I have Designed Android App in photoshop.
but developer is asking for mdpi, hdpi, xhdpi, xxhdpi, xxxhdpi Slicing.
My Dimensions for app is 1080x1920 (WxH).
I am totally confused with slicing, DP and pixels.
This isn't something I do myself - but a quick search found this. I am not necessarily recommending this as I haven't used it but it is a free (I believe) script that will export assets with all of the settings you mention.
There is also a short explanation on the page as well.