リサイクルアダプターで利用可能な製品の合計金額を取得し、別のフラグメントに渡す方法は？

Question

私はリサイクルアダプターのアイテムから合計価格を取得したいと思いますが、それから得ることはできません。 これは

public class CartHolder extends RecyclerView.ViewHolder { 
      TextView cartUPDTPrice,cartPRICE,cartDESC,cartTITLE; 
      ImageView cartIV,removeIMG,minusIMG,plusIMG; 

     public CartHolder(View itemView) { 
      super(itemView); 
      cartUPDTPrice = (TextView) itemView.findViewById(R.id.cartUPDTPrice); 
      cartPRICE = (TextView) itemView.findViewById(R.id.cartPRICE); 
      cartDESC = (TextView) itemView.findViewById(R.id.cartDESC); 
      cartTITLE = (TextView) itemView.findViewById(R.id.cartTITLE); 
      cartIV=(ImageView)itemView.findViewById(R.id.cartIV); 
      removeIMG=(ImageView)itemView.findViewById(R.id.removeIMG); 
      minusIMG=(ImageView)itemView.findViewById(R.id.minusIMG); 
      plusIMG=(ImageView)itemView.findViewById(R.id.plusIMG); 
     } 
    } 


    public void onBindViewHolder(final CartAdapter.CartHolder holder, int position) { 
     prodCART = cartPRO.get(holder.getAdapterPosition()); 
     holder.cartUPDTPrice.setText(prodCART.getPPrice().trim()); 
     holder.cartPRICE.setText(prodCART.getPName().trim()); 
     holder.cartDESC.setText(prodCART.getPName().trim()); 
     holder.cartTITLE.setText(prodCART.getPName().trim()); 
     holder.removeIMG.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       try { 
        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context); 
        alertDialogBuilder.setMessage("Are you sure,You wanted to Remove\n"+holder.cartTITLE.getText()); 
        alertDialogBuilder.setCancelable(false); 
        alertDialogBuilder.setPositiveButton("Yes", new DialogInterface.OnClickListener() { 
         @Override 
         public void onClick(DialogInterface arg0, int arg1) { 
          cartPRO.remove(holder.getAdapterPosition()); 
          notifyItemRemoved(holder.getAdapterPosition()); 
         } 
        }); 
        alertDialogBuilder.setNegativeButton("No", new DialogInterface.OnClickListener() { 
         @Override 
         public void onClick(DialogInterface dialogInterface, int i) { 

         } 
        }); 
        AlertDialog alertDialog = alertDialogBuilder.create(); 
        alertDialog.show(); 
       }catch (Exception e){ 
       } 
      } 
     }); 

    } 

は、今私は、アダプタに存在するすべての項目のcartPRICEのSUMをしたいと、カートの総計を表示フラグメントに渡し、アダプタの私のコードです。

Answer 1

あなたはどこでもあなたが望むint型アダプタがsum = sum + prodCART.getPPrice();と使用のように呼ばれるたびにint sum = 0のように1つのpublic static int型を取り、そのint型でバレスを追加することができます。

public static boolean add= true; 

あなたのonBindViewHolder（）;

if(add){ 
sum = sum + prodCART.getPPrice(); 
add= false; } 

Answer 2

Create the customListenerAction to get the control in fragment 

public interface CartActionListener{ 
void RemoveCardClicked(ArrayList<prodCART> remainingCartList); 
} 

pass the interface method in the RecycleAdapter Constructor 

public class CartHolder extends RecyclerView.ViewHolder { 
      TextView cartUPDTPrice,cartPRICE,cartDESC,cartTITLE; 
      ImageView cartIV,removeIMG,minusIMG,plusIMG; 
    CartActionListener cartActionListener 

     public CartHolder(View itemView ) { 
      super(itemView); 
this.CartActionListener =cartActionListener ; 
      cartUPDTPrice = (TextView) itemView.findViewById(R.id.cartUPDTPrice); 
      cartPRICE = (TextView) itemView.findViewById(R.id.cartPRICE); 
      cartDESC = (TextView) itemView.findViewById(R.id.cartDESC); 
      cartTITLE = (TextView) itemView.findViewById(R.id.cartTITLE); 
      cartIV=(ImageView)itemView.findViewById(R.id.cartIV); 
      removeIMG=(ImageView)itemView.findViewById(R.id.removeIMG); 
      minusIMG=(ImageView)itemView.findViewById(R.id.minusIMG); 
      plusIMG=(ImageView)itemView.findViewById(R.id.plusIMG); 
     } 
    } 


    public void onBindViewHolder(final CartAdapter.CartHolder holder, int position) { 
     prodCART = cartPRO.get(holder.getAdapterPosition()); 
     holder.cartUPDTPrice.setText(prodCART.getPPrice().trim()); 
     holder.cartPRICE.setText(prodCART.getPName().trim()); 
     holder.cartDESC.setText(prodCART.getPName().trim()); 
     holder.cartTITLE.setText(prodCART.getPName().trim()); 
     holder.removeIMG.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       try { 
        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context); 
        alertDialogBuilder.setMessage("Are you sure,You wanted to Remove\n"+holder.cartTITLE.getText()); 
        alertDialogBuilder.setCancelable(false); 
        alertDialogBuilder.setPositiveButton("Yes", new DialogInterface.OnClickListener() { 
         @Override 
         public void onClick(DialogInterface arg0, int arg1) { 
          cartPRO.remove(holder.getAdapterPosition()); 
          notifyItemRemoved(holder.getAdapterPosition()); 
          CartActionListener.RemoveCardClicked(cartPRO); 
         } 
        }); 
        alertDialogBuilder.setNegativeButton("No", new DialogInterface.OnClickListener() { 
         @Override 
         public void onClick(DialogInterface dialogInterface, int i) { 

         } 
        }); 
        AlertDialog alertDialog = alertDialogBuilder.create(); 
        alertDialog.show(); 
       }catch (Exception e){ 
       } 
      } 
     }); 

    } 


while creating the instance for the recycle Adapter pass the interface method 


new YourRecycleAdapter(this,cartPRO,new CartActionListener(){ 
public void RemoveCardClicked(ArrayList<prodCART> remainingCartList){ 
    //it will return your remaining updated list of prod cart 
    //based on the remaining cart list to do your calculation and update it in your fragment since you are adapter instance in fragment screen 

}); 

i guess it will work fine for you . Based on your code you may need some more changes on your code 

Answer 3