Mastering Firebase for Android Development

Handling common errors

As a developer, we come across so many cases where errors occur. Storage offers UploadTask and FileDownloadTask, which can listen to the failures through onFailure listeners. 

By writing our own custom FailureListener, we can handle the errors in a much better way. For example, consider the following class:

class AppFailureListener implements OnFailureListener {  @Override  public void onFailure(@NonNull Exception exception) {    int errorCode = ((StorageException) exception).getErrorCode();    String errorMessage = exception.getMessage();  }}

This code returns an error message, which is the point of common error scenarios:

Code	Reason
ERROR_UNKNOWN	When an unknown error occurred
ERROR_OBJECT_NOT_FOUND	When ...