android - Adding library project and using it in main project -

I am trying to include and use the project in my app. So I removed it and added it as the Android project module for my main project. Then I added some XML of this category in my project.

  & lt; Com.edmodo.rangebar.RangeBar xmlns: custom = "http://schemas.android.com/apk/res-auto" Android: id = "@ + id / rangebar" Android: layout_width = "match_parent" Android: layout_height = "Wrap_content" />   
 After it launches, it crashes:  
  Reason by: java.lang.ClassNotFoundException: Class not found "com.edmodo. Rangebar.RangeBar "on the path: DexPathList [[ZIP file" /data/app/com.app-1.apk" ],nativeLibraryDirectories=[/data/app-lib/com.app-1, / vendor / lib, / system / lib]]   
 Do I need to define something else?  
 Thank you for helping   
 
 
 First of all, Bar  as a module in your project (if the library provides a jar file, you can also add it to your  libs  folder.)  
 Library What to do to add:  
 
  File  - & gt;  New Module  - & gt;  Import an existing project / Android library  - & gt; And follow the steps to create the module  
 After successfully adding the module, click on your main module and select  Open Module Settings , select your module (main one) And click the  Dependencies  button at the bottom  +  and select  Module dependency , compared to that you will show a pop-up with your built-in module Click and select  OK  Again from  Apply  and  OK .   
 And now you should be able to use that library in your project without any error.