java - app crashes when it starts after defining onClick method of an Actionbar Icon -

i started programming android apps few days ago , have problem when want build app multiple activities:

basically want settings activity clicking on icon implemented in actionbar.

i set onclick attribute of icon startsettings

public void startsettings(view view) {     intent intent = new intent(this, settingsactivity.class);     startactivity(intent); } 

in (menu) main.xml file ...

but when this, app crashes when want start it. weird thing is, when start method normal button in activity_main.xml file, works fine ... think problem in main.xml file. says in file method startsettings in 'mainactivity' has incorrect signature. , "checks if method specified in onclick xml attribute declared in related activity" don't know means ...:/

here error in console

e/androidruntime: fatal exception: main               process: com.example.kevs272.testing, pid: 31225               theme: themes:{default=overlay:com.ashok.nougatcm, fontpkg:com.ashok.nougatcm, com.android.systemui=overlay:com.ashok.nougatcm, com.android.systemui.navbar=overlay:com.cyngn.hexo}               android.view.inflateexception: couldn't resolve menu item onclick handler startsettings in class com.example.kevs272.testing.mainactivity                   @ android.support.v7.view.supportmenuinflater$inflatedonmenuitemclicklistener.<init>(supportmenuinflater.java:244)                   @ android.support.v7.view.supportmenuinflater$menustate.setitem(supportmenuinflater.java:444)                   @ android.support.v7.view.supportmenuinflater$menustate.additem(supportmenuinflater.java:479)                   @ android.support.v7.view.supportmenuinflater.parsemenu(supportmenuinflater.java:196)                   @ android.support.v7.view.supportmenuinflater.inflate(supportmenuinflater.java:118)                   @ com.example.kevs272.testing.mainactivity.oncreateoptionsmenu(mainactivity.java:23)                   @ android.app.activity.oncreatepanelmenu(activity.java:2852)                   @ android.support.v4.app.fragmentactivity.oncreatepanelmenu(fragmentactivity.java:360)                   @ android.support.v7.view.windowcallbackwrapper.oncreatepanelmenu(windowcallbackwrapper.java:88)                   @ android.support.v7.app.appcompatdelegateimplbase$appcompatwindowcallbackbase.oncreatepanelmenu(appcompatdelegateimplbase.java:331)                   @ android.support.v7.app.appcompatdelegateimplv9.preparepanel(appcompatdelegateimplv9.java:1353)                   @ android.support.v7.app.appcompatdelegateimplv9.doinvalidatepanelmenu(appcompatdelegateimplv9.java:1633)                   @ android.support.v7.app.appcompatdelegateimplv9$1.run(appcompatdelegateimplv9.java:132)                   @ android.os.handler.handlecallback(handler.java:739)                   @ android.os.handler.dispatchmessage(handler.java:95)                   @ android.os.looper.loop(looper.java:148)                   @ android.app.activitythread.main(activitythread.java:5461)                   @ java.lang.reflect.method.invoke(native method)                   @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:726)                   @ com.android.internal.os.zygoteinit.main(zygoteinit.java:616) 

and (menu) main.xml file

<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android"       xmlns:app="http://schemas.android.com/apk/res-auto">         <item     android:id="@+id/action_settings"     android:title="settings"     android:icon="@drawable/ic_settings_white_24dp"     app:showasaction="always"     android:onclick="startsettings" />      <item     android:id="@+id/action_about"     android:title="about"     android:icon="@drawable/ic_info_outline_white_24dp"     app:showasaction="always"     />  </menu> 

i recomend put function in on onmenuitemselected of activity this:

@override public boolean onmenuitemselected(int featureid, menuitem item) {     switch (item.getitemid()) {     case r.id.action_settings:         startsettings();         return true;     }     return super.onmenuitemselected(featureid, item); } 

and remove view param