EditTextIPAddress.java

package com.hastarin.android.udpsender.ui;

import android.content.Context;
import android.text.Editable;
import android.text.InputFilter;
import android.text.InputType;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.widget.EditText;

public class EditTextIPAddress extends EditText {

	public EditTextIPAddress(Context context) {
		super(context);
		initialize();
	}

	public EditTextIPAddress(Context context, AttributeSet attrs) {

		super(context, attrs);
		initialize();
	}

	public EditTextIPAddress(Context context, AttributeSet attrs, int defStyle) {

		super(context, attrs, defStyle);
		initialize();
	}

    @Override
    public void setInputType(int type)
    {
        super.setInputType(type);
        HandleInputType(type);
    }

    private void HandleInputType(int type)
    {
        switch (type) {
            case InputType.TYPE_CLASS_PHONE:
                setFilters(new InputFilter[] { new InputFilter() {
                    @Override
                    public CharSequence filter(CharSequence source, int start, int end,
                                               android.text.Spanned destination, int dstart, int dend) {
                        if (end > start) {
                            String destinationString= destination.toString();
                            String resultingText = destinationString.substring(0, dstart)
                                    + source.subSequence(start, end)
                                    + destinationString.substring(dend);
                            if (!resultingText
                                    .matches("^\\d{1,3}(\\.(\\d{1,3}(\\.(\\d{1,3}(\\.(\\d{1,3})?)?)?)?)?)?")) {
                                return "";
                            } else {
                                String[] splits = resultingText.split("\\.");
                                for (int i = 0; i < splits.length; i++) {
                                    if (Integer.valueOf(splits[i]) > 255) {
                                        return "";
                                    }
                                }
                            }
                        }
                        return null;
                    }
                } });
                break;
            default:
                setFilters(new InputFilter[]{});
                break;
        }
    }

	private void initialize() {

        HandleInputType(getInputType());

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

			@Override
			public void afterTextChanged(Editable s) {
                boolean check = getInputType() == InputType.TYPE_CLASS_PHONE;
				if (check && !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 && Integer.parseInt(string) > 25))
                            {
						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
			}
		});
	}
}