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| private EditText mMacEdit = (EditText)findViewById(R.id.edit_mac);
/**
* Registers TextWatcher for MAC EditText field. Automatically adds colons,
* switches the MAC to upper case and handles the cursor position.
*/
private void registerAfterMacTextChangedCallback() {
mMacEdit.addTextChangedListener(new TextWatcher() {
String mPreviousMac = null;
/* (non-Javadoc)
* Does nothing.
* @see android.text.TextWatcher#afterTextChanged(android.text.Editable)
*/
@Override
public void afterTextChanged(Editable arg0) {
}
/* (non-Javadoc)
* Does nothing.
* @see android.text.TextWatcher#beforeTextChanged(java.lang.CharSequence, int, int, int)
*/
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
}
/* (non-Javadoc)
* Formats the MAC address and handles the cursor position.
* @see android.text.TextWatcher#onTextChanged(java.lang.CharSequence, int, int, int)
*/
@SuppressLint("DefaultLocale")
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String enteredMac = mMacEdit.getText().toString().toUpperCase();
String cleanMac = clearNonMacCharacters(enteredMac);
String formattedMac = formatMacAddress(cleanMac);
int selectionStart = mMacEdit.getSelectionStart();
formattedMac = handleColonDeletion(enteredMac, formattedMac, selectionStart);
int lengthDiff = formattedMac.length() - enteredMac.length();
setMacEdit(cleanMac, formattedMac, selectionStart, lengthDiff);
}
/**
* Strips all characters from a string except A-F and 0-9.
* @param mac User input string.
* @return String containing MAC-allowed characters.
*/
private String clearNonMacCharacters(String mac) {
return mac.toString().replaceAll("[^A-Fa-f0-9]", "");
}
/**
* Adds a colon character to an unformatted MAC address after
* every second character (strips full MAC trailing colon)
* @param cleanMac Unformatted MAC address.
* @return Properly formatted MAC address.
*/
private String formatMacAddress(String cleanMac) {
int grouppedCharacters = 0;
String formattedMac = "";
for (int i = 0; i < cleanMac.length(); ++i) {
formattedMac += cleanMac.charAt(i);
++grouppedCharacters;
if (grouppedCharacters == 2) {
formattedMac += ":";
grouppedCharacters = 0;
}
}
// Removes trailing colon for complete MAC address
if (cleanMac.length() == 12)
formattedMac = formattedMac.substring(0, formattedMac.length() - 1);
return formattedMac;
}
/**
* Upon users colon deletion, deletes MAC character preceding deleted colon as well.
* @param enteredMac User input MAC.
* @param formattedMac Formatted MAC address.
* @param selectionStart MAC EditText field cursor position.
* @return Formatted MAC address.
*/
private String handleColonDeletion(String enteredMac, String formattedMac, int selectionStart) {
if (mPreviousMac != null && mPreviousMac.length() > 1) {
int previousColonCount = colonCount(mPreviousMac);
int currentColonCount = colonCount(enteredMac);
if (currentColonCount < previousColonCount) {
formattedMac = formattedMac.substring(0, selectionStart - 1) + formattedMac.substring(selectionStart);
String cleanMac = clearNonMacCharacters(formattedMac);
formattedMac = formatMacAddress(cleanMac);
}
}
return formattedMac;
}
/**
* Gets MAC address current colon count.
* @param formattedMac Formatted MAC address.
* @return Current number of colons in MAC address.
*/
private int colonCount(String formattedMac) {
return formattedMac.replaceAll("[^:]", "").length();
}
/**
* Removes TextChange listener, sets MAC EditText field value,
* sets new cursor position and re-initiates the listener.
* @param cleanMac Clean MAC address.
* @param formattedMac Formatted MAC address.
* @param selectionStart MAC EditText field cursor position.
* @param lengthDiff Formatted/Entered MAC number of characters difference.
*/
private void setMacEdit(String cleanMac, String formattedMac, int selectionStart, int lengthDiff) {
mMacEdit.removeTextChangedListener(this);
if (cleanMac.length() <= 12) {
mMacEdit.setText(formattedMac);
mMacEdit.setSelection(selectionStart + lengthDiff);
mPreviousMac = formattedMac;
} else {
mMacEdit.setText(mPreviousMac);
mMacEdit.setSelection(mPreviousMac.length());
}
mMacEdit.addTextChangedListener(this);
}
});
} |
