Installing fonts for Android mobile phones is not so difficult. The easiest way to do this is to download the font to your SD card (does not matter the directory) then (using a compatible application which is able to navigate through folders) copy the font to the /system/fonts folder and perform reboot of the device. Then you can use the font and select it from: Menu > Display > Font Style > Marathi.
Please note that copy operations performed over the file system require administrative rights such as root.
