textWatcher = new TextChangeWatcher();etQuerryInfo.addTextChangedListener(textWatcher);/**     * 文字改变类，文字改变时的监听     */    private class TextChangeWatcher implements TextWatcher{        @Override        public void onTextChanged(CharSequence s, int start, int before, int count) {            rlQuerryInfo.setVisibility(View.VISIBLE);            tvQuerryKey.setText(etQuerryInfo.getText().toString());        }        @Override        public void beforeTextChanged(CharSequence s, int start, int count, int after) {        }        @Override        public void afterTextChanged(Editable s) {        }    }

实现TextWatcher三个方法即可onTextChanged，beforeTextChanged，afterTextChanged