How to pass values from a Class to Activity - Android
<p>I have a newbie question about Class/Task/Activity. I'm coming from C so I don't know if it's a good approach to do what I need.</p>

<p>I've created a class:</p>

<pre><code>public class UDPServer {

    private MyDatagramReceiver myDatagramReceiver = null;

    private static int MAX_UDP_DATAGRAM_LEN = 1024;
    private static int UDP_SERVER_PORT = 5000;

    public void start() {
        myDatagramReceiver = new MyDatagramReceiver();
        myDatagramReceiver.start();
    }

    public void kill() {
        myDatagramReceiver.kill();
    }

    private class MyDatagramReceiver extends Thread {
        private boolean bKeepRunning = true;
        private String lastMessage = "";

        public void run() {
            String message;
            byte[] lmessage = new byte[MAX_UDP_DATAGRAM_LEN];
            DatagramPacket packet = new DatagramPacket(lmessage, lmessage.length);
            DatagramSocket socket = null;

            try
            {
                socket = new DatagramSocket(UDP_SERVER_PORT);

                while(bKeepRunning)
                {
                    socket.receive(packet);
                    message = new String(lmessage, 0, packet.getLength());
                    lastMessage = message;

                    //Here should call activity method

                });
                }

            }
            catch (Throwable e)
            {
                e.printStackTrace();
            }
            finally
            {
                if (socket != null)
                {
                    socket.close();
                }
            }
        }

        public void kill() {
            bKeepRunning = false;
        }
    }
}
</code></pre>

<p>Inside my Activity I've:</p>

<pre><code>@Override
public void onResume() {
    super.onResume();

    mUDPServer = new UDPServer();
    mUDPServer.start();
}

@Override
public void onPause() {
    super.onPause();

    mUDPServer.kill();
}
</code></pre>

<p>Now, every time I received a packet I want that this thread/class pass received packet to an Activity method that elaborate(do some calculation or update some UI ecc..) this incoming data. But I can't figure how to do this, maybe my approach is not correct. I can place thread code inside Activity but it seems to make code less readable.</p>

<p>Suggestion how to do this?</p>

<p>@Anshul Jain CODE UPDATE:</p>

<pre><code>    public class Main_activity extends Activity implements Interface_UDPServer{
    TextView recived_message;

    UDPServer mUDPServer;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        recived_message = (TextView)findViewById(R.id.recived_message);
    }

    @Override
    public void onResume() {
        super.onResume();

        mUDPServer = new UDPServer(this);
        mUDPServer.start();
    }

    @Override
    public void onPause() {
        super.onPause();

        mUDPServer.kill();
    }

    public void sendData(final String str){
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                recived_message.setText(str);
            }
        });
    }

}
</code></pre>

<p>XML file</p>

<pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" &gt;
    &lt;LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_below="@+id/linearLayout"
        android:layout_alignLeft="@+id/linearLayout"
        android:layout_alignStart="@+id/linearLayout"&gt;
    &lt;TextView
        android:id="@+id/recived_message"
        android:layout_width="200dp"
        android:layout_height="35dp"
        android:textColor="#444444"
        android:textSize="20dp" /&gt;
    &lt;/LinearLayout&gt;
&lt;/RelativeLayout&gt;
</code></pre>