java - Android XML preview does not show the different contents -



have 2 framelayouts fragment container.
problem xml previewer shows nothing.
app works , there no error message.
tried add tools:showin="@layout/..." in different framelayouts did not work.

<scrollview     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/main"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context="com.sarahpoehler.testapp.mainactivity">      <linearlayout         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:orientation="vertical">          <framelayout             android:id="@+id/container_fragment_one"             android:layout_width="wrap_content"             android:layout_height="wrap_content"/>          <framelayout             android:id="@+id/container_fragment_two             android:layout_width="wrap_content"             android:layout_height="wrap_content"/>     </linearlayout> </scrollview>

here xml preview"


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