Java Getter和setter在recyclerview android中未按预期工作
我从volley post请求中获取json值。我使用setter方法将这些值添加到列表中。在adapter onBindViewholder方法中检索值并在recyclerview中显示时,结果未按预期显示: 下面的代码是指在MainActivity.java中向列表中添加来自volley请求和响应的值:Java Getter和setter在recyclerview android中未按预期工作,java,android,android-adapter,android-recyclerview,Java,Android,Android Adapter,Android Recyclerview,我从volley post请求中获取json值。我使用setter方法将这些值添加到列表中。在adapter onBindViewholder方法中检索值并在recyclerview中显示时,结果未按预期显示: 下面的代码是指在MainActivity.java中向列表中添加来自volley请求和响应的值: private ProductsPojo pojo; public static ProductsAdapter productsAdapter; private L
private ProductsPojo pojo;
public static ProductsAdapter productsAdapter;
private List<ProductsPojo> pojoList;
pojo = new ProductsPojo();
pojoList = new ArrayList<>();
StringRequest request = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
// Log.d("Appet8","Products response:"+response.toString());
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray products = jsonObject.getJSONArray("products");
for (int i=0;i<products.length();i++) {
JSONObject product_object = products.getJSONObject(i);
String name = product_object.getString("name");
String price = product_object.getString("price");
String product_id = product_object.getString("id");
String sessionname = product_object.getString("sessionname");
String image = product_object.getString("image");
String categoryname = product_object.getString("categoryname");
pojo.setName(product_object.getString("name"));
pojo.setImage(product_object.getString("image"));
pojoList.add(pojo);
}
productsAdapter = new ProductsAdapter(pojoList,getApplicationContext());
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// Toast.makeText(getApplicationContext(),error.getMessage(), Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() {
// Posting parameters to login url
Map<String, String> params = new HashMap<String, String>();
params.put("customer_id", customer_id);
return params;
}
};
AppController.getInstance().addToRequestQueue(request,tag_request);
下面的代码引用了显示值ProductsAdapter.java的适配器类:
public class ProductsAdapter extends RecyclerView.Adapter<ProductsAdapter.ProductsViewHolder> {
private List<ProductsPojo> productList;
private Context context;
public ProductsAdapter(List<ProductsPojo> productList,Context context) {
this.productList=productList;
this.context = context;
}
@Override
public ProductsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.
from(parent.getContext()).
inflate(R.layout.products_list, parent, false);
ProductsViewHolder holder = new ProductsViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(final ProductsViewHolder holder,final int position) {
final ProductsPojo pojo = productList.get(position);
Log.d("Appet8","Name:"+pojo.getName());
holder.vTitle.setText(pojo.getName());
holder.vTitle.setTypeface(MainActivity.font);
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
pojo.setSelected(!pojo.isSelected());
holder.itemView.setBackgroundColor(pojo.isSelected() ? Color.parseColor("#4D79CF08") : Color.parseColor("#2D6F6F6F"));
if(pojo.isSelected()) {
holder.selected.setVisibility(View.VISIBLE);
} else if(!pojo.isSelected()) {
holder.selected.setVisibility(View.GONE);
}
}
});
}
@Override
public int getItemCount() {
return productList.size();
}
public static class ProductsViewHolder extends RecyclerView.ViewHolder {
protected TextView vTitle;
protected ImageView image,selected;
protected CardView product_card;
public ProductsViewHolder(View v) {
super(v);
vTitle = (TextView) v.findViewById(R.id.title);
image = (ImageView) v.findViewById(R.id.product);
product_card = (CardView) v.findViewById(R.id.product_card);
selected = (ImageView) v.findViewById(R.id.selected);
}
}
}
这是我得到的输出。项目名称重复
以下代码引用ProductsPojo.java:
public class ProductsPojo {
public String name;
public String image;
private boolean isSelected = false;
public void setName(String name) {
this.name = name;
}
public void setImage(String image) {
this.image = image;
}
public String getName() {
return name;
}
public String getImage() {
return image;
}
public void setSelected(boolean selected) {
isSelected = selected;
}
public boolean isSelected() {
return isSelected;
}
}
在我看来,您只创建过一个ProductsPojo实例,如下所示:
pojo = new ProductsPojo();
然后在循环中不断修改这个实例,然后一次又一次地将其添加到列表中。这样,您将得到与列表中最后一个相同的项目,其数量是您在响应中得到的对象数量的两倍
您想要做的可能是每次在for循环开始时创建一个新的ProductsPojo,如下所示:
for (int i=0;i<products.length();i++) {
ProductsPojo pojo = new ProductsPojo();
JSONObject product_object = products.getJSONObject(i);
String name = product_object.getString("name");
String price = product_object.getString("price");
String product_id = product_object.getString("id");
String sessionname = product_object.getString("sessionname");
String image = product_object.getString("image");
String categoryname = product_object.getString("categoryname");
pojo.setName(product_object.getString("name"));
pojo.setImage(product_object.getString("image"));
pojoList.add(pojo);
}
在我看来,您只创建过一个ProductsPojo实例,如下所示:
pojo = new ProductsPojo();
然后在循环中不断修改这个实例,然后一次又一次地将其添加到列表中。这样,您将得到与列表中最后一个相同的项目,其数量是您在响应中得到的对象数量的两倍
您想要做的可能是每次在for循环开始时创建一个新的ProductsPojo,如下所示:
for (int i=0;i<products.length();i++) {
ProductsPojo pojo = new ProductsPojo();
JSONObject product_object = products.getJSONObject(i);
String name = product_object.getString("name");
String price = product_object.getString("price");
String product_id = product_object.getString("id");
String sessionname = product_object.getString("sessionname");
String image = product_object.getString("image");
String categoryname = product_object.getString("categoryname");
pojo.setName(product_object.getString("name"));
pojo.setImage(product_object.getString("image"));
pojoList.add(pojo);
}
好的将更新产品好的将更新产品好的将尝试这个。这个答案看起来很完美好的将尝试这个。这个答案看起来很完美