Similar to another question:
Android Word-Wrap EditText text
Here’s some example XML code:
<EditText
android:id="@+id/edtInput"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="@string/compose_hint"
android:inputType="textCapSentences|textMultiLine"
android:maxLength="2000"
android:maxLines="4" />