Question

我想扩展SearchView类以覆盖onKeyDown（）方法。所以我在我的片段类中进行如下操作：

public class myfragment extends ListFragment{
...
class CustomSearchView extends SearchView{
    public CustomSearchView(Context context) {
        super(context);
    }       

    public CustomSearchView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event){
        Toast.makeText(getActivity(), "onkeydown", Toast.LENGTH_SHORT).show();
        return super.onKeyDown(keyCode, event);
    }
}
...
}

现在我想在片段中使用这个扩展的SearchView。但我不知道该怎么做。由于我使用searchItem.getActionView（）创建了SearchView对象，有什么方法可以将它转换为CustomSearchView对象，以便在我的片段中触发重写的onKeyDown方法？

@Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    ...

            // Retrieves the system search manager service
            final SearchManager searchManager =
                    (SearchManager) getActivity().getSystemService(Context.SEARCH_SERVICE);

            // Retrieves the SearchView from the search menu item
            final SearchView searchView = (SearchView) searchItem.getActionView();

            // Assign searchable info to SearchView
            searchView.setSearchableInfo(
                    searchManager.getSearchableInfo(getActivity().getComponentName()));

            searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
                @Override
                public boolean onQueryTextSubmit(String queryText) {
                    // Nothing needs to happen when the user submits the search string
                    return true;
                }

                @Override
                public boolean onQueryTextChange(String newText) {
                    ...
                }
            });

由于How can I get onBackPressed() while SearchView is activated?

中提到的解决方案，此问题突然出现

Answer 1

您可以转换为自定义SearchView：

final CustomSearchView searchView = (CustomSearchView) searchItem.getActionView();

当您声明SearchView时，您必须在meny xml文件中使用完整的类名声明自己的SearchView。此外，如果您使用支持库，则必须声明http://schemas.android.com/apk/res-auto命名空间：

没有支持库：

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >

<item android:id="@+id/action_search"
      android:title="@string/action_search"
      android:icon="@drawable/action_search"
      android:showAsAction="always|collapseActionView"
      android:actionViewClass="com.xxx.ListFragment.CustomSearchView" />

支持库：

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:yourapp="http://schemas.android.com/apk/res-auto" >

<item android:id="@+id/action_search"
      android:title="@string/action_search"
      android:icon="@drawable/action_search"
      yourapp:showAsAction="always|collapseActionView"
      yourapp:actionViewClass="com.xxx.ListFragment.CustomSearchView" />

如何在片段中使用扩展SearchView

1 个答案: