的EditText让独特的字母 [英] EditText to allow unique letters

问题描述

如何使EditText上应该得到独特的字母输入。

how to make edittext should get unique letters as input.

如果已经封信是那里的EditText上，我们应该进行过滤

if already letter is there in the edittext we should filter it

先谢谢了。

推荐答案

请尝试使用 TextWatcher 的过滤字符由用户输入

try using TextWatcher to filter chars input by user

   TextWatcher mTextWatcher = new TextWatcher() {
        private CharSequence temp;

        @Override
        public void beforeTextChanged(CharSequence s, int arg1, int arg2,
                int arg3) {
            temp = s;
        }

        @Override
        public void onTextChanged(CharSequence s, int arg1, int arg2,
                int arg3) {

        }

        @Override
        public void afterTextChanged(Editable s) {

                   //CHECK HERE FOR UNIQUE LETTERS as INPUT BY USER and REMOVE IT
            }
        }
    };

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