Android Java source java files opens as png files something

Question

Today Android Studio started to behave strange. Source java files opens as png files something. I can build and run the app and if I look in the file system the java files looks

Answer 1

Another way to solve this:

Close Android Studio and delete the caches folder:

C:\Users\user_name\.AndroidStudio4.0\system\caches

Answer 2

I found a solution that worked for me. I hade to open every java source file and all xml files into a text editor(Notepad++) and change something then save the file back to origin.

Now Android Studio detect all files as normal

Answer 3

When you save a file at notepad and open it in Android Studio, it will happen because notepad use a different encoding (ANSI).

You can set your project file encodings at Settings->Editor->File Encodings

You can also edit a unique file encoding at File->File Encoding

Make sure your project file encoding is UTF-8 (default)

Another important setting is File Types that you can take a look too. Here is mine .java file setting to you as example.