To search for a string/text in your Android Studio Project just double tap on the Shift key and a search window will appear that will allow you to search for the string occurrence in all the files anywhere in your project i.e. lets you search in projects, class files, as well as settings.
You can include non-project items by selecting the check-box next to Search Everywhere,

Search in Android Studio
If you only want to search for something in a specific file press Ctrl + Shift + F ( Control + Shift + F on the Mac ) or by the menu : Edit -> Find -> Find to open find a search box.
To find and replace in a file, Menu : Edit -> Find -> Replace
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