Android doesn’t use Oracle’s Java SE versions, it’s based on parts of the Apache Harmony project so it doesn’t even support Java 7. Harmony is not actively developed any more and won’t support 1.7. Unless Google decides to upgrade Harmony and the Android SDK to a newer Java version, there won’t be any Java 7 … Read more
There is a number of things that Dalvik will not handle or will not handle quite the same way as standard Java bytecode, though most of them are quite advanced. The most severe example is runtime bytecode generation and custom class loading. Let’s say you would like to create some bytecode and then use classloader … Read more
You have same jar library included twice. Check your application and all referenced Android libraries and make sure you have all jars included exactly once. If that does not help, take a look at http://tools.android.com/knownissues. Specifically look at first issue described in Build System section. Also you can read this post: How to fix the … Read more
static fields are attached to the Class instance as a whole, which is in turn attached to the ClassLoader which loaded the class. the_instance would be unloaded when the entire ClassLoader is reclaimed. I am 90% sure this happens when Android destroys the app (not when it goes into the background, or pauses, but is … Read more
Q. how does zygote exactly fork Dalvik VM? Short Answer: The Zygote process cold boots a Java VM on system start up. It then listens to a socket for incoming commands. Other processes (e.g. ActivityManagerService) write commands to this socket whenever a new process is needed for an application. These commands are read by the … Read more
At launch, Java was the only officially supported programming language for building distributable third-party Android software. Android Native Development Kit (Android NDK) which will allow developers to build Android software components with C and C++. In addition to delivering support for native code, Google is also extending Android to support popular dynamic scripting languages. Earlier … Read more
This is Ben, one of the engineers working on the JIT @ Google. When Bill and I started on this project, the goal was to deliver a working JIT as soon as possible with minimal impact to resource contention (eg memory footprint, CPU hijacked by the compiler thread) so that it can run on low-end … Read more
UPDATE: As I promised yesterday, I added some more links to the list. Ufff. Not much documentation around! Best advice? Decompile, and read, and tweak, and see how it did, and start the cycle again and again. But you did not ask for that advice, right? 😉 Now, there are a few places out there … Read more
Sorry, I’m late and the question has already an accepted answer, but yes, you can download and execute external libraries. Here is the way I did: I was wondering whether this was feasible so I wrote the following class: package org.shlublu.android.sandbox; import android.util.Log; public class MyClass { public MyClass() { Log.d(MyClass.class.getName(), “MyClass: constructor called.”); } … Read more
Dalvik is the virtual machine that is used by Android. It is generally thought of as a Java virtual machine, although this is not precisely correct. It uses an object model that is identical to Java, and its memory model is also nearly equivalent. But the dalvik VM is a register based VM, as opposed … Read more