if you work with the NativeDK, without that image the emulator is not able to simulate the execution of ARMv7 code (like multicore-instructions and NEON floating-point-unit)

It is the kernel image. You must install it, otherwise the image won&#39;t start, failing with

&gt; ERROR: This AVD&#39;s configuration is missing a kernel file 

The system image is used by the emulator to virtualize the Android OS so Apps can be tested/debugged on a PC without the need to upload the App to a phone whenever a change in the code is made. This speeds up the development process and allows testing for phones that aren&#39;t physically available. 

That&#39;s the emulator image supporting `ARMv7-A` profile hardware, which is true for  all new Android phones.

Since ARMv7-a is backward compatible with ARMv5, it is the only supported image with later system images.

The only line I know,

**I believe you need to use the Android SDK Manager, ARM EABI v7a System image to add that ARM EABI processor support to your local SDK.**

This package is responsible for faster floating point operations

Are any specific settings required on the Java tab of Tomcat configuration tool in order to generate a `hs_err_pid.log` file?

What is the default location of the `hs_err_pid.log` file? Can this location be changed?

What are hs_err_pid.log files generated when Tomcat crashes?

There&#39;re 3 ways to get current interface orientation that I know of:

* `self.interfaceOrientation`
* `[[UIApplication sharedApplication] statusBarOrientation]`
* `[[UIDevice currentDevice] orientation]`

What are the differences among them?

Different ways of getting current interface orientation?

What for do we need ARM EABI v7a System image in Android development?
What is the purpose of that particular image?

What is the use of ARM EABI v7a System image in android?

<p>What for do we need ARM EABI v7a System image in Android development?
What is the purpose of that particular image?</p>


I have some fragments in my activity

    [1], [2], [3], [4], [5], [6]

And on Back Button Press I must to return from [2] to [1] if current active fragment is [2], or do nothing otherwise.

What is the best practise to do that?

**EDIT**: Application must not return to [2] from [3]...[6]

Android Fragment handle back button press

I am receiving return value in the form of long or int from Native code in Android, which I want to convert or match with enum, for processing purpose. Is it possible ?
How?

How to match int to enum

Is there a way to iterate over Java SparseArray (for Android) ? I used `sparsearray` to easily get values by index. I could not find one.


How to iterate through SparseArray?

I&#39;ve a problem I can&#39;t solve: inside a ScrollView I only have a
LinearLayout. By a user action I&#39;m programmatically adding 2 TextView
on this LinearLayout, but by the default the scroll keeps on the top.
Since I controll the user action, I should be easy to scroll to the
bottom with something like:

    ScrollView scroll = (ScrollView) this.findViewById(R.id.scroll);
    scroll.scrollTo(0, scroll.getBottom());

But actually not. Because immediately after adding this two new
elements getBottom() still returns the previous two. I tried to
refresh the state invoking `refreshDrawableState()`, but I doesn&#39;t work.

Do you have any idea how could I get the actual bottom of a ScrollView
after adding some elements?

How to Programmatically Scroll a ScrollView to Bottom

I&#39;m trying to pass a URI-Object to my Intent in order to use that URI
in another activity.

How do I pass a URI?

    private Uri imageUri;
    ....
    Intent intent = new Intent(this, GoogleActivity.class);
    intent.putExtra(&quot;imageUri&quot;, imageUri);
    startActivity(intent);
    this.finish();


How do I use now this URI in my other activity?

     imageUri = extras.getString(&quot;imageUri&quot;); // I know thats wrong ...

How to pass a URI to an intent?

I am reading definitions over and over again and I still not getting what are SP and LR in ARM? I understand PC (it shows next instruction&#39;s address), SP and LR probably are similar, but I just don&#39;t get what it is. Could you please help me?

**edit:** if you could explain it with examples, it would be superb.

**edit:** finally figured out what LR is for, still not getting what SP is for.

What are SP (stack) and LR in ARM?

I have been having this problem for the last few days and I can&#39;t get my head around what is really happening here, or what is the problem.

