在 EditText 中输入内容后,如果快速向上或向下滚动,输入值将交换其在 RecyclerView 中另一个 EditText 中的位置。
在滚动之前,数据位于第一个 EditText 中。
上下滚动后,第一个 EditText 的值将其位置更改为第四个,并且交换是随机的。是否有任何解决方法来稳定数据。
这是模型类:
public class Product {
public int pId;
public String pName;
public double unit_price;
public double discount;
}
这是适配器类:
public class ProductAdapter extends RecyclerView.Adapter<ProductAdapter.ProductListHolder> {
Context context;
List<Product> productList;
public ProductAdapter(Context c, List<Product> lp){
this.context = c;
this.productList = lp;
}
public class ProductListHolder extends RecyclerView.ViewHolder{
TextView tvName;
TextView tvPrice;
TextView tvDiscount;
TextView tvTotal;
EditText etQuantity;
public ProductListHolder(View itemView) {
super(itemView);
tvName = (TextView) itemView.findViewById(R.id.tvName);
tvPrice = (TextView) itemView.findViewById(R.id.tvPrice);
tvDiscount = (TextView) itemView.findViewById(R.id.tvDiscount);
tvTotal = (TextView) itemView.findViewById(R.id.tvTotal);
etQuantity = (EditText) itemView.findViewById(R.id.etQuantity);
}
}
@Override
public ProductListHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.single_row, viewGroup, false);
ProductListHolder ph = new ProductListHolder(v);
return ph;
}
@Override
public void onBindViewHolder(final ProductListHolder productListHolder, final int i) {
productListHolder.tvName.setText(productList.get(i).pName);
productListHolder.tvPrice.setText(String.valueOf(productList.get(i).unit_price));
productListHolder.tvDiscount.setText(String.valueOf(productList.get(i).discount));
productListHolder.etQuantity.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (!s.toString().equals("")){
double totalPrice = (productList.get(i).unit_price-productList.get(i).discount)* (Double.valueOf(s.toString()));
productListHolder.tvTotal.setText(String.valueOf(totalPrice));
}
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
@Override
public int getItemCount() {
return productList.size();
}
}
这是 MainActivity:
public class MainActivity extends AppCompatActivity {
List<Product> productList;
RecyclerView recyclerView;
RecyclerView.Adapter mAdapter;
String[] names = {"A", "B", "C","D"};
double[] prices = {1000, 2000, 3000, 100};
double[] discounts = {10, 20, 30, 2};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initRecyclerView(); // Initializing Recycler View
new MyTask().execute();
}
public void initRecyclerView(){
recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
}
private class MyTask extends AsyncTask<Void, Void, List<Product>> {
@Override
protected List<Product> doInBackground(Void... params) {
int sz = 24;
productList = new ArrayList<Product>();
for(int i=0; i<sz; i++){
Product p = new Product();
p.pId = i%4;
p.pName = names[i%4];
p.unit_price = prices[i%4];
p.discount = discounts[i%4];
productList.add(p);
}
return productList;
}
@Override
protected void onPostExecute(List<Product> products) {
super.onPostExecute(products);
mAdapter = new ProductAdapter(MainActivity.this, productList);
recyclerView.setAdapter(mAdapter);
}
}
}
最佳答案
我认为你做得很好。但是您解决的问题可以很容易地解决。你只需要实现一个 Overridden 方法:
public int getItemViewType(int position) { return super.getItemViewType(position); }
代替-
return super.getItemViewType(position);
只是返回-
return position;
我认为您所有的问题都会以一种简单的方式得到解决。这是我稍微修改过的适配器类:
public class ProductAdapter extends RecyclerView.Adapter<ProductAdapter.ProductListHolder> {
Context context;
List<Product> productList;
public ProductAdapter(Context c, List<Product> lp) {
this.context = c;
this.productList = lp;
}
public class ProductListHolder extends RecyclerView.ViewHolder {
TextView tvName;
TextView tvPrice;
TextView tvDiscount;
TextView tvTotal;
EditText etQuantity;
public ProductListHolder(View itemView) {
super(itemView);
tvName = (TextView) itemView.findViewById(R.id.tvName);
tvPrice = (TextView) itemView.findViewById(R.id.tvPrice);
tvDiscount = (TextView) itemView.findViewById(R.id.tvDiscount);
tvTotal = (TextView) itemView.findViewById(R.id.tvTotal);
etQuantity = (EditText) itemView.findViewById(R.id.etQuantity);
}
}
@Override
public ProductListHolder onCreateViewHolder(ViewGroup viewGroup, final int i) {
View v = LayoutInflater.from(context).inflate(R.layout.single_row, viewGroup, false);
ProductListHolder ph = new ProductListHolder(v);
return ph;
}
@Override
public void onBindViewHolder(final ProductListHolder productListHolder, final int i) {
productListHolder.tvName.setText(productList.get(i).pName);
productListHolder.tvPrice.setText(String.valueOf(productList.get(i).unit_price));
productListHolder.tvDiscount.setText(String.valueOf(productList.get(i).discount));
productListHolder.etQuantity.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
productListHolder.tvTotal.setText(s.toString());
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
@Override
public int getItemCount() {
return productList.size();
}
@Override
public int getItemViewType(int position) {
return position;
}
}
关于android - 为什么在 RecyclerView 中滚动时 EditText 中的输入值会交换其位置?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32493958/