CODEWITHSUNDEEP
javaandroidsocketsserversocket
Rushabh Patel
Rushabh Patel

Reputation: 3080

Unknown Hostname in Java Socket Programming

I have five domain server and i want to connect to that server using java socket programming in my android application.

Here my servers "ANY1.g%%%%%%%%.dk" "ANY2.g%%%%%%%%.dk" "ANY3.g%%%%%%%%.dk" "ANY4.g%%%%%%%%.dk" "ANY5.g%%%%%%%%.dk"

So when I ping to any of server via ping command in run prompt, it is working perfect and getting response.

but when i am trying to crate socket using this server it gives me "Unknown Host" error.

Here is my code:

try
{
    hostname = "ANY SERVER DOMAIN NAME";
    port = ANY;
    socket = new Socket(hostname, port);
    socket.setReceiveBufferSize(2048);
    socket.setKeepAlive(true);
    Log.e("SOCKET",socket.isConnected());
}
catch(Exception e)
{
    Log.e("ERROR",e.getMessage());
}

Is there any problem with code or any suggestion will be accepted?

Menifest file :

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.siliconithub.android.greencall"
    android:versionCode="1"
    android:versionName="1.0" >

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.WRITE_CONTACTS" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.SEND_SMS" />

<supports-screens
    android:anyDensity="true"
    android:largeScreens="true"
    android:normalScreens="true"
    android:resizeable="true"
    android:smallScreens="true" />

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="15" />

<application
    android:icon="@drawable/ic_app_icon"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".GreenCall"
        android:label="@string/title_activity_green_call"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".RecentCallActivity"
        android:label="@string/title_activity_recentcall"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
    </activity>
    <activity
        android:name=".RecentCallDetailActivity"
        android:label="@string/title_activity_recentcall_detail"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
    </activity>
    <activity
        android:name=".FavouritesActivity"
        android:label="@string/title_activity_fovourites"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
    </activity>
    <activity
        android:name=".ContactsActivity"
        android:label="@string/title_activity_contacts"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
    </activity>
    <activity
        android:name=".ContactDetailsActivity"
        android:label="@string/title_activity_contactdetails"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
    </activity>
    <activity
        android:name=".TelnetServerActivity"
        android:label="@string/title_activity_telnetserver"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
    </activity>
    <activity
        android:name=".SettingActivity"
        android:label="@string/title_activity_setting"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.Black" >
    </activity>
    <activity
        android:name=".SearchContactsActivity"
        android:label="@string/title_activity_search_contacts"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.NoTitleBar" >
    </activity>

    <service
        android:name=".UpdateStatusService"
        android:label="@string/title_service_update_status"
        android:icon="@drawable/ic_app_icon"
        android:enabled="true" />

    <receiver android:name=".PhoneStateBroadcastReceiver" >
        <intent-filter>
            <action android:name="android.intent.action.PHONE_STATE" />
        </intent-filter>
    </receiver>
</application>
</manifest>

thank you.

Upvotes: 1

Views: 1744

Answers (2)

brimborium
brimborium

Reputation: 9522

import java.net.Socket;
public class Main {
    public static void main(String[] args) {
        try {
            Socket socket = new Socket("%%%%.%%%%%.dk", PORT NUMBER);
            socket.setReceiveBufferSize(2048);
            socket.setKeepAlive(true);
            System.out.println("socket " + socket.isConnected());
        } catch (Exception e) {
            System.out.println("error " + e.getMessage());
        }
    }
}

This returns

socket true

In Java (no Android). It also works in Android (sherpya has tested it - see his comment below). I guess there is something wrong with your permissions. Can you show us your manifest?

Upvotes: 2

Guykun
Guykun

Reputation: 2779

The best way is to use an InetAddress+ SocketAddress to resolve the host, then connect to it using a socket. Try:

InetAddress addr = InetAddress.getByName("ANY1.g%%%%%%%.dk");
SocketAddress sockaddr = new InetSocketAddress(addr, 443);
socket = new Socket();
socket.connect(sockaddr, timeoutint)

Upvotes: 1

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