This way we can support all JVM languages while keeping ART and Dalvik compatibility. If you wondered about Kotlin support, it does support it - “JRebel for Android works on a bytecode level. For sure it has not only pros but cons also. Previously I used debug feature “Evaluate Expression” to “swap” code (actually just ran multiple times different code until I get a correct result out of it and relaunch app). But updating code during debugging is amazing. You can continue updating the code and resources when a debugger is attached to get instant insight into the application.” Here I had issues with old devices, they just hanged on me. “Debug an application directly by using “Debug with JRebel for Android” to install the application or to attach it to a running process. You can swap code during debug sessions with it! Idea version is more stable because new features come to Android Studio branch first. The plugin is available for Android Studio and IntelliJ Idea. but when an unsupported annotation processor is detected, JRebel for Android will disable the incremental Java compilation. class file timestamp is then monitored for changes in the loaded class and updates are propagated through the extended class loader, to your application.” As for development tools and instruments, it supports most of Annotation processing libraries, Dagger/Dagger 2, IcePick, ButterKnife etc. class file JRebel instruments the loaded class and associates it with the found. It will search from the classpath and from the places specified in the rebel.xml configuration file. When a class is loaded JRebel will try to find a corresponding. It does not create any new class loaders, instead, it extends the existing ones with the ability to manage reloaded classes. The second question in their FAQ is - “How does it work?” - “JRebel integrates with the JVM on the class loader level. In table below you can see comparison when Instant Run and JRebel can apply warm swaps.Īs you can see JRebel has more to offer for developers. Depending on your Android Studio build preferences when you use Instant Run it will warm swap your code by default or hot swap it if you change this setting and always warm swaps your resources, on another hand JRebel will always use warm swaps if it’s possible so user could understand what is happening and what to expect. This swap requires app restart but it is still faster than rebuilding APK. Cold swap is used for structural changes that can not be supported by previous two. It is not instant, but for me applying changes without rebuilding app was 5 times faster and you don’t have to renavigate inside your app to find needed fragment and recreate its state. JRebel preserves your Fragment state and back stack or even ViewPager current page. It updates apps resource files and restarts Activities/Fragments so you could see changes. Warm swap is useful for updating app resources. This is done by adding stub methods that will be executed the next time the method is called. But this swap is limited only to changing method bodies. This means that all objects could refer to an updated class and execute new code when their methods were called. It allows updating class bytecode in place, using the same class identity. Hot-swap updates your app without new APK. There are three types of code swaps: hot, warm and cold swaps. So you save time by not rebuilding and packaging code parts that have not changed, fewer data pushed to the device over ADB and the dex2oat has a lot less work to do, compared to a full APK install. If APK is already installed on the device you just send small incremental patches that will be applied. JRebel For Android and Instant Run are all about code or resources swapping. You will ask, why would I need such tool if I already use Android Studio’s “ Instant Run”, well, as their official page states - JRebel offers much more plus Instant Run has his issues. So here is some basic info about it straight from their official page - “JRebel for Android is an Android Studio and IntelliJ IDE plug-in that accelerates the development of Android applications by eliminating the time consuming full build, install and run cycle, saving hours of developer time annually.”
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