I saw lots of questions about this topic, but I've found anything that solve my problem. I saw different solutions:
But no one has worked. Here's a sample of my code:
<EditText
android:id="@+id/edtNotesText"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@+id/layoutNotesEditMenu"
android:gravity="left|top"
android:hint="@string/edt_text_notes_add_hint"
android:inputType="textFilter|textMultiLine|textNoSuggestions"
android:padding="6dp"
android:scrollbars="vertical"
android:textColor="@color/lightGrey"
android:textSize="20sp" />
I've find out the problem: I forgot the instruction "setContentView"! Might be trivial but maybe could help someone else.