Solved. My question may not be clear, causing someone to misunderstand it. The current requirements are:

The progress part of progress needs to have rounded corners on both sides

I tried using shape from the beginning, but it didn’t work
I copied the answer on the first floor and tried it, and the effect was the same as my initial result

If you use the .9 picture, you can avoid this problem, just put the question:

<!-- 进度条 -->
    <item android:id="@android:id/progress" android:drawable="@drawable/live_channel_progress"/>

Just change this part:

<!-- 进度条 -->
    <item android:id="@android:id/progress">
         <scale android:scaleWidth="100%"
               android:drawable="@drawable/live_channel_progress" />
    </item>

This is because the Progressbar will clip when drawing. If you specify the clip attribute, the right side will definitely be cut into a right angle, so you need to use scale in the item. It will be perfect with the .9 picture.

http://stackoverflow.com/questions/2078809/progress-bar-rounded-on-both-sides-in-android

   <ProgressBar
          android:id="@+id/progressBar"
          android:layout_width="160dp"
          android:layout_height="7dp"
          style="@style/ProgressBar_Validity"
      />

style:

   <style name="ProgressBar_Validity" parent="@android:style/Widget.ProgressBar.Horizontal">
        <item name="android:indeterminateOnly">false</item>
        <item name="android:indeterminateDrawable">@android:drawable/progress_indeterminate_horizontal</item>
        <item name="android:progressDrawable">@drawable/progress_validity</item>
    </style>

progress_validity:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <item android:id="@android:id/secondaryProgress">

        <clip >
            <shape >
                <corners android:radius="6dip" />
                <solid android:color="#EAEAEA"/>
            </shape>
        </clip>
    </item>

    <item android:id="@android:id/progress">
        <clip >
            <shape >
                <corners android:radius="6dip" />
                <solid android:color="#03A9F4"/>
            </shape>

        </clip>
    </item>
</layer-list> 

There is a problem with the formatting. Please sort it out yourself. . Correct by personal test.