Android Studio : unmappable character for encoding UTF-8

I had the same problem because there was files with windows-1251 encoding and Cyrillic comments. In Android Studio which is based on IntelliJ IDEA you can solve it in two ways:

a) convert file encoding to UTF-8 or

b) set the right file encoding in your build.gradle script:

android {
    ...
    compileOptions.encoding = 'windows-1251' // write your encoding here
    ...

To convert file encoding use the menu at the bottom right corner of IDE. Select right file encoding first -> press Reload -> select UTF-8 -> press Convert.

Also read this Use the UTF-8, Luke! File Encodings in IntelliJ IDEA

Adding the following to build.gradle solves the problem :

android {
 ...
compileOptions.encoding = 'ISO-8859-1'
 }

1/ Convert the file encoding
File -> Settings -> Editor -> File encodings -> set UTF-8 for

• IDE Encoding
• Project Encoding
• Default encoding propertie file

Press OK

2/ Rebuild Project

Build -> Rebuild project

I have the problem with encoding in javadoc generated by intellij idea. The solution is to add

-encoding UTF-8 -docencoding utf-8 -charset utf-8

into command line arguments!

UPDATE: more information about compilation Javadoc in Intellij IDEA see in my post