Edittext文本更改和操作栏

Question

我有textview如果此textview中有任何文字，我想将搜索按钮添加到操作栏

任何想法如何实现，我添加了如下的监听器

private TextWatcher textWatcher = new TextWatcher() {

              public void afterTextChanged(Editable s) {
              }

              public void beforeTextChanged(CharSequence s, int start, int count, int after) {
              }

              public void onTextChanged(CharSequence s, int start, int before,
                      int count) {

                  invalidateOptionsMenu();

              }
            };
            @Override
            public boolean onPrepareOptionsMenu(Menu menu) {

                if(seachEditText.getText().toString().length() > 0){
                     // add the search button to action bar
                }
                else{
                    // remove the search button to action bar
                }

                return super.onPrepareOptionsMenu(menu);
            }

如何动态添加删除搜索按钮到操作栏