dalvik

问题 When I run my app on emulator, Android Studio shows this error: E/dalvikvm: Could not find class 'android.util.ArrayMap', referenced from method com.android.tools.fd.runtime.Restarter.getActivities How can I solve that? 回答1: ArrayMap is in the Support Library. You need to add it to the dependencies in build.gradle. dependencies { ... compile "com.android.support:support-core-utils:24.2.0" } 来源： https://stackoverflow.com/questions/39519754/e-dalvikvm-could-not-find-class-android-util-arraymap

问题 Edit : Is this statement "So in android 2.3 concurrent mark and sweep is used for stack related objects treating everything as pointer and copying garbage collection is used for the objects in the heap" correct ? Any one can explain ? garbage collector in android 2.3 I know the subject of Garbage Collection in Android has been discussed, but I can't find a clear and detailed explanation of how it works and specially in the last version of Android which is Jelly Bean 4.2 . In addition to the

问题 I want to run two processes in the same DalvikVM. This means that I want to run a first app and then that this app starts the second app. And I want that this two apps are then running in the same DalvikVM. I think it is possible if the first app forks an process for the second app. But I´m not sure how can I do that. Thanks 回答1: I want to run two processes in the same DalvikVM. By definition, that is impossible. This means that I want to run a first app and then that this app starts the

问题 My application has android-support-v4.jar in /libs only. I do not use other library. My application is crashing with SIGNAL 11 error. I want to use addr2line utility of android-ndk. Can we find the function and line number of java file using this tool? Any help will be very helpful here My application is writing to Bluetooth Socket and in between i am closing the socket I suspect, the error is coming because write() is called after close() of socket But I am not able to find exact line or

问题 I am getting a No implementation found for native Ldalvik/system/VMRuntime;.pauseGc Error, below is the logCat. 05-13 22:39:22.538: W/dalvikvm(8350): No implementation found for native Ldalvik/system/VMRuntime;.pauseGc:(Ljava/lang/String;)I 05-13 22:39:22.543: E/MyThread(8350): Pause GC 05-13 22:39:22.543: E/MyThread(8350): java.lang.reflect.InvocationTargetException 05-13 22:39:22.543: E/MyThread(8350): at java.lang.reflect.Method.invokeNative(Native Method) 05-13 22:39:22.543: E/MyThread

问题 I learned recently of an Android library AndFix which allows for live method patching. Now, as far as I know, Dalvik does not allow runtime manipulation of bytecode or dex. Can someone provide a good explanation on how AndFix does live patching? 回答1: Looking at the sources, you can see the patch mechanism for Dalvik here. The dalvik_replaceMethod() function is modifying the internal Dalvik state, changing the Method struct to point to a replacement method. It doesn't modify the DEX on disk or

问题 Just got error report at Google Play (ex. Android Market) publisher interface. Here is full stacktrace: java.lang.OutOfMemoryError: [memory exhausted] at dalvik.system.NativeStart.main(Native Method) That's it. As far as I understand it crashed without even reaching my code. Is there something I should do or should I simply ignore this error? How could this happen? 回答1: Ignore it, there's nothing you can do. In some cases, you'll get an OutOfMemoryError with a reasonable stack trace. These

问题 I am an interested on working on dalvik vm (Android). I am trying to go through the code of JIT to find out the operations performed by it and how it selects the traces. I am unable to follow the code. So I request all to help me by suggesting relevant functions in JIT that performs trace selection and translation 回答1: You could try git log --grep JIT in the dalvik repository, and looking at the changes and the files changed. That should get you a good idea of where the JIT related code is.

问题 When I launch my application on my phone, I get a lot of the following error from the log : E/dalvikvm( 2052): No free temp registers E/dalvikvm( 2052): Jit: aborting trace compilation, reverting to interpreter E/dalvikvm( 2052): No free temp registers E/dalvikvm( 2052): Jit: aborting trace compilation, reverting to interpreter what's happened ? 回答1: The Dalvik JIT uses a simple & fast register allocator, and generally doesn't know how to spill. In this case, the JIT must have run out of free

问题 Lets assume we have three (or more) classes public class A {} public class B extends A {} public class C extends B implements G {} Assume each class has its own 20 (or more) methods. Is casting to C vs casting to A has larger impact on performance? How does Java casting work under the hood? Does it have to check for all methods and fields for presence by reflection when casting down? Edit: Does the size of classes (number of fields and methods) impacts the performance when casting? I'm