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copied!<p>At some point, I suppose you will add your programatically created LinearLayout to some root layout that you defined in .xml. This is just a suggestion of mine and probably one of many solutions, but it works: Simply <strong>set an ID for the programatically created layout</strong>, and add it to the root layout that you defined in .xml, and then <strong>use the set ID to add the Fragment.</strong></p> <p>It could look like this:</p> <pre><code>LinearLayout rowLayout = new LinearLayout(); rowLayout.setId(whateveryouwantasid); // add rowLayout to the root layout somewhere here FragmentManager fragMan = getFragmentManager(); FragmentTransaction fragTransaction = fragMan.beginTransaction(); Fragment myFrag = new ImageFragment(); fragTransaction.add(rowLayout.getId(), myFrag , "fragment" + fragCount); fragTransaction.commit(); </code></pre> <p>Simply <strong>choose whatever Integer value you want</strong> for the ID:</p> <pre><code>rowLayout.setId(12345); </code></pre> <p>If you are using the above line of code not just once, it would probably be smart to <strong>figure out a way to create unique-IDs</strong>, in order to <strong>avoid duplicates</strong>.</p> <p><strong>UPDATE:</strong></p> <p><em>Here is the full code of how it should be done:</em> (this code is tested and works) I am adding two Fragments to a LinearLayout with horizontal orientation, resulting in the Fragments being aligned next to each other. Please also be aware, that <strong>I used a fixed height and width</strong> of 200dp, so that <strong>one Fragment does not use the full screen</strong> as it would with "match_parent".</p> <p><strong>MainActivity.java:</strong></p> <pre><code>public class MainActivity extends Activity { @SuppressLint("NewApi") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); LinearLayout fragContainer = (LinearLayout) findViewById(R.id.llFragmentContainer); LinearLayout ll = new LinearLayout(this); ll.setOrientation(LinearLayout.HORIZONTAL); ll.setId(12345); getFragmentManager().beginTransaction().add(ll.getId(), TestFragment.newInstance("I am frag 1"), "someTag1").commit(); getFragmentManager().beginTransaction().add(ll.getId(), TestFragment.newInstance("I am frag 2"), "someTag2").commit(); fragContainer.addView(ll); } } </code></pre> <p><strong>TestFragment.java:</strong></p> <pre><code>public class TestFragment extends Fragment { public static TestFragment newInstance(String text) { TestFragment f = new TestFragment(); Bundle b = new Bundle(); b.putString("text", text); f.setArguments(b); return f; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View v = inflater.inflate(R.layout.fragment, container, false); ((TextView) v.findViewById(R.id.tvFragText)).setText(getArguments().getString("text")); return v; } } </code></pre> <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:id="@+id/rlMain" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="5dp" tools:context=".MainActivity" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> <LinearLayout android:id="@+id/llFragmentContainer" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignLeft="@+id/textView1" android:layout_below="@+id/textView1" android:layout_marginTop="19dp" android:orientation="vertical" > </LinearLayout> </RelativeLayout> </code></pre> <p><strong>fragment.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="200dp" android:layout_height="200dp" > <TextView android:id="@+id/tvFragText" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:text="" /> </RelativeLayout> </code></pre> <p>And this is the result of the above code: (the two Fragments are aligned next to each other) <img src="https://i.stack.imgur.com/7kDaB.png" alt="result"></p>

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