public class CartActivityAdapter extends RecyclerView.Adapter<CartActivityAdapter.CartViewHolder> {
private List<Cart> cartList;
private OnClickItemFeed onClickItemFeed;
public CartActivityAdapter(List<Cart> cartList, OnClickItemFeed onClickItemFeed) {
this.cartList = cartList;
this.onClickItemFeed = onClickItemFeed;
}
@NonNull
@Override
public CartActivityAdapter.CartViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.activity_cart_adapter, viewGroup, false);
return new CartActivityAdapter.CartViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull CartActivityAdapter.CartViewHolder categoryViewHolder, int position) {
Cart cart = cartList.get(position);
categoryViewHolder.setImageShapeSquare(cart.getCartImage());
categoryViewHolder.setTextView1(cart.getCartName());
categoryViewHolder.setTextView2(cart.getCartModel());
categoryViewHolder.setTextView3(cart.getCartPrice());
}
@Override
public int getItemCount() {
return cartList == null ? 0 : cartList.size();
}
public class CartViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private ImageShapeSquare imageShapeSquare;
private TextView textView1, textView2, textView3;
private Button button;
public CartViewHolder(View view) {
super(view);
imageShapeSquare = view.findViewById(R.id.cart_adapter_image_square_square);
textView1 = view.findViewById(R.id.cart_adapter_text_view_1);
textView2 = view.findViewById(R.id.cart_adapter_text_view_2);
textView3 = view.findViewById(R.id.cart_adapter_text_view_3);
button = view.findViewById(R.id.cart_adapter_button);
button.setOnClickListener(this);
}
public void setImageShapeSquare(String string) {
if (imageShapeSquare == null) {
return;
}
new ImageLoader(imageShapeSquare.getContext()).fromNetwork(string, SaveLocation.Cache).to(imageShapeSquare);
}
public void setTextView1(String string) {
if (textView1 == null) {
return;
}
textView1.setText(string);
}
public void setTextView2(String string) {
if (textView2 == null) {
return;
}
textView2.setText(string);
}
public void setTextView3(String string) {
if (textView3 == null) {
return;
}
textView3.setText("₹ " + string);
}
@Override
public void onClick(View view) {
if (onClickItemFeed != null) {
onClickItemFeed.onClickItemFeed(getAdapterPosition(), view);
}
}
}
public interface OnClickItemFeed {
void onClickItemFeed(int position, View view);
}
}
这是我的视图持有者，我想从TextView 3中获取所有文本并添加值并以字符串形式获取它们
这是活动文件
public class CartActivity extends AppCompatActivity implements CartActivityAdapter.OnClickItemFeed {
private RecyclerView cart_recycler_view;
private List<Cart> cartList;
FirebaseDatabase firebaseDatabase;
DatabaseReference databaseReference;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cart);
firebaseDatabase = FirebaseDatabase.getInstance();
databaseReference = firebaseDatabase.getReference();
cart_recycler_view = findViewById(R.id.cart_recycler_view);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(CartActivity.this);
cart_recycler_view.setLayoutManager(linearLayoutManager);
cart_recycler_view.setHasFixedSize(true);
TextView cart_text_view = findViewById(R.id.cart_text_view);
Button cart_button = findViewById(R.id.cart_button);
}
private void cartRecyclerView(List<Cart> cartList) {
CartActivityAdapter cartActivityAdapter = new CartActivityAdapter(cartList, CartActivity.this);
cart_recycler_view.setAdapter(cartActivityAdapter);
}
@Override
protected void onResume() {
super.onResume();
cartList = new ArrayList<>();
databaseReference.child("Cart").child(Objects.requireNonNull(FirebaseAuth.getInstance().getUid())).getRef().addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
cartList.clear();
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
Cart cart = snapshot.getValue(Cart.class);
cartList.add(cart);
}
cartRecyclerView(cartList);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
@Override
public void onClickItemFeed(int position, View view) {
Cart cart = cartList.get(position);
switch (view.getId()) {
case R.id.cart_adapter_button:
String stringSKU;
stringSKU = cart.getCartSKU();
databaseReference.child("Cart").child(Objects.requireNonNull(FirebaseAuth.getInstance().getUid())).child(stringSKU).removeValue();
break;
}
}
}
答案 0 :(得分：0)
您需要的所有值都存储在适配器中，如我所见，该适配器为List<Cart>。总结一下：
double sum = 0.0;
double value = 0.0;
for(int i = 0; i < cartActivityAdapter.size(); i++)
try {
value = Double.parseDouble(cartActivityAdapter.get(i).getCartPrice());
} catch (NumberFormatException e) {
value = 0.0
}
sum += value;
}
sum现在拥有总数
如果要将总和放入TextView中：
textView.setText("" + sum);