Eclipse Sebagai IDE Rails

Menyambung post sebelumnya, sekarang saya akan membahas bagaimana Eclipse yang sudah tidak error akan digunakan sebagai editor untuk project Ruby on Rails.

Pada dasarnya mudah sekali untuk melakukannya, tinggal menginstal satu plugin dari Aptana dan Eclipse kita sudah siap untuk mengedit project Ruby on Rails. Dari website Aptana kita menuju bagian download di link ini. Kemudian akan ada pilihan untuk menggunakan Aptana Standalone version atau sebagai plugin dari Eclipse. Karena saya merasa akan menjadi hal yang sia-sia bila harus menggunakan 2 program bila 1 program sebenarnya bisa, maka saya memilih Eclipse Plug-in Version.

Setelah memasukkan nama dan alamat email kemudian mengklik tombol Download Aptana Studia 3, kita akan dibawa ke halaman baru yang menjelaskan mengenai Eclipse Plug-in Installation. Untuk mudahnya saya terjemahkan saja ya.

http://download.aptana.com/studio3/plugin/install

• Dari Help menu di Eclipse pilih Install New Software
• Paste url diatas ke kolom Work With dan tekan enter
• Dari list yang terbentuk, cek pada checkbox untuk plugin Aptana
• Klik next untuk bagian License, tentu saja harus kita Accept kemudian klik tombol Finish
• Kemudian restart Eclipse setelah selesai

Sederhana bukan, setelah merestart Eclipse akan muncul pilihan untuk membuat Project Ruby dan Rails.

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Error Eclipse

Saya betul-betul dalam kebingungan untuk menentukan editor atau IDE apa yang akan saya gunakan dalam development aplikasi. Saya sudah dari dulu mencari IDE untuk Ruby on Rails di Linux, dan akhirnya dari dulu saya kembali memilih Gedit dengan rangkaian pluginnya sebagai editor Rails utama. Sementara untuk Android saya sudah pasti tidak bisa berpindah dari Eclipse, sudah nyaman dan cukup terbiasa dengan interfacenya.

Dari hasil pencarian di Google saya menemukan plugin rails untuk Eclipse dari Aptana, di OS Windows saya menggunakan Aptana Studio sebagai IDE dan cukup suka meskipun berasa sangat berat. Dengan plugin ini saya harap akan mendapatkan kebaikan dari Aptana dengan interface Eclipse.

Saya segera membuka Eclipse saya, dan ternyata saya mengalami error, Eclipse tidak mau terbuka dan mengatakan bahwa sudah menulis log di dalam folder .metadata di workspace. Saya segera menuju file log tersebut dan ternyata error yang muncul di sekitar ObjectNotFoundException dari saran di situs StackOverflow saya kemudian mendelete folder .metadata dengan resiko kehilangan seluruh project saya (bukan file project, hanya settingan project, sehingga project tidak tertampil di Eclipse). Kemudian saya restar Eclipse dan memang Eclipse berjalan kembali, bisa masuk workspace saya yang sekarang tampak kosong tanpa project satupun (—__—).

Tapi belum selesai disitu kemudian muncul error lagi, sekarang di bagian console Eclipse yang menyatakan error berhubungan dengan ADT atau Android plugin. Saya segera browsing lagi dan ternyata memang permasalahan yang umum. Bisa diselesaikan dengan menginstall ulang beberapa lib, katanya error kedua ini muncul karena ADT dibuat untuk sistem 32 bit tapi untungnya Ubuntu bisa mengatur agar program di OS 64bit menggunakan lib untuk 32bit.

    apt-get install lib32ncurses5 lib32stdc++6 #ini yang singkat dan tepat
    apt-get install ia32-libs #ini versi download semua (40libs ~ 240mb)

Untuk mempelajari lebih lanjut mengenai troubleshooting error Eclipse bisa dilihat di link paling bawah dari daftar link yang membantu saya dalam memecahkan masalah ini.

1. http://stackoverflow.com/questions/10005907/eclipse-android-plugin-libncurses-so-5
2. http://askubuntu.com/questions/147400/problems-with-eclipse-and-android-sdk
3. http://stackoverflow.com/questions/3505187/eclipse-galileo-wont-start-error-objectnotfoundexception-tree-element
4. http://www.eclipsezone.com/eclipse/forums/t99010.html

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Android Programming - Setting Up Your Environment

This is my first article of Android Programming Series in my blog. I'll share you how to set up an environment to begin programming in Android. Actually it was easy and the Android Developer site have a full article about this too, but maybe you'll want to read mine, I'll include with several troubleshooting I've found when I first time trying to install this SDK.

