Views are not visible after addView

Question

This is the dynamically created view:

<ScrollView 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">

    <LinearLayout
        android:id="@+id/linearlayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:background="@color/colorPrimary"
        android:minHeight="50dp">
    </LinearLayout>
</ScrollView>

I add views to LinearLayout above with codes similar to following :

 View view = inflater.inflate(R.layout.somelayout, rootView, false);
 AppCompatTextView textView = (AppCompatTextView) view.findViewById(R.id.text);
 textView.setText("Text");
 AppCompatTextView textView2 = (AppCompatTextView) view.findViewById(R.id.text2);
 textView2.setText("Text");
 view.setLayoutParams(vp);
 rootView.addView(view);

vp is the following:

LinearLayout.LayoutParams vp =
    new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
        LinearLayout.LayoutParams.WRAP_CONTENT);

In some cases views are added but not visible.Even i can scroll the layout. Initial state of the container layout is invisible. I add views and then set visibility to VISIBLE when clicked a tab. When i change the orientation, they become visible. When they are not visible, i checked with hierarchy viewer and saw that child views measurements are 0. I call requestlayout and also invalidate, but doesnt work. How can i force to measure child views?