Mobile File and Java Tutorials

Step-by-step guides for opening SB3 projects, working with Android files and running Java apps.

SB3 project guides

Open and play Scratch-compatible .sb3 project files on mobile devices.

Open Scratch SB3 Files on iPhone & iPadImport and play an .sb3 project on iOS or iPadOS. Open Scratch SB3 Files on AndroidImport and play an .sb3 project on an Android phone or tablet.

Android file and Java guides

Open archives, run Java programs and inspect specialized file formats.

How to Run JAR Files on AndroidUse Jre4Android to run compatible Java JAR apps directly on Android. Run Java Swing Apps on AndroidLaunch desktop-style Java Swing GUI apps with touch, zoom and virtual mouse controls. How to Run .class Files on AndroidRun compiled Java CLASS files from your Android device. J2ME Emulator for AndroidRun classic Java ME apps and games on Android. How to Open JAR Files on AndroidOpen, browse and inspect Java JAR archives on Android. How to View MANIFEST.MFCheck Main-Class, Manifest-Version and other JAR metadata. How to Decompile CLASS FilesInspect and decompile supported Java bytecode on Android. How to Extract JAR Files on AndroidExtract resources and files from Java JAR archives. Check Android 16KB Page Size SupportInspect .so files and verify possible Android 16KB compatibility issues. How to Open OBB Files on AndroidOpen, browse and extract Android OBB expansion files. How to Open DAT Files on AndroidOpen, view and extract DAT files on Android.