Android application made using the Android SDK (Standard Development Kit) and it could use also the NDK (Native Development Kit) that allows you to use a language other than Java (C or C + +), of course it usage for advance programming that really need the efficiency and effectiveness of specific code (socket programming, 3D, high-scale data management).

We can use the interface of Eclipse Java version as an IDE (Integrated Development Environment) with the ADT plugin. Actually, we can also use other Java-based IDE like IntelliJ and NetBeans, but I think most easily with Eclipse because ADT has been good enough in doing the integration, on the other IDE you will still need to generate Eclipse project files as a base in the IDE and then do the programming in another IDE after importing. There also needs  Java Runtime Environment and Java Development Kit to be able to run the program.

Eclipse is a multiplatform IDE, you can use a variety of Linux operating system (Ubuntu recommended), Windows (XP, Vista, 7) and MacOSX from version 10.5.8 (x86).

So before it can begin to make the Android program we should prepare: Eclipse, ADT, Android SDK, JRE, JDK and at least one Android platform to make Android Virtual Devices later.

1. Installing JDK and JRE

Please go to the Java download site. Download the JDK and JRE is the latest if it does not exist on your computer. Please adjust your computer operating system. For Linux it can be downloaded from the repository using your favorite repository management software, there is also an open version JDK.

Note : I bet you found no error in this step, Java installation (both JRE and JDK) is simple (just click the installer) and realy straight forward.

2. Installing Android SDK

Downloaded from the Android Developer site http://developer.android.com. There are also provided the installation guide. For Windows as usual just click on the installer and specify the location where we want to put the Android SDK installation folder, please notice the location of this folder, because it will be used for setting the Eclipse as well. In Linux and Mac I think you can do that in simple command too. I use Ubuntu, so I download the .deb version installer, and it works fine, just click, input the administrator password and installed. I placed the SDK in my home folder (Ubuntu) and C:\Program Files in Windows.

Note : it is easy too, just remember the place of Android SDK folder as a mention before, it's a must.

3. Installing Eclipse

Eclipse can be downloaded from its website http://www.eclipse.org . Eclipse does not need to install, just extract your downloaded achive and Eclipse can be used by running eclipse.exe in it. You will be asked about the workspace, select the location where you want to put your Eclipse workspace, in this folder all Eclipse project files will reside. Check the checkbox at the bottom so that you are not continually asked about the workspace when running Eclipse.

Note : Maybe you'll find some error in this step, check that your Eclipse Download is Java IDE version, because Eclipse has separate and various IDE for other language. Check your OS version, remember that maybe your hardware support 64bit OS (you have AMD 64 sticker :p) but ussualy your OS is not 64 bit edition, so you need to download the 32bit version (for SDK and Eclipse). Eclipse will check for JRE installation too, and maybe other dependency, just fill out other dependency to stop the error.

4. Installing ADT

It will be done through Eclipse, open Eclipse, then to Help >> Install New Software >> Add. Enter Name: ADT, location: https://dl-ssl.google.com/android/eclipse . Then click OK. This can be done when your computer is connected directly to the Internet, otherwise you can download the installation file first Android Developer ADT from the site and then install it from Eclipse by selecting the type Archive in the Add dialog box earlier and go to your ADT installation files.

 After this you must connecting your SDK with Eclipse preferences. Go to Window >> Preferences >> Android and add your SDK folder location.

Note : still remember the SDK folder places?Good. Maybe some error will found in this step, try checking internet connection or redownloading the archive.

5. Installing the Android Platform

After successfully installing the ADT you even have the Android SDK and AVD menu in the Window Manager. Also, you can already see there are options to make the Android project in the File >> New >> Other. But you can not make it, because it does not have the build target and AVD (Android Virtual Machine).

Android Platform installation is done from Window >> Android SDK and AVD Manager. It can also be accessed directly from the Android SDK installation file. Go to the Available Packages, and select at least one Android platform. It also can only be done if you are directly connected to the Internet.

If not, there is a little trick to be able to install it offline Android Platform, SDK is another component of the platform can be retrieved from the xml file link http://dl-ssl.google.com/android/repository/repository.xml . It can be seen in the file name such as android-2.2 and can be downloaded from the address http://dl-ssl.google.com/android/repository/ . To install, copy the files downloaded into a new folder called / temp inside the Android SDK installation folder. Then run the AVD, select the appropriate packages that were downloaded earlier and finish. Emulator can be made. Can also be installed in a way more easy to extract the contents of the zip file directly into a folder earlier platforms. Then you can check on the Installed Package AVD Manager, your platform is already installed there.

