BaiDuAutoUpdateDemo/BDIntegrationSDK_LibProject/res/drawable/bdp_update_bg_dialog_content.xml

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

    <item>
        <shape>
            <corners android:bottomLeftRadius="3dip" android:bottomRightRadius="3dip" android:topRightRadius="0dip" android:topLeftRadius="0dip" />

            <solid android:color="#ffffffff" />

            <padding android:bottom="0dip" android:left="0dip" android:right="0dip" android:top="0dip" />
        </shape>
    </item>

</selector>