I have a makefile with these flags:


    CC = arm-linux-gnueabihf-gcc-4.6
    FLAGS = -O3 -march=armv7-a -mtune=cortex-a9 -mfpu=neon -ftree-vectorize -mfloat-abi=softfp -std=gnu99

I have a library in a .a file, which has some object files, all I need to do is link them in with my executable.  I know the prototypes and all that, the only thing that complains is the following:

    /usr/bin/ld: error: *EXECUTABLE* uses VFP register arguments, *OBJECTFILE* does not
    /usr/bin/ld: failed to merge target specific data of file *OBJECTFILE*

When I don&#39;t use the -mfloat-abi=softfp, I get another error relating to floating point registers.

Does anyone have any idea what is causing this, and what I can do to fix this, such as making it so that my executable does not use Virtual Floating Point Register arguments?

    x@x:~/Desktop/perf_test$ make
    arm-linux-gnueabihf-gcc-4.6 -c -O3 -march=armv7-a -mtune=cortex-a9 -mfpu=neon -ftree-vectorize -std=gnu99 -mfloat-abi=softfp  perf_test.c ../baseline/util.c
    arm-linux-gnueabihf-gcc-4.6 -o perf_test perf_test.o util.o  ../baseline/lib.a
    /usr/bin/ld: error: perf_test uses VFP register arguments, perf_test.o does not
    /usr/bin/ld: failed to merge target specific data of file perf_test.o
    /usr/bin/ld: error: perf_test uses VFP register arguments, util.o does not
    /usr/bin/ld: failed to merge target specific data of file util.o
    /usr/bin/ld: error: perf_test uses VFP register arguments, ../baseline/lib.a(a.o) does not
    /usr/bin/ld: failed to merge target specific data of file ../baseline/lib.a(a.o)
    /usr/bin/ld: error: perf_test uses VFP register arguments, ../baseline/lib.a(b.o) does not
    /usr/bin/ld: failed to merge target specific data of file ../baseline/lib.a(b.o)
    /usr/bin/ld: error: perf_test uses VFP register arguments, ../baseline/lib.a(c.o) does not
    /usr/bin/ld: failed to merge target specific data of file ../baseline/lib.a(c.o)
    /usr/bin/ld: error: perf_test uses VFP register arguments, ../baseline/lib.a(d.o) does not
    /usr/bin/ld: failed to merge target specific data of file ../baseline/lib.a(d.o)
    /usr/bin/ld: error: perf_test uses VFP register arguments, ../baseline/lib.a(e.o) does not
    /usr/bin/ld: failed to merge target specific data of file ../baseline/lib.a(e.o)
    /usr/bin/ld: error: perf_test uses VFP register arguments, ../baseline/lib.a(f.o) does not
    /usr/bin/ld: failed to merge target specific data of file ../baseline/lib.a(f.o)
    collect2: ld returned 1 exit status
    make: *** [perf_test] Error 1

ARM compilation error, VFP registers used by executable, not object file

I&#39;ve seen [a lot of talk about running Mono/.NET code on the Raspberry Pi][1]. Has there been any success in actually running any Mono code on a Raspberry Pi?

On their site, they list several Linux distributions that work on the device and some of these distributions include Mono. However, none detail whether Mono works on it.

Is there a working implementation?

  [1]: https://stackoverflow.com/questions/9547047/monodevelop-armv6-raspberry-pi


Mono on Raspberry Pi

under &quot;The Thumb instruction set&quot; in section 1-34 of &quot;ARM11TechnicalRefManual&quot; it said that:  

&quot;The Thumb instruction set is a subset of the most commonly used 32-bit ARM instructions.Thumb instructions are 16 bits long,and have a corresponding 32-bit ARM instruction that has the same effect on processor model.&quot;  

can any one explain more about this especially second sentence and say how does processor perform it?

What is the ARM Thumb Instruction set?

&gt; **TL/DR**: Where can I find more information about building a GCC 4.7.0 cross-compiling toolchain for ARM (gnueabi) platform (intended to run on a Raspberry Pi device)?

I have just got a brand new Raspberry Pi and I am very eager to start programming for it. I&#39;ve managed to install the GCC toolchain (I am using the Arch Linux system image) and compiled some basic programs, all working fine.

