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Modificar TextView dinamicamente

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Gostaria que me explicassem como atualizar uma TextView no AndroidStudio, com o e-mail de um utilizador que se encontra ativo, estou a usar Firebase.

Já tentei o seguinte:



	currentUser = mAuth.getCurrentUser();
	TextView textView = findViewById(R.id.textView_User);
	textView.setText(currentUser.getEmail()); <--- Dá sempre erro e não consigo perceber como resolver.


Obrigado desde já e cumprimentos.

Edited by edub13



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