How to apply glow effect?

I am trying to create this type of horizontal ProgressBar but no idea about the glowing effect for as starting point of progress.

enter image description here

Here is my code for gradient color

<?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="0dip" />

        <solid android:color="#ff9d9e9d"/>
        </shape>
    </item>
    <item android:id="@android:id/secondaryProgress">
        <clip>
            <shape>
                <corners android:radius="5dip" />

            <gradient
                    android:angle="180"
                    android:startColor="#8872f8fc"
                    android:endColor="#886dc0e3" />
            </shape>
        </clip>
    </item>
    <item android:id="@android:id/progress">
        <clip>
            <shape>
                <corners android:radius="5dip" />

                <gradient
                    android:angle="180"
                    android:startColor="#31c6f7"
                    android:centerColor="#2ea6d1"
                    android:endColor="#2884a6" />
            </shape>
        </clip>
    </item>

</layer-list>
android styles progress-bar
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