Why shouldn't I set layout_width and layout_height in a style?

问题

If I have a lot of TextViews serving as item labels, I thought I could extract everything that's common about them into a style, and in the layout use only

<TextView style="@style/label" android:text="Foo"/>
<TextView style="@style/label" android:text="Bar"/>

with style like:

<style name="label">
    <item name="android:layout_width">wrap_content</item>
    <item name="android:layout_height">wrap_content</item>
</style>

But when I do this, it works fine on emulator and device, but the Android XML editor complains that "<TextView>" does not set the required layout_height attribute. Is there some reason on why it is reporting this warning?

回答1:

Have you tried to clean the project?

I am using also the same thing on some XML files for the width and the length. Here is an example working on my app, you can have a look:

<TextView
    android:id="@+id/viewdescription"
    android:textIsSelectable="true"
    android:layout_below="@+id/rating_bar_view"
    android:minLines="8"
    style="@style/description" />

And the XML:

<style name="description">
   <item name="android:layout_gravity">center_horizontal</item>
   <item name="android:inputType">textMultiLine</item>
   <item name="android:layout_width">fill_parent</item>
   <item name="android:layout_height">wrap_content</item>     
   <item name="android:textSize">14sp</item>
   <item name="android:textColor">@color/Black</item>
   <item name="android:layout_marginRight">8dp</item>
   <item name="android:layout_marginLeft">8dp</item>

回答2:

After a Build > Clean Project attempt, I was still experiencing this same issue in the layout editor; a full restart of my IDE solved the problem for me.

回答3:

Old topic but still :)

I don't think setting a width and height to style is a good idea. Basically it compiles and usually works but I experienced situations with more complex layouts, includes etc. where it was causing problems. And when you think about it, it doesn't really make sense to put it there.

You can easily use @dimen if you want different values for different layouts. And it can also be pretty surprising for somebody else using your style. You usually want to set color, size, and behavior with style but size is not one of the things.

You never know in what context your style gonna be used in. It's just one of these smelly things which when you see you start to have a feeling that something could have been done better.

回答4:

I have tried this, its just working fine..

 <EditText
        android:id="@+id/edt_mobile_no"
        style="@style/login_input_fields"
        android:hint="@string/hint_mobile"
        android:inputType="phone" />

Here below the style for the EditText

<style name="login_input_fields">
    <item name="android:layout_width">match_parent</item>
    <item name="android:layout_height">40dp</item>
    <item name="android:layout_marginBottom">10dp</item>
    <item name="android:background">@drawable/bg_curved_white_border</item>
    <item name="android:paddingRight">10dp</item>
    <item name="android:paddingLeft">10dp</item>
    <item name="android:textColor">@android:color/white</item>
    <item name="android:textColorHint">@color/underline</item>
    <item name="android:textSize">16sp</item>
    <item name="android:typeface">monospace</item>
</style>

回答5:

I thing you should put the parent of label as "@android:style/Widget.TextView"

来源：https://stackoverflow.com/questions/16497758/why-shouldnt-i-set-layout-width-and-layout-height-in-a-style