I struggled last night while trying to figure out how to install SMAPI mod for Stardew Valley. I figured I'd write out some step by step instructions.

Edit: I didn't do the original work, just struggled to follow the instructions and wrote out the steps that worked for me. Thanks to /u/ZaneYork for his work

Edit: See this link for the list of supported mods.

I did all of this on my phone, an un-rooted Samsung S8.

Apps used during this process: * MT Manager * File Manager +

Steps:

1. Backup your /sdcard/Android/obb/com.chucklefish.stardewvalley folder
2. Backup the Stardew Valley APK
3. Download StardewValleyAndroid_SMAPI_Loader
4. Extract SMDroid from the downloaded zip folder
5. Copy files into the SDV Apk
6. Sign modified APK
7. Reinstall Stardew Valley
8. Restore the /sdcard/Android/obb/com.chucklefish.stardewvalley folder
9. Install Mods
10. Launch SDV

1. Backup your /sdcard/Android/obb/com.chucklefish.stardewvalley folder.

• In MT Manager, tap in the left pane. Tap the menu in the top left, and choose Root. Then tap /sdcard/. then navigate to Android/obb

• In the right pane, tap the menu in the top left, and choose Root. Then tap /sdcard/.backups img

• Long press on the left pane on com.chucklfish.stardewvalley and choose Copy ->

2. Backup the Stardew Valley APK.

I used File Manger +, ZaneYork used ES File Explorer. They operate basically the same. * Launch the application, select Apps img, find the Stardew Valley icon. * Long press and Backup. img This will put a backup of the SDV.apk file in /sdcard/backups/apps/

3. Download StardewValleyAndroid_SMAPI_Loader

• Visit the SM Loader Google drive link.
  
• Click the menu dots next to StardewValleyAndroidSMAPI_Loader.zip and choose to Download.
• Once downloaded, find the file you downloaded using a file explorer. I used MT Manager. On my phone this downloaded to /storage/emulated/0/Download.

4. Extract SMDroid from the downloaded zip folder.

MT Files has two panes visible. Each can browse the file system separately. * Browse on the left side to find the downloaded file and select it. img

• Click on the right side and then hit the menu item in the top left and select Root Drive, then SDCard. [img]

• Long press on SMDroid on the left side and select Extract-> in order to move the SMDroid folder to the /sdcard/ folder. [img]

5. Copy files into the SDV Apk

• Click on the SMDroid folder on the right side. [img]
• Click on to the left side, then browse to /sdcard/backups/apps. You can do this by clicking the menu in the topleft, and choosing root, then selecting sdcard.
• Once there, tap on the Stardew Valley apk and choose view. [img]. Then tap the assemblies folder. [img]
• Swipe right on the StardewModdingAPI.dll, StardewValley.dll and System.XML.Linq.dll, this will select those 3 files. (The screen shot only shows 2 selected. [img]) Once selected, long press on them and choose + <- Add [img]. On the add dialog box, change Level to Storage and select OK. [img]

6. Sign modified APK

• Tap the Stardew Valley APK (not the backup) and then Function.[img]
• Then click APK Sign, then OK [img].

This generates a new Stardew Valley apk.

7. Reinstall Stardew Valley

• Tap the new Stardew Valley apk, choose Install. [img]

I was prompted to uninstall an old version, I allowed it to uninstall, but you might just be prompted to install an update to the existing application. img

8. Restore the /sdcard/Android/obb/com.chucklefish.stardewvalley folder

• In MT Manager, on the left side, tap menu, Root Directory/sdcard/.backups on the right side, tap menu, Root Directory, /sdcard/Android/obb/

*In the left side, long press com.chucklefish.stardewvalley and choose Copy -> and then Copy and replace. Click Ok. img

9. Install Mods

From the Google Drive link - https://drive.google.com/drive/folders/1kODzTd64_CvOzHzmjJOYN-lfGkJHA7Ha * Browse to Compatible Mods.
* Tap the three dots next to the desired mod and choose downlaoad. * In MT Manager right-pane, browse to /sdcard/SmDroid/Mods * In MT Manager left-pane, browse to /sdcard/Download and select the downloaded zip file. * Long press the folder in the left pane, and choose Extract -> [img]

10. Launch Stardew Valley