ListFragment Cannot be cast to android.app.Activity -


facing error says my listfragment cannot cast android.app.activity. it's tablet app 2 pane layout , left side. getting crash not sure why. awesome.

code:

import android.os.bundle; import android.support.v4.app.fragment; import android.support.v4.app.fragmentmanager; import android.support.v4.app.fragmenttransaction; import android.support.v4.app.listfragment; import android.view.view; import android.widget.arrayadapter; import android.widget.listview; public class mainactivitytab extends listfragment {  fragmentmanager fm; fragmenttransaction ft; fragment myfragment;   @override   public void onactivitycreated(bundle savedinstancestate) {     super.onactivitycreated(savedinstancestate);     string[] values = new string[] { "player", "", "about this",         "the science", "information", "instructions", "pdf"};     arrayadapter<string> adapter = new arrayadapter<string>(getactivity(),         android.r.layout.simple_list_item_1, values);     setlistadapter(adapter);      fragmentmanager fm = getactivity().getsupportfragmentmanager();     fragmenttransaction ft = fm.begintransaction();      if (savedinstancestate == null){         fragment_11 myfragment = new fragment_11();         ft.add(r.id.content_layout, myfragment);         ft.commit(); }}    @override  public void onlistitemclick(listview l, view v, int position, long id){ fragment newfragment = null; fragmentmanager fm = getactivity().getsupportfragmentmanager(); switch(position){ case 0:     newfragment = new fragment_11();     break; case 1:     newfragment = new fragment_2();     break; case 2:     newfragment = new fragment_3();     break; case 3:     newfragment = new fragment_4();     break; case 4:     newfragment = new fragment_5();     break; case 5:     newfragment = new fragment_6();     break;  } fragmenttransaction ft = fm.begintransaction(); ft.replace(r.id.content_layout, newfragment); ft.addtobackstack(null) .commit();  }   }

error:

 09-04 12:07:24.897: e/androidruntime(32209): fatal exception: main  09-04 12:07:24.897: e/androidruntime(32209): java.lang.runtimeexception: unable instantiate activity componentinfo{com.appexample.sseconds/com.appexample.sseconds.mainactivitytab}: java.lang.classcastexception: com.appexample.sseconds.mainactivitytab cannot cast  android.app.activity  09-04 12:07:24.897: e/androidruntime(32209):   @ android.app.activitythread.performlaunchactivity(activitythread.java:2137)  09-04 12:07:24.897: e/androidruntime(32209):   @ android.app.activitythread.handlelaunchactivity(activitythread.java:2261)  09-04 12:07:24.897: e/androidruntime(32209):   @ android.app.activitythread.access$600(activitythread.java:141)  09-04 12:07:24.897: e/androidruntime(32209):   @ android.app.activitythread$h.handlemessage(activitythread.java:1256)  09-04 12:07:24.897: e/androidruntime(32209):   @ android.os.handler.dispatchmessage(handler.java:99)  09-04 12:07:24.897: e/androidruntime(32209):   @ android.os.looper.loop(looper.java:137)  09-04 12:07:24.897: e/androidruntime(32209):   @ android.app.activitythread.main(activitythread.java:5103)  09-04 12:07:24.897: e/androidruntime(32209):   @ java.lang.reflect.method.invokenative(native method)  09-04 12:07:24.897: e/androidruntime(32209):   @ java.lang.reflect.method.invoke(method.java:525)  09-04 12:07:24.897: e/androidruntime(32209):   @  com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:737)  09-04 12:07:24.897: e/androidruntime(32209):   @ com.android.internal.os.zygoteinit.main(zygoteinit.java:553)  09-04 12:07:24.897: e/androidruntime(32209):   @ dalvik.system.nativestart.main(native method)  09-04 12:07:24.897: e/androidruntime(32209): caused by: java.lang.classcastexception: com.appexample.sseconds.mainactivitytab cannot cast android.app.activity  09-04 12:07:24.897: e/androidruntime(32209):   @ android.app.instrumentation.newactivity(instrumentation.java:1061)  09-04 12:07:24.897: e/androidruntime(32209):   @ android.app.activitythread.performlaunchactivity(activitythread.java:2128)  09-04 12:07:24.897: e/androidruntime(32209):   ... 11 more

don't know crash, doing in wrong manner. it's bad practice start fragmenttransaction on activity inside fragment code. transaction manipulations in extends activity class. if need onlistitemclick events - can do

((myactivity) getactivity()).onlistitemclick()

to deliver event.


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