Code: Blackberry Facebook/Twitter Connect

Few days back I was struggling with Twitter and facebook API for blackberry. I have smash my head with different libraries available for twitter and facebook and finally have got the success by following the Eki Baskoro's Articals. So I just wanted to share the code given by Eki through my blog.

Comments by Eki : "The following is a short HOWTO on using Facebook Connect on Blackberry. I created a simple Facade encapsulating the Facebook REST API as well as added 'rough' MVC approach for screen navigation. I have tested on JDE 4.5 using 8320 simulator. This is still work in progress and all work is GPLed. "

BlackBerry FaceBook Connect:

See code sample provided by Eki Y. Baskoro: Blackberry Facebook SDK

BlackBerry Twitter Connect:

For example :

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.UnsupportedEncodingException;
import javax.microedition.io.Connector;
import javax.microedition.io.SocketConnection;
import net.rim.device.api.io.Base64OutputStream;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.BasicEditField;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.container.MainScreen;
public class TwittRest extends UiApplication{
    public TwittRest() {
        MyScreen myScreen = new MyScreen();
        pushScreen(myScreen);
    }
    public static void main(String args[]) {
        TwittRest myApp = new TwittRest();
        myApp.enterEventDispatcher();
    }
}
class MyScreen extends MainScreen implements FieldChangeListener {
    BasicEditField musername;
    BasicEditField mPassword;
    BasicEditField mStatus;
    private ButtonField mUpdateStatus;
    public MyScreen() {
        add(musername = new BasicEditField("username: ", ""));
        add(mPassword = new BasicEditField("password: ", ""));
        add(mStatus = new BasicEditField("status: ", ""));
        mUpdateStatus = new ButtonField(ButtonField.CONSUME_CLICK);
        mUpdateStatus.setLabel("update status");
        mUpdateStatus.setChangeListener(this);
        add(mUpdateStatus);
    }
    public void fieldChanged(Field field, int context) {
        if (mUpdateStatus == field) {
            String username = musername.getText().trim();
            String password = mPassword.getText().trim();
            String status = mStatus.getText().trim();
            updateStatus(username, password, status);
        }
    }
    void updateStatus(String username, String password, String status) {
        String response = "";
        try {
            String query = "status=" + urlEncode(status);
            String len = String.valueOf(query.length());
            SocketConnection hc = (SocketConnection) Connector
                    .open("socket://twitter.com:80");
            DataOutputStream dout =
                new DataOutputStream(hc.openOutputStream());
            DataInputStream din = new DataInputStream(hc.openInputStream());
            String userPass = username + ":" + password;
            byte[] encoded = Base64OutputStream.encode(userPass.getBytes(), 0,
                    userPass.length(), false, false);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            String request = "POST /statuses/update.json HTTP/1.1\r\n"
                    + "Host: twitter.com:80\r\n"
                    + "User-Agent: curl/7.18.0 (i486-pc-linux-gnu) " +
                            "libcurl/7.18.0 OpenSSL/0.9.8g zlib/1.2.3.3 " +
                            "libidn/1.1\r\n"
                    + "Accept: */*\r\n"
                    + "Content-Type: application/x-www-form-urlencoded\r\n"
                    + "Content-Length: " + len + "\r\nAuthorization: Basic "
                    + new String(encoded) + "\r\n\r\n";
            bos.write(request.getBytes());
            bos.write(query.getBytes());
            dout.write(bos.toByteArray());
            dout.flush();
            dout.close();
            byte[] bs = new byte[din.available()];
            din.readFully(bs);
            bos = new ByteArrayOutputStream();
            bos.write(bs);
            din.close();
            hc.close();
            response = bos.toString();
        } catch (Exception ex) {}
    }
    public static String urlEncode(String s) {
        if (s != null) {
            try {
                s = new String(s.getBytes("UTF-8"), "ISO-8859-1");
            } catch (UnsupportedEncodingException e) {
            }
            StringBuffer tmp = new StringBuffer();
            try {
                for (int i = 0; i < s.length(); i++) {
                    int b = (int) s.charAt(i);
                    if ((b >= 0x30 && b <= 0x39) || (b >= 0x41 && b <= 0x5A)
                            || (b >= 0x61 && b <= 0x7A)) {
                        tmp.append((char) b);
                    } else if (b == 0x20) {
                        tmp.append("+");
                    } else {
                        tmp.append("%");
                        if (b <= 0xf) {
                            tmp.append("0");
                        }
                        tmp.append(Integer.toHexString(b));
                    }
                }
            } catch (Exception e) {
            }
            return tmp.toString();
        }
        return null;
    }
}

Enjoy!

Wireless - Blackberry Codes And News

Saturday, May 1, 2010