Follow the steps below correctly.
Previously, you had to have 3 pieces of the component below. You can download it with the links below.
1. Eclipse
2. ADT Plugin, version 20.0
3. SDK
Install Eclipse in a way extract the files into a folder.
Install ADT plugins in eclipse
To connect the Eclipse ADT plugin and SDK needed. You must be connected to the internet.
1. Launch Eclipse, then select help> install new software.
2. Click the add on the right above.
3. Add repository dialog box, enter the Name: ADT and Location: https://dl-ssl.google.com/android/eclipse/.
ADT or select the file that you have downloaded earlier, click Archive and locate the ADT file that you have downloaded it.
4. View Available box software. Check the Developer Tools item and then select Next.
5. On the next screen, you will see a list of tools that will be downloaded more detail. Select Next.
6. You will see the license agreement. Select Accept, and then click Finish.
7. After the installation is complete, restart eclipse.
Download and install SDK package
At this stage, you must be connected to the Internet to update the repository. Here's how:
1. In Eclipse, select Window> Android SDK and AVD manager
2. Wait until the Loading completed.
3. Immediately check the Android 2.3.3/2.2 (Since it is commonly used)
4. Then click Install package.
5. Wait a few moments until the download is complete.
6. If the download fails, you can update it online, but you need to download the required packages before. Then put the packages downloaded earlier in the temp folder in the SDK directory, then restart the SDK.
Or by:
Extract SDK files that you have downloaded earlier.
Go to Window> Preferences> Android, click Browse to locate the SDK folder that you have downloaded.
Click Apply
