android - PreferenceFragment java.lang.RuntimeException -

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i follow sample provided commonsware in link single header

and when run it gave me force close below logcat ,

any advice appreciated ,

logcat : 

fatal exception: main  java.lang.runtimeexception: unable start activity componentinfo     {com.commonsware.android.pref1header/com.commonsware.android.pref1header.  fragmentsdemo}: android.view.inflateexception: binary xml file line #1: error    inflating class fragment @ android.app.activitythread.performlaunchactivity(activitythread.java:1651) @ android.app.activitythread.handlelaunchactivity(activitythread.java:1667) @ android.app.activitythread.access$1500(activitythread.java:117) @ android.app.activitythread$h.handlemessage(activitythread.java:935) @ android.os.handler.dispatchmessage(handler.java:99) @ android.os.looper.loop(looper.java:130) @ android.app.activitythread.main(activitythread.java:3687) @ java.lang.reflect.method.invokenative(native method) @ java.lang.reflect.method.invoke(method.java:507) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:867) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:625) @ dalvik.system.nativestart.main(native method)      caused by: android.view.inflateexception: binary xml file line #1: error           inflating class fragment @ android.view.layoutinflater.createviewfromtag(layoutinflater.java:587) @ android.view.layoutinflater.inflate(layoutinflater.java:386) @ android.view.layoutinflater.inflate(layoutinflater.java:320) @ android.view.layoutinflater.inflate(layoutinflater.java:276) @ com.android.internal.policy.impl.phonewindow.setcontentview      (phonewindow.java:216) @ android.app.activity.setcontentview(activity.java:1660) @ com.commonsware.android.pref1header.fragmentsdemo.oncreate       (fragmentsdemo.java:28) @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1047) @ android.app.activitythread.performlaunchactivity(activitythread.java:1615) ... 11 more    caused by: android.support.v4.app.fragment$instantiationexception: unable       instantiate fragment     com.commonsware.android.pref1header.preferencecontentsfragment: make sure class       name exists, public, , has empty constructor public @ android.support.v4.app.fragment.instantiate(fragment.java:401) @ android.support.v4.app.fragment.instantiate(fragment.java:369) @ android.support.v4.app.fragmentactivity.oncreateview(fragmentactivity.java:272) @ android.view.layoutinflater.createviewfromtag(layoutinflater.java:563) ... 19 more   caused by: java.lang.classnotfoundexception:     com.commonsware.android.pref1header.preferencecontentsfragment in loader    dalvik.system.pathclassloader[/data/app/com.commonsware.android.pref1header-1.apk] @ dalvik.system.pathclassloader.findclass(pathclassloader.java:240) @ java.lang.classloader.loadclass(classloader.java:551) @ java.lang.classloader.loadclass(classloader.java:511) @ android.support.v4.app.fragment.instantiate(fragment.java:391) ... 22 more

java class follow :

editpreferences:

 public class editpreferences extends preferenceactivity {    private boolean needresource=false;     @suppresswarnings("deprecation")   @override  public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);    if (needresource       || build.version.sdk_int < build.version_codes.honeycomb) {     addpreferencesfromresource(r.xml.preferences);          }        }    @override  public void onbuildheaders(list<header> target) {    if (onishidingheaders() || !onismultipane()) {     needresource=true;          }   else {      loadheadersfromresource(r.xml.preference_headers, target);         }       }     }

stockpreferencefragment:

  public class stockpreferencefragment extends preferencefragment {  @override   public void oncreate(bundle savedinstancestate) {    super.oncreate(savedinstancestate);   int res=       getactivity().getresources().getidentifier(getarguments().getstring          ("resource"), "xml",getactivity().getpackagename());         addpreferencesfromresource(res);              }         }

preferencecontentsfragment:

  public class preferencecontentsfragment extends fragment {       private textview checkbox=null;       private textview ringtone=null;       private textview checkbox2=null;       private textview text=null;       private textview list=null;   @override  public view oncreateview(layoutinflater inflater, viewgroup parent,             bundle savedinstancestate) {      view result=inflater.inflate(r.layout.content, parent, false);    checkbox=(textview)result.findviewbyid(r.id.checkbox);   ringtone=(textview)result.findviewbyid(r.id.ringtone);   checkbox2=(textview)result.findviewbyid(r.id.checkbox2);   text=(textview)result.findviewbyid(r.id.text);   list=(textview)result.findviewbyid(r.id.list);      return(result);       }    @override     public void onresume() {      super.onresume();     sharedpreferences prefs=       preferencemanager.getdefaultsharedpreferences(getactivity());    checkbox.settext(new boolean(prefs.getboolean("checkbox", false)).tostring());   ringtone.settext(prefs.getstring("ringtone", "<unset>"));   checkbox2.settext(new boolean(prefs.getboolean("checkbox2", false)).tostring());   text.settext(prefs.getstring("text", "<unset>"));   list.settext(prefs.getstring("list", "<unset>"));         }     }

fragmentsdemo:

  public class fragmentsdemo extends fragmentactivity {        @override      public void oncreate(bundle savedinstancestate) {       super.oncreate(savedinstancestate);       setcontentview(r.layout.main);          }    @override    public boolean oncreateoptionsmenu(menu menu) {    new menuinflater(this).inflate(r.menu.actions, menu);       return(super.oncreateoptionsmenu(menu));              }   @override  public boolean onoptionsitemselected(menuitem item) {     switch (item.getitemid()) {      case r.id.settings:        startactivity(new intent(this, editpreferences.class));          return(true);                }      return(super.onoptionsitemselected(item));       }      }

you better served letting eclipse run past point of exception , @ logcat.

that being said, problem is:

caused by: java.lang.classnotfoundexception: com.commonsware.android.pref1header.preferencecontentsfragment

if moved app own package, need adjust other files match, notably res/xml/preference_headers.xml.


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