android - How to inflate view inside fragment -

if try inflate view within fragment getting null.. example:

public view oncreateview(layoutinflater inflater, viewgroup container,                          bundle savedinstancestate) {     // here inflate view using layout id & return.     return view; } 

whenever button clicked need create dynamic view e.g.: button & add linearlayout. perform operation inside fragment class this:

public void addplaces() {         button button = new button(null);     button.settext("button name");     // e.g. adding button enter code here linear layout     linearlayout.addview(button);  } 

so, if inflate linearlayout inside oncreateview , use in add class, i'm getting null. how achieve?

declare variable instance variable , initialize linear layout

linearlayout linearlayout;  public view oncreateview(layoutinflater inflater, viewgroup container,                          bundle savedinstancestate) {     view rootview = inflater.inflate(r.layout.fragment1, container, false);     linearlayout = (linearlayout) rootview.findviewbyid(r.id.linearlayout);     return rootview; } 

then

public void addplaces() {     button button = new button(getactivity());     // needs activity context     // fragment hosted activity. use getactivity() context of hosting activity.      button.settext("button name");     linearlayout.addview(button); } 

example: modify below according requirement.

fragment1.xml

<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent" >      <button         android:id="@+id/button1"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignparentbottom="true"         android:layout_centerhorizontal="true"         android:text="button" />      <linearlayout         android:layout_width="fill_parent"         android:id="@+id/linearlayout"         android:layout_height="fill_parent"         android:layout_above="@+id/button1"         android:layout_alignparenttop="true"         android:layout_centerhorizontal="true"         android:orientation="vertical" >     </linearlayout>  </relativelayout> 

myfragment.java

public class myfragment extends fragment {      linearlayout linearlayout;     view rootview;      @override     public void onactivitycreated(bundle savedinstancestate) {         super.onactivitycreated(savedinstancestate);         button b = (button) rootview.findviewbyid(r.id.button1);         b.setonclicklistener(new onclicklistener() {              @override             public void onclick(view v) {                 // todo auto-generated method stub                 addplaces();             }          });         linearlayout = (linearlayout) rootview.findviewbyid(r.id.linearlayout);     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {         rootview = inflater.inflate(r.layout.fragment1, container, false);         return rootview;     }      public void addplaces() {         button button = new button(getactivity()); // needs activity context         button.settext("button name");         linearlayout.addview(button);     } } 

snap shot of emulator

edit :

activity-main.xml

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:paddingbottom="@dimen/activity_vertical_margin"     android:paddingleft="@dimen/activity_horizontal_margin"     android:paddingright="@dimen/activity_horizontal_margin"     android:paddingtop="@dimen/activity_vertical_margin"     tools:context=".mainactivity" >       <fragment android:name="com.example.fragments.myfragment"             android:id="@+id/frag"             android:layout_above="@+id/button1"             android:layout_width="fill_parent"             android:layout_height="fill_parent" />        <button           android:id="@+id/button1"           android:layout_width="wrap_content"           android:layout_height="wrap_content"           android:layout_alignparentbottom="true"           android:layout_centerhorizontal="true"           android:text="button" />  </relativelayout> 

mainactivity.java

public class mainactivity extends fragmentactivity {     button b;     myfragment fragment;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         fragmentmanager fragmentmanager = getsupportfragmentmanager();         fragmenttransaction fragmenttransaction = fragmentmanager.begintransaction();         fragment = new myfragment();         fragmenttransaction.add(r.id.frag, fragment);         fragmenttransaction.commit();         b = (button) findviewbyid(r.id.button1);         b.setonclicklistener(new onclicklistener() {              @override             public void onclick(view v) {                 // todo auto-generated method stub                 fragment.addplaces();             }          });     } } 

myfragment.java

public class myfragment extends fragment {      linearlayout linearlayout;     view rootview;      @override     public void onactivitycreated(bundle savedinstancestate) {         super.onactivitycreated(savedinstancestate);         linearlayout = (linearlayout) rootview.findviewbyid(r.id.linearlayout);     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {         rootview = inflater.inflate(r.layout.fragment1, container, false);         return rootview;     }      public void addplaces() {         button button = new button(getactivity()); // needs activity context         button.settext("button name");         linearlayout.addview(button);     } }