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<?xml version="1.0" encoding="utf-8"?>
    <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/constraint1”
      android:layout_width="match_parent"
        android:layout_height="wrap_content"
     android:paddingBottom="@dimen/dimen_5"
        xmlns:app="http://schemas.android.com/apk/res-auto">
    <TextView
    android:id="@+id/textview1”
            android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_marginTop="12dp"
        android:layout_marginStart="8dp"
        android:maxLines="1"
        android:textSize="@dimen/ms_text_size"
        android:visibility="visible"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
    <LinearLayout
    android:id="@+id/linearlayout1”
        app:layout_constraintTop_toBottomOf="@+id/textview1"
        app:layout_constraintStart_toStartOf="parent"
        android:orientation="vertical"
        android:layout_marginBottom="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        </LinearLayout>
        </androidx.constraintlayout.widget.ConstraintLayout>
Now in this xml for linearLayout i need to include another layout merge.xml dynamically.
<?xml version="1.0" encoding="utf-8"?>
        <merge xmlns:android="http://schemas.android.com/apk/res/android"
            <TextView
                android:id="@+id/text1”
                android:textStyle="bold"
                android:textSize="@dimen/txt_size_14"
                android:paddingStart="@dimen/dimen_14dp"
                android:paddingEnd="@dimen/dimen_14dp"
                android:textColor="@color/grey"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>
            <TextView
                android:id="@+id/text2”
                android:paddingStart="@dimen/dimen_14dp"
                android:paddingEnd="@dimen/dimen_14dp"
                android:layout_marginTop="@dimen/dimen_2"
                android:textSize="@dimen/txt_size_17"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>
        </merge>
Code :
LinearLayout linearLayout = rootView.findViewById(R.id.linearLayout1);
View view = layoutInflater.inflate(R.layout.merge, null, false );
linearLayout.addView(view);
It is giving error.
  
android.view.InflateException: Binary XML file line #2:  can
  be used only with a valid ViewGroup root and attachToRoot=true
                You can make a Fragment then include this fragment to a 'container' in your first Layout. (Container = LinearLayour/FameLayout...)
– Aspicas
                Jan 24, 2020 at 13:28
Your error explains what you have to do. Replace this (both lines):
 View view = layoutInflater.inflate(R.layout.merge, null, false); 
 linearLayout.addView(view);
with this (one line):
layoutInflater.inflate(R.layout.merge, linearLayout, true);
So layoutInflater can properly resolve layout parameters.
                java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
– stack Learner
                Jan 24, 2020 at 13:36
                have you removed the second line (addView)? because in this case layoutinflater already adds it to the layout by specifying last argument as true.
– Pawel
                Jan 24, 2020 at 13:38
                yes removing addView Worked .But if i need to include this layout for 3 times it is only taking the third value.
– stack Learner
                Jan 24, 2020 at 13:52
<merge> is not something you use programmatically because it's not a View. 
It's a compile-time attribute to indicate to merge the given layouts into any other layout that includes them.
Merge documentation: https://developer.android.com/training/improving-layouts/reusing-layouts.html#Merge
                does that mean to include a layout programatically i need to give somae parent in merge.xml.
– stack Learner
                Jan 24, 2020 at 13:36
                This is not correct, you can add a layout with merge programmatically as the Pawel answer explain
– cutiko
                Jan 24, 2020 at 13:45
                @cutiko i was able to add with pawel answer but if i need to add it thrice it is only adding only the last value.
– stack Learner
                Jan 24, 2020 at 14:21
try this -->
LayoutInflater vi = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
 View v = vi.inflate(R.layout.your_layout, null);
// fill in any details dynamically here
TextView textView = (TextView) v.findViewById(R.id.a_text_view);
textView.setText("your text");
// insert into main view
ViewGroup insertPoint = (ViewGroup) findViewById(R.id.insert_point);
insertPoint.addView(v, 0, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));
        
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