我正在尝试从同一个AsyncTask类中获取不同的值但是在执行第二行之后
bestsellerResult = new getProductsTask（）。execute（“4”）;
两个阵列将具有相同的值。
public class Splash extends Activity {
String bestsellerORoccassions;
ArrayList<productDetails> categoryProductsData;
ArrayList<productDetails> bestsellereData;
ArrayList<productDetails> occassionsData;
ArrayList<productDetails> bestsellerResult;
ArrayList<productDetails> occassionResult;
boolean internetConnection;
private productAdapter productAdapter;
GridView gridView;
ArrayList<productDetails> productDetailsArr = new ArrayList<productDetails>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
bestsellerORoccassions = "";
categoryProductsData = new ArrayList<>();
bestsellereData = new ArrayList<>();
occassionsData = new ArrayList<>();
occassionResult = new ArrayList<>();
bestsellerResult = new ArrayList<>();
internetConnection = UtilityClass.isInternetAvailable(getApplicationContext());
bestsellerORoccassions = "bestsellers";
if (internetConnection) {
occassionResult = new getProductsTask().execute("41");
bestsellerResult = new getProductsTask().execute("4");
} else {
Intent internet = new Intent(com.ecommerce.dell.ecommerce.Splash.this, NointernetConnection.class);
startActivity(internet);
finish();
}
}
public class getProductsTask extends AsyncTask<String, Void, ArrayList<productDetails>> {
JSONObject result = new JSONObject();
JSONObject result1 = new JSONObject();
String error = "";
JsonFunctions jsonFunctions = new JsonFunctions();
ArrayList<ArrayList<String>> return_products = new ArrayList<ArrayList<String>>();
private ArrayList<productDetails> getProductsDataFromJSON(JSONObject productsJSONObj) throws JSONException {
final String product_image = "image";
final String product_name = "name";
final String product_id = "id";
final String productRealPrice = "price";
final String getProductDiscount = "discount";
final String getProductDescreiption = "description";
final String getProductPercentage = "percentage";
JSONArray productsArray = productsJSONObj.getJSONArray("products");
for (int i = 0; i < productsArray.length(); i++) {
/*get JSON Object represent product info(Image-Name-Real Price - Discount)*/
JSONObject getProductInfo = productsArray.getJSONObject(i);
String pImage = getProductInfo.getString(product_image);
String pName = getProductInfo.getString(product_name);
String pID = getProductInfo.getString(product_id);
String pRealPrice = getProductInfo.getString(productRealPrice);
String pDiscount = getProductInfo.getString(getProductDiscount);
String pDescreiption = getProductInfo.getString(getProductDescreiption);
String pPercentage = getProductInfo.getString(getProductPercentage);
productDetailsArr.add(i, new productDetails(pName, pID, pRealPrice, pDiscount, pDescreiption, pImage, pPercentage));
}
Log.d("ProductDetails", "Product Details: ");
for (int i = 0; i < productDetailsArr.size(); i++) {
Log.d("ProductDetails", "Product Details: " + productDetailsArr.get(i).getProductID());
}
return productDetailsArr;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
// progressDialog.show();
Log.d("getProductsTask", "getProductsTask");
}
@Override
protected ArrayList<productDetails> doInBackground(String... params) {
result = jsonFunctions.getCategoryProducts(params[0], String.valueOf(0));
if (result == null) {
error = "null json object";
return null;
}
try {
if (result.getInt("success") == 1) {
return getProductsDataFromJSON(result);
}
} catch (Exception ex) {
error = ex.toString();
Log.d("getProductsTask", error);
}
return null;
}
@Override
protected void onPostExecute(ArrayList<productDetails> products) {
super.onPostExecute(products);
}
}
@Override
protected void onStop() {
super.onStop();
}
}
答案 0 :(得分：1)
您的AsyncTask更改并返回productDetailsArr，它始终是同一个实例，因为您将其声明为Splash类的成员并仅在那里实例化它。因此occassionResult和bestsellerResult与productDetailsArr的实例相同。
