Using @RunWith(SpringJUnit4ClassRunner.class)

If you use @RunWith(SpringJUnit4ClassRunner.class) in a JUnit test class and it just cannot run, do double check your JUnit version.

It requires JUnit 4.9 or above. 

Leaflet vs ArcGIS JS / FeatureLayer

I'd been deciding ESRI-Leaflet or ArcGIS JS for a small project. Some findings for our references:

When using FeatureLayer for plenty amount of data (e.g. vast amount of points), ArcGIS JS performs better than Leaflet. So even the file size of Leaflet is far smaller than ArcGIS JS, I still have to choose the larger one.

Hope Leaflet FeatureLayer performance can boost up in future.

True Parallel AsyncTask in Android

Multiple AsyncTask execute() actually execute the tasks sequentially. If the previous task takes a long time to run, the next task can only wait till the previous one finish.

To have a true parallel run, use the following instead of AsyncTask.execute():

    AsyncTask.executeOnExecutor(Executor exec, Params... params)

3D translate an element in HTML

To translate the element, you need:

1. A container having CSS style "perspective: ___px"
2. The actual element having CSS style "transform: rotateX(___deg)"

Sample:

<div style="perspective:500px; margin-left:100px;">
    <div style="transform: rotateX(40deg)">
        <table border=1>
            <tr><td>testing</td><td>testing</td><td>testing</td></tr>
            <tr><td>testing</td><td>testing</td><td>testing</td></tr>
            ...
            <tr><td>testing</td><td>testing</td><td>testing</td></tr>
            <tr><td>testing</td><td>testing</td><td>testing</td></tr>
    </table>                
    </div>
</div>

testing	testing	testing	testing	testing
testing	testing	testing	testing	testing
testing	testing	testing	testing	testing
testing	testing	testing	testing	testing
testing	testing	testing	testing	testing
testing	testing	testing	testing	testing
testing	testing	testing	testing	testing
testing	testing	testing	testing	testing
testing	testing	testing	testing	testing
testing	testing	testing	testing	testing

Speed Up the Eclipse IDE

Nice tutorials and references for people who find their Eclipse is kinda slow:

• http://www.nicolasbize.com/blog/7-tips-to-speed-up-eclipse/

Install Teclast X80H (FB6M) as Android USB in Windows

Teclast X80H (FB6M) is a dual OS (Windows 8.1 + Android 4.4.4) tablet, to install

1. Install the Samsung USB driver 
2. Restart the computer
3. Select Device Manager > The X80H device > Update Driver Software.
4. Select Browse my computer for driver software
5. Select Let me pick from a list of device drivers on my computer
6. Select ADB Interface / Android USB Devices from the list
7. Select SAMSUNG Android ADB Interface

http://forum.xda-developers.com/windows-8-rt/general/teclast-x80h-8-dual-os-chinese-tablet-t2996314/post59151938#post59151938

Can Teclast simply provide an adb driver link for customer download easily? ... sigh

JavaScript frameworks that we should get touch with

More and more JavaScript framework to work with:

• React.js
• Ember.js
• Knockout.js
• Backbone.js
• Meteor
• Mithril
• Ember
• Vue.js
• Breeze.js
• Ractive

Reference: http://www.breck-mckye.com/blog/2014/12/the-state-of-javascript-in-2015/

Enable logcat in RedMi / HongMi AOSP 4.2.2

For some reason the logcat in AOSP 4.2.2 maybe disabled by default. To re-enable it, follow the steps below:

1. Extract the file in /system/etc/init.d/03MTKTweakElse
2. Comment out the line "rm /dev/log/main", this statement will disable the logcat to function
3. Push back the file to the device
   C:\> adb push 03MTKTweakElse /system/etc/init.d/03MTKTweakElse

You may not have the privilege to write on the directory /system, to handle this, remount the /system partition using:

1. Enter the shell
      adb shell
2. Change to root
      su
3. Remount the /system as Read-Write
      mount -o remount rw /system

Show multiple lines of title in Android ActionBar

To show multiple lines of title in Android ActionBar, one of the most common solution is to assign some of the text in SubTitle. Here we have another approach:

Basically we get the TextView object of the title in ActionBar, set it's max lines attribute to 2:

int titleId = Resources.getSystem().getIdentifier("action_bar_title","id","android");
TextView title = (TextView) findViewById(titleId);
title.setSingleLine(false);
title.setMaxLines(2);
title.setTextSize(TypedValue.COMPLEX_UNIT_SP, 16);

Then we can set a long title to the ActionBar where the text will be displayed as two lines:

getActionBar().setTitle("... your long title here ...");

ArcGIS: Query for a simplified feature set

To query a simplified feature set using QueryTask, you can set the "MaxAllowableOffset" property through

          com.esri.core.tasks.ags.query.Query.setMaxAllowableOffset( )

or if you're using ArcGIS Android SDK version 10.2.4 already, then it should be:

          com.esri.core.tasks.ags.query.QueryParameters.setMaxAllowableOffset( )