Develop Reference

android studio importing project error

Error:Unable to start the daemon process.
This problem might be
caused by incorrect configuration of the daemon. For example, an
unrecognized jvm option is used. Please refer to the user guide
chapter on the daemon at
https://docs.gradle.org/2.14.1/userguide/gradle_daemon.html
Please
read the following process output to find out more:
Error occurred during initialization of VM
Could not reserve enough space for 2097152KB object heap

Try this:
Go to Start-> Control Panel-> System-> Advanced(tab)-> Environment Variables-> System
Variables-> New:_JAVA_OPTIONS
Variable value: -Xmx512M
Variable name: Path
Variable value: %PATH%;C:\Program Files\Java\jre8\bin;F:\JDK\bin;
Change this to your appropriate path.

android SDK gradle error

Gradle sync failed: Unable to start the daemon process.
This problem might be caused by incorrect configuration of the daemon.
For example, an unrecognized jvm option is used.
Please refer to the user guide chapter on the daemon at https://docs.gradle.org/2.14.1/userguide/gradle_daemon.html
Please read the following process output to find out more:
-----------------------
Error occurred during initialization of VM
Could not reserve enough space for 1572864KB object heap
Consult IDE log for more details (Help | Show Log)
it displaying error when I am starting the android SDK. how to resolve it and thanks in advance. please apologize me if I made any grammatical or spelling mistakes.

Kernel Configuration - Nexus Platform join failed

I am doing kernel configuration for ICS. I needed to enable Posix message queue as it is required in one of our applications. But enabling this option resulted in error. The make was successfull. But the image could not be loaded. The dmesg was:-
disagrees about version of symbol module_layout.
init: untracked pid 2038 exited.
logcat :-
mknod : '/dev/nexus_proxy' failed
NEXUS_Platform_Join [CONSTRUCTOR] failed.

Looks like you rebuilt only the kernel.
You need to build any kernel-modules (*.ko files) and
update them onto the filesystem.
Here is a detailed discussion on the disagrees about version of symbol error.

