1

所以它看起来像这样： SCREENSHOT

但是当我单击添加或更少按钮时，它会返回整个列表的大小。 在这种情况下，它返回 2（因为 otitles.size() 返回 2）就像在我单击的项目下出现列表中的另一个项目一样。

父 RecyclerView 适配器：

public class recyclercart extends RecyclerView.Adapter<recyclercart.myViewHolder> {
Context context;
ArrayList<String> list;
public static View.OnClickListener onclickup;
public static View.OnClickListener onclickdown;
public static ArrayList<String> otitles = new ArrayList<>();
public static ArrayList<String> oimages = new ArrayList<>();
public static ArrayList<String> oingridients = new ArrayList<>();
public static ArrayList<String> odependencies = new ArrayList<>();
public static ArrayList<String> oquantities = new ArrayList<>();
public static ArrayList<String> oprices = new ArrayList<>();
public static ArrayList<String> ostartprices = new ArrayList<>();
public static ArrayList<String> obrand = new ArrayList<>();
public static ArrayList<String> oid = new ArrayList<>();
Cursor gettitle, getimage, getingridients, getdependencies,getquantities, getprices, getstartprice, getbrand, getid;
ArrayList<Integer> postoremove= new ArrayList<>();
ProgressBar progressBar;
SQLiteDatabase database;
public recyclercart(Context c, ProgressBar progressBar){
    context=c;
    this.progressBar=progressBar;
    SQLHelper helper = new SQLHelper(context);
    database = helper.getWritableDatabase();
    Cursor cursor = database.rawQuery("SELECT * FROM "+SQLHelper.DATABASE_TABLE, null);
    list =new ArrayList<>();
    cursor.moveToFirst();
    do {
        String lol = cursor.getString(cursor.getColumnIndex(SQLHelper.BRAND_NAME));
        list.add(lol.substring(0,lol.length()-5));
    }while (cursor.moveToNext());
    if(cursor.moveToLast()) {
        postoremove.clear();
        Log.d("glavniy", "LIST: " + list.toString());
        list = new ArrayList<>(removeDuplicates(list));
    }
}
@NonNull
@Override
public myViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    LayoutInflater inflater = LayoutInflater.from(context);
    View view = inflater.inflate(R.layout.templatecart, parent, false );
    return new myViewHolder(view);
}
@SuppressLint("SetTextI18n")
@Override
public void onBindViewHolder(@NonNull myViewHolder holder, int position) {
    otitles.clear();
    oimages.clear();
    oingridients.clear();
    odependencies.clear();
    oprices.clear();
    oquantities.clear();
    ostartprices.clear();
    obrand.clear();
    oid.clear();
    Cursor cur = database.rawQuery("SELECT "+SQLHelper.TITLE_NAME+" FROM "+SQLHelper.DATABASE_TABLE+" WHERE "+SQLHelper.BRAND_NAME+" LIKE '%"+
    list.get(position)+"%'", null);
    SQLHelper helper = new SQLHelper(context);
    SQLiteDatabase database = helper.getWritableDatabase();
    gettitle = database.rawQuery("SELECT "+SQLHelper.TITLE_NAME+" FROM "+SQLHelper.DATABASE_TABLE+" WHERE "
            +SQLHelper.BRAND_NAME+" LIKE '%"+list.get(position)+"%'", null);
    getimage = database.rawQuery("SELECT "+SQLHelper.IMAGESRC_NAME+" FROM "+SQLHelper.DATABASE_TABLE+" WHERE "
            +SQLHelper.BRAND_NAME+" LIKE '%"+list.get(position)+"%'", null);
    getingridients = database.rawQuery("SELECT "+SQLHelper.INGRIDIENTS_NAME+" FROM "+SQLHelper.DATABASE_TABLE+" WHERE "
            +SQLHelper.BRAND_NAME+" LIKE '%"+list.get(position)+"%'", null);
    getdependencies = database.rawQuery("SELECT "+SQLHelper.DEPENDENCIES_NAME+" FROM "+SQLHelper.DATABASE_TABLE+" WHERE "
            +SQLHelper.BRAND_NAME+" LIKE '%"+list.get(position)+"%'", null);
    getprices = database.rawQuery("SELECT "+SQLHelper.PRICE_NAME+" FROM "+SQLHelper.DATABASE_TABLE+" WHERE "
            +SQLHelper.BRAND_NAME+" LIKE '%"+list.get(position)+"%'", null);
    getquantities = database.rawQuery("SELECT "+SQLHelper.QUANTITY_NAME+" FROM "+SQLHelper.DATABASE_TABLE+" WHERE "
            +SQLHelper.BRAND_NAME+" LIKE '%"+list.get(position)+"%'", null);
    getstartprice = database.rawQuery("SELECT "+SQLHelper.START_PRICE+" FROM "+SQLHelper.DATABASE_TABLE+" WHERE "
            +SQLHelper.BRAND_NAME+" LIKE '%"+list.get(position)+"%'", null);
    getbrand = database.rawQuery("SELECT "+SQLHelper.BRAND_NAME+" FROM "+SQLHelper.DATABASE_TABLE+" WHERE "
            +SQLHelper.BRAND_NAME+" LIKE '%"+list.get(position)+"%'", null);
    getid = database.rawQuery("SELECT "+SQLHelper.KEY_ID+" FROM "+SQLHelper.DATABASE_TABLE+" WHERE "
            +SQLHelper.BRAND_NAME+" LIKE '%"+list.get(position)+"%'", null);

