How to convert .jar or .class to .dex file?

Question

I\'m going to edit Opera Mini v6.5 server because it is blocked in our country.

Now I have unpacked the .apk file extracted classes.Dex then converted it via dex2jar

Answer 1

To avoid downloading the entire Android Studio: You can go to command-tools download and extract the folder. Then go into it and find your sdkmanager tool. Then on your command-line type sdkmanager "build-tools;28.0.1". You can select which version of build-tools is appropriate depending on the java version you are working with. This will download it into the root directory of your command-line tools. Go into this folder and you should see the dx tool. Then you can type dx --dex --output="nameoffile.dex" nameoffile.jar.

A little extra note: If you are trying to convert a massive jar you might get a OUT OF MEMORY error. In this case you just pass the JVM the increase heap option dx -JXmx256m ....