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 * ，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);
}

希望本文所述对大家Android程序设计有所帮助。