現在、Android リストビューの xml の解析に取り組んでいます。リストビューのデータを解析して取得できました。しかし、その XML から特定のデータを取得したい場合はどうすればよいでしょうか。うーん、SQL で何かを実行するような "select * from [table] where id = 1". そのようなもの...どうすれば私のXMLでそれを行うことができますか? ありがとう
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2 に答える
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public class XMLParsing_DisplayListviewActivity extends Activity {
String res1 = null;
InputStream is = null;
StringBuilder sb = null;
public String[] mCD;
public String[] mTitle;
public String[] mArtist;
public String[] mCountry;
public String[] mCompany;
public String[] mPrice;
public String[] mYear;
ListView listview;
ProgressDialog mDialog = null; // thread code
private Runnable viewOrders; // thread code
private Thread thread1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
listview=(ListView)findViewById(R.id.listview);
mDialog = new ProgressDialog(this); // thread code
mDialog.setMessage("Please wait...");
viewOrders = new Runnable(){
public void run(){
load();
runOnUiThread(returnRes);
}
};
thread1 = new Thread(null, viewOrders, "Background"); // thread
thread1.start(); // thread code
mDialog.show();
}
private Runnable returnRes = new Runnable(){
public void run(){
mDialog.cancel();
for(int i=0;i<mCD.length;i++){
System.out.println("======================");
System.out.println("Title :- "+mTitle[i]);
System.out.println("Artist :- "+mArtist[i]);
System.out.println("Country :- "+mCountry[i]);
System.out.println("Company :- "+mCompany[i]);
System.out.println("Price :- "+mPrice[i]);
System.out.println("Year :- "+mYear[i]);
}
listview.setAdapter(new CustomAdapter(XMLParsing_DisplayListviewActivity.this));
}
};
public void load() {
//mLoading = true;
Document doc = null;
HttpURLConnection urlConnection = null;
URL url = null;
try {
//url = new URL(urlString.toString());
url = new URL("http://www.xmlfiles.com/examples/cd_catalog.xml");
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
urlConnection.connect();
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
doc = db.parse(urlConnection.getInputStream());
} catch (Exception e) {
System.out.println("e"+e.toString());
}
try {
NodeList nodes = doc.getElementsByTagName("CD");
// iterate the employees
mCD=new String[nodes.getLength()];
mTitle=new String[nodes.getLength()];
mArtist=new String[nodes.getLength()];
mCountry=new String[nodes.getLength()];
mCompany=new String[nodes.getLength()];
mPrice=new String[nodes.getLength()];
mYear=new String[nodes.getLength()];
for (int i = 0; i < nodes.getLength(); i++) {
Element element = (Element) nodes.item(i);
NodeList cd = element.getElementsByTagName("CD");
Element line = (Element) cd.item(0);
mCD[i]=getCharacterDataFromElement(line);
NodeList title = element.getElementsByTagName("TITLE");
line = (Element) title.item(0);
mTitle[i]=getCharacterDataFromElement(line);
//System.out.println("catcatcatmidmidmidmidName: " + getCharacterDataFromElement(line));
NodeList artist = element.getElementsByTagName("ARTIST");
line = (Element) artist.item(0);
mArtist[i]=getCharacterDataFromElement(line);
//System.out.println("salary: " + getCharacterDataFromElement(line));
NodeList country = element.getElementsByTagName("COUNTRY");
line = (Element) country.item(0);
mCountry[i]=getCharacterDataFromElement(line);
NodeList company = element.getElementsByTagName("COMPANY");
line = (Element) company.item(0);
mCompany[i]=getCharacterDataFromElement(line);
NodeList price = element.getElementsByTagName("PRICE");
line = (Element) price.item(0);
mPrice[i]=getCharacterDataFromElement(line);
NodeList year = element.getElementsByTagName("YEAR");
line = (Element) year.item(0);
mYear[i]=getCharacterDataFromElement(line);
}
}
catch (Exception e) {
e.printStackTrace();
}
}
public static String getCharacterDataFromElement(Element e) {
Node child = e.getFirstChild();
if (child instanceof CharacterData) {
CharacterData cd = (CharacterData) child;
return cd.getData();
}
return "?";
}
public class CustomAdapter extends BaseAdapter {
private Context mContext;
Application app;
private LayoutInflater inflater=null;
public CustomAdapter(Context c) {
mContext = c;
inflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return mTitle.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
View vi=convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.list, null);
TextView txt=(TextView)vi.findViewById(R.id.txtview_title);
TextView txt1=(TextView)vi.findViewById(R.id.txtview_artist);
TextView txt2=(TextView)vi.findViewById(R.id.txtview_country);
TextView txt3=(TextView)vi.findViewById(R.id.txtview_company);
TextView txt4=(TextView)vi.findViewById(R.id.txtview_price);
TextView txt5=(TextView)vi.findViewById(R.id.txtview_year);
txt.setText("Title : " + mTitle[position]);
txt1.setText("Artist : " + mArtist[position]);
txt2.setText("Country : " + mCountry[position]);
txt3.setText("Company : " + mCompany[position]);
txt4.setText("Price : " + mPrice[position]);
txt5.setText("Year : " + mYear[position]);
return vi;
};
}
}
于 2013-04-24T08:23:34.427 に答える
0
xml ファイルを一度だけ解析し、そこからオブジェクトの配列またはリストを作成する必要があります。すべてをメモリ上に配置したら、配列を使用してリストにArrayAdapterを設定できます。配列内の位置を ID として使用できます。オブジェクトの属性を位置ではなく ID にしたい場合は、それに応じて配列を並べ替えることができます。
于 2013-02-22T02:56:05.013 に答える