此Horizo​​ntalScrollView布局或其LinearLayout父级是无用的

问题描述

我是android编程的新手，horizo​​ntalscrollview有问题.我在错误此Horizo​​ntalScrollView布局或其LinearLayout父级无用"上

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

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical">


    <HorizontalScrollView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="50dp"
        >

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:background="@drawable/bgtest">

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Button1" />

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Button2" />

        </LinearLayout>
    </HorizontalScrollView>

</LinearLayout>

推荐答案

首先，这不是错误，而是警告-代码仍然可以正常工作.

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

现在，如您所见，您已经拥有:

Now, as you can see, you have:

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

    </HorizontalScrollView ...>
</LinearLayout>

LinearLayout中只有一个孩子-另一个ViewGroup-因此您可以摆脱外部LinearLayout并只需保留HorizontalScrollView:

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>

但是，如果您要在代码中的LinearLayout中添加任何视图(即作为HorizontalScrollView的同级对象)，则正确的做法是忽略此警告.

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.

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