Question

我有一个listview，想要在这个片段中的每个项目上设置一个onClickListener，但是它不起作用。我也想在listview上设置一个contextMenu，但这也不起作用。

public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    purchasedItemsView = inflater.inflate(R.layout.purchased_items_fragment , container, false);

    db = new StoreDataBase(getActivity() , Consts.StoreDB.DB_NAME , Consts.StoreDB.DB_VERSION);
    storeArrayList = new ArrayList<>();

    listView = (ListView) purchasedItemsView.findViewById(R.id.storeListView);
    adapter  = new StoreListViewAdapter(getContext() , R.layout.store_item_row , storeArrayList);
    listView.setAdapter(adapter);
    adapter .notifyDataSetChanged();

    registerForContextMenu(listView);
    sendData(purchasedItemsView);

    return purchasedItemsView;
}


 private void sendData(View view){

    Bundle bundle = getArguments();
    if (bundle != null) {
        final String[] names = bundle.getStringArray(Constc.Data.names);

        listView = (ListView) view.findViewById(R.id.storeListView);

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

                Log.e("Data" , "clicked");
            }
        });
    }else{

    }
}

Answer 1

在listview完成一次后，

重新初始化onCreateView()。因此，从sendData()方法中删除这一行：

// remove this
listView = (ListView) view.findViewById(R.id.storeListView);

然后，您需要将此部分代码移到if语句之外或onCreateView()方法之内。

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

         Log.e("Data" , "clicked");
    }
});

Answer 2

第1点：看起来你的数组列表是空的，所以填写一些数据

storeArrayList = new ArrayList<>();
//-------------------------------------
Bundle bundle = getArguments();
if (bundle != null) {
    final String[] names = bundle.getStringArray(Constc.Data.names);
    if(names != null && names.length() > 0) {
        storeArrayList.addAll(names);
    }
}
//-------------------------------------
listView = (ListView) purchasedItemsView.findViewById(R.id.storeListView);
adapter  = new StoreListViewAdapter(getContext() , R.layout.store_item_row , storeArrayList);
listView.setAdapter(adapter);

第2点：你不需要“notifyDataSetChanged（）;”在您设置适配器之后。

//adapter .notifyDataSetChanged();

第3点：使用长按监听器显示上下文菜单

listView.setOnItemLongClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemLongClick(AdapterView<?> parent, View view, int position, long id) {

         Log.e("Data" , "long press clicked");
         //show dialog or context menu dialog.
    }
});

第4点：注释sendData方法并直接使用onclick

//sendData(purchasedItemsView);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

         Log.e("Data" , "clicked");
    }
});

希望这会有所帮助。投票 - 如果你喜欢它。

单击片段中列表视图的每个项目都不起作用

2 个答案: