java2smali

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

Compile:

./gradlew build

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.

Related

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