, lets be honest: are ****.
Unstable, Buggy and **** like that.
And instead of just complaining about the devs* I want to know the following:
If I want to contribute on the code what do I need to learn? Since a while I'm teaching myself Java and Python via Solo Learn. What would I need to learn to contribute to the Android OS Code itself NOT APPS!!
It will take me months, years I am aware of that. But I'm just tired of only trying different Custom ROMS, only to see that most of them aren't a real alternative of the Stock Roms, without having the possibility to do something about it.
So feed me with some input. What are good sites to learn that?
Happy for your feedback!
*Because damn I know that the Devs are doing an amazing job!
Google is a good start.. that search engine can point you in the right direction ?
Ghost1607 said:
And instead of just complaining about the devs* I want to know the following:
If I want to contribute on the code what do I need to learn? Since a while I'm teaching myself Java and Python via Solo Learn. What would I need to learn to contribute to the Android OS Code itself NOT APPS!!
It will take me months, years I am aware of that. But I'm just tired of only trying different Custom ROMS, only to see that most of them aren't a real alternative of the Stock Roms, without having the possibility to do something about it.
So feed me with some input. What are good sites to learn that?
Click to expand...
Click to collapse
It really depends on what you want to do with Android. The upper layers are in Java. The lower layers are in C++ or C. If you want to adjust the stock libs you might have to understand ARM assembler code. Also a basic knowledge of microcontrollers and linux kernel does help (especially if it comes to the graphic and camera subsystems).
There is almost no documentation for Android (the code is the documentation) and the subsystems change from version to version. The best way (and probably only one) to learn Android is hands on. Just try to fix the most annoying bug you encounter. Try to understand how the source-code works. Check how the Java, C++ layers, kernel and the stock libs interact with each other.
Also try to understand the adb logcat output.
Also try to understand the G800F device tree. A first step is also to compile the source yourself.
hennymcc said:
It really depends on what you want to do with Android. The upper layers are in Java. The lower layers are in C++ or C. If you want to adjust the stock libs you might have to understand ARM assembler code. Also a basic knowledge of microcontrollers and linux kernel does help (especially if it comes to the graphic and camera subsystems).
There is almost no documentation for Android (the code is the documentation) and the subsystems change from version to version. The best way (and probably only one) to learn Android is hands on. Just try to fix the most annoying bug you encounter. Try to understand how the source-code works. Check how the Java, C++ layers, kernel and the stock libs interact with each other.
Also try to understand the adb logcat output.
Also try to understand the G800F device tree. A first step is also to compile the source yourself.
Click to expand...
Click to collapse
Thank you for the reply I appreciate it!
TWRP
hennymcc said:
It really depends on what you want to do with Android. The upper layers are in Java. The lower layers are in C++ or C. If you want to adjust the stock libs you might have to understand ARM assembler code. Also a basic knowledge of microcontrollers and linux kernel does help (especially if it comes to the graphic and camera subsystems).
There is almost no documentation for Android (the code is the documentation) and the subsystems change from version to version. The best way (and probably only one) to learn Android is hands on. Just try to fix the most annoying bug you encounter. Try to understand how the source-code works. Check how the Java, C++ layers, kernel and the stock libs interact with each other.
Also try to understand the adb logcat output.
Also try to understand the G800F device tree. A first step is also to compile the source yourself.
Click to expand...
Click to collapse
Dear hennymcc,
it is about your TWRP for G800F.
Everthing is ok, till it comes to a restore of a TWRP backup.
After the restore the S5 Mini is in a bootloop.
I have tried it with the version August 2015 and March 2016.
Is there any solution?
Thank you.
Related
Hi I'm just wondering where to learn how to make custom roms?
I find it very interesting but guess I don't quite understand it just yet.
I have built cupcake and tried to run it in the emulator following the steps google gives on the source code page, but it never gets past "Android" with a flashing cursor and a black background on the emulator and i've never tried to flash it to the phone as im not brave enough being i really dont know what i'm doing. I would like to use the files in JF's build so i have root and what not, maybe poke around the code a little, see how things work. I wish someone would make a beginers tutorial for for this. I know its not easy and you need to know how to program. and programing shouldn't be part of the tutorial, but just how to get all the files maybe make a small change to one or two of them and then build it and see those changes at work would be nice.
