I'm having some trouble adding OpenCV to a new Android project

Question

I have made modifications to several example OpenCV projects within Android, however I am having some issues with using OpenCV successfully in a new Android project.

The documentation on using OpenCV with Android says to complete the following steps to add OpenCV to an Android project -

• ensure the Android project is in the same workspace as OpenCV
• add a reference to the OpenCV project by going to Properties > Android > Library > Add and choosing the OpenCV Library project

I have followed both of these steps, however when I compile my application I receive the console error -

Could not find OpenCV-2.3.1.apk!

Answer 1

When creating a new Android project, the only thing you need to do is

• add a reference to the OpenCV project by going to Properties > Android > Library > Add and choosing the OpenCV Library project

You should not then explicitly add OpenCV Library project into your new Android project's build path:

• add another reference to the OpenCV project by going to Properties > Java Build Path > Projects > add...

If you do latter step, you will get the exact error Could not find OpenCV-2.3.1.apk! described in the question.

Check out the New Android project's build path and remove OpenCV project if it exists, then give it another try and see if this helps.

Answer 2

When you add OpenCV from Properties->Android->libarary->Add you need to leave "Is Library" checkbox unchecked. Go to Project->Properties->Android and uncheck "Is Library" and then try again. It should solve your issue (it did for me) but if it doesn't please take a look at the answers of this question as other people have found some other things to be helpful as well.