我是Android和Java的新手。下面的代码从URL解析JSON数据并填充到ListView中。但是我有发送XML数据的URL,所以我想解析XML而不是JSON并在ListView中填充相同的内容。我需要对此代码进行哪些更改。如果您需要其他类代码,请告诉我。
public class RemoteFetchService extends Service {
private int appWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
private AQuery aquery;
private String remoteJsonUrl = "http://laaptu.files.wordpress.com/2013/07/widgetlist.key";
public static ArrayList<ListItem> listItemList;
private int count = 0;
@Override
public IBinder onBind(Intent arg0) {
return null;
}
/*
* Retrieve appwidget id from intent it is needed to update widget later
* initialize our AQuery class
*/
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent.hasExtra(AppWidgetManager.EXTRA_APPWIDGET_ID))
appWidgetId = intent.getIntExtra(
AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
aquery = new AQuery(getBaseContext());
fetchDataFromWeb();
return super.onStartCommand(intent, flags, startId);
}
/**
* method which fetches data(json) from web aquery takes params
* remoteJsonUrl = from where data to be fetched String.class = return
* format of data once fetched i.e. in which format the fetched data be
* returned AjaxCallback = class to notify with data once it is fetched
*/
private void fetchDataFromWeb() {
aquery.ajax(remoteJsonUrl, String.class, new AjaxCallback<String>() {
@Override
public void callback(String url, String result, AjaxStatus status) {
processResult(result);
super.callback(url, result, status);
}
});
}
/**
* Json parsing of result and populating ArrayList<ListItem> as per json
* data retrieved from the string
*/
private void processResult(String result) {
Log.i("Resutl", result);
listItemList = new ArrayList<ListItem>();
try {
JSONArray jsonArray = new JSONArray(result);
int length = jsonArray.length();
for (int i = 0; i < length; i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
ListItem listItem = new ListItem();
listItem.heading = jsonObject.getString("title");
listItem.content = jsonObject.getString("description");
listItem.imageUrl = jsonObject.getString("imageUrl");
listItemList.add(listItem);
}
storeListItem();
} catch (JSONException e) {
e.printStackTrace();
}
}
/**
* Instead of using static ArrayList as we have used before,no we rely upon
* data stored on database so saving the fetched json file content into
* database and at same time downloading the image from web as well
*/
private void storeListItem() {
DatabaseManager dbManager = DatabaseManager.INSTANCE;
dbManager.init(getBaseContext());
dbManager.storeListItems(appWidgetId, listItemList);
int length = listItemList.size();
for (int i = 0; i < length; i++) {
ListItem listItem = listItemList.get(i);
final int index = i;
aquery.ajax(listItem.imageUrl, Bitmap.class,
new AjaxCallback<Bitmap>() {
@Override
public void callback(String url, Bitmap bitmap,
AjaxStatus status) {
super.callback(url, bitmap, status);
storeBitmap(index, bitmap);
};
});
}
}
/**
* Saving the downloaded images into file and after all the download of
* images be complete begin to populate widget as done previously
*/
private void storeBitmap(int index, Bitmap bitmap) {
FileManager.INSTANCE.storeBitmap(appWidgetId, bitmap,
listItemList.get(index).heading, getBaseContext());
count++;
Log.i("count",
String.valueOf(count) + "::"
+ Integer.toString(listItemList.size()));
if (count == listItemList.size()) {
count = 0;
populateWidget();
}
}
/**
* Method which sends broadcast to WidgetProvider so that widget is notified
* to do necessary action and here action == WidgetProvider.DATA_FETCHED
*/
private void populateWidget() {
Intent widgetUpdateIntent = new Intent();
widgetUpdateIntent.setAction(WidgetProvider.DATA_FETCHED);
widgetUpdateIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
appWidgetId);
sendBroadcast(widgetUpdateIntent);
this.stopSelf();
}
}