花了幾個小時試圖弄清楚爲什麼在「魂」的方法不能由「下載」 類閱讀「finalURL」變量?會很感激任何指針..如何從另一個類訪問變量? Android的Java的
這是一個詞彙改良中的應用,所以它從字典API獲取XML數據。
public class DefineWord extends Activity {
static final String head = new String("http://www.dictionaryapi.com/api/v1/references/collegiate/xml/");
static final String apikey = new String("?key=xxxxxx-xxx-xxx-xxxx-xxxxx");
TextView src;
EditText searchBar;
OnCreate中:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.defineword);
src=(TextView)findViewById(R.id.textFromWeb);
searchBar = (EditText)findViewById(R.id.searchBar);
}
fetch方法:
public void fetch(View v){ //onClick in xml starts this "fetch" method
String w = searchBar.getText().toString(); // get the text the user enters into searchbar
String finalURL = head.trim() + w.trim() + apikey.trim(); //concatenate api url
Downloader d = new Downloader();
d.execute(finalURL); // Calls AsyncTask to connect in the background.
}
的AsyncTask:
class Downloader extends AsyncTask<String,Void,String>{
ArrayList<String> information = new ArrayList<String>(); // Store fetched XML data in ArrayList
public String doInBackground(String... urls) {
String result = null;
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
的問題是在這裏。 「finalURL」不能被解析爲一個變量。
Document doc = builder.parse(finalURL); //finalURL cannot be resolved to a variable ???
doc.getDocumentElement().normalize();
NodeList nList = doc.getElementsByTagName("entry"); // Make a list of all elements in XML file with tag name "entry"
for (int temp = 0; temp < nList.getLength(); temp++) { //Iterate over elements and get their attributes (Definition, etymology...)
Node nNode = nList.item(temp);
if (nNode.getNodeType() == Node.ELEMENT_NODE){
Element eElement = (Element) nNode;
String element = ("\nCurrent Element : " + eElement.getAttribute("id"));
information.add(element); //
String definitions = ("\nDefinition : \n" + eElement.getElementsByTagName("dt").item(0).getTextContent());
information.add(definitions);
}
}
}catch (ParserConfigurationException e){
e.printStackTrace();
}catch(SAXException e){
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}
return result;
}
protected void onPostExecute (String result){
String finalresult = information.toString();
src.setText(finalresult);
}
}
}
感謝您的時間。
哇!非常感謝。我不敢相信這很容易。大聲笑。希望你有美好的一天;希望你今天過得很開心。榮譽。 –