Progress bar with rounded corners?

How to make the progress shape a bit smaller?

You need to give the progress item a little padding, like so:

<item android:id="@android:id/progress"    android:top="2dp"    android:bottom="2dp"    android:left="2dp"    android:right="2dp">

How to make the progress bar to be curved as per design?

Replace the <clip></clip> element, with <scale android:scaleWidth="100%"></scale>. That will make the shape keep its form as it grows - and not cut off.Unfortunately, it will have a little unwanted visual effect at the beginning - as the shape corners don't have enough space to draw. But it might be good enough for most cases.

Full code:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@android:id/background">    <shape>        <corners android:radius="8dp"/>        <solid android:color="@color/dirtyWhite"/>    </shape> </item> <item android:id="@android:id/progress"    android:top="1dp"    android:bottom="1dp"    android:left="1dp"    android:right="1dp">    <scale android:scaleWidth="100%">        <shape>            <corners android:radius="8dp"/>            <solid android:color="@color/colorPrimaryDark"/>        </shape>    </scale> </item></layer-list>

With the Material Components Library you can use the LinearProgressIndicator and the app:trackCornerRadius attribute.
Something like:

    <com.google.android.material.progressindicator.LinearProgressIndicator        android:indeterminate="true"        app:trackThickness="xxdp"        app:trackCornerRadius="xdp"/>

It works also for the determinate progress indicator removing the android:indeterminate="true" or using android:indeterminate="false"

Note: it requires at least the version 1.3.0.

Thanks to Georgi Koemdzhiev for a nice question and images. For those who want to make similar to his, do the following.

1) Create a background for a ProgressBar.

progress_bar_background.xml:

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="rectangle"    >    <corners android:radius="3dp" />    <stroke android:color="@color/white" android:width="1dp" /></shape>

2) Create a scale for the ProgressBar.

curved_progress_bar.xml:

<?xml version="1.0" encoding="utf-8"?><layer-list xmlns:android="http://schemas.android.com/apk/res/android">    <item android:id="@android:id/background">        <shape>            <corners android:radius="2dp" />            <solid android:color="@color/transparent" />        </shape>    </item>    <item android:id="@android:id/progress">        <clip>            <shape>                <corners android:radius="2dp" />                <solid android:color="#ffff00" />            </shape>        </clip>    </item></layer-list>

3) In layout file add the ProgressBar.

<FrameLayout    android:layout_width="match_parent"    android:layout_height="6dp"    android:layout_marginStart="20dp"    android:layout_marginTop="10dp"    android:layout_marginEnd="20dp"    android:background="@drawable/progress_bar_background"    >    <ProgressBar        android:id="@+id/progress_bar"        style="@style/Widget.AppCompat.ProgressBar.Horizontal"        android:layout_width="match_parent"        android:layout_height="4dp"        android:layout_margin="1dp"        android:indeterminate="false"        android:progressDrawable="@drawable/curved_progress_bar"        /></FrameLayout>