Why i am not able to create the round border for specific corner?

问题

In My android xml layout i am applying the border by using the borderframe.xml as a background.

borderframe.xml file is looks like below:

    <?xml version="1.0" encoding="UTF-8"?>
<shape 
    xmlns:android="http://schemas.android.com/apk/res/android">
    <stroke 
        android:width="1dip" 
        android:color="#ffffff"/>
    <solid 
        android:color="#95865F"/>
    <corners 
        android:radius="10px"/>

    <padding 
        android:left="1dp"
        android:right="1dp"
        android:top="1dp"
        android:bottom="1dp"/> 
</shape>

Now, While there is a android:radius="10px" then it is works but while i am going to give round shape to specific corner only then it not works. There is no any erro message in log cat but i found error in eclipse like:

    The graphics preview in the layout editor may not be accurate:
* Different corner sizes are not supported in Path.addRoundRect.

Even if there is no padding in that xml file then also i am not able to see any border.

Now, what should i have to do for it ? and whats the sollution of it if i want to create the rounded border for only topLeftcorner and bottomLeftCorner. ? Thanks.

回答1:

You'll have to do that, assuming you only want a rounded top left corner:

<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle">
  <corners
      android:radius="20sp"
      android:topRightRadius="0dp"
      android:bottomRightRadius="0dp"
      android:bottomLeftRadius="0dp" />
  <gradient
      android:startColor="@color/logo_blue"
      android:endColor="@color/blue"
      android:angle="0"/>
</shape>

Explanation: Every corner must (initially) be provided a corner radius greater than 1, or else no corners are rounded. If you want specific corners to not be rounded, a work-around is to use android:radius to set a default corner radius greater than 1, but then override each and every corner with the values you really want, providing zero ("0dp") where you don't want rounded corners. ^[source]

As a consequence, you need to define your drawable as:

<?xml version="1.0" encoding="UTF-8"?>
<shape 
    xmlns:android="http://schemas.android.com/apk/res/android">
    <stroke 
        android:width="1dip" 
        android:color="#ffffff"/>
    <solid 
        android:color="#95865F"/>
    <corners 
       android:radius="10px"
      android:topRightRadius="0dp"
      android:bottomRightRadius="0dp" />

    <padding 
        android:left="1dp"
        android:right="1dp"
        android:top="1dp"
        android:bottom="1dp"/> 
</shape>

Update

From The Shape Drawable Resource Android Documentation:

android:radius Dimension. The radius for all corners, as a dimension value or dimension resource. This is overridden for each corner by the following attributes.

overridden is the keyword for your problem…

回答2:

I am also facing the same problem. But for that I use layer-list. I post my answer here which may help you.
Please check output screen

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item>
      <shape 
        android:shape="rectangle">
            <stroke android:width="1dp" android:color="#c1c1c1" />
            <solid android:color="#c1c1c1" />
            <corners android:radius="20dp"/>
        </shape>
   </item>

   <item android:right="20dp"
        >
      <shape 
        android:shape="rectangle">
            <stroke android:width="1dp" android:color="#c1c1c1" />
            <solid android:color="#c1c1c1" />
        </shape>
   </item>

</layer-list>

回答3:

I'm using SDK tools 19, platform-tools 11 and running the app in Android 4.0.3. Using the following XML works for me:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" 
    android:shape="rectangle">
    <solid android:color="#dd000000"/>
    <padding 
        android:left="7dp"
        android:top="7dp"
        android:right="7dp"
        android:bottom="7dp" />
    <corners
        android:bottomLeftRadius="25dp"
        android:bottomRightRadius="25dp"
        android:topLeftRadius="0dp"
        android:topRightRadius="0dp" />
</shape>

The Eclipse warning is about not being able to show the preview. In het app it shows up correct.

回答4:

I got the solution on one of the forums. I solved it by commenting each corner & adding to the xml in drawable. I have retained commented code below only for understanding.

XML Code-

   <?xml version="1.0" encoding="utf-8"?>
    <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
        <solid android:color="#fd2149" />
        <stroke android:width="1dip" android:color="#ffd102"/>
      <!--  <corners
            android:bottomLeftRadius="8dp"
            android:bottomRightRadius="8dp"
            android:topLeftRadius="8dp"
            android:topRightRadius="8dp" />
        -->
        <corners android:radius="8dp" />
    </shape>

---Edited- The above code is my back.xml in drawable folder and if required you can add padding to the same back.xml. For those who are new developers, the back.xml is referenced from your layout file as follows

  <TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/tableLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:textSize="20sp"
    android:scrollbars="vertical"
    android:background="@drawable/back">

Hope this helps.

来源：https://stackoverflow.com/questions/8399517/why-i-am-not-able-to-create-the-round-border-for-specific-corner

标签

android

xml-layout