I&#39;ve also tried to compile the Boost libraries because I often use them in my projects and everything seemed to work fine by following the instructions (`./bootstrap.sh` + `./b2`) except for the fact that the compilation was painfully slow. I left it on for a few hours but it barely got past the first few source files. After I left it running for the night, I discovered that the build process aborted due to RAM shortage.

So, my guess is that Rasp Pi is simply underpowered for compiling something of such size as Boost. So, cross-compilation comes to my mind. However, even though there is a lot of information about ARM cross compilation available online, I find it confusing. Where does one even start? 

I have a recent GCC version (4.7.0) available on my Raspberry Pi, so I would ideally like to cross-compile with the same version. Where can I get the GCC 4.7.0 toolchain for ARM? (I will be compiling on x86 CentOS 6.2)

**Edit:**

I deallocated unneeded GPU memory and set up a 4GB swap partition on a USB drive, while build files are on a NFS share. Boost is now compiling much much faster, so it is manageable. I would still like to know how can I set up a GCC 4.7 toolchain for cross compilation on my x86 PC though, since I intend to do a lot of compiling and I would like it to be as fast as possible.

**Edit 2:**

Since GCC 4.7.0 is relatively new, there does not seem to be a pre-built cross-compiler (i386-&gt;ARM). I will probably have to build one myself, which seems an non-trivial task (I&#39;ve tried and failed). Does anyone know of a tutorial to follow for building a GCC cross-compiler, hopefully for one of the recent versions?  

I&#39;ve tried with [this great shell script][1] (which worked great for building a same-arch compiler) and I&#39;ve successfully built `binutils` and GCC&#39;s prerequisites, but then GCC build kept failing with many cryptic errors. I am really lost here, so I would greatly appreciate your help.

GCC on Raspberry Pi was configured with

    --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib 
    --mandir=/usr/share/man --infodir=/usr/share/info 
    --with-bugurl=https://bugs.archlinux.org/ 
    --enable-languages=c,c++,fortran,lto,objc,obj-c++ --enable-shared 
    --enable-threads=posix --with-system-zlib --enable-__cxa_atexit 
    --disable-libunwind-exceptions --enable-clocale=gnu 
    --disable-libstdcxx-pch --enable-libstdcxx-time 
    --enable-gnu-unique-object --enable-linker-build-id --with-ppl 
    --enable-cloog-backend=isl --enable-lto --enable-gold 
    --enable-ld=default --enable-plugin --with-plugin-ld=ld.gold 
    --with-linker-hash-style=gnu --disable-multilib --disable-libssp 
    --disable-build-with-cxx --disable-build-poststage1-with-cxx 
    --enable-checking=release --host=arm-unknown-linux-gnueabi 
    --build=arm-unknown-linux-gnueabi 

**Edit 3:**

I managed to build a 4.7 GCC toolchain for ARM (yay!) using [this shell script][2] as suggested by user dwelch in the comments. I also built `newlib` and `libstdc++` using [this article][3] as a guide. The toolchain works fine, but hen I run the executable on my Raspberry Pi, it fails with `Illegal instruction`. What could be the cause of that? 


  [1]: http://joelinoff.com/blog/?p=658
  [2]: http://github.com/dwelch67/raspberrypi
  [3]: http://wiki.osdev.org/OS_Specific_Toolchain

Content Type	Original Author	Original Content on Stackoverflow
Question	Sunil Gandham	View Question on Stackoverflow
Solution 1 - Android	noone	View Answer on Stackoverflow
Solution 2 - Android	rds	View Answer on Stackoverflow
Solution 3 - Android	Benjamin-M-Dale	View Answer on Stackoverflow
Solution 4 - Android	auselen	View Answer on Stackoverflow
Solution 5 - Android	user370305	View Answer on Stackoverflow
Solution 6 - Android	Arif ul Hoque	View Answer on Stackoverflow

What is the use of ARM EABI v7a System image in android?

Android Problem Overview

Android Solutions

Solution 1 - Android

Solution 2 - Android

Solution 3 - Android

Solution 4 - Android

Solution 5 - Android

Solution 6 - Android

Different ways of getting current interface orientation?

What are hs_err_pid.log files generated when Tomcat crashes?

Attributions