Android Connection server-side socket

Package com.example.esp8266;

Import java.io.IOException;
Import Java.io.InputStream;
Import Java.io.OutputStream;
Import Java.io.PrintStream;
Import Java.net.Socket;

Import android.app.Activity;
Import Android.os.Bundle;
Import Android.os.Handler;
Import Android.os.Message;
Import Android.view.View;
Import Android.widget.Button;
Import Android.widget.EditText;
Import Android.widget.Toast;

public class Mainactivity extends Activity {
Private EditText edsend, edreceive;
Private Button btnconnect, btnsend;
Private Handler MyHandler;
Private Sendthread Sendthread;
Private Boolean isreceive = false;
Private Boolean isconnect = false;
private static final String HOST = "192.168.4.1";
private static final int PORT = 333;
String strmessage;
Socket socket = NULL;

@Override
protected void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.activity_main);
Edsend = (EditText) Findviewbyid (r.id.edsend);
Edreceive = (EditText) Findviewbyid (r.id.edreceive);
Btnconnect = (Button) Findviewbyid (r.id.btconnect);
Btnsend = (Button) Findviewbyid (r.id.btsend);
Connection
Btnconnect.setonclicklistener (New View.onclicklistener () {

public void OnClick (View v) {
TODO auto-generated Method Stub
if (!isconnect) {
New Thread (Connectthread). Start ();
Isconnect = true;
}
}
});
Send
Btnsend.setonclicklistener (New View.onclicklistener () {

public void OnClick (View v) {
Start Send Thread
New Thread (Sendthread). Start ();
}
});
MyHandler = new Handler () {//UI main thread Message handler function

public void Handlemessage (Message msg) {
Bundle bundle = Msg.getdata ();
String string = Bundle.tostring ();
Edreceive.settext (string);
}
};
}

Interfaces connected to the server
Runnable connectthread = new Runnable () {

public void Run () {
TODO auto-generated Method Stub
try {
Socket = new Socket (HOST, PORT);
if (socket! = NULL)
Toast.maketext (Getapplicationcontext (), "Connection succeeded",
Toast.length_long). Show ();
Else
Toast.maketext (Getapplicationcontext (), "Connection Failed",
Toast.length_long). Show ();
Initialize the Send thread
Sendthread = new Sendthread (socket);
} catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
}
};
interface to receive messages
Runnable Receive = new Runnable () {
InputStream instream;
Private byte[] buffer;
Private String str = NULL;

public void Run () {
TODO auto-generated Method Stub
while (!isreceive) {
Buffer = new BYTE[512];
try {
Instream = Socket.getinputstream ();
Instream.read (buffer);
} catch (IOException e) {
E.printstacktrace ();
}
str = new String (buffer);
Bundle bundle = new bundle ();
Bundle.get (str);
Message message = new Message ();
Message.setdata (bundle);
Myhandler.sendmessage (message);
}
}
};

Send Thread
Private class Sendthread extends Thread {
Private OutputStream outstream = null;

Private String str = NULL;

Sendthread (socket socket) {
try {
OutStream = Socket.getoutputstream ();
} catch (IOException e) {
E.printstacktrace ();
}
}

public void Run () {
while (true) {
str = Edsend.gettext (). toString (). Trim ();
PrintStream pt = new PrintStream (OutStream);
Pt.print (str);
New Thread (Receive). Start ();
// }
}
}

protected void OnDestroy () {
TODO auto-generated Method Stub
Super.ondestroy ();
if (Receive! = null) {
Isreceive = false;
(Thread) Receive). Interrupt ();
}
}

}

Android Connection server-side socket