Android：可从库项目绘制到应用程序

Question

I'm currently creating a payment SDK for android, as such I want to send some images from the sdk/library project to the actual application based on different situations. I want the users of the application to use the drawables, but I dont want them to set it manually(ie get it directly from the SDK's drawable folder), the SDK should automatically choose what image to use based on difference situations.

Currently what I have is a DAO class which when initilized have something like:

case (MASTERCARD):
    this._logo = getResources().getDrawable(R.drawable.mastercard_securecode);

and then in the application I want to be able to fetch that drawable and use it in an ImageView like this:

img.setImageDrawable(DAOObject.getLogo());

However when running this I get

06-15 20:25:18.933: W/dalvikvm(625): VFY: unable to resolve static field 6 (mastercard_securecode) in LPackagePath/R$drawable;

followed by a nullpointer exception as getLogo will return null due to the above error.

Anyone know how to implement this properly so I dont get the above errors and still be able to implement it this way where the application gets the drawable sent dynamically as such?

Any help is much appreciated!

Answer 1

Okay so I figured this out finally.

The problem really was Context. I needed to pass the context from the application into the SDK and then I could get the images properly by doing

context.getResources().getDrawable(R.drawable.mastercard_securecode);

Secondly I needed to import the jar file in a library project and then import the images in that second library project so that the SDK it self is closed source but I still had the ressources available.