    if (gettitle.moveToFirst() && getimage.moveToNext() && getingridients.moveToFirst() && getdependencies.moveToFirst()
            && getprices.moveToFirst() && getquantities.moveToFirst() && getstartprice.moveToFirst() && getbrand.moveToFirst() && getid.moveToFirst()) {
        do {
            otitles.add(gettitle.getString(gettitle.getColumnIndex(SQLHelper.TITLE_NAME)));
            oimages.add(getimage.getString(getimage.getColumnIndex(SQLHelper.IMAGESRC_NAME)));
            oingridients.add(getingridients.getString(getingridients.getColumnIndex(SQLHelper.INGRIDIENTS_NAME)));
            odependencies.add(getdependencies.getString(getdependencies.getColumnIndex(SQLHelper.DEPENDENCIES_NAME)));
            oprices.add(getprices.getString(getprices.getColumnIndex(SQLHelper.PRICE_NAME)));
            oquantities.add(getquantities.getString(getquantities.getColumnIndex(SQLHelper.QUANTITY_NAME)));
            ostartprices.add(getstartprice.getString(getstartprice.getColumnIndex(SQLHelper.START_PRICE)));
            obrand.add(getbrand.getString(getbrand.getColumnIndex(SQLHelper.BRAND_NAME)));
            oid.add(getid.getString(getid.getColumnIndex(SQLHelper.KEY_ID)));
            Log.d("glavniy", String.valueOf(ostartprices));
        } while (gettitle.moveToNext() && getimage.moveToNext() && getingridients.moveToNext() && getdependencies.moveToNext()
                && getprices.moveToNext() && getquantities.moveToNext() && getstartprice.moveToNext() && getbrand.moveToNext() && getid.moveToNext());
    }
    if(gettitle.moveToLast()) {
        Log.d("glavniy", "MOVETOLAST");
        holder.recyclerView.setLayoutManager(new LinearLayoutManager(context));
        holder.recyclerView.setAdapter(new recyclerOrdersAdapter(context, otitles, oimages, oingridients, oquantities, oprices, ostartprices
                , obrand, odependencies, oid));
    }
    DatabaseReference reference = FirebaseDatabase.getInstance().getReference("resources");
    reference.child(list.get(position)).addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot snapshot) {
            holder.title.setText(snapshot.child("nameBrand").getValue().toString());
            Glide.with(context).load(snapshot.child("imageBrand").getValue().toString()).into(holder.imageView);
            try {
                if(recyclerSearchRecycler.timeCheck(snapshot.child("times").child("startTime").getValue().toString(),
                snapshot.child("times").child("closeTime").getValue().toString())){
                    holder.open.setText("OPEN");
                }else {holder.open.setText("CLOSED");}
            } catch (ParseException e) {
                e.printStackTrace();
            }
            reference.child(list.get(position)).child("addresses").addListenerForSingleValueEvent(new ValueEventListener() {
                @SuppressLint("SetTextI18n")
                @Override
                public void onDataChange(@NonNull DataSnapshot snapshot) {
                    for (DataSnapshot dataSnapshot : snapshot.getChildren()){
                        ArrayList<String> addresses = new ArrayList<>();
                        addresses.add(dataSnapshot.getValue().toString());
                        Log.d("glavniy", dataSnapshot.getValue().toString());
                        if(addresses.size()==snapshot.getChildrenCount()) {
                            try {
                                float distance = activityBrandPage.getNearestRest(addresses, context);
                                Log.d("glavniy", "DIST: " + distance);
                                if (distance <= 1000) {
                                    progressBar.setVisibility(View.INVISIBLE);
                                    holder.delivery.setText("Delivery: 400 AMD");
                                } else if (distance > 1000 && distance <= 2000) {
                                    holder.delivery.setText("Delivery: 500 AMD");
                                    progressBar.setVisibility(View.INVISIBLE);
                                } else if (distance > 2000 && distance <= 3000) {
                                    holder.delivery.setText("Delivery: 600 AMD");
                                } else if (distance > 3000 && distance <= 4000) {
                                    holder.delivery.setText("Delivery: 700 AMD");
                                    progressBar.setVisibility(View.INVISIBLE);
                                }
                                if (search.prog != null) {
                                    search.prog.setVisibility(View.INVISIBLE);
                                }
                            } catch (IOException e) {
                                e.printStackTrace();
                                progressBar.setVisibility(View.VISIBLE);
                                Toast.makeText(context, "Failed, please restart", Toast.LENGTH_SHORT).show();
                            }
                        }
                    }
                }

