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1. Right click on your project and select "Open Module Settings".

2. Click the "+" button in the top left corner of window to add a new module.

3. Select "Import .JAR or .AAR Package" and click the "Next" button.

4. Find the AAR file using the ellipsis button "..." beside the "File name" field.

5. Keep the app's module selected and click on the Dependencies pane to add the new module as a dependency.

6. Use the "+" button of the dependencies screen and select "Module dependency".

7. Select the module and click "OK".

EDIT: Module dependency in screenshot 6 has been removed in Android Studio 4.1. As an alternative add the module dependency to the build.gradle.

dependencies { implementation project(':your_module') } 

1. Right click on your project and select "Open Module Settings".

2. Click the "+" button in the top left corner of window to add a new module.

3. Select "Import .JAR or .AAR Package" and click the "Next" button.

4. Find the AAR file using the ellipsis button "..." beside the "File name" field.

5. Keep the app's module selected and click on the Dependencies pane to add the new module as a dependency.

6. Use the "+" button of the dependencies screen and select "Module dependency".

7. Select the module and click "OK".

EDIT: Module dependency in screenshot 6 has been removed in Android Studio 4.1. As an alternative add the module dependency to the build.gradle.

dependencies { implementation project(':your_module') } 

EDIT: The user interface and the work flow have been changed a lot in Android Studio 4.2. The process to add a dependency is very well explained in an official documentation now: Adding dependencies with the Project Structure Dialog

1. Right click on your project and select "Open Module Settings".

2. Click the "+" button in the top left corner of window to add a new module.

3. Select "Import .JAR or .AAR Package" and click the "Next" button.

4. Find the AAR file using the ellipsis button "..." beside the "File name" field.

5. Keep the app's module selected and click on the Dependencies pane to add the new module as a dependency.

6. Use the "+" button of the dependencies screen and select "Module dependency".

7. Select the module and click "OK".

1. Right click on your project and select "Open Module Settings".

2. Click the "+" button in the top left corner of window to add a new module.

3. Select "Import .JAR or .AAR Package" and click the "Next" button.

4. Find the AAR file using the ellipsis button "..." beside the "File name" field.

5. Keep the app's module selected and click on the Dependencies pane to add the new module as a dependency.

6. Use the "+" button of the dependencies screen and select "Module dependency".

7. Select the module and click "OK".

EDIT: Module dependency in screenshot 6 has been removed in Android Studio 4.1. As an alternative add the module dependency to the build.gradle.

dependencies { implementation project(':your_module') } 

1. Right click on your project and choose "Open Module Settings".

2. Click the "+" button in the top left to add a new module.

3. Choose "Import .JAR or .AAR Package" and click the "Next" button.

4. Find the AAR file using the ellipsis button ("...") beside the "File name" field.

5. Keep the app's module selected and click on the Dependencies pane to add the new module as a dependency.

6. Use the "+" button of the dependencies screen and choose "Module dependency".

7. Choose the module and click "OK".

1. Right click on your project and select "Open Module Settings".

2. Click the "+" button in the top left corner of window to add a new module.

3. Select "Import .JAR or .AAR Package" and click the "Next" button.

4. Find the AAR file using the ellipsis button "..." beside the "File name" field.

5. Keep the app's module selected and click on the Dependencies pane to add the new module as a dependency.

6. Use the "+" button of the dependencies screen and select "Module dependency".

7. Select the module and click "OK".