 Note : problem that can be found is still about the internet connection, for slow connection I recommended the offline install way.

6. Creating AVD

AVD is made ​​from the Window menu >> the Android SDK and AVD Manager >> Virtual Devices >> New. Specify the name of AVD (preferably containing the version, easy to remember), the build target (I think at least 2.1 or 2.2 for now), size SD Card if you want to use, check to be enabled Snapshot, skins use the built-in first, the hardware does not need to be changed first, and can directly click Create AVD.

 Note : Just fill as it must be, minimal error I think, because ADT and Eclipse is pretty good to check our input.

Yeahh...You have done, you have a setting up development environment to start programming in Android. :)

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Belajar Java ep4 Operator

Operator terdiri dari operator logika dan aritmatika. Untuk yang aritmatika saya kira mudah dipahami, seperti biasa kita gunakan di dunia nyata kok.

Operator Aritmatika	Arti	Operator Relasi	Arti	Operator Logika	Arti
+	Penambahan	==	Sama dengan	&	AND
-	Pengurangan	!=	Tidak sama dengan	|	OR
*	Perkalian	>	Lebih dari	^	XOR
/	Pembagian	<	Kurang dari	||	Short-circuit OR
%	Modulus(sisa pembagian)	>=	Lebih dari sama dengan	&&	Short-circuit AND
++/--	Increment dan decrement (+/- 1)	<=	Kurang dari sama dengan	!	NOT

Cara mudah untuk memahami operasi operator logika adalah dengan program seperti ini :

public class OperatorLogika {       public static void main(String[] args) {             boolean P;             boolean Q;                         P = true; Q = true;             System.out.println("P\tQ\tAND\tOR\tXOR\tNOT");             System.out.println((P) + "\t" + (Q) + "\t" + (P&Q) + "\t" + (P|Q) + "\t" + (P^Q) + "\t" + (!P));             P = true; Q = false;             System.out.println((P) + "\t" + (Q) + "\t" + (P&Q) + "\t" + (P|Q) + "\t" + (P^Q) + "\t" + (!P));             P = false; Q = true;             System.out.println((P) + "\t" + (Q) + "\t" + (P&Q) + "\t" + (P|Q) + "\t" + (P^Q) + "\t" + (!P));             P = false; Q = false;             System.out.println((P) + "\t" + (Q) + "\t" + (P&Q) + "\t" + (P|Q) + "\t" + (P^Q) + "\t" + (!P));       } }

Output yang didapat seharusnya :

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Belajar Java ep3 Data Types dan Variabel

Data Types

Tipe	Arti
Boolean	Nilai true/false
byte	Integer 8-bit (-128 – 127)
char	Karakter
double	Double-precision floating point
Float	Single-precision floating point
Int	Integer (-2147483648 – 2147483647)
Long	Long Integer (-9223372036854775808 – 9223372036854775807)
Short	Short Integer (-32768 -- 32767

Ketikkan kode ini di Class baru dengan nama DataType :

public class DataType {       public static void main(String[] args) {             int bil1 = 1123;             long bil2 = 233456573;             short bil3 = 25777;             char ch = 'C';             double fl1 = 10.6;             boolean boo = true;                         System.out.println("bil1 contains : " + bil1);             System.out.println("bil2 contains : " + bil2);             System.out.println("bil3 contains : " + bil3);             System.out.println("ch contains : " + ch);             System.out.println("fl1 contains : " + fl1);             if(boo) System.out.println("boo contains : " + boo);       } }

Output yang diperoleh akan seperti ini :

                      

Variabel

Deklarasi  variabel dilakukan dengan sintaks : tipe nama-variabel. Juga dapat langsung dilakukan inisialisasi nilai variabel dengan penambahan =.  Dapat juga nilainya di-inisialisasikan dengan dinamis melalui hasil operasi variabel lain bahkan pemanggilan Method.

public class Variabel {       /**        * Percobaan inisialisasi variabel        */       public static void main(String[] args) {             int bil4;             int bil5 = 43; //inisialisasi langsung             bil4 = 2;             System.out.println(bil4 + " dan " + bil5);             int bil6 = bil4 * bil5; //inisialisasi dinamis             System.out.println("Nilai dari bil6: " + bil6);                         /*              *    Hasil running program :              *    2 dan 43              *    Nilai dari bil6: 86              */       } }

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