Android: How to create icons for all Resolution (LDPI,MDPI etc)

The General formula is :

LDPI = MDPI X 0.75
MDPI = MDPI
TVDPI = MDPI X 1.33
HDPI = MDPI X 1.5
XHDPI = MDPI X 2
XXHDPI = MDPI X 3
XXXHDPI = MDPI X4

instead of make all version we can make the larger one and by using image resizer software we can resize the image or icon for al resolution :

Download From Here :
You can download from here ,and its very easy to use just drag n drop your image and define the resolution by drop down ,it will automatically create folders in the same location where the current file is located .
LINK

and then