                @Override
                public void onCancelled(@NonNull DatabaseError error) {

                }
            });
        }

        @Override
        public void onCancelled(@NonNull DatabaseError error) {

        }
    });
}

@Override
public int getItemCount() {
    return list.size();
}

public static class myViewHolder extends RecyclerView.ViewHolder {
    TextView title, delivery, open;
    ImageView imageView;
    public static RecyclerView recyclerView;
    public myViewHolder(@NonNull View itemView) {
        super(itemView);
        imageView=itemView.findViewById(R.id.ivBrandCart);
        recyclerView=itemView.findViewById(R.id.recyclerMainCart);
        title=itemView.findViewById(R.id.tvBrandCart);
        delivery=itemView.findViewById(R.id.tvdelivery);
        open=itemView.findViewById(R.id.opentv);
    }
}

CHILD RecyclerView 适配器：

public class recyclerOrdersAdapter extends RecyclerView.Adapter<recyclerOrdersAdapter.myViewHolder> {
public static Context context;
SQLiteDatabase database;
public static int pos;
public static ArrayList<String> otitles = new ArrayList<>();
public static ArrayList<String> oimages = new ArrayList<>();
public static ArrayList<String> oingridients = new ArrayList<>();
public static ArrayList<String> odependencies = new ArrayList<>();
public static ArrayList<String> oquantities = new ArrayList<>();
public static ArrayList<String> oprices = new ArrayList<>();
public static ArrayList<String> ostartprices = new ArrayList<>();
public static ArrayList<String> obrand = new ArrayList<>();
public static ArrayList<String> oids = new ArrayList<>();

