android edittext 点击回车会响应两次的解决方案

由于Key有Down和Up事件，所以会执行两次。

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<code class="hljs axapta">class editTextOnKeyClickListener implements etOnKeyClickListener {         @Override         public boolean onKeyClick(View v, int keyCode, KeyEvent event) {             // TODO Auto-generated method stub             if (keyCode == KeyEvent.KEYCODE_ENTER&& event.getAction() == KeyEvent.ACTION_DOWN) {                 InputMethodManager imm = (InputMethodManager) v.getContext()                         .getSystemService(Context.INPUT_METHOD_SERVICE);                 key = search_edit_text.getText().toString();                 if (imm.isActive()) {                     imm.hideSoftInputFromWindow(v.getApplicationWindowToken(),                             0);                 }                 load_view.setVisibility(View.VISIBLE);                 page = 0;                 SearchBookAsyncTask task = new SearchBookAsyncTask(key,                         load_view, view, myBookList, search_book_adapter, page,                         null, null, 0, list, showList,bg);                 task.execute();             }             return false;         }     }</code>