android - Cannot show a dialogfragment within a fragment -

i have fragment, layout has button, , add click listener it, on onclick executes this:

    cfrag_fe_datepicker dp = new cfrag_fe_datepicker();     dp.show(getfragmentmanager(), "dp"); 

where cfrag_fe_datepicker dialogframent

however, fragment didn't pop up. set breakpoint inside onclick proc, breaks expected, , happily goes past dp.show() nothing happens.

i move button activity time works without problems.

why so?

here source of fragment, sorry if there many irrelevant codings here:

package com.prime.no2_andr;  import java.util.locale;  import android.os.bundle; import android.os.handler; import android.app.dialogfragment; import android.app.fragment; import android.app.fragmenttransaction; import android.support.v4.app.fragmentmanager; import android.support.v4.app.fragmentpageradapter; import android.support.v4.view.viewpager; import android.view.layoutinflater; import android.view.view; import android.view.view.onclicklistener; import android.view.viewgroup; import android.widget.textview;  public class cfrag_fe_datepicker extends dialogfragment implements onclicklistener{     viewpager mviewpager;     boolean isshowcal = true;     cfrag_dp fragdp = new cfrag_dp();     cfrag_cal fragcal = new cfrag_cal();     private final handler handler = new handler();     private runnable runpager;     boolean isloaded = false;     @override public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);  //      sectpageradp = new sectionspageradapter(getfragmentmanager()); //      mviewpager = (viewpager) getview().findviewbyid(r.id.pager); //      mviewpager.setadapter(sectpageradp);     }     @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {         // inflate layout fragment         view v = inflater.inflate(r.layout.frag_fe_datepicker, container, false);         v.findviewbyid(r.id.btn_more).setonclicklistener(this);         return v;     }      @override     public void onactivitycreated(bundle savedinstancestate)     {         super.onactivitycreated(savedinstancestate);         if (isloaded) return; //        isloaded = true; //        runpager = new runnable() { // //            @override //            public void run() ////            { //              getfragmentmanager().begintransaction().add(r.id.rl_cont, fragdp).commit(); //            } //        }; //        handler.post(runpager);     }      /**      * @see android.support.v4.app.fragment#onpause()      */     @override     public void onpause()     {         super.onpause(); //        handler.removecallbacks(runpager);     }      public void onclickmore(view btn) {      }     public fragmenttransaction execaddfrag(fragmenttransaction ft){          ft.add(r.id.rl_cont, //fragdp                 fragcal                 );         return ft;     }      public static class cfrag_dp extends cfrag_dp_cal {         public cfrag_dp() {             super(false);         }     }     public static class cfrag_cal extends cfrag_dp_cal {         public cfrag_cal() {             super(true);         }     }     public static abstract class cfrag_dp_cal extends fragment {         boolean iscal;         public cfrag_dp_cal(boolean in_iscal) {             iscal = in_iscal;         }         @override         public view oncreateview(layoutinflater inflater, viewgroup container,                                  bundle savedinstancestate) {             // inflate layout fragment             return inflater.inflate(                     iscal? r.layout.frag_fe_datepicker_cal : r.layout.frag_fe_datepicker_dp,                      container, false);         }      }      @override     public void onclick(view v) {         isshowcal = !isshowcal;         /*         getfragmentmanager().begintransaction()             .replace(r.id.rl_cont, isshowcal? fragcal : fragdp)             .commitallowingstateloss();             */ //      ((textview)getview().findviewbyid(r.id.textview1)).settext(isshowcal? "t":"f");      }   } 

if using nested fragments , call getfragmentmanager() on child fragment, fragmentmanager returned parent's getchildfragmentmanager() not hosting activity's fragmentmanager. try calling getactivity().getfragmentmanager() if that's case.