EditText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
            }
            @Override
            public void afterTextChanged(Editable s) {
             // 对输入后的内容进行二次处理              
        }
        });
    

EditText.setTransformationMethod(new ReplacementTransformationMethod() {
                @Override
                protected char[] getOriginal() {
                    char[] originalCharArr = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z' };
                    return originalCharArr;
                }
                @Override
                protected char[] getReplacement() {
                    char[] replacementCharArr = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z' };
                    return replacementCharArr;
                }
            });