(Assuming you don't have anything at present, you need to download the following tools: 1. JDK (Java Development Kit), namely jdk-7u4-windows-i586.exe. You can download the latest version from the official website, and there is no problem with older ones. (This article still uses the 6u3 version) 2. Eclipse Classic 3.7.2-win32.zip, which is recommended on the official website and downloaded from the official Eclipse website. 3. ADT, Android development plug-in, the latest version is ADT-18.0.0.zip. 4.AndroidSDK:android-sdk_ R18-windows.zip Maybe installer_ r18-windows.exe。 (This is only a download tool, not a real SDK))