Bulid Android developing environment

Android is developed by Java. So the first step is you must install JDK(5or6). I'll separate three steps to show you how to install it.

Step1 : Install Java JDK/JRE
Download URL : http://java.sun.com/javase/downloads/index.jsp
1. Please download Java SE Development Kit (JDK)
2. Install the JDk(5/6)
If you want know more detail informantion about install JDK and JRE, you can reference this book Android: a programmer's guide, pelase read chapter 2 of this book.

Step2 : Get the latest Anroid SDK
Download URL : http://developer.android.com/sdk/index.html
You can get the installing info from Android official website http://developer.android.com/sdk/installing.html
If you click SDK Setup.exe, and install failure. You can click the left side "Settings" and uncheck the "force https://...Source.." and redo the available package and reinstall again. After you finish the setup. You can create a AVD(Android virtual device) and use Emulator.exe to run android on you computer.
The detail info please link to http://developer.android.com/guide/developing/tools/emulator.html

Step3 : Install the Java Develop tool (Eclipse)
Download URL : http://www.eclipse.org/downloads/
After you download the IDE Eclipse, please install the Android Plugin to Eclipse.
Please reference http://developer.android.com/sdk/eclipse-adt.html#installing

If you done these steps. You can start your Hello World http://developer.android.com/guide/tutorials/hello-world.html