Android EditText 实现特殊格式输入

现实中经常遇到要输入特殊格式的字符串，比如MAC地址，IP地址等，可以自动匹配需要的 格式。实现方式是通过EditText.addTextChangedListener(TextWatcher)

TextWatcher实现方式如下：

class MyTextWatcher implements TextWatcher{
private boolean mWasEdited = false;
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {}

@Override
public void afterTextChanged(Editable s) {
if(mWasEdited){
mWasEdited = false;
return;
}
mWasEdited = true;
String newString;
// 根据需求封装字符串

// 替换字符串
s.replace(0,s.length(),newString);
}
}

附上一段我在用的代码，实现MAC格式输入（格式：00-00-00-00-00-00）

class MacTextWatcher implements TextWatcher{
private boolean mWasEdited = false;
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {}

@Override
public void afterTextChanged(Editable s) {
if(mWasEdited){
mWasEdited = false;
return;
}
mWasEdited = true;
String mac = s.toString();
mac = mac.toUpperCase().replace("-","").replace(":","");
StringBuilder builder = new StringBuilder();
for(int i=0;i<mac.length()&&i<12;i++){
builder.append(mac.charAt(i));
if(i%2!=0&&i!=mac.length()-1&&i!=11){
builder.append("-");
}
}
s.replace(0,s.length(),builder.toString());
}
}