How to inflate view inside fragment

Question

If I try to inflate a view within a fragment I am getting NULL.. For example:

public View onCreateView(LayoutInflater inflater, ViewGroup container,                          Bundle savedInstanceState) {     // Here I will inflate my view using the layout ID & return.     return view; } 

Whenever a button is clicked I need to create a dynamic view e.g.: button & add to the LinearLayout. I would like to perform this operation inside my fragment class like this:

public void addPlaces() {         Button button = new Button(null);     button.setText("button name");     // e.g. like adding button to enter code here linear layout     linearLayout.addView(button);  } 

So, if I get inflate LinearLayout inside onCreateView and use it in add class, I'm getting NULL. How to achieve?

Answer 1

Declare the variable as a instance variable and then 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 by a activity. use getActivity() to get the context of the hosting activity.      button.setText("button name");     linearlayout.addView(button); } 

Example: Modify the below according to your 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 my 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);     } }