Καλησπέρα, το koumpaki ανήκει σε κάποιο fragment σωστά; Αν ναι, τότε πρέπει να του βάλεις onClickListener μέσα στην onCreateView του fragment (γίνεται και σε άλλες μεθόδους του Fragment αλλά εγώ συνήθως εκεί τα κάνω).

Είναι φυσικό να σου σκάει, διότι πας να βρεις view που ανήκει σε layout το οποίο δεν έχει γίνει ακόμα inflated (δεν έχει δημιουργηθεί ας πούμε..)
Πιο συγκεκριμένα, όταν κάνεις findViewbyId μέσα στην onCreate της MainActivity (αφού έχεις καλέσει την setContentView(R.layout.main)), θα πάει να ψάξει τα views που περιέχει το αρχείο main.xml.

Οπότε γίνεται προφανές το πρόβλημα πιστεύω.

Καλή συνέχεια!

Μπορείς να μας δώσεις το σφάλμα που πετάει;

Θέλεις όλα τα κουμπιά να κάνουν το ίδιο πράγμα ή το καθένα διαφορετικό; Γιατί δεν χρησιμοποιείς την onClick property στο layout για το κάθε κουμπί;

Δες εδώ http://developer.android.com/guide/topi ... lingEvents και δοκίμασε την onClick.

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