Multi line Edit Text and first letter capitalization of Edit Text

Have you try below code :-

<EditText
    android:id="@+id/commentsEditText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@android:drawable/editbox_background"
    android:inputType="textCapSentences|textMultiLine"
    android:gravity="top"
    android:hint="@string/comments"
    android:lines="5" />

Try to set EditText input type as below :

android:inputType="textCapSentences|textMultiLine"