Android EditText限制输入字数的方法

本文实例讲述了Android EditText限制输入字数的方法。分享给大家供大家参考，具体如下：

//新浪微博字数限制
private static final int WEIBO_CONTENT_LENGTH_LIMITED = 140;
//添加微博内容edittext
mInputEditText.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) {
    }
};

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);
}

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希望本文所述对大家Android程序设计有所帮助。