自定义输入手机号自动添加分隔符

public class AccountTxtView extends android.support.v7.widget.AppCompatEditText {

private final char CUT = '-';

public AccountTxtView(Context context) {
super(context);
}

public AccountTxtView(Context context, AttributeSet attrs) {
super(context, attrs);
}

public AccountTxtView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}

@Override
protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
if (text == null || text.length() == 0)
return;
StringBuilder sb = new StringBuilder();

for (int i = 0; i < text.length(); i++) {//添加分割符
if (i != 3 && i != 8 && text.charAt(i) == CUT) {
continue;
} else {
sb.append(text.charAt(i));
if ((sb.length() == 4 || sb.length() == 9)
&& sb.charAt(sb.length() - 1) != CUT) {
sb.insert(sb.length() - 1, CUT);
}
}
}
//防止多次设置值
if (!sb.toString().equals(text.toString())) {
int index = start + 1;
if (sb.charAt(start) == CUT) {
if (lengthBefore == 0) {
index++;
} else {
index--;
}
} else {
if (lengthBefore == 1) {
index--;
}
}
setText(sb.toString());
setSelection(index);
}else{//删除时候判断
String line = text.subSequence(text.length() - 1, text.length()).toString();
if (line.equals(String.valueOf(CUT))) {//如果删除碰到‘-’符号，则默认去除
sb.deleteCharAt(text.subSequence(0, text.length() - 1).length());
setText(sb.toString());
setSelection(sb.length());
}
}
}

public String getPhone() {
String result = null;
String val = getText().toString();
if (val == null || val.isEmpty())
return "";
result = val.replace(String.valueOf(CUT), "");
return result;
}
}