init
Initialise the decoder. When possible, initial setup work once in this method. This method must return the dimensions of the image. The URI can be in one of the following formats: File: file:///scard/picture.jpg Asset: file:///android_asset/picture.png Resource: android.resource://com.example.app/drawable/picture
Return
Dimensions of the image.
Parameters
context
Application context. A reference may be held, but must be cleared on recycle.
uri
URI of the image.
Throws
Exception
if initialisation fails.