I had a hard time getting Dagger to work in IntelliJ, so I’m writing down the steps so you will have an easier time at it.

Create a Java project using the usual settings.

Add Dagger2 dependencies to your project

• Open your project’s module settings by right-clicking on your top-level project icon, and selecting Open Module Settings.
• Click on the Dependencies tab.
• Add a runtime dependency:
  • Press the + button.
  • Select the Library… From Maven option.
  • Enter com.google.dagger:dagger: in the search field.
    
  • Select one of the versions (remember this version number)
  • When you return to the dependencies view, select the Runtime scope for the dependency.
• Add a compile-time dependency:
  • Press the + button.
  • Select the Library… From Maven option.
  • Enter com.google.dagger:dagger-compiler: in the search field.
  • Select the same version number as the module you selected above.
  • When you return to the dependencies view, select the Compile scope for the dependency.

Enable annotation processor support in the IDE

• Open the IntelliJ preferences pane.
• Navigate to the Build, Execution, Deployment entry, then Compiler and Annotation Processors.
• Make sure Enable annotation processing is enabled.

Add generated sources to the code completion

• Build your project. If things go well, you should see extra pre-compile tasks that generate code into a generated subdirectory in your output directory.
• Right-click the generated subdirectory, Mark Directory As…, then Sources Root.

And that should get you to building, autocompleting, and running your code with Dagger.

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