1.Maven setup

Maven setup

2.Spark for REST APIs: Using Spark, Lombok and Jackson to reduce Java boilerplate

http://sparkjava.com/tutorials/sql2o-database

3.connect the spark to the sql

http://sparkjava.com/tutorials/sql2o-database

View Pagger without Fragments

https://www.bignerdranch.com/blog/viewpager-without-fragments/

Android how to parse the XML

XML Content

/*
<car>
<vacancyinfo capacity="327" vacancy="145"/>
</car>*/

parse Program

xml = connection(SharedUtils.CAR_VACANCY_URL, null);

InputStream inputStream = new    ByteArrayInputStream(xml.getBytes());

DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();

DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();

Document doc = dBuilder.parse(inputStream);

doc.getDocumentElement().normalize();

NodeList vacancyinfoNodeLis = doc.getElementsByTagName("vacancyinfo");

Element vacancyinfo = (Element) vacancyinfoNodeLis.item(0);

String capacity=vacancyinfo.getAttribute("capacity");

String vacancy=vacancyinfo.getAttribute("vacancy");

svn

use as git
see:http://johnwong.github.io/mobile/2015/04/30/using-git-with-svn.html

用Git的方式使用SVN

Mobile | • Apr 30, 2015

习惯用Git后的程序员一定对SVN不屑一顾。不过目前的开发环境必须使用SVN，用起来不开心。还好Git提供了对SVN的支持，让我们可以像使用Git一样使用SVN。当然一些Git的高级功能还是无法支持的。

有兴趣详细了解的同学可以参考git-svn文档。简单来说只需要几步就可以使用了。

检出SVN库

git svn clone http://PATH_TO_SVN

有了这一步就可以在命令行像操作Git一样操作SVN了。如果对git-svn的命令不习惯，可以试试用工具。

使用SourceTree

我经常使用的Git客户端是SourceTree。SourceTree支持git-svn，只需要将检出的目录拖到SourceTree的Repository Browser (Command + B)，就可以使用了。

如果使用时遇到错误：

Can’t locate SVN/Core.pm in @INC (you may need to install the SVN::Core module)

解决方法是参考这里：

sudo ln -s /Applications/Xcode.app/Contents/Developer/Library/Perl/5.18/darwin-thread-multi-2level/SVN /System/Library/Perl/Extras/5.18/SVN
sudo ln -s /Applications/Xcode.app/Contents/Developer/Library/Perl/5.18/darwin-thread-multi-2level/auto/SVN/ /System/Library/Perl/Extras/5.18/auto/SVN

然后就可以开心地继续开发了。

自定义Action

使用过程中，因为我有一些改动不需要提交到svn上，所以每次提交或者更新时都需要先stash，完成操作再放回来。这样3步操作可以通过Source Tree的自定义Action合成一步。

定义了一些脚本pull.sh和push.sh，例如：

#!/bin/sh
cd "$REPO"
git stash
git svn fetch
git svn rebase
git stash apply

#!/bin/sh
cd "$REPO"
git stash
git svn dcommit
git stash apply

打开Source Tree的Preferences->Custom Actions，新建pull与push，选择这两个脚本。以后打开项目后，就可以在Actions->Custom Actions下找到你添加的这两个Action。

if not work

try

Git svn not work

https://gist.github.com/markjaquith/7029068

Or try this

svn checkout --username roy.leung --password ro436NG svn://svn.gravitas.com.hk/opt/svnrepos/Android/YOHOMall

android move a view

 float wechatIconX = ivWechat.getX();
        int weChatIconWidth = ivWechat.getWidth();
        float wechatIconCenterX = wechatIconX + weChatIconWidth / 2;
        float popupWidthPX = getResources().getDimension(R.dimen.wechatPopUp_width);
        ivWechatPopUp.setX(wechatIconCenterX - popupWidthPX / 2);

Load dimension value from res/values/dimension.xml from source code

In my dimens.xml I have

<dimen name="test">48dp</dimen>
In code If I do

int valueInPixels = (int) getResources().getDimension(R.dimen.test)
this will return 72 which as docs state is multiplied by density of current phone (48dp x 1.5 in my case)

exactly as docs state :

Retrieve a dimensional for a particular resource ID. Unit conversions are based on the current DisplayMetrics associated with the resources.
so if you want exact dp value just as in xml just divide it with DisplayMetrics density

int dp = (int) (getResources().getDimension(R.dimen.test) / getResources().getDisplayMetrics().density)




viewpager without Fragment

https://www.bignerdranch.com/blog/viewpager-without-fragments/