从另一个活动返回时未绘制 LinearLayout 的子项

Question

在应用启动时，LinearLayout (LL) 的所有子级都会被渲染。 但是，当来自另一个活动时，使用相同的代码，LL 的子项不可见，但仍包含在视图树中。 看：

activity_main.xml是：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent">

<LinearLayout
    android:id="@+id/notes"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_centerInParent="true"
    android:layout_alignParentTop="true"
    android:orientation="vertical"
    android:background="@color/accent"> <!-- BG Color to quickly see if it is drawn -->

    <!-- LinearLayout is removed or created in NoteRenderer#all-->
</LinearLayout>
</RelativeLayout>

至少在应用程序启动孩子的代码是

    public void all(ArrayList<Note> notes) {
    LinearLayout linearLayout = main.findViewById(R.id.notes);
    linearLayout.setBackgroundColor(main.getColor(R.color.accent));
    linearLayout.setVisibility(View.VISIBLE);

    for (int i = 0; !noneFound && i < notes.size(); i++) {
        LayoutInflater.from(main).inflate(R.layout.note, linearLayout, true);
        links.add(new NoteViewLink(notes.get(i), (RelativeLayout) linearLayout.getChildAt(linearLayout.getChildCount() - 1), i));
    }

    // This is what I have already tried
    //        linearLayout.setVisibility(View.VISIBLE);
    //        linearLayout.setVisibility(View.GONE);
    //        linearLayout.setVisibility(View.VISIBLE);
    //        linearLayout.invalidate();
    //        linearLayout.refreshDrawableState();
    //        linearLayout.requestLayout();
    //        linearLayout.forceLayout();
  }

在 class 渲染上面的布局我只是这样做：

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

我知道孩子们在视图树中，因为我以 LL 作为起点的调试方法打印了孩子们，这些孩子们是正确的：

D: |— 1/8 RelativeLayout 2131296449
D:   |— 1/4 MaterialCheckBox 2131296332
D:   |— 2/4 MaterialTextView 2131296548
D:   |— 3/4 MaterialTextView 2131296532
D:   |— 4/4 AppCompatImageButton 2131296463
D: |— 2/8 RelativeLayout 2131296449
D:   |— 1/4 MaterialCheckBox 2131296332
D:   |— 2/4 MaterialTextView 2131296548
D:   |— 3/4 MaterialTextView 2131296532
D:   |— 4/4 AppCompatImageButton 2131296463
D: |— 3/8 RelativeLayout 2131296449
D:   |— 1/4 MaterialCheckBox 2131296332
D:   |— 2/4 MaterialTextView 2131296548
D:   |— 3/4 MaterialTextView 2131296532
D:   |— 4/4 AppCompatImageButton 2131296463
D: |— 4/8 RelativeLayout 2131296449
D:   |— 1/4 MaterialCheckBox 2131296332
D:   |— 2/4 MaterialTextView 2131296548
D:   |— 3/4 MaterialTextView 2131296532
D:   |— 4/4 AppCompatImageButton 2131296463
D: |— 5/8 RelativeLayout 2131296449
D:   |— 1/4 MaterialCheckBox 2131296332
D:   |— 2/4 MaterialTextView 2131296548
D:   |— 3/4 MaterialTextView 2131296532
D:   |— 4/4 AppCompatImageButton 2131296463
D: |— 6/8 RelativeLayout 2131296449
D:   |— 1/4 MaterialCheckBox 2131296332
D:   |— 2/4 MaterialTextView 2131296548
D:   |— 3/4 MaterialTextView 2131296532
D:   |— 4/4 AppCompatImageButton 2131296463
D: |— 7/8 RelativeLayout 2131296449
D:   |— 1/4 MaterialCheckBox 2131296332
D:   |— 2/4 MaterialTextView 2131296548
D:   |— 3/4 MaterialTextView 2131296532
D:   |— 4/4 AppCompatImageButton 2131296463
D: |— 8/8 RelativeLayout 2131296449
D:   |— 1/4 MaterialCheckBox 2131296332
D:   |— 2/4 MaterialTextView 2131296548
D:   |— 3/4 MaterialTextView 2131296532
D:   |— 4/4 AppCompatImageButton 2131296463

我对任何建议或提示都很满意，首先我在 ScrollView 中有 LL，但后来 LL 没有被绘制出来……也许是渲染线程的问题？