This HorizontalScrollView layout or its LinearLayout parent is useless

Question

I am new in android programming I have problem with horizontalscrollview. I have error \"This HorizontalScrollView layout or its LinearLayout parent is useless\" on

Answer 1

First of all, this is not an error but a warning - the code will still work correctly.

Now, as you can see, you have:

<LinearLayout ...>
    <HorizontalScrollView ...>

    </HorizontalScrollView ...>
</LinearLayout>

There is only one child in the LinearLayout - and it's another ViewGroup - therefore you can get rid of the outer LinearLayout and simply keep the HorizontalScrollView:

<?xml version="1.0" encoding="utf-8"?>
<HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="lv.myproject.formula.MainFormula"
    tools:ignore="MergeRootFrame"
    android:layout_marginTop="50dp" >

    ...
</HorizontalScrollView>

However if you are adding any Views to the LinearLayout in your code (i.e. as siblings to your HorizontalScrollView) then the correct thing is to ignore this warning.