GitHub - RevEngiSquad/java2smali: Command-line tool for compiling .java to .smali

Fork of https://github.com/izgzhen/java2smali.git, uses d8 instead of dx.

Compile:

Run (in Unix system):

java -jar java2smali.jar ./examples/example/Example.java

Then you should be able to find *.smali files in the example/ directory.

Another example run with imports:

APP_CLASSPATH=./examples java -jar java2smali.jar ./examples/example2/Example2.java

Another example with android imports:

APP_CLASSPATH=~/Library/Android/sdk/platforms/android-28/android.jar java -jar java2smali.jar ./examples/example3/Example3.java

sometimes default android.jar is not enough i.e, missing some classes, you can specify your own android.jar or give this a try which includes almost all classes.

APP_CLASSPATH=rt.jar java -jar java2smali.jar ./examples/example3/Example3.java

or, you can grab the java2smali.jar with android.jar included from the releases and use it.

Note that Example2.java import example.Example, so you must specify its class path directory.

https://github.com/Belluxx/Java2Smali.git is another similar project but have issues with single file input.

https://github.com/ollide/intellij-java2smali is a IntelliJ plugin.

https://r8.googlesource.com/r8/+/1.0.21/tools/java2smali.sh is a bash script that doesn't work off-the-shelf.

The following steps might work as well, as long as the *.java file does not have a package namespace.

javac HelloWorld.java
dx --dex --output=classes.dex HelloWorld.class
baksmali classes.dex

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