Android EditText限制输入字数

//监听输入电话的位数
editTel.addTextChangedListener(new TextWatcher() {
private CharSequence temp;//监听前的文本
private int editStart;//光标开始位置
private int editEnd;//光标结束位置
private final int charMaxNum = 11; //最大文本数
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub

}

@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
temp = s;

}

@Override
public void afterTextChanged(Editable s) {
editStart = editTel.getSelectionStart();
editEnd = editTel.getSelectionEnd() ;
if (temp.length() > charMaxNum) {
Toast.makeText(mApp, "您已经输入了11位电话号码了", 0).show();
s.delete(editStart - 1, editEnd);
int tempSelection = editStart;
editTel.setText(s);
editTel.setSelection(tempSelection);
}

}
});