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copied!<p>Declare the variable as a instance variable and then initialize Linear Layout </p> <pre><code>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; } </code></pre> <p>Then</p> <pre><code>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); } </code></pre> <p>Example: Modify the below according to your requirement.</p> <p><strong>fragment1.xml</strong></p> <pre><code><?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> </code></pre> <p><strong>Myfragment.java</strong></p> <pre><code>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); } } </code></pre> <p>Snap shot of my emulator</p> <p><img src="https://i.stack.imgur.com/4YWEc.png" alt="enter image description here"></p> <p>Edit :</p> <p><strong>activity-main.xml</strong></p> <pre><code><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> </code></pre> <p><strong>MainActivity.java</strong></p> <pre><code>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(); } }); } } </code></pre> <p><strong>Myfragment.java</strong></p> <pre><code>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); } } </code></pre>

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