How to display multiline from array list in single TextView?

<TextView
            android:id="@+id/kbpViewTvCustNm"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="4dp"
            android:layout_marginLeft="8dp"
            android:lines="4"
            android:textIsSelectable="false" />

Use a StringBuilder to make your array 1 String and append linebreaks in between the individual Strings like this:

StringBuilder builder = new StringBuilder();
for (String details : list2) {
   builder.append(details + "\n");
}

custName.setText(builder.toString());