Progress bar rounded on both sides in android

Just change the label <clip> to <scale> like this:

<scale android:scaleWidth="100%">

Here's an updated answer for the times:

The Android source code uses Patch 9 files to achieve the effect: http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/4.4_r1/frameworks/base/core/res/res/drawable/progress_horizontal_holo_dark.xml/

So start in your layout xml:

<ProgressBar
    android:id="@+id/custom_progress_bar"
    style="@android:style/Widget.ProgressBar.Horizontal"
    android:indeterminateOnly="false"
    android:progressDrawable="@drawable/custom_progress_bar_horizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:minHeight="13"
    android:progress="33"
    android:secondaryProgress="66" />

You can move a lot of this to a style xml but that's beside the point. What we really care about is android:progressDrawable="@drawable/custom_progress_bar_horizontal" - which is going to allow us to specify our own custom progress bars:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/background"
          android:drawable="@android:drawable/custom_progress_bg" />
    <item android:id="@android:id/secondaryProgress">
        <scale android:scaleWidth="100%"
               android:drawable="@android:drawable/custom_progress_secondary" />
    </item>
    <item android:id="@android:id/progress">
        <scale android:scaleWidth="100%"
               android:drawable="@android:drawable/custom_progress_primary" />
    </item>
</layer-list>

Or you don't have to use a Patch 9 for your background- for example here's a simple white background with a 1dp border:

<item android:id="@android:id/background">
    <shape>
        <corners android:radius="6.5dp" />

        <solid android:color="@android:color/white" />

        <stroke
            android:width="1dp"
            android:color="@android:color/darker_gray" />
    </shape>
</item>

Android Asset Studio has an awesome tool to help you generate Patch 9 files: http://android-ui-utils.googlecode.com/hg/asset-studio/dist/nine-patches.html

Example primary xdpi png with padding before the tool:
Example secondary xdpi png with padding before the tool:

And the final output:

As far as I know, this is not possible. Because internally ClipDrawable (i.e. clip tag) cuts the given shape/drawable using canvas.clipRect(). Btw, you can copy the ClipDrawable source from here and clip a particular path based on the progress level.