Classes using fields from compileSdk > Platform Sdk on device cause crash when extended in TS

[petekanev]

Instantiating, or causing the instantiation of a class that extends another native (Android) class in TypeScript can cause a crash if the class being extended exposes public members not present on the device that runs the application.

Suppose we extend a class that introduces a new static member with Platform SDK 24, then compile the application with compileSdk 24/25, and finally install the application on a device running on API Level 23. If we attempt to create an instance of our custom class the application will crash.

Android:

class AccessibilityService {
   ...
   static int GLOBAL_ACTION_TOGGLE_SPLIT_SCREEN = 7; // available with SDK 24+
   ...
}

TypeScript:

declare class MyAccessibilityService extends AccessibilityService { ... }

The ts_helpers script will iterate through all public properties of the class being extended, some of which may not be available on the device that runs the app, (when extending a native class) thus causing the crash.

As a workaround we may add an explicit check to make sure that the traversed fields are not specific to the android Sdk

[alexrainman]

@Pip3r4o installing android@next solved my problem 👍