When you set the VM budget on your emulator/device, what you are doing is telling the heap the maximum size it is allowed to be. At runtime, the heap grows dynamically in size as the Dalvik VM requests system memory from the operating system. The Dalvik VM typically starts by allocating a relatively small heap. … Read more
The following list presents the different types of processes in order of importance (the first process is most important and is killed last): Foreground process Visible process Service process Background process Empty process Note: Android ranks a process at the highest level it can, based upon the importance of the components currently active in the … Read more
private static void fixClassLoaderIssue() { ClassLoader myClassLoader = MyClass.class.getClassLoader(); Thread.currentThread().setContextClassLoader(myClassLoader); } This is the code I currently have that I believe fixed this problem. MyClass is just a class I have in my project. Like I said, a co-worked showed it to me, but it seems pretty straight forward.
Good question! I had to dig a bit to figure this out. There are a slew of JNI methods in libandroid_runtime.so that don’t get bound by default, when you’re using the dalvikvm command. Unfortunately, you can’t just do a System.loadLibrary(“android_runtime”), because this doesn’t actually bind all the native methods. However, after some digging, it turns … Read more
As of 4.0 (Ice Cream Sandwich), Dalvik’s behavior should match up with JSR-133 (the Java Memory Model). As of 3.0 (Honeycomb), most of the pieces were in place, but some minor things had been overlooked that would be difficult to encounter in practice (e.g. some edge cases in finalization). As of 2.3 (Gingerbread), Dalvik was … Read more
You can also develop one or more of these as a plugin to your main app, in the form of a separate APK available for download. That APK would expose some component that the main app would use — since I do not know the nature of your integration with these services, I cannot make … 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
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
inSampleSize is a good hint. But a fixed value often doesn’t work fine, since large bitmaps from files usually are user files, which can vary from tiny thumbnails to 12MP images from the digicam. Here’s a quick and dirty loading routine. I know there’s room for improvement, like a nicer coded loop, using powers of … Read more
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