Java, step by step

17/06/30
1. Super()
Super in Java
https://stackoverflow.com/questions/3767365/super-in-java
super keyword in Java
https://www.javatpoint.com/super-keyword

2. @Override
What does @Override mean?
https://stackoverflow.com/questions/4341432/what-does-override-mean

17/07/01
3. @SuppressWarnings("")
Since Java 5.0, you can disable compilation warnings relative to a subset 
https://www.ibm.com/support/knowledgecenter/en/SSQ2R2_9.1.0/org.eclipse.jdt.doc.user/tasks/task-suppress_warnings.htm

Notepad++ tips

17/6/29

1. Notepad++ 80 character line maker
https://superuser.com/questions/414209/notepad-80-character-line-marker

2. Notepad++ manually highlight selected text like Microsoft Word does
https://stackoverflow.com/questions/15179057/notepad-manually-highlight-selected-text-like-microsoft-word-does
Set
Settings > Shortcut mapper > Using 1st Style: Ctrl + 1, 2, 3, 4, 5
Clear
Settings > Shortcut mapper > Clear 1st Style: Ctrl + + Shift + 1, 2, 3, 4, 5

R, Count repeated words in a column using R

Count repeated words in a column using R

- table

- as.data.frame(table(...))

Basic power profiling method in the device

1. With Power board (hardware)
 - https://mostly-tech.com/2015/05/31/how-to-power-profile-your-app-using-hardware/
 - http://www.anandtech.com/print/6529/busting-the-x86-power-myth-indepth-clover-trail-power-analysis
2. Clock profiling (software)
 - Application processor is consist of CPU, GPU, BUS, ...
3. With tools (software)
3.1 ARM DS-5 stream line
 - https://developer.arm.com/products/software-development-tools/ds-5-development-studio/streamline
3.2 TOP command (process load)
 - http://www.tecmint.com/12-top-command-examples-in-linux/
 - https://www.lifewire.com/linux-top-command-2201163
3.3 Systrace
 - https://developer.android.com/studio/profile/systrace-commandline.html
 - https://developer.android.com/studio/profile/systrace.html

LTE CDRX and Power consumption

What is the CDRX
CDRX stands for Connected Discontinus Rx (reception).
 - http://www.simpletechpost.com/
 - http://www.sharetechnote.com/html/Handbook_LTE_DRX.html

About Power
Optimize UE Design for Greater Battery Run-Time
 - http://www.keysight.com/upload/cmc_upload/All/Optimize_UE_design_for_greater_battery_run-time_V3.pdf

In the 3G network
 - http://gsmaterminals.github.io/Developer-Guidelines-Public/
   refer to "3.3 Efficient Network Connection Usage"

Benchmark Android vs. iPhone

Powerful

https://daringfireball.net/linked/2016/09/14/geekbench-android-a10
http://bgr.com/2016/09/15/iphone-7-vs-android-benchmarks/

Android OS vs. Android System

Android OS is based on Linux Kernel. It is low level kernel.
Android System is based on Android Platform. It is high level System.


Android System Arcitecture

+- Application Framework
+- Binder IPC Proxies
+- Android System Services (Media Server, System Server)
+- HAL
+- Linux Kernel

Android System controlls hardware with HAL interface. And HAL interface conncted with Linux Kernel. That is Android OS is Linux Kernel (low level kernel), Android System is Android platform.

1. http://forum.xda-developers.com/showpost.php?p=10922010&postcount=3
2. http://android.stackexchange.com/questions/11985/what-is-the-difference-between-the-android-os-and-android-system
3. https://source.android.com/devices/