我有以下活动从后端加载产品。它是与paypal集成的在线食品订购。我在另一个应用程序中尝试了它的工作正常。
我在onCreate方法上遇到错误。
有三个活动项目列表，产品和产品列表适配器。加载视图时出错。当我评论适配器的线路没有崩溃但是在添加适配器后它崩溃了。它让我疯狂。
import com.flavorbaba.AppController;
import com.flavorbaba.Config;
import com.flavorbaba.Product;
import com.flavorbaba.ProductListAdapter;
import com.flavorbaba.ProductListAdapter.ProductListAdapterListener;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import com.android.volley.DefaultRetryPolicy;
import com.android.volley.Request.Method;
import com.android.volley.Response;
import com.android.volley.RetryPolicy;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.StringRequest;
import com.paypal.android.sdk.payments.PayPalConfiguration;
import com.paypal.android.sdk.payments.PayPalItem;
import com.paypal.android.sdk.payments.PayPalPayment;
import com.paypal.android.sdk.payments.PayPalPaymentDetails;
import com.paypal.android.sdk.payments.PayPalService;
import com.paypal.android.sdk.payments.PaymentActivity;
import com.paypal.android.sdk.payments.PaymentConfirmation;
public class ItemsList extends Activity implements ProductListAdapterListener {
private static final String TAG = ItemsList.class.getSimpleName();
private ListView listView;
private Button btnCheckout;
// To store all the products
private List<Product> productsList;
// To store the products those are added to cart
private List<PayPalItem> productsInCart = new ArrayList<PayPalItem>();
private ProductListAdapter adapter;
// Progress dialog
private ProgressDialog pDialog;
private static final int REQUEST_CODE_PAYMENT = 1;
// PayPal configuration
private static PayPalConfiguration paypalConfig = new PayPalConfiguration()
.environment(Config.PAYPAL_ENVIRONMENT).clientId(
Config.PAYPAL_CLIENT_ID);
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.food_menu);
listView = (ListView) findViewById(R.id.list);
btnCheckout = (Button) findViewById(R.id.checkout);
productsList = new ArrayList<Product>();
adapter = new ProductListAdapter(ItemsList.this, productsList, this);
pDialog = new ProgressDialog(this);
pDialog.setCancelable(false);
// Starting PayPal service
Intent intent = new Intent(this, PayPalService.class);
intent.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, paypalConfig);
startService(intent);
// Checkout button click listener
btnCheckout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Check for empty cart
if (productsInCart.size() > 0) {
launchPayPalPayment();
} else {
Toast.makeText(getApplicationContext(),
"Cart is empty! Please add few products to cart.",
Toast.LENGTH_SHORT).show();
}
}
});
// Fetching products from server
fetchProducts();
}
/**
* Fetching the products from our server
* */
private void fetchProducts() {
// Showing progress dialog before making request
pDialog.setMessage("Fetching products...");
showpDialog();
// Making json object request
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.GET,
Config.URL_PRODUCTS, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
Log.d(TAG, response.toString());
try {
JSONArray products = response
.getJSONArray("products");
// looping through all product nodes and storing
// them in array list
for (int i = 0; i < products.length(); i++) {
JSONObject product = (JSONObject) products
.get(i);
String id = product.getString("p_id");
String name = product.getString("p_name");
String description = product
.getString("p_desc");
String image = product.getString("p_image");
BigDecimal price = new BigDecimal(product
.getString("p_price"));
String sku = product.getString("p_status");
Product p = new Product(id, name, description,
image, price, sku);
productsList.add(p);
}
listView.setAdapter(adapter);
// notifying adapter about data changes, so that the
// list renders with new data
adapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),
"Error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
// hiding the progress dialog
hidepDialog();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
// hide the progress dialog
hidepDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(jsonObjReq);
}
/**
* Verifying the mobile payment on the server to avoid fraudulent payment
* */
private void verifyPaymentOnServer(final String paymentId,
final String payment_client) {
// Showing progress dialog before making request
pDialog.setMessage("Verifying payment...");
showpDialog();
StringRequest verifyReq = new StringRequest(Method.POST,
Config.URL_VERIFY_PAYMENT, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d(TAG, "verify payment: " + response.toString());
try {
JSONObject res = new JSONObject(response);
boolean error = res.getBoolean("error");
String message = res.getString("message");
// user error boolean flag to check for errors
Toast.makeText(getApplicationContext(), message,
Toast.LENGTH_SHORT).show();
if (!error) {
// empty the cart
productsInCart.clear();
}
} catch (JSONException e) {
e.printStackTrace();
}
// hiding the progress dialog
hidepDialog();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "Verify Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
// hiding the progress dialog
hidepDialog();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("paymentId", paymentId);
params.put("paymentClientJson", payment_client);
return params;
}
};
// Setting timeout to volley request as verification request takes
// sometime
int socketTimeout = 60000;
RetryPolicy policy = new DefaultRetryPolicy(socketTimeout,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
verifyReq.setRetryPolicy(policy);
// Adding request to request queue
AppController.getInstance().addToRequestQueue(verifyReq);
}
/**
* Preparing final cart amount that needs to be sent to PayPal for payment
* */
