I was under the impresssion that android didn’t use oracle java, it uses a subset of apaches harmony java: http://en.wikipedia.org/wiki/Apache_Harmony#Use_in_Android_SDK http://arstechnica.com/open-source/news/2010/11/apache-foundation-to-vote-down-java-7-protesting-oracle-abuses.ars
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 … Read more
There are some major performance improvements that ART brings which were lacking in Dalvik. But every pros have some cons too. I will try to discuss both the advantages and disadvantages here. 1) Compilation Approach This is by far the biggest advantage of ART over Dalvik. The old guy Dalvik used Just-In-Time (JIT) approach in … Read more
I have done a framework that works like Robo-guice with some of its primary IoC functions. (Cut down on boilerplate codes that load views/service etc…) But the core of which, I believe is the solution to your problem, is the ability to load separate APK “plugin” files, that includes “res” as well as <layouts>.xml files. … Read more
Add !code/allocation/variable is workaround for ProGuard bug when -dontobfuscate is set to your -optimizations For example -optimizations !code/simplification/arithmetic,!field/*,!class/merging/*,!code/allocation/variable
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 … Read more
I haven’t read your question completely, but first of all do not use volatile, even opengles coders do not use it for different ui vs renderer threads. Use volatile if and only if one thread writes (say to some class’ static property) and other reads, even then you have to synchronize, read this for some … Read more
dexopt does some optimizations on the dex file. It does things like replacing a virtual invoke instruction with an optimized version that includes the vtable index of the method being called, so that it doesn’t have to perform a method lookup during execution. The result of dexopt is an odex (optimized dex) file. This is … Read more
When you create an application code, the apk file contains a .dex file, which contains binary Dalvik bytecode. This is the format that the platform actually understands. However, it’s not easy to read or modify binary code, so there are tools out there to convert to and from a human readable representation. The most common … Read more
From the developer docs: Every Android application runs in its own process, with its own instance of the Dalvik virtual machine. Dalvik has been written so that a device can run multiple VMs efficiently. The Dalvik VM executes files in the Dalvik Executable (.dex) format which is optimised for minimal memory footprint. The VM is … Read more