to-do-list-nothing

Top 10 Techie things I want to achieve in 2012

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I’m not the type of person that gets bored easily, I’ve always got many things to keep me amused, mostly side projects at home. I’m a firm believer, that if you don’t set yourself goals in the first place, then you won’t have anything to fail to achieve, so I’ve set myself a list of targets that I’d like to achieve in 2012 knowing full well I probably won’t get around to them all, but if I can do at least 3, it was worth it.

sms-incoming

SMS text messaging simulation on android

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As part of an application I’m currently developing, I need to be able to interogate incoming SMS messages. Since I’ll be developing against the emulator initially I need a way of sending in SMS messages to the emulator. Fortunately, we can use adb to poke in SMS messages at will, as detailed below.
Ultimately, you’ll need to telnet into your emulator, and you’ll need two things:
  • The port the emulator runs on. To find this out, open up a command window and type :

adb devices

You should see something like this :

How to remove the default grey title bar on android apps

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Fed up of the default title bar on your android applications?

We can get rid of that easy, either use the following in your activities to do it :

requestWindowFeature(Window.FEATURE_NO_TITLE);

Or, the way I prefer, disable it application wide by slipping the following into the AndroidManifest.xml file :

android:theme="@android:style/Theme.NoTitleBar"
Code rage

Automating android application signing and zipaligning with maven

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This is something that has had me tearing my hair out for a few days now, I was pretty much border-line braveheart-ing my screen….

Code rage

I’ve recently been on a little drive to try to maven-ize my projects. All had been going well until I needed to sign and zipalign my APKs. This post will help you conquer that barrier with the use of some maven plugins.

When using ant, I was able to simply enter keystore details into build.properties and just call “ant release”. Unfortunately that approach doesn’t carry across to maven, and you have to provide some more configuration.

String concatenation operator

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The string concatenation operator is a bit like a hedgehog, it looks cute and sweet, but try to grab hold of it quickly and you’ll soon know about it…

It’s actually quite simple, however there are some traps that are very easily overlooked (just got caught out with it on a mock test, so I’m here to rant).

The rule of thumb is, that if either one of the operands being “+” is a String, then concatenation will occur, but if they are both numbers, arithmetic addition will occur. Sounds simple right? What do you think the following equate to?

The instanceof Operator

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The instanceof operator is a great way for checking if a reference variable is of a given type, in other words, does it pass the IS-A inheritance test. Ask yourself, is a Cat a Dog? A Dog a Cat? Or is a Cat an Animal and a Dog an Animal? In true Harry Hill style, there is only one way to decide….FIGHT!!!!

Have a look at my following example :

Compound Assignment Operators

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There are various compound assignment operators, however it is only necessary to know the 4 basic compound assignment operators for the exam, being as follows:

  1. += (Addition compound)
  2. -= (Subtraction compound)
  3. *= (Multiplication compound)
  4. /= (Division compound)

Essentially, they’re just a lazy way for developers to cut down on a few key strokes when typing their assignments. Consider the following examples that I’ve created to demonstrate this:

Static members…

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Statics are a rather strange beast, they belong to no instance of a class, they have no fixed abode, other than their class..

Consider the following example :

Local Variables, as far as the SCJP is concerned

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Local variables are variables that are declared locally, funny that eh? This one should be nice and easy, lets have a look at a quick example :

Other modifiers, for members…

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We’ve already touched upon various modifiers, for classes (both access and non-access), but there are also some more modifiers for members, as detailed here.

We have the following modifiers for members :

  • final - Can’t be overridden
  • abstract - No implementation specified, subclass must implement
  • synchronized - Only a single thread of execution can pass through at a given time
  • native - Implemented by a 3rd party piece of code (C++ for example)
  • strictfp - Enforces foating point precision and doesn’t let the JVM do its own way
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