listview1.setSelector(android.R.color.transparent);
//You can change the color & radius too.
//1.create gradient
android.graphics.drawable.GradientDrawable style = new android.graphics.drawable.GradientDrawable();
//2.set the gradient color & radius
style.setColor(Color.parseColor("#B3E5FC"));
style.setCornerRadius(17);
//.set listview1 selector to it
listview1.setSelector(style);
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