art-runtime

Google added a new ART runtime with Android 4.4. How can I determine whether ART or Dalvik is the current runtime? Update At least, as early as June 2014 Google has released an official documentation on how to correctly verify the current runtime in use : You can verify which runtime is in use by calling System.getProperty("java.vm.version"). If ART is in use, the property's value is "2.0.0" or higher. With that, now there is no need to go through reflection and simply check the corresponding system property: private boolean getIsArtInUse() { final String vmVersion = System.getProperty("java

i dont know why but a week ago when i am debugging my app in android studio, the app in device is very slow, but if a generate the APK or use the play (Not debug) option works fine.. Anyone have idea why? I think i didnt any change in sdk or in the app to do it this.. When ART is enabled, the device cannot ensure the compiled code matches the bytecode instructions. It therefore cannot step through instructions and therefore lines. This forces the device to fallback to a very slow interpreter, which possibly doesn't even JIT-compile. For faster debugging, switch back to Dalvik. 来源： https:/

Currently, it's possible to dynamically load .dex classfiles into Android's Dalvik VM. This could probably also be used for dynamic code generation at runtime . Is this still possible with the upcoming ART runtime ? It seems to work just like it did with Dalvik. Thanks to matiash for referencing the I/O 2014 talk! I've watched the video recording of it, and here is what the developers have to say on runtime code loading (taken from the transcript): [Question from the audience:] So I was wondering how ART is going to jive[?] with byte code injection that might happen right after compilation or

Does the Android ART runtime have the same method limit limitations as Dalvik? Currently, there's a limit of 64k methods in the primary dex file fadden The issue is not with the Dalvik runtime nor the DEX file format, but with the current set of Dalvik instructions . Specifically, the various method invocation methods, which look like this: invoke-kind {vC, vD, vE, vF, vG}, meth@BBBB B: method reference index (16 bits) You can reference a very large number of methods in a DEX file, but you can only invoke the first 65536, because that's all the room you have in the method invocation