Question

就像在标题中描述的那样，我尝试在片段中使用OnItemClickListener（它不会扩展ListFragment，它只是一个片段）但是监听器似乎没有响应。

它是如何工作的：我创建了一个Fragment，其中包含一个带有自定义ListViewItem的ListView，内容从mysql表中下载，其中一个名为Downloader的类连接到PHP文件，一个名为Parser的类将给定的JSON结果转换为字符串。有一个CustomAdapter，它接收结果并使用Parser的结果更改自定义ListViewItem的TextView。

创建ListView没有问题，显示内容。 片段代码：

public class BiologyFragment extends Fragment implements SwipeRefreshLayout.OnRefreshListener {


String url = "URL FOR PHP - just cut that out :D";
private SwipeRefreshLayout ll;
private ListView lv;
private boolean isRefreshing;
private Handler refreshhandler = new Handler();

public BiologyFragment() {
    // Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    ll = (SwipeRefreshLayout)inflater.inflate(R.layout.fragment_biology, container, false);

    //set up listener for pull to refresh
    ll.setOnRefreshListener(this);

    //Listview for the to be populated
    lv = (ListView) ll.findViewById(R.id.lv);

    //download on opening
    new Downloader(getContext(), url, lv).execute();

    //PROBLEM HERE !
    lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            Toast.makeText(getContext(), "CLICKED " + position, Toast.LENGTH_SHORT).show();
        }
    });

    lv.setOnScrollListener(new AbsListView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(AbsListView view, int scrollState) {
        }

        @Override
        public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
            boolean enable = false;

            if (lv != null && lv.getChildCount() > 0) {
                // check if the first item of the list is visible
                boolean firstItemVisible = lv.getFirstVisiblePosition() == 0;
                // check if the top of the first item is visible
                boolean topOfFirstItemVisible = lv.getChildAt(0).getTop() == 0;
                // enabling or disabling the refresh layout
                enable = firstItemVisible && topOfFirstItemVisible;
            }
            ll.setEnabled(enable);
        }

    });

    return ll;
}

@Override
public void onRefresh() {
    new Downloader(getContext(), url, lv).execute();
    refreshhandler.post(refreshing);
}

Runnable refreshing = new Runnable() {
    @Override
    public void run() {
        if(isRefreshing){
            // re run the verification after 1 second
        }else{
            // stop the animation after the data is fully loaded
            ll.setRefreshing(false);
        }
    }
};


}

片段的XML：

<FrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:descendantFocusability="blocksDescendants">

    <ListView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/lv"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentTop="false"
        />



    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:src="@drawable/ic_menu_slideshow" />

</FrameLayout>

如果您需要ListViewItem XML或CustomAdapter，Downloader或Parser Class只是让我知道，我会在这里发布，我只是不确定是否有必要解决这个问题。

感谢您的关注！

Answer 1

你不应将你的根转换为SwipeRefreshLayout所以不要使用：

 ll = (SwipeRefreshLayout)inflater.inflate(R.layout.fragment_biology, container, false);

使用：

View rootView = inflater.inflate(R.layout.fragment_biology, container, false);
lv = (ListView) rootView.findViewById(R.id.lv);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            Toast.makeText(getContext(), "CLICKED " + position, Toast.LENGTH_SHORT).show();
        }
    });

另外，您没有正确使用SweapRefreshLayout，建议您这样做：

<!-- rest of layout -->

<android.support.v4.widget.SwipeRefreshLayout 
    android:id="@+id/swipe_refresh_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <ListView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/listView">

    </ListView>

</android.support.v4.widget.SwipeRefreshLayout>

<!-- rest of layout-->

Fragment with CustomAdapter中的OnItemClickListener不起作用

1 个答案: