Android A method of limiting the number of words to be entered

This article shows an example of how Android can limit the number of words entered. To share with you for your reference, as follows:

// Sina weibo word limit 
private static final int WEIBO_CONTENT_LENGTH_LIMITED = 140;
// Add Twitter content 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();
      //  Remove the listener first, otherwise there will be a stack overflow 
      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);
}

More about Android controls related content interested readers can view the site: Android controls usage summary

I hope this article is helpful to Android program design.