MessageStatusCallBack constructor Null safety

MessageStatusCallBack(
  1. {void onProgress(
    1. int progress
    )?,
  2. void onError(
    1. EMError error
    )?,
  3. VoidCallback? onSuccess,
  4. VoidCallback? onReadAck,
  5. VoidCallback? onDeliveryAck,
  6. VoidCallback? onStatusChanged}
)

Implementation

MessageStatusCallBack({
  this.onProgress,
  this.onError,
  this.onSuccess,
  this.onReadAck,
  this.onDeliveryAck,
  this.onStatusChanged,
});