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I keep getting a message popping up in Android Studio whenever I edit a file. It says, "This file is indented with tabs instead of 4 spaces." I can click "OK" or "Indent with 4 spaces" and I know there are ways to change to tabs (see this question), but it is a little annoying to have this message pop up all the time. I even tried clicking "Show Settings" and then "Use tab character" but I still got the message popping up.
Why does it always come up? What can I do about it?
Note: My Java project was imported from Eclipse.
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In the lower-right of the status bar you should see an indicator saying "Tab Size." Click the label to toggle to spaces. To change the amount of indent, click the number next to it and type a new value.
Answer. In most code editors, tabs are not the same as 2 spaces or 4 spaces by default. A tab is stored differently than spaces in the code. Tabs can be seen as a big “jump” in the text, while spaces are always 1 space each.
If you're using IDLE, you can use Ctrl+] to indent and Ctrl+[ to unindent.
The JetBrains IntelliJ IDEA Blog states:
If you’ve already tried the latest IntellIJ IDEA 14 EAP build, you might’ve noticed that the Code Style settings offers a new option: Detect and use existing file indents for editing (enabled by default.)
This new option lets IntelliJ IDEA detect certain Code Style settings (such as Use Tab character and Indent size) in the currently edited file on the fly. It means that even if a file has a code style different from your current settings, they will still be preserved.
So now you don’t need to worry about losing the formatting in files that are specific to certain files in your project that differ from the others.
You can see that option checked in the following image:
The project you imported from Eclipse used tabs rather than spaces for indenting. Android Studio allows you to keep this code style. However, if you don't want the reminders, you can do one of the following things:
Any of the following will work:
Uncheck the Detect and use existing file indents for editing setting.
Change your default indenting for Java (not just on the general Code Style page). Go to File > Settings > Editor > Code Style > Java. On the Tabs and Indents tab click "Use tab character".
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