Android - Can't create simple rectangle shape... UnsupportedOperationException?

Question

Hello, I'm having trouble creating a simple rounded rectangle using XML. Every time I try to add the "corners" element to the custom shape I get:

java.lang.UnsupportedOperationException at android.graphics.Path.addRoundRect(Path.java:514) at android.graphics.drawable.GradientDrawable.draw(GradientDrawable.java:314) at android.view.View.draw(View.java:6520) ...

res/dawable/rounded_rectangle.xml:

<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> 
    <solid android:color="#ffffff"/>    

    <stroke android:width="3dp"
            android:color="#ff000000"/>

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

    <corners android:bottomRightRadius="7dp" android:bottomLeftRadius="7dp" 
     android:topLeftRadius="7dp" android:topRightRadius="7dp"/> 
</shape>

simple layout.xml using the above shape:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="fill_parent" 
    android:layout_width="fill_parent">

<View android:id="@+id/View01" 
    android:background="@drawable/rounded_rectangle" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent">
</View>
</RelativeLayout>

Fyi, I'm trying to compile for Android 2.1 and I have all the latest updates installed to Eclipse and the Android SDK. This shape is a direct copy of something I saw on another website, but for some reason It doesn't want to work for me.

Thanks.

Answer 1

So, I was just playing around with this a bit and I changed a couple of lines in the rounded_rectangle.xml to get it working. See below:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> 
    <solid android:color="#ffffff"/>    

    <stroke android:width="3dp"
            android:color="#ff000000"/>

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

    <corners android:radius="30px"/> 
</shape>

I only wish Google would put out a proper reference doc for creating XML-based shapes. After hours (4+) of hunting down examples on the Web, I feel like it's still a guessing game as to what elements/attributes are supported in these types of XML documents. Sorry for the mini-rant.

I hope this helps someone else.

Answer 2

Not that it's that much help, but you can see the attributes (and documentation) in R.attrs:

http://developer.android.com/reference/android/R.attr.html#shape

However, you would need to know the name first....

Answer 3

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HI.. How to draw a thin line using in layout xml ??? and how to create a line background for the same kind of using drawable xml???

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Answer 4

See Shape element and its attributes here: http://developer.android.com/guide/topics/resources/drawable-resource.html#Shape