reduce non covered code

move HexDump class from library to example
remove unused UsbSerialRuntimeException

usbSerialExamples/src/main/java/com/hoho/android/usbserial/examples/DeviceListActivity.java

@@ -49,7 +49,6 @@ import android.widget.TwoLineListItem;
 import com.hoho.android.usbserial.driver.UsbSerialDriver;
 import com.hoho.android.usbserial.driver.UsbSerialPort;
 import com.hoho.android.usbserial.driver.UsbSerialProber;
-import com.hoho.android.usbserial.util.HexDump;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -134,9 +133,7 @@ public class DeviceListActivity extends Activity {
                 final UsbSerialDriver driver = port.getDriver();
                 final UsbDevice device = driver.getDevice();
 
-                final String title = String.format("Vendor %s Product %s",
-                        HexDump.toHexString((short) device.getVendorId()),
-                        HexDump.toHexString((short) device.getProductId()));
+                final String title = String.format("Vendor %4X Product %4X", device.getVendorId(), device.getProductId());
                 row.getText1().setText(title);
 
                 final String subtitle = driver.getClass().getSimpleName();

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/UsbSerialRuntimeException.java

@@ -1,46 +0,0 @@
-/*
- * Copyright 2011 Google Inc.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
- * USA.
- */
-
-package com.hoho.android.usbserial.driver;
-
-/**
- * Generic unchecked exception for the usbserial package.
- *
- * @author mike wakerly (opensource@hoho.com)
- */
-@SuppressWarnings("serial")
-public class UsbSerialRuntimeException extends RuntimeException {
-
-    public UsbSerialRuntimeException() {
-        super();
-    }
-
-    public UsbSerialRuntimeException(String detailMessage, Throwable throwable) {
-        super(detailMessage, throwable);
-    }
-
-    public UsbSerialRuntimeException(String detailMessage) {
-        super(detailMessage);
-    }
-
-    public UsbSerialRuntimeException(Throwable throwable) {
-        super(throwable);
-    }
-
-}