要解决此问题，只需从productDetailsArr课程中删除Splash，然后在ArrayList<productDetails> productDetailsArr = new ArrayList<productDetails>();方法中添加getProductsDataFromJSON()。
这应该有效：
public class Splash extends Activity {
String bestsellerORoccassions;
ArrayList<productDetails> categoryProductsData;
ArrayList<productDetails> bestsellereData;
ArrayList<productDetails> occassionsData;
ArrayList<productDetails> bestsellerResult;
ArrayList<productDetails> occassionResult;
boolean internetConnection;
private productAdapter productAdapter;
GridView gridView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
bestsellerORoccassions = "";
categoryProductsData = new ArrayList<>();
bestsellereData = new ArrayList<>();
occassionsData = new ArrayList<>();
occassionResult = new ArrayList<>();
bestsellerResult = new ArrayList<>();
internetConnection = UtilityClass.isInternetAvailable(getApplicationContext());
bestsellerORoccassions = "bestsellers";
if (internetConnection) {
occassionResult = new getProductsTask().execute("41");
bestsellerResult = new getProductsTask().execute("4");
} else {
Intent internet = new Intent(com.ecommerce.dell.ecommerce.Splash.this, NointernetConnection.class);
startActivity(internet);
finish();
}
}
public class getProductsTask extends AsyncTask<String, Void, ArrayList<productDetails>> {
JSONObject result = new JSONObject();
JSONObject result1 = new JSONObject();
String error = "";
JsonFunctions jsonFunctions = new JsonFunctions();
ArrayList<ArrayList<String>> return_products = new ArrayList<ArrayList<String>>();
private ArrayList<productDetails> getProductsDataFromJSON(JSONObject productsJSONObj) throws JSONException {
final String product_image = "image";
final String product_name = "name";
final String product_id = "id";
final String productRealPrice = "price";
final String getProductDiscount = "discount";
final String getProductDescreiption = "description";
final String getProductPercentage = "percentage";
// ********* instantiate the list here ***********
ArrayList<productDetails> productDetailsArr = new ArrayList<productDetails>();
JSONArray productsArray = productsJSONObj.getJSONArray("products");
for (int i = 0; i < productsArray.length(); i++) {
/*get JSON Object represent product info(Image-Name-Real Price - Discount)*/
JSONObject getProductInfo = productsArray.getJSONObject(i);
String pImage = getProductInfo.getString(product_image);
String pName = getProductInfo.getString(product_name);
String pID = getProductInfo.getString(product_id);
String pRealPrice = getProductInfo.getString(productRealPrice);
String pDiscount = getProductInfo.getString(getProductDiscount);
String pDescreiption = getProductInfo.getString(getProductDescreiption);
String pPercentage = getProductInfo.getString(getProductPercentage);
productDetailsArr.add(i, new productDetails(pName, pID, pRealPrice, pDiscount, pDescreiption, pImage, pPercentage));
}
Log.d("ProductDetails", "Product Details: ");
for (int i = 0; i < productDetailsArr.size(); i++) {
Log.d("ProductDetails", "Product Details: " + productDetailsArr.get(i).getProductID());
}
return productDetailsArr;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
// progressDialog.show();
Log.d("getProductsTask", "getProductsTask");
}
@Override
protected ArrayList<productDetails> doInBackground(String... params) {
result = jsonFunctions.getCategoryProducts(params[0], String.valueOf(0));
if (result == null) {
error = "null json object";
return null;
}
try {
if (result.getInt("success") == 1) {
return getProductsDataFromJSON(result);
}
} catch (Exception ex) {
error = ex.toString();
Log.d("getProductsTask", error);
}
return null;
}
@Override
protected void onPostExecute(ArrayList<productDetails> products) {
super.onPostExecute(products);
}
}
@Override
protected void onStop() {
super.onStop();
}
}