How to get the ip address with an emulator android -

hello aim local address using emulator sdk 2.2. wrote code when run tell me close application. code

package exercice1.identificateur.ex;  import java.net.inetaddress; import java.net.networkinterface; import java.net.socketexception; import java.util.enumeration;  import android.app.listactivity; import android.os.bundle; import android.util.log; import android.widget.arrayadapter; import android.widget.textview; import exercice1.identificateur.r;  public class wifi1 extends listactivity {  private static final string log_tag = null;  public string getlocalipaddress() {      try {          (enumeration en = networkinterface.getnetworkinterfaces(); en.hasmoreelements();) {              networkinterface intf = en.nextelement();              (enumeration enumipaddr = intf.getinetaddresses(); enumipaddr.hasmoreelements();) {                  inetaddress inetaddress = enumipaddr.nextelement();                  if (!inetaddress.isloopbackaddress()) {                      return inetaddress.gethostaddress().tostring();                  }              }          }      } catch (socketexception ex) {          log.e(log_tag, ex.tostring());      }      return null;  }   public void oncreate(bundle savedinstancestate) {   super.oncreate(savedinstancestate);   setcontentview(r.layout.main);   textview tv = new textview(this);        tv.settext(getlocalipaddress());        setcontentview(tv);    } } 

this manifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"       package="exercice1.identificateur"       android:versioncode="1"       android:versionname="1.0">     <application android:icon="@drawable/icon" android:label="@string/app_name">         <activity android:name=".ex.wifi1"                   android:label="@string/app_name">             <intent-filter>                 <action android:name="android.intent.action.main" />                 <category android:name="android.intent.category.launcher" />             </intent-filter>         </activity>      </application>     <uses-sdk android:minsdkversion="8" />  <uses-configuration></uses-configuration> <uses-feature></uses-feature> <uses-permission android:name="android.permission.internet"></uses-permission><uses-permission android:name="android.permission.access_wifi_state"></uses-permission><uses-permission android:name="android.permission.change_wifi_state"></uses-permission><uses-sdk></uses-sdk> </manifest>  

i hope can me thank in advance

(i don't have device, use emulator installing in pc. possible?)

[edit] error:

12-01 17:13:23.154: error/ androidruntime(511): fatal exception: main 12-01 17:13:23.154: error/ androidruntime(511): java.lang.runtimeexception: unable start activity componentinfo{exercice1.identificateur/ exercice1.identificateur.ex.wifi1}: java.lang.runtimeexception: content must have listview id attribute 'android.r.id.list' 

very question warrenfaith. looks dalvikvm looking precompiled or generated class (ex.nomprenom). what's project structure? these files in project?

i think link in 1 of r files of package.