@SuppressLint("Recycle")
public recyclerOrdersAdapter(Context c, ArrayList<String> titles, ArrayList<String> images, ArrayList<String> ingridients,
                              ArrayList<String> quantities, ArrayList<String> prices, ArrayList<String> startprices, ArrayList<String> brands,
                             @Nullable ArrayList<String> dependencies, ArrayList<String> ids){
    System.out.println("hi");
    otitles=new ArrayList<>(titles);
    oimages= new ArrayList<>(images);
    oingridients=new ArrayList<>(ingridients);
    oquantities=new ArrayList<>(quantities);
    oprices=new ArrayList<>(prices);
    ostartprices=new ArrayList<>(startprices);
    obrand=new ArrayList<>(brands);
    oids=new ArrayList<>(ids);
    assert dependencies != null;
    odependencies=new ArrayList<>(dependencies);
    context = c;
}
@NonNull
@Override
public myViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    LayoutInflater inflater = LayoutInflater.from(context);
    View view = inflater.inflate(R.layout.templateorders, parent, false );
    return new myViewHolder(view);
}

@SuppressLint("SetTextI18n")
@Override
public void onBindViewHolder(@NonNull myViewHolder holder, int position) {
    System.out.println("hello n");
    if(obrand.size()!=0) {
        String title = otitles.get(position);
        String image = oimages.get(position);
        String ingridient = oingridients.get(position);
        String dependencie = odependencies.get(position);
        String priceik = oprices.get(position);
        String quanik = oquantities.get(position);
        ingridient = ingridient.replaceAll("[^a-zA-Z0-9, ]", "");
        if (ingridient.contains("null, ")) {
            ingridient = ingridient.replaceAll("null, ", "");
        } else if (ingridient.contains("null,")) {
            ingridient = ingridient.replaceAll("null,", "");
        } else {
            ingridient = ingridient.replaceAll("null", "");
        }
        dependencie = dependencie.replaceAll("[^a-zA-Z0-9, ]", "");

        System.out.println("ingridients " + ingridient);
        holder.title.setText(title);
        Glide.with(context).load(image).placeholder(R.drawable.elipsis).into(holder.imageView);
        holder.ingridients.setText(ingridient);
        if(odependencies.get(position)!=null) {
            holder.dependencies.setText(dependencie);
        }
        if(!priceik.contains("$")) {
            holder.price.setText(priceik + "$");
        }else {
            holder.price.setText(priceik);
        }
        holder.quantity.setText(quanik);
        holder.startprice.setText(ostartprices.get(position));
        holder.id.setText(oids.get(position));
        SQLHelper helper = new SQLHelper(context);
        database = helper.getWritableDatabase();
        holder.delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.d("glavniy", "TITLE: "+holder.title.getText().toString());
                Log.d("glavniy", "position is" + String.valueOf(position));
                SQLHelper helper = new SQLHelper(context);
                SQLiteDatabase database = helper.getWritableDatabase();
                database.execSQL("DELETE FROM " + SQLHelper.DATABASE_TABLE + " WHERE (" + SQLHelper.KEY_ID +
                        "='" + holder.id.getText().toString() + "')");
                notifyItemRemoved(position);
                Log.d("glavniy", DatabaseUtils.dumpCursorToString(database.rawQuery("SELECT * FROM " + SQLHelper.DATABASE_TABLE, null)));
            }
        });
        holder.up.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.d("glavniy", "TITLE: "+holder.title.getText().toString());
                int o = Integer.parseInt(holder.quantity.getText().toString())+1;
                holder.quantity.setText(String.valueOf(o));
                int o1 = Integer.parseInt(holder.startprice.getText().toString()) * Integer.parseInt(holder.quantity.getText().toString());
                holder.price.setText(o1 + "$");
                Log.d("glavniy", "UPDATED");
                database.execSQL("UPDATE " + SQLHelper.DATABASE_TABLE + " SET " + SQLHelper.QUANTITY_NAME + "='" + holder.quantity.getText() + "' WHERE ("
                        + SQLHelper.KEY_ID + "='" + holder.id.getText() + "')");
                database.execSQL("UPDATE " + SQLHelper.DATABASE_TABLE + " SET " + SQLHelper.PRICE_NAME + "='" + holder.price.getText() + "' WHERE ("
                        + SQLHelper.KEY_ID + "='" + holder.id.getText() + "')");
                Log.d("glavniy", DatabaseUtils.dumpCursorToString(database.rawQuery("SELECT * FROM " + SQLHelper.DATABASE_TABLE, null)));
            }
        });
        holder.down.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (Integer.parseInt(holder.quantity.getText().toString()) != 1) {
                    holder.quantity.setText(String.valueOf(Integer.parseInt(holder.quantity.getText().toString())-1));
                    int o1 = Integer.parseInt(holder.price.getText().toString().replace("$","")) - Integer.parseInt(holder.startprice.getText().toString());
                    holder.price.setText(o1 + "$");
                    database.execSQL("UPDATE " + SQLHelper.DATABASE_TABLE + " SET " + SQLHelper.QUANTITY_NAME + "='" + holder.quantity.getText() + "' WHERE ("
                            + SQLHelper.KEY_ID + "='" + holder.id.getText() + "')");
                    database.execSQL("UPDATE " + SQLHelper.DATABASE_TABLE + " SET " + SQLHelper.PRICE_NAME + "='" + holder.price.getText() + "' WHERE ("
                            + SQLHelper.KEY_ID + "='" + holder.id.getText() + "')");
                    Log.d("glavniy", DatabaseUtils.dumpCursorToString(database.rawQuery("SELECT * FROM " + SQLHelper.DATABASE_TABLE, null)));
                }
            }
        });
    }
}