private PayPalPayment prepareFinalCart() {
PayPalItem[] items = new PayPalItem[productsInCart.size()];
items = productsInCart.toArray(items);
// Total amount
BigDecimal subtotal = PayPalItem.getItemTotal(items);
// If you have shipping cost, add it here
BigDecimal shipping = new BigDecimal("0.0");
// If you have tax, add it here
BigDecimal tax = new BigDecimal("0.0");
PayPalPaymentDetails paymentDetails = new PayPalPaymentDetails(
shipping, subtotal, tax);
BigDecimal amount = subtotal.add(shipping).add(tax);
PayPalPayment payment = new PayPalPayment(
amount,
Config.DEFAULT_CURRENCY,
"Description about transaction. This will be displayed to the user.",
Config.PAYMENT_INTENT);
payment.items(items).paymentDetails(paymentDetails);
// Custom field like invoice_number etc.,
payment.custom("This is text that will be associated with the payment that the app can use.");
return payment;
}
/**
* Launching PalPay payment activity to complete the payment
* */
private void launchPayPalPayment() {
PayPalPayment thingsToBuy = prepareFinalCart();
Intent intent = new Intent(ItemsList.this, PaymentActivity.class);
intent.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, paypalConfig);
intent.putExtra(PaymentActivity.EXTRA_PAYMENT, thingsToBuy);
startActivityForResult(intent, REQUEST_CODE_PAYMENT);
}
/**
* Receiving the PalPay payment response
* */
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_CODE_PAYMENT) {
if (resultCode == Activity.RESULT_OK) {
PaymentConfirmation confirm = data
.getParcelableExtra(PaymentActivity.EXTRA_RESULT_CONFIRMATION);
if (confirm != null) {
try {
Log.e(TAG, confirm.toJSONObject().toString(4));
Log.e(TAG, confirm.getPayment().toJSONObject()
.toString(4));
String paymentId = confirm.toJSONObject()
.getJSONObject("response").getString("id");
String payment_client = confirm.getPayment()
.toJSONObject().toString();
Log.e(TAG, "paymentId: " + paymentId
+ ", payment_json: " + payment_client);
// Now verify the payment on the server side
verifyPaymentOnServer(paymentId, payment_client);
} catch (JSONException e) {
Log.e(TAG, "an extremely unlikely failure occurred: ",
e);
}
}
} else if (resultCode == Activity.RESULT_CANCELED) {
Log.e(TAG, "The user canceled.");
} else if (resultCode == PaymentActivity.RESULT_EXTRAS_INVALID) {
Log.e(TAG,
"An invalid Payment or PayPalConfiguration was submitted.");
}
}
}
private void showpDialog() {
if (!pDialog.isShowing())
pDialog.show();
}
private void hidepDialog() {
if (pDialog.isShowing())
pDialog.dismiss();
}
@Override
public void onAddToCartPressed(Product product) {
PayPalItem item = new PayPalItem(product.getname(), 1,
product.getprice(), Config.DEFAULT_CURRENCY, product.getsku());
productsInCart.add(item);
Toast.makeText(getApplicationContext(),
item.getName() + " added to cart!", Toast.LENGTH_SHORT).show();
}
}
--------------------------------------------------------------------------
import java.math.BigDecimal;
public class Product {
private String id, name, description, image, sku;
private BigDecimal price;
public Product() {
}
public Product(String id, String name, String description, String image,
BigDecimal price, String sku) {
this.id = id;
this.name = name;
this.description = description;
this.image = image;
this.price = price;
this.sku = sku;
}
public String getid() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getname() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getdescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getimage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public BigDecimal getprice() {
return price;
}
public String getsku() {
return sku;
}
}
---------------------------------------------------------------
package com.flavorbaba;
import com.flavorbaba.R;
import com.flavorbaba.AppController;
import java.util.List;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.NetworkImageView;
public class ProductListAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<Product> products;
private ProductListAdapterListener listener;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();
public ProductListAdapter(Activity activity, List<Product> feedItems,
ProductListAdapterListener listener) {
this.activity = activity;
this.products = feedItems;
this.listener = listener;
}
@Override
public int getCount() {
return products.size();
}
@Override
public Object getItem(int location) {
return products.get(location);
}
@Override
public long getItemId(int position) {
return position;
}
@SuppressLint("InflateParams")
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.list_item_product, null);
if (imageLoader == null)
imageLoader = AppController.getInstance().getImageLoader();
TextView name = (TextView) convertView.findViewById(R.id.productName);
TextView description = (TextView) convertView
.findViewById(R.id.productDescription);
TextView price = (TextView) convertView.findViewById(R.id.productPrice);
NetworkImageView image = (NetworkImageView) convertView
.findViewById(R.id.productImage);
Button btnAddToCart = (Button) convertView
.findViewById(R.id.btnAddToCart);
final Product product = products.get(position);
name.setText(product.getname());
description.setText(product.getdescription());
price.setText("Price: $" + product.getprice());
// user profile pic
image.setImageUrl(product.getimage(), imageLoader);
btnAddToCart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
listener.onAddToCartPressed(product);
}
});
return convertView;
}
public interface ProductListAdapterListener {
public void onAddToCartPressed(Product product);
}
}
答案 0 :(得分：0)
这是很多ta代码... 我想知道为什么你的Productlistadapter对象需要两个上下文以及为什么你把第一个上下文作为Item activity.this但是
这里的一个大问题是你试图在主线程上建立网络连接...当你在调试时处于严格模式时出现错误......