How to get gravity 'bottom' working on a drawable in xml

问题

I have a simple aim. I want a light grey background on my FrameLayout with a black dividing line underneath it (only undernearth, not all around). So far I have this:

<?xml version="1.0" encoding="utf-8"?>
   <layer-list xmlns:android="http://schemas.android.com/apk/res/android"> 
   <item>
    <shape android:shape="rectangle" android:gravity="center">
        <solid android:color="#EEEEEE" />   
    </shape>
   </item>
   <item>
   <shape android:shape="line" android:gravity="bottom" >
       <stroke android:width="1dip" android:color="#010101"/>
   </shape>
   </item>
   </layer-list>

But it draws the line through the centre, i.e. ignores the gravity='bottom' bit. How can I fix this?

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回答1:

I'd recommend using a nine-patch image for this - here's an example that should do the job:

(It's only tiny but it is there!)

If you place this in your drawable folder and set your FrameLayout's background to it then you should get the desired result. The content will go in the grey area and the #010101 pixel will be stretched horizontally to form a line at the bottom. Just make sure to keep the .9.png extension to ensure it gets loaded as a nine-patch.

Hope that helps you

回答2:

I've struggled a lot with this as well. Basically, to create a border at the bottom, you have to think in opposite direction from what you expect. You start with a rectangle with your Border color. On top of that, you draw the actual color, with an offset from the bottom. I use this:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <!-- CREATE A RECTANGLE WITH YOUR BORDER COLOR -->
    <item>
        <shape android:shape="rectangle" >
            <solid android:color="#fff"/>
        </shape>
    </item>

    <!-- NOW DEFINE THE NORMAL COLOR-->
    <item android:bottom="BOTTOM_BORDER_THICKNESS E.G. 4dp">
        <shape android:shape="rectangle" >
            <solid android:color="#ccc"/>
        </shape>
    </item>
</layer-list>

Or, as Juan Pablo Saraceno suggested :

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" > 
    <item> 
        <color android:color="YOUR_BORDER_COLOR" /> 
    </item> 
    <item android:top="YOUR_BORDER_THICKNESS"> 
        <color android:color="YOUR_BG_COLOR" /> 
    </item> 
</layer-list>

回答3:

Unfortunately I have not found a way to get the gravity working for drawables, but I found how you can achieve what you want with pure xml:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:top="-2dp"
        android:left="-2dp"
        android:right="0dp"
        android:bottom="1dp"
        >
        <shape android:shape="rectangle">
            <solid android:color="#EEEEEE"/>
            <stroke android:width="1dp" android:color="#010101"/>
        </shape>
    </item>
</layer-list>

Good luck:)

回答4:

This works!

<item>
      <bitmap
         android:gravity="left|bottom"
         android:src="@drawable/myDrawable" />
 </item>

回答5:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <item>
        <shape android:shape="rectangle" >
            <solid android:color="@color/Black" />
        </shape>
    </item>
    <item android:bottom="5dp">
        <shape android:shape="rectangle" >
            <solid android:color="@color/White" />
        </shape>
    </item>

</layer-list>

回答6:

Well, it's pretty old question, but none of the answers seem to answer the actual question (how to make gravity working) so here's a working example:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item>
        <color android:color="#2196F3"/>        <!-- Background color -->
    </item>

    <item android:gravity="bottom">
        <shape>
            <size android:height="10dp" />      <!-- I would suggest 1dp -->
            <solid android:color="#F50057" />   <!-- Line color -->
        </shape>
    </item>
</layer-list>

By analogy, if you want to use gravity left or right change attribute height to width

回答7:

I know it's pretty old question but given answers didn't work for me. Turns out in order to gravity property work you just need to add size tag in drawable item.

So following will work as expected:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:gravity="center">
        <shape android:shape="rectangle">
            <solid android:color="#EEEEEE" />
        </shape>
    </item>
    <item
        android:gravity="bottom">
        <shape android:shape="line">
            <size android:height="2dp"/>
            <stroke android:width="1dip" android:color="#010101"/>
        </shape>
    </item>
</layer-list>

ps. this feature added in api level 23 https://developer.android.com/reference/android/graphics/drawable/LayerDrawable#setLayerGravity%28int,%20int%29

来源：https://stackoverflow.com/questions/8836901/how-to-get-gravity-bottom-working-on-a-drawable-in-xml

标签

android

xml

drawable