Thanx for any help!
there is no beginners guide to programming the android OS, either you can look at the source and edit to your liking or you can't. for the most part the guys that have been building the ROMs have been working with programming for a long time and know what they are doing. i am working on it, but my java is old knowlege and i don't remember much. you will need to learn java in order to play with building your own ROM
I'm not so much talking about editing the source as just take the source and build it so i can run it in the emulator. I'm not that great with linux, and i did build it, but i think i did somthing wrong because it freezes at the android screen. I know im not going to just grab the code and start changing it with no experiance. I just want to mess around and see what i can learn.
So this is combination question/idea.
I have been reading around and it seems to me that most ROMs are made mostly just by taking existing ROMs (often taking the stock one) and editing the installed applications. This is what Kitchens do - right?
When we want to theme things we have to go through and manually edit all sorts of images, resources, compiled xml files, etc.
That all being said why don't people ever just take the source from google (android is open source) and just modify the source to their liking and compile their own ROM? Do people already do this? Wouldn't this making theming a lot easier by just replacing the files before it is all compiled together?
Why don't we just compile a version that lets you theme most things pretty easily - make large parts of the UI skinnable and then people don't have to spend so much time hacking xml files?
Again, this all may be completely wrong and I apologize for wasting your time for reading this if it is...
Just wondering if there is an easier way to do what we are doing
you should do some research on the Cyanogen mod and Android open source project (AOSP)
you're on the right track with where you're going with this, but it's already been done. most ROMs ARE in fact modified versions of 2.1 with edited image files, added applications and such and that's really all we can do, until now at least. some of our devs are working on porting ROMs based off of the Cyanogen mod, which is based off of AOSP.
someone please correct me if I'M wrong =)
I've found the following links to be really helpful:
1) http://forum.xda-developers.com/showthread.php?t=622916 - compiling Hero kernel & AOSP from source
2) http://blog.coralic.nl/2010/01/28/build-eclair-aka-android-2-1-for-hero-from-source/ - blog entry that #1 was based off of
3) http://forum.androidcentral.com/htc...how-build-your-own-kernel-package-source.html - sort of the same thing again, but it's good to read different takes on things like this
4) http://forum.xda-developers.com/showthread.php?t=633246 - very good kitchen
gnarlyc
I could be wrong, but the Google source code will be rather "generic" or all-encompassing. It will (or should) work for ALL Android hardware devices. Problem with that is that it's not optimized for a specific piece of hardware. Same logic applies with compiling your own kernel in Linux. Linux includes hardware support for thousands and thousands of pieces of hardware (and some obscure sh*t at that). Granted, it's not loaded into memory but the code is still in there. When people compile there own kernel, they only include drivers for their video card, their IDE/SATA controllers, their CPU, and so on.
When people start with an ERIS ROM or HERO ROM from HTC, I have to presume that HTC has already stripped out the non-applicable stuff. It's a much cleaner slate to start from.
gnarlyc said:
I've found the following links to be really helpful:
1) http://forum.xda-developers.com/showthread.php?t=622916 - compiling Hero kernel & AOSP from source
2) http://blog.coralic.nl/2010/01/28/build-eclair-aka-android-2-1-for-hero-from-source/ - blog entry that #1 was based off of
3) http://forum.androidcentral.com/htc...how-build-your-own-kernel-package-source.html - sort of the same thing again, but it's good to read different takes on things like this
4) http://forum.xda-developers.com/showthread.php?t=633246 - very good kitchen
gnarlyc
Click to expand...
Click to collapse
Funny you mention that, I just installed an Ubuntu VM so that I could check out the source and start playing around... see what there is to see
http://htc-linux.org/wiki/index.php?title=Mega
i read that the kernel is same wont that help porting andriod with respect to some drivers change!!!
no one answered
the problem is our first developer can't keep the android project...
hi
how can i debug this files and run???
currently I'm trying to cross-compile a most recent wildfire kernel I found on htc server using a configuration I personally made for our mega. The problem is there are many errors in the source code...
re.:
In my opinion we start build android from beginning. My problem is in my OS on my PC. I have Windows XP and building and modifing found only on Linux. I find this page with porting guide. It is step by step How to create boot screen, How to setup Connectivity...
source.android.com/porting/bring_up.html
On this page are programs for debug and download android source code...
Anyone write.
Move to general as not rom development
I'm using linux, this is why I want to try to cross-compile a kernel for our device, like I just said, source code has a large number of errors, I don't know why...
if you are interested, I can share the kernel configuration I made myself...
Now I install Ubuntu 10. It was compilation found in this version of Linux??? Where programs can I download? Now I have Git, Eclipse and Python 2.7. How can I install .tar packs on Ubuntu zito882000?
if you are new as a linux user it's quite difficult to explain, you need gcc plus the same programs a normal user has to compile a kernel.
The difference is in the way of compilation, a parameter that does a compilation for arm architectures....do you have some kernel compilation experience?
re.:
zito882000 said:
if you are new as a linux user it's quite difficult to explain, you need gcc plus the same programs a normal user has to compile a kernel.
The difference is in the way of compilation, a parameter that does a compilation for arm architectures....do you have some kernel compilation experience?
Click to expand...
Click to collapse
windows is gold.
with compilation i haven't any experience. I only begin in programming languages C, C++ and VB. I compile only my apps in visual studio. And i have nice experience with photoshop.
it isn't exactly the same thing, in a kernel you have a large number of drivers to compile, not a only one program...
Here cyberciti.biz/tips/compiling-linux-kernel-26.html you can find a simple guide!
The most important part is the command "make" that need some different parameters to do a cross-compilation for ARM processors ^^
thx
I saw the instructions and understand him. If I somehow help you write to my icq: 484038954 or Skype: vasek-smekal.
So far, thanks
I just bought an HTC Hero with native android.
If you want to try again I share with you my kernel configuration file and a link where you can download the kernel source I used.
(remember to rename "config.txt" in ".config" with the point and without the extension)
KERNEL SOURCE -> http://developer.htc.com/ (must choose "HTC Wildfire - Froyo - 2.6.32 kernel source code")
ARM LINUX GCC -> http://www.handhelds.org/download/projects/toolchain/archive/arm-linux-gcc-3.3.1-030820.tar.bz2
Hi,
I want to know how can I make my own ROM using paul's ICS sources or build it from the CM9 sources, which software I need to use and is this tut good for beginning?
www(.)theunlockr(.)com/2010/03/26/how-to-create-your-own-custom-rom-for-android-part-1-setting-up-the-kitchen/?
PS: I also want to add the reason why I don't contact with paul is that I wanted to learn & develop it only for me & mine friends
Ofc. for X8 and on nAa kernel ;3
do you know JAVA atleast?
EDIT: wait, you want only to make the build, or to work on the rom and on the source?
EDIT2: Wrong section btw, you should asked on Q&A's
Java on basic level, I do not know any of it's APIs but I can learn them ( I don't know Android API too )
C/C++ on intermediate level
First build it from source, after successful modify source and compile ROM.
MOD: Please move to Q&A if possible, thanks.
You could read my thread (look at my signature). I wrote all the stuff you need to know of ROM-compiling. There's also a thread about kernel making.
eagleeyetom said:
You could read my thread (look at my signature). I wrote all the stuff you need to know of ROM-compiling. There's also a thread about kernel making.
Click to expand...
Click to collapse
Dzięki
Thanks at all, you got the point. I'll try to compile it using yours tut and post result here And one more thing, developing CM9 for X8 build for which phone i need to base on? And where I can get hmmm... X8 Driver sources? Adreno libs and others?
Right now we don't have sources for X8. You need to port most of libs. You could also paul-xxx's drivers from his github. Good luck If you have some questions PM me, I'll help if I'll be able to.
NeveHanter said:
And one more thing, developing CM9 for X8 build for which phone i need to base on?
Click to expand...
Click to collapse
doixanh based his GingerDX ROM - based on Gingerbread - on the Hero source tree. If I recall correctly I read somewhere that a CM9 port to the HTC Hero exists; that might be your best shot as the phone is about the same specs as the X8.
And as eagleeyetom wrote: You either use paul-xxx's drivers or you reverse engineer the Eclair drivers and write them anew from scratch (if your thought was going into the direction of the kernel) - there's no CM9 port for the X8. Your best option would be to try and find devices having a matching hardware component and porting the drivers from there - but chances are pretty slim that other phones use the same hardware SEMC stuffed into the X8.
---------- Post added at 09:13 PM ---------- Previous post was at 09:03 PM ----------
Update: paul-xxx also maintains a GIT repo with a msm7227 kernel ...
paul-xxx / semc-kernel-msm7227-ics
EDIT: Along with some other interesting repos ...
