Replace SparseArray with HashMap to hold JNI instances #857
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With the current implementation the SparseArrays used to hold and manage the Java instances of objects created in JavaScript becomes/is considered 'corrupt' at some point, and would cause an application crash during garbage collection.
Replacing the SparseArray with HashMap of <Integer, Object> appears to prevent those crashes from happening, and although SparseArray is the recommended data structure when memory is a concern in an app - the use of HashMap does not seem to cause any negative effects or a memory overhead when comparing the same application before and after switching to HashMap.
Ideally we want to revert back to using SparseArray to store objects when the original issue in AOSP is addressed and pushed as an update.
Addresses #838