Android Studio Default new open project is to reopen a window, and the original project window exists, if you open more than one project, there are many windows open at the same time, how to decide how to open the way you want?
1. Set how new items are opened
The first item is the system default, that is, each time you open a new window
The second item indicates that each open item is in the current window
The third item says that each time you open it, you will be asked to open it in the first two ways (recommended)
If you don't want to be prompted, you can select the second item
2. Open a new project
If you have previously opened other projects, click "file-reopen Project", followed by a list of commonly used project names, select one to open, you will see the open options prompt:
"This window" means that the selected item is opened in this screen (the current project will be closed automatically)
"NewWindow" indicates that the selected item will open in a new window (the current project will not be closed)
Android Studio uses Gradle to manage issues such as compilation and dependencies. Your question was a struggle. You can actually associate the Gradle module with the Eclipse Project and include other project in your Settings.gradle, which is equivalent to importing multiple.
Open the project in the same window of Android Studio