RSS Reader dengan J2ME
Untuk membuat aplikasi RSS Reader
di Java ME NetBeans dapat digunakan library KXML. Langkah-langkah pembuatannya
sebagai berikut :
1. Buka Netbeans. Klik menu
File-New Project. Pilih Categories : Java ME, Projects : Mobile
Application. Klik Next. Pada dialog berikutnya, isikan Project Name : MobileRSSReader.
Kemudian cek Set As Main Project dan hilangkan cek pada Create Hello Midlet. Klik
Next. Klik Next. Klik Finish.
2. Pada Project TreeView klik kanan,
pilih New – Visual Midlet. Kemudian akan muncul dialog, isikan Class Name : MNews,
package : my.apprsseader. Klik Finish. Akan ditampilkan MIDlet kosong pada
Design. Dari Palette Displayables tambahkan Form, kemudian ubah namanya menjadi
FMain. Kemudian pada Form FMain tambahkan itemCommand dan exitCommand dari
Pallete Commands. Ubah name dari itemCommand menjadi cmGet dan label-nya
menjadi “Get”. Setelah itu tarik garis dari MIDlet St
3. Pada Screen Design akan
ditampilkan Design dari FMain. Ubah title dari FMain menjadi “New Reader”,
kemudian tambahkan 1 buah TextField. Ubah name-nya menjadi tList. Kemudian ubah
property label dari TextField tersebut menjadi “News List”. Kemudian property
text-nya kosongkan, menjadi “”. Sehingga tampak seperti pada tampilan berikut
ini :
4. Pada cmGet, klik kanan pilih Go to
Source. Pada Source akan muncul kode program dari method public void
commandAction(), di dalamnya pada blok if (command == cmGet) { } tambahkan kode
program berikut :
public void commandAction(Command command,
Displayable displayable) {
// write pre-action user code here
if (displayable == FMain) {
if (command == cmGet) {
// write pre-action user code
here
try {
new Thread(new Runnable()
{
public void run()
{
try {
HttpConnection
conn;
DataInputStream
dis;
DataOutputStream dos;
conn =
(HttpConnection)
Connector.open("http://www.nytimes.com/services/xml/rss/nyt/National.xml");
conn.setRequestMethod(HttpConnection.GET);
conn.setRequestProperty("Content-Type", "text/xml");
dos = new
DataOutputStream(conn.openDataOutputStream());
dis = new
DataInputStream(conn.openDataInputStream());
if (conn.getResponseCode()
== HttpConnection.HTTP_OK) {
doParse(dis);
String
newsList = "";
for (int i
= 0; i < jumlah; i++) {
newsList = newsList + sTitle +
"\n";
newsList = newsList + sLink + "\n";
newsList = newsList + sDescription + "\n";
newsList = newsList + "--------------------------\n";
}
} else {
tList.setString("Koneksi Error");
}
} catch (Exception
e) {
}
}
}).start();
} catch (Exception e) {
}
// write post-action user code
here
} else if (command == exitCommand)
{
// write pre-action user code
here
exitMIDlet();
// write post-action user code
here
}
}
// write post-action user code here
}
5. Lanjutkan
untuk cmEdit, cmDelete, cmSave, cmCancel dan lainnya. Berikut ini kode program
selengkapnya :
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import java.io.*;
import java.io.*;
import org.kxml2.io.*;
import org.xmlpull.v1.*;
public class MNews extends MIDlet implements
CommandListener {
private
boolean midletPaused = false;
//<editor-fold defaultstate="collapsed" desc="
Generated Fields ">
private
Form FMain;
private
TextField tList;
…
private
KXmlParser parser;
private
int jumlah = 0;
private
String sTitle[] = new String[100];
private
String sLink[] = new String[100];
private
String sDescription[] = new String[100];
…
public
void commandAction(Command command, Displayable displayable) {
//
write pre-action user code here
if
(displayable == FMain) {
if
(command == cmGet) {
// write pre-action user code here
try {
new Thread(new Runnable()
{
public void run()
{
try {
HttpConnection
conn;
DataInputStream
dis;
DataOutputStream
dos;
conn =
(HttpConnection)
Connector.open("http://www.nytimes.com/services/xml/rss/nyt/National.xml");
conn.setRequestMethod(HttpConnection.GET);
conn.setRequestProperty("Content-Type",
"text/xml");
dos = new
DataOutputStream(conn.openDataOutputStream());
dis = new
DataInputStream(conn.openDataInputStream());
if (conn.getResponseCode() ==
HttpConnection.HTTP_OK) {
doParse(dis);
String
newsList = "";
for (int i
= 0; i < jumlah; i++) {
newsList =
newsList + sTitle + "\n";
newsList = newsList + sLink + "\n";
newsList = newsList + sDescription + "\n";
newsList = newsList +
"--------------------------\n";
}
} else {
tList.setString("Koneksi Error");
}
} catch (Exception e) {
}
}
}).start();
} catch (Exception e) {
}
// write post-action user code here
}
else if (command == exitCommand) {
// write pre-action user code here
exitMIDlet();
// write post-action user code here
}
}
//
write post-action user code here
}
…
public
void doParse(InputStream isxml) {
parser
= new KXmlParser();
try {
parser.setInput(new InputStreamReader(isxml));
parser.next();
parser.require(XmlPullParser.START_TAG, null, "rss");
parser.nextTag();
parser.require(XmlPullParser.START_TAG, null, "channel");
while (parser.nextTag() != XmlPullParser.END_TAG) {
parser.require(XmlPullParser.START_TAG, null, "title");
sTitle[jumlah] = new String("Title: " + parser.nextText());
parser.require(XmlPullParser.END_TAG, null, "title");
parser.nextTag();
parser.require(XmlPullParser.START_TAG, null, "link");
sLink[jumlah] = new String("Link: " + parser.nextText());
parser.require(XmlPullParser.END_TAG, null, "link");
parser.nextTag();
parser.require(XmlPullParser.START_TAG, null, "description");
sDescription[jumlah] = new String("Description: " +
parser.nextText());
parser.require(XmlPullParser.END_TAG, null, "description");
parser.nextTag();
}
parser.require(XmlPullParser.END_TAG, null, "channel");
jumlah++;
}
catch (Exception e) {
e.printStackTrace();
}
}
}
