Android EditText限制输入字数的方法

//新浪微博字数限制private static final int WEIBO_CONTENT_LENGTH_LIMITED = 140;//添加微博内容edittextmInputEditText.addTextChangedListener(mTextWatcher);private TextWatcher mTextWatcher = new TextWatcher() {    private int editStart;    private int editEnd;    public void afterTextChanged(Editable s) {      editStart = mInputEditText.getSelectionStart();      editEnd = mInputEditText.getSelectionEnd();      // 先去掉监听器，否则会出现栈溢出      mInputEditText.removeTextChangedListener(mTextWatcher);      while (mInputEditText.getText().toString().length() > WEIBO_CONTENT_LENGTH_LIMITED) {        s.delete(editStart - 1, editEnd);        editStart--;        editEnd--;      }      mInputEditText.setText(s);      mInputEditText.setSelection(editStart);      mInputEditText.addTextChangedListener(mTextWatcher);      setPromptContent();    }    public void beforeTextChanged(CharSequence s, int start, int count, int after) {    }    public void onTextChanged(CharSequence s, int start, int before, int count) {    }};/*** refresh prompt content numbers*/private void setPromptContent() {  int contentLength = mInputEditText.getText().toString().length();  mInputEditText.setSelection(contentLength);  int limitedLength = WEIBO_CONTENT_LENGTH_LIMITED - contentLength;  String prefix = getResources().getString(R.string.weibo_content_numbers_prefix);    String suffix = getResources().getString(R.string.weibo_content_numbers_suffix);    String promptContentNumbers = prefix + limitedLength + suffix;    SpannableStringBuilder style = new SpannableStringBuilder(promptContentNumbers);    style.setSpan(new ForegroundColorSpan(Color.RED), prefix.length(), promptContentNumbers.length() - suffix.length(),        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);    mPromptContentNumbers.setText(style);}