How to Fix Dagger 2's 'cannot be provided' Error?

Fixing Dagger 2 Error: "... cannot be provided [...]"

This error occurs when Dagger 2 cannot provide a dependency without an annotated constructor or a method annotated with @Provides. To resolve it:

1. Add an @Inject Constructor

Add an @Inject annotated constructor to the class that is not provided:

class MyDependency {
    @Inject
    MyDependency() { /**/ }
}

Dagger will then use this constructor to create the instance.

2. Create a @Provides Method in a Module

Alternatively, create a method annotated with @Provides in a module that returns the dependency:

@Module
class MyModule {
    @Provides
    MyDependency provideMyDependency() {
        return new MyDependency();
    }
}

Dagger will use this method to create and provide the dependency.

Additional Considerations

• Ensure that the provided dependency is the same type as the requested dependency (i.e., not a superclass or interface).
• Verify that the component provides the dependency (e.g., MyComponent.myDependency()).
• If using interfaces, use @Binds to specify the implementation provided.

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