@Override
public void beforeTextChanged(CharSequence ss, int start, int count, int after) {
charSequence = ss;
Log.v(
"TextWatcher-beforeTextChanged-->",
" text="
+ ss.toString()
+ " length="
+ ss.length()
+ " start="
+ start
+ " count-"
+ count
+ " after="
+ after);
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String bankId = "";
for (int i = 0; i < s.length(); i++) {
if ((i + 1) % 4 == 0) {
bankId += " ";
}
bankId += s.charAt(i);
}
bankcardnum.setText(bankId);
Log.v(
"TextWatcher-onTextChanged-->",
" text="
+ s.toString()
+ " length="
+ s.length()
+ " start="
+ start
+ " before-"
+ before
+ " count="
+ count);
}
@Override
public void afterTextChanged(Editable s) {
Log.v("TextWatcher-afterTextChanged-->", s.toString() + "length" + s.length());
// 输入的时候，只有一个光标，那么这两个值应该是相等的。。。
editStart = et_user_ban.getSelectionStart();
editEnd = et_user_ban.getSelectionEnd();
// 限定EditText只能输入19个数字，并且达到19个的时候用红色显示
if (charSequence.length() > 19) {
Toast.makeText(AddBankCardActivity.this, "你输入的字数已经超过了限制，不能再输入！", Toast.LENGTH_SHORT)
.show();
// 默认光标在最前端，所以当输入第19个数字的时候，删掉（光标位置从11-1到11）的数字，这样就无法输入超过19个以后的数字
s.delete(editStart - 1, editEnd);
// 当输入超过第19个数字的时候，改变字体颜色为红色
}
}