mImage = (ImageView) view.findViewById(R.id.item_details_image); TextView mDescription = (TextView) view.findViewById(R.id.item_details_description); int position = getArguments().getInt(ItemListGridAdapter.POSITION); Toast.makeText(getActivity(), ""+position, Toast.LENGTH_SHORT).show(); return view; }
做这个
int i = 0; mArrayList.clear(); //Clear your array list before adding new data in it for (String name : mNames) { Data data = new Data(name, mPrices[i], mImages[i]); mArrayList.add(data); i++; }
通过这样做，您的数据将不再重复。 尝试一下，让我知道它是否适合你。
还有一个帮助：
bundle.putInt("position", position); bundle.putString("text", your_text_field); ... fragment.setArguments(bundle); ...
清除列表：
int i = 0; if(mArraylist.size>0) mArrayList.clear(); //Clear your array list before adding new data in it for (String name : mNames) { Data data = new Data(name, mPrices[i], mImages[i]); mArrayList.add(data); i++; }
通过这样做，您的数据将不再重复。