Used to indicate the result of encoding/decoding. There are four types of results:

1. UNDERFLOW indicates that all input has been processed but more input is required. It is represented by the unique object CoderResult.UNDERFLOW.
2. OVERFLOW indicates an insufficient output buffer size. It is represented by the unique object CoderResult.OVERFLOW.
3. A malformed-input error indicates that an unrecognizable sequence of input units has been encountered. Get an instance of this type of result by calling CoderResult.malformedForLength(int) with the length of the malformed-input.
4. An unmappable-character error indicates that a sequence of input units can not be mapped to the output charset. Get an instance of this type of result by calling CoderResult.unmappableForLength(int) with the input sequence size indicating the identity of the unmappable character.

[Android Documentation]