@Override
public int getItemCount() {
    return otitles.size();
}

@SuppressLint("StaticFieldLeak")
public class myViewHolder extends RecyclerView.ViewHolder {
    public TextView title, price, ingridients, dependencies, up,down, quantity, startprice, id;
    public ImageView imageView;
    public ImageView delete;
    public myViewHolder(@NonNull View itemView) {
        super(itemView);
        
        id=itemView.findViewById(R.id.textView7);
        startprice=itemView.findViewById(R.id.textView6);
        quantity = itemView.findViewById(R.id.ordersQuanity);
        up=itemView.findViewById(R.id.upBtn);
        down=itemView.findViewById(R.id.downBtn);
        delete=itemView.findViewById(R.id.removeButton);
        title = itemView.findViewById(R.id.titleOfOrder);
        price = itemView.findViewById(R.id.priceOfOrder);
        imageView=itemView.findViewById(R.id.imageOfOrde);
        ingridients = itemView.findViewById(R.id.ingridientsOfOrder);
        dependencies = itemView.findViewById(R.id.dependenciesOfOrder);
    }
}

}

我如何才能准确返回 PARENT RecyclerView 发送的（该位置的）列表的大小？

4

2 回答 2

0

哦...这真的很难阅读。我将尝试为您提供一些更好的架构的提示。我希望你没事。

  1. 为什么要使用这么多列表？为什么您不使用所有数据（如标题、图像、成分 itp）制作一份自定义 madr 类列表。
  2. 为什么你将类的类型命名为 recyclercart 而不是 RecyclerCard。在 Kotlin 和 Java 中，程序员没有写规则，类应该用大写字母和驼峰式命名。
  3. 另一件事是您使用数据库将数据融合在一起并将数据上传到视图进程中。这不好。最好有其他类，如 DatabaseManager 或类似的东西，这将完成从数据库等获取数据的工作。如果你这样做，你的 RecyclerViewAdapter 将在构造函数中获得准备好的项目列表，并且唯一的责任是这个类将在视图中显示数据。代码将被简化，也许错误会更明显。如果您想动态上传子数据（在滚动期间），您可以使用 cab，但它的代码也应该放在 DatabaseManager 或 Helper 中。如果数据数量不大-最好在创建适配器之前上传它，然后只放 Map<Item,List 代替。
  4. 我还会检查使用 SQLiteHelper 的方式。我不确定，但有件事告诉我你在一个程序中创建了几个数据库。它可能是危险的。请检查一下。请记住创建一次数据库并连接几次。关于这个我不确定。我有更少的时间来调查你的代码。

关于我的提示：结帐 SOLID；您将拥有更清晰的架构。

于 2021-02-09T19:20:18.487 回答
0

好的，我终于找到了解决方案。这很有趣，但问题是 ArrayLists 是静态的。所以我刚刚删除了static字段，现在一切正常。

于 2021-02-13T15:11:29.030 回答