android - 为什么我的 Android SwipeRefreshLayout 不刷新？

Question

我找到了很多关于实现 Android 的 SwipeRefreshLayout 的文章 this being the one I followed ，他们都说这很简单，但我似乎无法让我的工作。我做错了什么？

package myPackage;

public class MyClass extends Fragment {

    private View rootView;
    private DatabaseHelper myDBHelper;
    private Cursor dataCursor;
    private SimpleCursorAdapter mySimpleCursorAdapter;

    private ListView rowOfDataListView;
    private SwipeRefreshLayout mySwipeRefreshLayout;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        rootView = inflater.inflate(R.layout.my_awesome_layout, container, false);
        rowOfDataListView = (ListView) rootView.findViewById(R.id.row_of_data);
        mySwipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.swipe_refresh_container);

        return rootView;
    }

    @Override
    public void onViewCreated(View rootView, Bundle savedInstanceState){
        super.onViewCreated(rootView, savedInstanceState);

        if(getArguments() != null) {
            idNumber = getArguments().getString("id");
        }

        myDBHelper = new DatabaseHelper(getActivity());

        dataCursor = myDBHelper.getDataCursor(idNumber);

        String[] fromColumns = {"column1", "column2", "column3", "column4", "column5", "column6"};
        int[] toViews = {R.id.column1_textview, R.id.column2_textview, R.id.column3_textview, R.id.column4_textview, R.id.column5_textview, R.id.column6_textview};

        mySimpleCursorAdapter = new SimpleCursorAdapter(getActivity(), R.layout.row_of_data_layout, dataCursor, fromColumns, toViews, 0);

        rowOfDataListView.setAdapter(mySimpleCursorAdapter);

        myDBHelper.close();

        mySwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                mySwipeRefreshLayout.setRefreshing(false);
            }
        });
    }
}

我的数据本来显示正确，但是刷新不刷新

Answer 1

我没有看到您在刷新时更新数据的位置。我认为您应该将构建 View 的代码分离到一个新方法中，在您的 onViewCreated 方法中调用它，然后在 onRefresh 中再次调用它。否则，onRefresh 会被触发，但它不会“做”任何事情。

package myPackage;

public class MyClass extends Fragment {

    private View rootView;
    private DatabaseHelper myDBHelper;
    private Cursor dataCursor;
    private SimpleCursorAdapter mySimpleCursorAdapter;

    private ListView rowOfDataListView;
    private SwipeRefreshLayout mySwipeRefreshLayout;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        rootView = inflater.inflate(R.layout.my_awesome_layout, container, false);
        rowOfDataListView = (ListView) rootView.findViewById(R.id.row_of_data);
        mySwipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.swipe_refresh_container);

        return rootView;
    }

    @Override
    public void onViewCreated(View rootView, Bundle savedInstanceState){
        super.onViewCreated(rootView, savedInstanceState);
        methodToBuildTheData();

        mySwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                mySwipeRefreshLayout.setRefreshing(false);
                methodToBuildTheData();
            }
        });
    }

    private void methodToBuildTheData() {
        if(getArguments() != null) {
            idNumber = getArguments().getString("id");
        }

        myDBHelper = new DatabaseHelper(getActivity());

        dataCursor = myDBHelper.getDataCursor(idNumber);

        String[] fromColumns = {"column1", "column2", "column3", "column4", "column5", "column6"};
        int[] toViews = {R.id.column1_textview, R.id.column2_textview, R.id.column3_textview, R.id.column4_textview, R.id.column5_textview, R.id.column6_textview};

        mySimpleCursorAdapter = new SimpleCursorAdapter(getActivity(), R.layout.row_of_data_layout, dataCursor, fromColumns, toViews, 0);

        rowOfDataListView.setAdapter(mySimpleCursorAdapter);

        myDBHelper.close();
    }

}