Setting Up An Android App Build Environment With Eclipse, Android SDK, PhoneGap (Debian Squeeze) - Page 2
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4 Integrating The Android SDK Into Eclipse
If you want to use Eclipse to create your Android apps instead of the command line, you need to integrate the Android SDK into Eclipse. To do this, start Eclipse (Applications > Programming > Eclipse):
Click on OK if you see the Workspace Launcher window (you can check the Use this as the default and do not ask again checkbox to not see this message anymore):