Client Server Communication in Android

Here the client is the android mobile and java app is acting as the server. The client code snippet is as follows:

Socket sock=null;

       PrintStream ps=null;

System.out.println(" Trying to connect");

                       

       try

       {

              InetAddress ip =InetAddress.getByName("localhost");

              sock=new Socket("112.207.67.208",1052);//give the ip and port no:

              PrintWriter out = new PrintWriter(new BufferedWriter(new

              OutputStreamWriter (sock.getOutputStream())), true);

               out.println(“Hellooo…”);

               sock.close();  

       }

       catch(SocketException e)

       {

              System.out.println("SocketException " + e);

       }

       catch(IOException e)

       {

              System.out.println("IOException " + e);

       }

The java server code is as follows:

public class Server

{

public static final int port = 1052;

public static void main( String args[])

{

Socket sock = null;

ObjectInputStream in;

String message="";

System.out.println(" Wait…… ");

try

{

ServerSocket sersock =  new ServerSocket(port);

System.out.println("Server Running  :"+sersock);

try

{

while(true)

{

sock = sersock.accept();

System.out.println("Client Connected  :"+ sock);

in = new ObjectInputStream(sock.getInputStream());

try

{

message = (String)in.readObject();

System.out.println(message);                   

}

]

catch(ClassNotFoundException classnot){

System.err.println(“Unknown data format");

}

}

sock.close();

}

catch(SocketException se)

{

System.out.println("Server Socket Exception  "+se.getMessage());

}

}

}

Creating a splashscreen in android

A splashscreen can be created in android using threads or countdown timer. Here I have done the splash screen using countdown timer. We have to include the image which we want to display in the <ImageView> in the xml file.

The main.xml file is as follows:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:weightSum="1">

<ImageView

android:layout_height="fill_parent"

android:layout_width="fill_parent"

android:src="@drawable/splash"

android:id="@+id/imageView1"

android:adjustViewBounds="true">

</ImageView>

</LinearLayout>

 

Next we want to have the java code for the splash screen. Here we want to display an image for 3 seconds and then advance to a new page. This is implemented using countdown timer and the code is as follows:

package pjt.eg.splash;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.os.CountDownTimer;

public class Splashscreen extends Activity

{

       public void onCreate(Bundle savedInstanceState)

       {

                      super.onCreate(savedInstanceState);

                      setContentView(R.layout.main);

                      creatingSplashScreen();  

       }

       private void creatingSplashScreen()

       {

              new CountDownTimer(3000, 1000)

              {

                     public void onTick(long millisUntilFinished)

                     {

             

                     }

                     public void onFinish()

                     {

                           movetohome();

                     }

               }.start();

       }

       private void movetohome()

       {

              Intent i = new Intent(this, Homepage.class);

              startActivity(i);

       }

}