- android_hardware_qcom_camera
- Xperia-TI-Wlan
- android_device_semc_msm7x27-common
These three at least seem to relate to the X8 "Shakira"
Thanks all for help, now I have some basic workaround with this
And one off topic question
ICS is running on 3.0.3 kernel, yes? So why we don't try to port it for X8 and using old 2.6.xx?
NeveHanter said:
And one off topic question
ICS is running on 3.0.3 kernel, yes? So why we don't try to port it for X8 and using old 2.6.xx?
Click to expand...
Click to collapse
It seems the genuine Google AOSP ICS is running Linux 3.0.8
Porting the Kernel might turn into a huge effort. The ABI of 2.6.29 and 3.0 are not really compatible, so the kernel drivers would need to be ported to the CM9 3.0.x series - in case a simple patching them into the kernel tree and trying to compile bombs out with tons of make errors.
Apart from that - the main problem with ICS on the X8 is that a whole lot of devices can't use a custom kernel as a change in the hardware (devices of 11W29 and newer) prevents boot loader unlock.
We could try to see if the CM9 kernel could be slapped into shape ... I got a Quad-Core Phenom II to tackle that task - if someone wants to help out in the research if some msm7227 / Shakira specific parts would need to be patched into the source tree because they aren't part of it.
EDIT: Even the official CM repo uses Linux 2.6.37.6 as their kernel, and the progress on the FXP Kernel seems to have come to a halt; at least I can't see any new stuff in the -shakira repos.
LG GT-540 has ICS on 2.6.35 kernel. Maybe we could try to port Arc's kernel. Maybe this one? Recommend me some C/C++ books to learn basic stuff
You want this book's in english or you prefer in our native? ;3
eagleeyetom said:
Recommend me some C/C++ books to learn basic stuff
Click to expand...
Click to collapse
This is a rather tricky question ...
If you do as I did simply Google up a C/C++ Reference/Tutorial (i.e. http://www.acm.uiuc.edu/webmonkeys/book/c_guide/ or http://www.cplusplus.com/doc/tutorial/) and get going ... you already got gedit to code up .c files, and gcc is also part of your Linux distro to try and compile your "hello_world.c" You could also Google for Online Classes (in the like of http://www2.its.strath.ac.uk/courses/c/) and pick whatever suits you.
However, if you want to read real books ... look through the offers of Addison Wesley and pick what you think is the best book for you. You could also hit up your closest public library and see what they have in store (may be cheaper than buying in case you don't have much money to spend) - or, in case you study, you may want to look into your University's library.
Of course you could also start off with the usual "C/C++ for Dummies" or "Teach yourself <whatever> in 7|14|21|30 days"
Polish would be awesome ;P
Best, simply writed polish C/C++ tutorial, one of the best www(.)warsztat(.)gd/tutorials.php?x=category&id=18
In adddition you can search for ( it's a big ebook ) Symfonia C++ Grębosza ( Symphony in C++ ), you can find it on chomikuj.pl but if U want I can upload it somewhere for you
And if you will have any problems with C/C++ you can write to my GG number 10037533 or PM me here
Hi,
firstly, i have to say, i didn't found a correct section, but this seems to be the most properly, although i could be a noob. If my posting wasn't correct, i hope you will forgive me & move my post in the right section.
In the next months I'd like to start porting CM11 or/and Android 4.4 to my Xperia J, respectively learn how android system works. In this case i thought it would be helpful, if i learn more about Java, especially because i'm learning C# since one year in school.
Really, I'm not interested in "trivial" things things like how to program a own launcher.
(I'd never done something like that, i'm just not interested in.)
My interestings are deeper, e.g. about the implemention of GPRS (want to remove that without damaging the system), the general system settings(want also to modify something in there), the new permission manager in android 4.4, the interaction with the sim card in CM & the original android & their differences(e.g. my Sim only works in android, not in CM), their code & their connection to each other.
Which parts of Android are written in Java, C & C++? (I know the Kernel is wirtten in C, but thats all)
Can you give me some sources about this?
Have you some suggestions what i could do?
Would something like that here:
http://www.amazon.com/Embedded-Android-Porting-Extending-Customizing/dp/1449308295
be helpful?
Or would be something like that better for my project:
http://www.amazon.com/The-Linux-Programming-Interface-Handbook/dp/1593272200/
http://www.amazon.com/Building-Embedded-Linux-Systems-Yaghmour/dp/0596529686/
?
Thanks in advance.
Edit: This Guide: http://forum.xda-developers.com/showthread.php?t=2620389 is a good source, but im still wondering.