You can rename the project by right-clicking on the project name int it Project Manager and selecting "Rename" from the context menu.
This will rename the project in Android (as shown in the screenshot above) and also rename the project files, including the .dproj and .dpr files. It will create a new .res file and also create .deployproj and AndroidManifest.template.xml files.
Do not use this option unless you intend to really rename the entire project.
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