Fix NoSuchMethod exception for HelperSHA256 on API Level prior to P #1117 8000
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PR Checklist
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PR Type
What kind of change does this PR introduce?
What is the current behavior?
On devices running older than Android Pie, an exception will be raised when using Helper.SHA256 method.
What is the new behavior?
Now code has been splitted so newer versions will run curent code, while older ones will run the patched one.
Other information
An instrumented test has been added. I was unable to test it on an emulator. Running the test on my physical Android 8.1 (Oreo MR1) device, it is now working as expected.
To run the instrumented test, open the "tests" view on the Project sidebar tab, an click the "Run" icon on the HelperTest.java on the androidTest folder.