Java : Arrarys

Arrays in Java are also objects.we use the following syntax:
int[ ] arry; // There is no size

We create new size like below
arry = new int[5]



To show array length
arry.length


To see the array value
int[ ] arry = { 1, 2, 3, 4, 5}
or 
arry[1] = 20;

Here is example code :




public class Demo {
           public static void main(String[ ] args) {
                  int[ ] arry ;
                  arry = new int[5];
                  arry[0] = 33;
                  arry[1] = 34;
                  arry[2] = 35;
                  arry[3] = 36;
                  arry[3] = 37;    
  
                  for ( int i = 0; i < arry.length; i++)
                  {
                         System.out.println(arry[i]);
                  }
 
                  
           }
}

mount samba on ubuntu

sudo mount.cifs //hostname/sharename ~/mounts/sharename -o user=username,pass=password

sshfs on ubuntu

Use sshfs instead, there is no setup necessary at all and you get "proper" mount points that are recognized by any application:

sudo apt-get install sshfs

Mount the remote filesystem with

sshfs user@host:/path /local/mount/point

and unmount with

fusermount -u /local/mount/point

更新git

使用的是ubuntu 10.04,出現這個問題
fatal: git 1.7.2 or later required
git版本太舊
處理的方法如下:
$ sudo add-apt-repository ppa:git-core/ppa
$ sudo apt-get update
$ sudo apt-get install git
就可以更新到新版的git

Android CTS test

step1 :  download tool ;
http://source.android.com/compatibility/cts-intro.html

step2:

Added the below in cts-tradefed

CTS_ROOT=/home/test/projects/cts

CTS/android-cts/tools$ ./cts-tradefed

cts-tf > run cts -c android.permission2.cts.ProtectedBroadcastsTest -m testSendProtectedBroadcasts

tcpdump

Using tcpdump to capture wireless packet

git auto completion

git clone git://git.kernel.org/pub/scm/git/git.git

$cp git/contrib/completion/git-completion.bash ~/.git-completion.bash

　在 .bashrc 中加入：

source ~/.git-completion.bash

 

 

$ git co
config commit

 

Bluetooth Profile

http://www.palowireless.com/infotooth/tutorial/profiles.asp

https://support.google.com/android/bin/answer.py?hl=en&answer=1650159

http://processors.wiki.ti.com/index.php/Android-Adding_Bluetooth_Profile

android JB build error

export SHELL=/bin/bash

Driver: update firmware metho

http://www.makelinux.net/ldd3/chp-14-sect-8
http://www.mjmwired.net/kernel/Documentation/firmware_class/


/sys/class/firmware

#include 
int request_firmware(const struct firmware **fw, char *name,
                     struct device *device);

struct firmware {
        size_t size;
        u8 *data;
};

void release_firmware(struct firmware *fw);

power management : good web site

http://www.thinksrc.com/2011/11/1/debug-android-linux-suspend.html

trick : vi and cscope

     vi

• CTRL-] : 檢索游標所在位置的函式(或變數)，跳到函式本體或變數定義的地方
• CTRL-O : 跳回前一個游標的位置 (Go to older cursor position in jump list)
• CTRL-I : 跳到下一個游標的位置 (Go to newer cursor position in jump list)
• CTRL-N-P : 在 Insert mode 下按住 CTRL，連續輸入 n,p，會出現如下畫面的選單讓我們挑選函式(或變數)
  

    cscope
Ctrl+[ s "s表Symbol，列出所有參考到游標所在字串的地方，包含定義和呼叫。
ctrl+[ g "g表Global，與ctags的Ctrl+]相同。
ctrl+[ c "c表Call，列出所有以游標所在字串當函數名的地方。
ctrl+[ t "t表Text，列出專案中所有出現游標所在字串的地方。
ctrl+[ f "f表File，以游標所在字串當檔名，開啟之。
ctrl+[ i "i表Include，以游標所在字串當檔名，列出所有include此檔的檔案。
ctrl+[ d "d表calleD，以游標所在字串當函式名，列出所有此函式呼叫的函式。

dumpsys tool

Using dumpsys tool to see more information
-#dumpsys [option]
ex: dumpsys power

ubuntu :setup 中文輸入 gcin

1. system -> Admin -> package manager -> gcin
2. Terminal
    $im-switch -s gcin
3. reboot

good git website

http://sixrevisions.com/resources/git-tutorials-beginners/

ubuntu 11.10: change gcc for build android

$sudo apt-get install gcc-4.4 g++-4.4 gcc-4.4-multilib g++-4.4-multilib

$sudo update-alternatives --install \
/usr/bin/gcc gcc /usr/bin/gcc-4.6 60 \
--slave /usr/bin/g++ g++ /usr/bin/g++-4.6
$sudo update-alternatives --install \
/usr/bin/gcc gcc /usr/bin/gcc-4.4 40 \
--slave /usr/bin/g++ g++ /usr/bin/g++-4.4
$sudo update-alternatives --config gcc 

$gcc -v
$g++ -v

linux shell good site

http://www.study-area.org/linux/system/linux_shell.htm

repo:Change branch in existed repo directory

Get code with a manifest in branch ABC:

#cd .repo/manifests

#git pull

#git checkout -b ABC origin/ABC

#cd ../..

#repo sync -d

#repo start NEW_BRANCH --all

android: how to see LOGV message

In your code add  

#define LOG_NDEBUG 0 


The reason is log.h at system/core/include/cutils/log.h

Ex:
In you want to see LOGV in audio_hw.c

You must add


#define LOG_TAG "audio_hw_primary"
#define LOG_NDEBUG 0
#define LOG_NDEBUG_FUNCTION
#ifndef LOG_NDEBUG_FUNCTION
#define LOGFUNC(...) ((void)0)
#else
#define LOGFUNC(...) (LOGV(__VA_ARGS__))
#endif

android: Filter logcat to get only you want message

adb -d logcat your_package_name:log_level *:S

ex: adb -d logcat com.example.example:I *:S



reference:
http://stackoverflow.com/questions/6854127/filter-logcat-to-get-only-the-messages-from-my-application-in-android