以下是从项目列表中搜索的代码。但是它给出了json.JSONException：每次都没有ProductList错误的值并打印＆＃34;无法连接服务器请稍后再试＆＃34;。
来自Search.java的myAsyncTask类
class myAsyncTask extends AsyncTask<String, Void, String>{
JSONParser jParser;
JSONArray productList;
String url = new String();
String textSearch;
ProgressDialog pd;
@Override
protected void onPreExecute(){
super.onPreExecute();
productList = new JSONArray();
jParser = new JSONParser();
pd = new ProgressDialog(getActivity());
pd.setCancelable(false);
pd.setMessage("Searching....");
pd.getWindow().setGravity(Gravity.CENTER);
pd.show();
}
@Override
protected String doInBackground(String... sText){
url= "http://demo5657559.mockable.io/getitems"+sText[0];
String returnResult = getProductList(url);
this.textSearch = sText[0];
return returnResult;
}
public String getProductList(String url){
Product tempProduct = new Product();
String matchFound = "N";
Log.d("Tatheer", "productResults size - "+productResults.size());
try{
JSONObject json = jParser.getJSONFromUrl(url);
productList = json.getJSONArray("ProductList");
for(int i = 0; i<productList.length();i++){
tempProduct = new Product();
JSONObject obj = productList.getJSONObject(i);
tempProduct.setProductCode(obj.getString("ProductCode"));
tempProduct.setProductName(obj.getString("ProductName"));
tempProduct.setProductGrammage(obj.getString("ProductGrammage"));
tempProduct.setProductBarcode(obj.getString("ProductBarcode"));
tempProduct.setProductDivision(obj.getString("ProductCatCode"));
tempProduct.setProductDepartment(obj.getString("ProductSubCode"));
tempProduct.setProductMRP(obj.getString("ProductMRP"));
tempProduct.setProductBBPrice(obj.getString("ProductBBPrice"));
matchFound = "N";
for (int j = 0; j < productResults.size();j++){
if (productResults.get(j).getProductCode().equals(tempProduct.getProductCode())){
matchFound = "Y";
}
}
if (matchFound == "N"){
productResults.add(tempProduct);
}
}
Log.d("Tatheer", "productResults size - "+productResults.size());
return ("OK");
}
catch (Exception e){
e.printStackTrace();
return ("Exception Caught");
}
}
@Override
protected void onPostExecute(String result){
super.onPostExecute(result);
if (result.equalsIgnoreCase("Exception Caught")){
Toast.makeText(getActivity(), "Unable to connect Server please try later", Toast.LENGTH_LONG).show();
pd.dismiss();
}
else {
Log.d("Tatheer", "existing on PostExecute");
filterProductArray(textSearch);
searchResults.setAdapter(new SearchResultsAdapter(getActivity(), filteredProductResults));
pd.dismiss();
}
}
}
}
logcat的：
03-22 09:50:56.624 5733-5764/? W/System.err: org.json.JSONException: No value for ProductList
03-22 09:50:56.624 5733-5764/? W/System.err: at org.json.JSONObject.get(JSONObject.java:389)
03-22 09:50:56.624 5733-5764/? W/System.err: at org.json.JSONObject.getJSONArray(JSONObject.java:584)
03-22 09:50:56.624 5733-5764/? W/System.err: at com.zing.basket.Search$myAsyncTask.getProductList(Search.java:167)
03-22 09:50:56.624 5733-5764/? W/System.err: at com.zing.basket.Search$myAsyncTask.doInBackground(Search.java:151)
03-22 09:50:56.624 5733-5764/? W/System.err: at com.zing.basket.Search$myAsyncTask.doInBackground(Search.java:125)
03-22 09:50:56.624 5733-5764/? W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:295)
03-22 09:50:56.625 5733-5764/? W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
03-22 09:50:56.625 5733-5764/? W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
03-22 09:50:56.625 5733-5764/? W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
03-22 09:50:56.625 5733-5764/? W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
03-22 09:50:56.625 5733-5764/? W/System.err: at java.lang.Thread.run(Thread.java:818)
03-22 09:50:56.741 5733-5748/? E/Surface: getSlotFromBufferLocked: unknown buffer: 0xab3d3650
的Json
{
"ProductList":[
{
"ProductCode":"1",
"ProductName":"DALDA Cooking oil 1 LTR",
"ProductGrammage":"5g",
