【发布时间】：2015-12-11 07:09:41
【问题描述】：
到目前为止，我已经做了很多。请你帮我在列表视图中加载图像下一步该怎么做。我已经使用 xml 解析解析了 url。我只想在列表视图中加载图像。请高手帮帮我！！
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
Bundle b = getIntent().getExtras();
m_brandName = b.getString("Brand_Name");
m_modelName = b.getString("Model_Name");
m_categoryName = b.getString("Category_Name");
actAppChartCatList = this;
//String url = "http://www.bitstechnologies.in/HellaWebserviceV2/Service1.asmx/populateBrandModelCategory?brandName=\" + m_brandName + \"&\" + \"modelName=\" + m_modelName + \"&\" + \"categoryName=\" + m_categoryName";
String url = "http://www.bitstechnologies.in/HellaWebserviceV2/Service1.asmx/populateBrandModelCategory?brandName=" + m_brandName + "&modelName=" + m_modelName + "&categoryName=" + m_categoryName;
String urlFinal = "";
if (url.contains(" "))
urlFinal = url.replace(" ", "%20");
else
urlFinal = url;
//new DownloadTaskCV().execute("http://www.bitstechnologies.in/HellaWebserviceV2/Service1.asmx/populateBrandModelCategory?brandName=" + m_brandName + "&" + "modelName=" + m_modelName + "&" + "categoryName=" + m_categoryName);
new DownloadTaskCV().execute(urlFinal);
pdGettingProducts = ProgressDialog.show(ActivityAppChartToCategoryList.this, "", "Getting Products.......");
setContentView(R.layout.activity_activity_app_chart_to_category_list);
mListView = (ListView) findViewById(R.id.showProductLists);
}
public static ActivityAppChartToCategoryList getInstance() {
return actAppChartCatList;
}
public void progDialogDownloadingDismiss() {
if (pdGettingProducts != null) {
pdGettingProducts.dismiss();
}
}
public void showEmptyMessage() {
progDialogDownloadingDismiss();
adb = new AlertDialog.Builder(this);
adb.setTitle("");
adb.setMessage("No products");
adb.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
onBackPressed();
}
});
adb.show();
}
/*
* A method to download json data from url
*/
private String downloadUrl(String strUrl) throws IOException {
String data = "";
InputStream iStream = null;
try {
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
Log.e("Response code : ", "" + urlConnection.getResponseCode());
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
sb.append(line);
}
data = sb.toString();
br.close();
} catch (Exception e) {
e.printStackTrace();
} finally {
iStream.close();
}
//pdDownloadingList.dismiss();
return data;
}
private class DownloadTaskCV extends AsyncTask<String, Integer, String> {
String data = null;
Product product = null;
ArrayList<Product> productslist = null;
@Override
protected String doInBackground(String... url) {
try {
data = downloadUrl(url[0]);
} catch (Exception e) {
e.printStackTrace();
}
return data;
}
@Override
protected void onPostExecute(String result) {
//super.onPostExecute(result);
try {
if ((result.equalsIgnoreCase("[]")) || (result == null)) {
showEmptyMessage();
this.cancel(true);
}
parseXmlResponse(result);
} catch (Exception e) {
showEmptyMessage();
this.cancel(true);
}
}
private String parseXmlResponse(String xmlResponse) {
if (xmlResponse != null) {
XmlPullParser myParser;
XmlPullParserFactory xmlFactoryObject;
try {
xmlFactoryObject = XmlPullParserFactory.newInstance();
myParser = xmlFactoryObject.newPullParser();
myParser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
int event;
String text = null;
event = myParser.getEventType();
while (event != XmlPullParser.END_DOCUMENT) {
String name = myParser.getName();
switch (event) {
case XmlPullParser.START_TAG:
if (name.equalsIgnoreCase("ProductList")) {
// instantiate Arraylist of "Products"
productslist = new ArrayList<>();
}
if (name.equalsIgnoreCase("Product_Name")) {
// instantiate object of Product
product = new Product();
}
break;
case XmlPullParser.TEXT:
text = myParser.getText();
break;
case XmlPullParser.END_TAG:
if (name.equalsIgnoreCase("Product_Name")) {
// prodObj.setProductName(text)
product.setProducts_name(text);
}
if (name.equalsIgnoreCase("Product_Image_Left")) {
// prodObj.setProductImageLeft(text)
product.setProducts_image(text);
// add the product object to the array List
productslist.add(product);
}
break;
default:
break;
} // end of switch
event = myParser.next();
}
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return xmlResponse;
}
}
【问题讨论】：
-
为什么你不能使用像 Picasso 这样的 ImageLoading 库 ....
-
谢谢@RameshBhupathi....这是一个简单的方法吗？
-
我还需要为那个写异步任务吗？
-
不，它将处理默认值。
-
你能告诉我在上面给出的文件中我应该把毕加索的代码行放在哪里吗？
标签： android listview android-asynctask