the error about transplantation VXL to android

I want to transplant the VXL(the Vision-something-Libraries) to android platform.the crosscompiler I used is android-cmake.
you can get the VXL from the url http://vxl.sourceforge.net/ .the version i used is vxl-1.14.0
you can get the android-camke from the url http://code.google.com/p/android-cmake/
when I properly setup my NDK for cmake,and specify the Standalone Toolchain as the introduction of android-camke.Then,I use andriod-camke to compile the VXL.But I encounter many error.it can't produce the Makefile . somebody know why?
Next is the error log.
l00138375#l00138375:/home/hm/build-vxl$ android-cmake ../vxl-1.14.0
CMake Warning at /home/hm/android/android-cmake/toolchain/android.toolchain.cmake:281 (message):
Using value of obsolete variable ANDROID_NDK_TOOLCHAIN_ROOT as initial
value for ANDROID_STANDALONE_TOOLCHAIN. Please note, that
ANDROID_NDK_TOOLCHAIN_ROOT can be completely removed in future versions of
the toolchain.
Call Stack (most recent call first):
/home/hm/android/android-cmake/toolchain/android.toolchain.cmake:376 (__INIT_VARIABLE)
/usr/share/cmake-2.8/Modules/CMakeDetermineSystem.cmake:89 (INCLUDE)
CMakeLists.txt:13 (PROJECT)
........
-- Check if the system is big endian - little endian
-- Performing Test VCL_CHAR_IS_SIGNED
CMake Error: TRY_RUN() invoked in cross-compiling mode, please set the following cache variables appropriately:
VCL_CHAR_IS_SIGNED (advanced)
VCL_CHAR_IS_SIGNED__TRYRUN_OUTPUT (advanced)
For details see /home/hm/build-vxl/TryRunResults.cmake
-- Performing Test VCL_CHAR_IS_SIGNED - Failed
-- Looking for 8-bit int. [Checking char...]
CMake Error: TRY_RUN() invoked in cross-compiling mode, please set the following cache variables appropriately:
RUN_RESULT (advanced)
RUN_RESULT__TRYRUN_OUTPUT (advanced)
For details see /home/hm/build-vxl/TryRunResults.cmake
.........
-- Performing Test VCL_NUMERIC_LIMITS_HAS_INFINITY
CMake Error: TRY_RUN() invoked in cross-compiling mode, please set the following cache variables appropriately:
VCL_NUMERIC_LIMITS_HAS_INFINITY (advanced)
VCL_NUMERIC_LIMITS_HAS_INFINITY__TRYRUN_OUTPUT (advanced)
For details see /home/hm/build-vxl/TryRunResults.cmake
-- Performing Test VCL_NUMERIC_LIMITS_HAS_INFINITY - Failed
-- Performing Test VCL_PROCESSOR_HAS_INFINITY
CMake Error: TRY_RUN() invoked in cross-compiling mode, please set the following cache variables appropriately:
VCL_PROCESSOR_HAS_INFINITY (advanced)
VCL_PROCESSOR_HAS_INFINITY__TRYRUN_OUTPUT (advanced)
For details see /home/hm/build-vxl/TryRunResults.cmake
-- Performing Test VCL_PROCESSOR_HAS_INFINITY - Failed
-- Looking for C++ include inttypes.h
-- Looking for C++ include inttypes.h - found
-- Looking for memalign
-- Looking for memalign - found
-- Could NOT find DC1394 (missing: DC1394_LIBRARIES DC1394_INCLUDE_DIR)
-- Performing Test DIRECTSHOW_SOURCE_COMPILES
-- Performing Test DIRECTSHOW_SOURCE_COMPILES - Failed
CMake Error at config/cmake/Modules/NewCMake/FindDirectShow.cmake:101 (MESSAGE):
Uncomment code below: FindPackageHandleStandardArgs is now available.
Call Stack (most recent call first):
core/vidl/CMakeLists.txt:13 (INCLUDE)

As Andrey's comment mentions, the way VXL uses CMake, prevents cross-compilation. However there is an alternative. One of the maintainers maintains branches containing alternative build systems for the core libraries. The vxl-build-makefiles branch ought to be a good starting point to modify to work with a cross-compiler.
http://sourceforge.net/p/vxl/svn/36716/tree/branches/vxl-build-makefiles/
If you have any questions about using the branch, or indeed anything else about VXL - the vxl mailing lists are probably more use. vxl-users#lists.sourceforge.net

dalvikvm is not showing LOGD messages of JIT Options

I have made some minor changes to /dalvik/vm/interp/Jit.cpp
(wrote some LOGD messages) and built dalvikvm using
$make dalvikvm
and the build was successful and got the executable in /out/
target/product/generic/system/bin/dalvikvm.
Now i started an emulator and pushed dalvikvm into /data and
executed a sample java program (with some 30 loops) using
$/data/dalvikvm -Xbootclasspath:/system/
framework/core.jar -classpath /data/CmdLine.jar TestAppActivity
(created CmdLine.jar from sample program by following
instructions given in http://davanum.wordpress.com/2007/12/04/command-line-java-on-dalvikvm/
)
now when i check the logcat there is no messages which i have
written using LOGD is displayed. Do we need to add any option to
dalvikvm command line to enable JIT? what could be the problem here?
Thanks

Jit is enabled by default if you are using android version above 2.2 i suppose. Your problem is the profiling of JIT has to be enabled in dvm. This can be don by looking into dalvikvm --help .... I think dalvikvm -Xjitprofile -Xjitverbose should do and before that export your environment variable to log the message too.

Try exporting the logs before running the dalvikvm something like this
export ANDROID_LOG_TAGS="ActivityManager:I MyApp:D *:S" the variables D -Debug S: lowest level V - verbose which is the level of log you need the application to be logged.

dalvikvm is just the starter binary. The important stuff lives in libdvm.so so you have to build and replace this rather than dalvikvm.