Change ActionToolbar Android to be transparent

background_transparent.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="@android:color/transparent" />
</shape>

ToolbarUtil.java

public static void transparentBackgroundToolbarsIcon(Toolbar toolbarView) {
        for (int i = 0; i < toolbarView.getChildCount(); i++) {
            final View v = toolbarView.getChildAt(i);

            if (v != null && v instanceof TextView) {
                TextView t = (TextView) v;
                t.setBackgroundResource(R.drawable.background_transparent);

            }

            if (v instanceof ActionMenuView) {
                v.setBackgroundResource(R.drawable.background_transparent);
            }
        }
        toolbarView.setBackgroundResource(R.drawable.background_transparent);
        toolbarView.invalidate();
    }