title: NestedScrollView not scrolling when adding TextViews programmatically
body: <p>I'm including a chess board and pieces on one of the screens in my app, and I want to add a scrollable view underneath it to show the move notation when the user makes a move. I can add the text to the view, but no matter what I try, the view will not scroll.</p>
  
  <p>I've researched the trouble other users have had with this problem extensively. I've included fillViewport="true" and layout_height="wrap_content" but neither of those solutions is working for me. I've played around with the margins of the nestedscrollview to no avail, and I've been having this issue for the past couple days and still haven't figured out what I'm doing wrong.</p>
  
  <p>Here's the xml file:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"
      android:id="@+id/chessBoardScreen"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:clickable="true"
      android:focusable="true"
      app:layout_behavior="@string/appbar_scrolling_view_behavior"
      tools:context=".ChessBoardActivity"
      tools:showIn="@layout/app_bar_chess_board"&gt;
  
      &lt;android.support.constraint.ConstraintLayout
          android:id="@+id/cl_parent"
          android:layout_width="wrap_content"
          android:layout_height="350dp"
          app:layout_constraintBottom_toTopOf="@+id/move_view"
          app:layout_constraintEnd_toEndOf="parent"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintTop_toTopOf="parent"&gt;
  
          &lt;ImageView
              android:id="@+id/board"
              android:layout_width="wrap_content"
              android:layout_height="329dp"
              android:layout_marginTop="8dp"
              app:layout_constraintEnd_toEndOf="parent"
              app:layout_constraintStart_toStartOf="parent"
              app:layout_constraintTop_toTopOf="parent"
              app:srcCompat="@drawable/chess_board" /&gt;
  
          &lt;android.support.constraint.ConstraintLayout
              android:id="@+id/cl"
              android:layout_width="0dp"
              android:layout_height="0dp"
              app:layout_constraintBottom_toBottomOf="parent"
              app:layout_constraintEnd_toEndOf="parent"
              app:layout_constraintStart_toStartOf="parent"
              app:layout_constraintTop_toTopOf="parent"&gt;
  
          &lt;/android.support.constraint.ConstraintLayout&gt;
  
      &lt;/android.support.constraint.ConstraintLayout&gt;
  
      &lt;android.support.v4.widget.NestedScrollView
          android:id="@+id/move_view"
          android:layout_width="0dp"
          android:layout_height="0dp"
          android:fillViewport="true"
          app:layout_constraintBottom_toBottomOf="parent"
          app:layout_constraintEnd_toEndOf="parent"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintTop_toBottomOf="@+id/cl_parent"&gt;
  
          &lt;android.support.constraint.ConstraintLayout
              android:id="@+id/move_list"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"&gt;
  
          &lt;/android.support.constraint.ConstraintLayout&gt;
      &lt;/android.support.v4.widget.NestedScrollView&gt;
  
  &lt;/android.support.constraint.ConstraintLayout&gt;
  </code></pre>
  
  <p>And here's where I call the xml file in my application, this code is executed every time the user successfully makes a move on the chess board:</p>
  
  <pre><code>ConstraintLayout ml = findViewById(R.id.move_list);
          TextView tv = new TextView(ChessBoardActivity.this);
  
          float left = 34*density;
          float top;
          if(move == 'b') left += screenX/2.0;
          top = (-30+30*turns)*density;
  
          tv.setWidth((int)(screenX/2-34*density));
          tv.setHeight((int)(30*density));
          tv.setTranslationX(left);
          tv.setTranslationY(top);
          tv.setText(moveString);
          ml.addView(tv);
  </code></pre>
  
  <p>Any help figuring out this problem would be appreciated! Thank you :)</p>
  
  <p>I expect the nestedscrollview to be scrollable when the textviews draw beyond the screen but within the limits of the view, but it's not scrolling at all.</p>