fingerboxes/IPAddressPreference.java

## IPAddressPreference.java
/**
 * EditTextPreference that only allows input of IP Addresses, using the Phone
 * input type, and automatically inserts periods at the earliest appropriate
 * interval.
 */

// Note; this probably isn't the best pattern for this - a Factory of Decorator
// pattern would have made more sense, rather than inheritance. However, this
// pattern is consistent with how other android Widgets are invoked, so I went
// with this to prevent confusion
public class IPAddressPreference extends EditTextPreference {

  public IPAddressPreference(Context context) {
		super(context);

		getEditText().setInputType(InputType.TYPE_CLASS_PHONE);
		getEditText().setFilters(new InputFilter[] { new InputFilter() {
			@Override
			public CharSequence filter(CharSequence source, int start, int end, android.text.Spanned dest, int dstart, int dend) {
				if (end > start) {
					String destTxt = dest.toString();
					String resultingTxt = destTxt.substring(0, dstart) + source.subSequence(start, end) + destTxt.substring(dend);
					if (!resultingTxt.matches("^\\d{1,3}(\\.(\\d{1,3}(\\.(\\d{1,3}(\\.(\\d{1,3})?)?)?)?)?)?")) {
						return "";
					} else {
						String[] splits = resultingTxt.split("\\.");
						for (int i = 0; i < splits.length; i++) {
							if (Integer.valueOf(splits[i]) > 255) {
								return "";
							}
						}
					}
				}
				return null;
			}
		} });

		getEditText().addTextChangedListener(new TextWatcher() {
			boolean deleting = false;
			int lastCount = 0;

			@Override
			public void afterTextChanged(Editable s) {
				if (!deleting) {
					String working = s.toString();
					String[] split = working.split("\\.");
					String string = split[split.length - 1];
					if (string.length() == 3 || string.equalsIgnoreCase("0")
							|| (string.length() == 2 && Character.getNumericValue(string.charAt(0)) > 1)) {
						s.append('.');
						return;
					}
				}
			}

			@Override
			public void onTextChanged(CharSequence s, int start, int before, int count) {
				if (lastCount < count) {
					deleting = false;
				} else {
					deleting = true;
				}
			}

			@Override
			public void beforeTextChanged(CharSequence s, int start, int count, int after) {
				// Nothing happens here
			}
		});
	}
}
	/**
	* EditTextPreference that only allows input of IP Addresses, using the Phone
	* input type, and automatically inserts periods at the earliest appropriate
	* interval.
	*/

	// Note; this probably isn't the best pattern for this - a Factory of Decorator
	// pattern would have made more sense, rather than inheritance. However, this
	// pattern is consistent with how other android Widgets are invoked, so I went
	// with this to prevent confusion
	public class IPAddressPreference extends EditTextPreference {

	public IPAddressPreference(Context context) {
	super(context);

	getEditText().setInputType(InputType.TYPE_CLASS_PHONE);
	getEditText().setFilters(new InputFilter[] { new InputFilter() {
	@Override
	public CharSequence filter(CharSequence source, int start, int end, android.text.Spanned dest, int dstart, int dend) {
	if (end > start) {
	String destTxt = dest.toString();
	String resultingTxt = destTxt.substring(0, dstart) + source.subSequence(start, end) + destTxt.substring(dend);
	if (!resultingTxt.matches("^\\d{1,3}(\\.(\\d{1,3}(\\.(\\d{1,3}(\\.(\\d{1,3})?)?)?)?)?)?")) {
	return "";
	} else {
	String[] splits = resultingTxt.split("\\.");
	for (int i = 0; i < splits.length; i++) {
	if (Integer.valueOf(splits[i]) > 255) {
	return "";
	}
	}
	}
	}
	return null;
	}
	} });

	getEditText().addTextChangedListener(new TextWatcher() {
	boolean deleting = false;
	int lastCount = 0;

	@Override
	public void afterTextChanged(Editable s) {
	if (!deleting) {
	String working = s.toString();
	String[] split = working.split("\\.");
	String string = split[split.length - 1];
	if (string.length() == 3 \|\| string.equalsIgnoreCase("0")
	\|\| (string.length() == 2 && Character.getNumericValue(string.charAt(0)) > 1)) {
	s.append('.');
	return;
	}
	}
	}

	@Override
	public void onTextChanged(CharSequence s, int start, int before, int count) {
	if (lastCount < count) {
	deleting = false;
	} else {
	deleting = true;
	}
	}

	@Override
	public void beforeTextChanged(CharSequence s, int start, int count, int after) {
	// Nothing happens here
	}
	});
	}
	}