Do the Android Dalvik standard libraries have any class similar to the undocumented class sun.misc.Unsafe in Java SE which allows direct access to memory.

I've got a class in which I do some runtime annotation scanning, but it uses the deprecated DexFile APIs which causes a warning to appear in LogCat: W/zygote64: Opening an oat file without a cla...

I just want to know : Who created the dalvik_Vm ? Is the zygote process running in the vm or contrary?

I'm trying to generate Javadoc using latest Android Studio via built in tool: Tools=>Generate Javadoc... Whatever I choose from a tool's parameters window there are a lot of errors thrown, regar...

I am going to learn a little bit about Dalvik VM, dex and Smali. I have read about smali, but still cannot clearly understand where its place in chain of compilers. And what its purpose. Here some...

I've noticed that when users on Android-OS devices visit my site, there's constantly two requests happening on each page. The first is the normal browser, and the second is from "Dalvik". Example: ...

Android Browsers is sending Dalvik as the user agents in the request headers. I am currently working on a mobile site having a simple login page that validates username and password then authorize...

In the following SO question: https://mcmap.net/q/127844/-fast-bitmap-blur-for-android-sdk @zeh claims a port of a java blur algorithm to C runs 40 times faster. Given that the bulk of the code in...

I know this may be a basic question in Android. But what is Dalvik and dalvik-cache?

I want to test android apps' memory performance, and I want to get memory information automaticaly. I use 'adb shell dumpsys meminfo ...' to get memory infomation periodicaly. Now, I want to observ...

In theory, Dalvik executes any virtual machine byte code, created for example with the compilers of AspectJ ColdFusion Clojure Groovy JavaFX Script JRuby Jython Rhino Scala Are there alr...

Since Android Lollipop, Google has replaced DVM with ART because ART is faster than DVM. Is there any other reason for that?

In android, are using static variables a recommended practice? E.g, implementing a Singleton pattern in Java, I usually do: private static A the_instance; public static A getInstance() { if (the_i...

Lately when I try debugging an android test instrumentation APK, every time the app is launched I see something like this in the logcat W/com.myapp: Verification of void com.myapp.test.hiptest.Act...

Google added a new ART runtime with Android 4.4. How can I determine whether ART or Dalvik is the current runtime?

I'm getting crashes from numerous devices for a native crash for my Android game, GeoGuess (https://play.google.com/store/apps/details?id=uk.co.quinny898.game.geoguess) It's all Java, so I don't s...

when using ar.toArray(new String[ar.size()]) Android studio 3.2.1 warns about pre-sized array and recommends empty array: There are two styles to convert a collection to an array: either using ...

Google is moving from Dalvik to ART(Android Runtime). I was trying to understand, how it is going to improve the performance. The best explanation I found is the below image: One of the main c...

Recently I have read about the Dalvik 65K method limit. I have understood that the method invocation list can only invoke first 65536 method references. To tackle this, we have a number of solution...

Is there any way to make an Android application to download and use a Java library at runtime? Here is an example: Imagine that the application needs to make some calculations depending on the i...

As we all know Java 5 introduced the ability for Instrumentation to get the size of an object with ease. Is there such a method on Android and Dalvik? The java.lang.instrument package is not avail...

I have an Android app that uses NDK - a regular Android Java app with regular UI and C++ core. There are places in the core where I need to call Java methods, which means I need a JNIEnv* for that ...

This isn't intended to be a question. Rather, an observation which is a common problem found in Android when you use external APIs for development and android.jar isn't duplicated into your project...

Is there an easy way to crash an app with a native crash, in order to test native crash reporting? note that I'm looking for a general solution for all devices, and not device specific. I thought ...

After some android apps installed, I found that it will change to odex file (not apk) in smartphone. How does it happens? Who can teach me, I am very interested about it.