Jasp3r

I have currently created a simple tcp socket client application that sends and receives messages from a dotnet server application I have created. The application itself actually works however there are a few things I would like to know if they are possible or not. Also this is my first ever droid application and my first ever java application so I am sure there is a better way to do what I have written so please go easy on me.

The problem that I am having is I need a way to monitor the status of the socket so that if the connection gets dropped whether it is from the server application ending or a network drop that the android client would disconnect and put a notification on the screen letting me know. Currently if I end the server application nothign happens on the client and it acts like the connection is still open. Granted this is probably due to the way I have it written so I am looking for samples or suggestions on how to change this so I can monitor this. Any help would be great. Eventually this will be put into a much larger project for my home but I am starting off small so I can do it correctly the first time rather than having someing messy later on.

My code is listed below.

Thanks
KJ

Source:

package com.kkearney.tcp1;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class TCPClient1Activity extends Activity {
public static final int BUFFER_SIZE = 2048;
private Socket sck = null;
private PrintWriter out = null;
private BufferedReader in = null;

Button btnSend;
Button btnConnect;
Button btnDisconnect;
EditText textOut;
TextView textIn;
String response = "";
final Handler handler = new Handler();
final Runnable updateUI = new Runnable() {
public void run() {
textIn.setText(response);
}
};

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

textOut = (EditText)findViewById(R.id.txtSend);
textIn = (TextView)findViewById(R.id.txtMSG);
btnSend = (Button)findViewById(R.id.btnSend);
btnConnect = (Button)findViewById(R.id.btnConnect);
btnDisconnect = (Button)findViewById(R.id.btnDisconnect);
}

public void ConnectUp(View view){
OpenConnection();
}


public void OpenConnection(){
new Thread(new Runnable(){
public void run(){
try{
if (sck == null){
sck = new Socket("10.0.0.135",8080);
sck.setKeepAlive(true);
screenConfig();

in = new BufferedReader(new InputStreamReader(sck.getInputStream()));
out = new PrintWriter(sck.getOutputStream());
sendDataWithString("testing 1 2 3");
int charsRead = 0;
char[] buffer = new char[BUFFER_SIZE];

while ((charsRead = in.read(buffer)) != -1) {
response += new String(buffer).substring(0, charsRead);
handler.post( updateUI );
}

screenConfig();
}
}
catch (IOException e) {
System.out.print(e+"");
}
catch (Exception e) {
System.out.print(e+"");
}
}
}).start();


}
public void screenConfig(){
if (sck.isClosed() == false){
textOut.setClickable(true);
btnSend.setClickable(true);
btnDisconnect.setClickable(true);
btnConnect.setClickable(false);
}else{
textOut.setClickable(false);
btnSend.setClickable(false);
btnDisconnect.setClickable(false);
btnConnect.setClickable(true);
}
}

public void SendMessage(View view){
sendDataWithString(textOut.getText().toString());
textOut.setText(null);
}
public void DisConnect(View view){
CloseConnection();
}

public void CloseConnection(){
if (sck != null) {
try {
sck.close();
screenConfig();
} catch (IOException e) {
e.printStackTrace();
} finally {
sck = null;
}
}
}

public void sendDataWithString(String message) {
if (message != null && sck != null) {
out.write(message);
out.flush();
}
}

}


main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
androidrientation="vertical" >
<TableRow
android:id="@+id/tableRow1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<Button
android:id="@+id/btnConnect"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Connect" androidnClick="ConnectUp" android:clickable="true"/>
<Button
android:id="@+id/btnDisconnect"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Disconnect" androidnClick="DisConnect" android:clickable="false"/>
</TableRow>
<EditText
android:id="@+id/txtSend"
android:layout_width="fill_parent"
android:layout_height="wrap_content" android:clickable="false">
<requestFocus />
</EditText>
<Button
android:id="@+id/btnSend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Send" androidnClick="SendMessage" android:clickable="false"/>
<TextView
android:id="@+id/txtMSG"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>