"ProductBarcode":"1234567891011",
"ProductCatCode":"EDIBLE GROCERY",
"ProductSubCode":"OIL/GHEE",
"ProductMRP":"100",
"ProductBBPrice": "120"
}
]}
请帮忙！
答案 0 :(得分：0)
url =“http://demo5657559.mockable.io/getitems”+ sText [0];
我认为你需要在URL中使用反斜杠。 向API开发人员询问调用web api的正确格式，并尝试使用url =“http://demo5657559.mockable.io/getitems/”+ sText [0];
请注意网址中添加的反斜杠。
如果网址不正确，您可能会收到端点未找到错误，并且响应中不会出现JSONArray“ProductList”。
答案 1 :(得分：0)
class myAsyncTask extends AsyncTask<String, Void, String>{
JSONParser jParser;
JSONArray productList;
String url = new String();
String textSearch;
ProgressDialog pd;
String sText[0]=null;
@Override
protected void onPreExecute(){
super.onPreExecute();
productList = new JSONArray();
jParser = new JSONParser();
pd = new ProgressDialog(getActivity());
pd.setCancelable(false);
pd.setMessage("Searching....");
pd.getWindow().setGravity(Gravity.CENTER);
pd.show();
}
@Override
protected String doInBackground(String... sText){
if(sText[0]!=null){
url= "http://demo5657559.mockable.io/getitems"+sText[0];
String returnResult = getProductList(url);
this.textSearch = sText[0];
return returnResult;
}else{
url= "http://demo5657559.mockable.io/getitems";
String returnResult = getProductList(url);
this.textSearch = sText[0];
return returnResult;
}
}
public String getProductList(String url){
Product tempProduct = new Product();
String matchFound = "N";
Log.d("Tatheer", "productResults size - "+productResults.size());
try{
JSONObject json = jParser.getJSONFromUrl(url);
productList = json.getJSONArray("ProductList");
for(int i = 0; i<productList.length();i++){
tempProduct = new Product();
JSONObject obj = productList.getJSONObject(i);
tempProduct.setProductCode(obj.getString("ProductCode"));
tempProduct.setProductName(obj.getString("ProductName"));
tempProduct.setProductGrammage(obj.getString("ProductGrammage"));
tempProduct.setProductBarcode(obj.getString("ProductBarcode"));
tempProduct.setProductDivision(obj.getString("ProductCatCode"));
tempProduct.setProductDepartment(obj.getString("ProductSubCode"));
tempProduct.setProductMRP(obj.getString("ProductMRP"));
tempProduct.setProductBBPrice(obj.getString("ProductBBPrice"));
matchFound = "N";
for (int j = 0; j < productResults.size();j++){
if (productResults.get(j).getProductCode().equals(tempProduct.getProductCode())){
matchFound = "Y";
}
}
if (matchFound == "N"){
productResults.add(tempProduct);
}
}
Log.d("Tatheer", "productResults size - "+productResults.size());
return ("OK");
}
catch (Exception e){
e.printStackTrace();
return ("Exception Caught");
}
}
@Override
protected void onPostExecute(String result){
super.onPostExecute(result);
if (result.equalsIgnoreCase("Exception Caught")){
Toast.makeText(getActivity(), "Unable to connect Server please try later", Toast.LENGTH_LONG).show();
pd.dismiss();
}
else {
Log.d("Tatheer", "existing on PostExecute");
filterProductArray(textSearch);
searchResults.setAdapter(new SearchResultsAdapter(getActivity(), filteredProductResults));
pd.dismiss();
}
}
}
}
答案 2 :(得分：0)
使用HttpUrlConnection获取JSON，然后解析字符串
示例
// Given a URL, establishes an HttpUrlConnection and retrieves
// the web page content as a InputStream, which it returns as
// a string.
private String downloadUrl(String myurl) throws IOException {
InputStream is = null;
// Only display the first 500 characters of the retrieved
// web page content.
int len = 500;
try {
URL url = new URL(myurl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("GET");
conn.setDoInput(true);
// Starts the query
conn.connect();
int response = conn.getResponseCode();
Log.d(DEBUG_TAG, "The response is: " + response);
is = conn.getInputStream();
// Convert the InputStream into a string
String contentAsString = readIt(is, len);
return contentAsString;
// Makes sure that the InputStream is closed after the app is
// finished using it.
} finally {
if (is != null) {
is.close();
}
}
}