Ripple improvements

app/src/main/java/com/hippo/util/DrawableManager.java

@@ -19,7 +19,6 @@ package com.hippo.util;
 import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.drawable.Drawable;
-import android.os.Build;
 
 import androidx.annotation.DrawableRes;
 import androidx.annotation.NonNull;