修改了interface的名字

src/DateTimePickerDialog.java

@@ -35,7 +35,7 @@ public class DateTimePickerDialog extends AlertDialog implements OnClickListener
     private OnDateTimeSetListener mOnDateTimeSetListener;
     private DateTimePicker mDateTimePicker;
 
-    public interface onDateTimeSetListener {
+    public interface OnDateTimeSetListener {
         void onDateTimeSet(AlertDialog dialog, long date);
     }