嗨,我有一个标签式活动,在第一个标签中,我从服务器获取数据并在卡片视图中的Recyclerview中显示.要从服务器获取数据,我使用排球库.我想实现Pull to refresh来加载数据(所以每当我拉它就必须向网络发出请求).我还希望每当我在标签之间切换时禁用网络请求(因为当我在我的应用程序中更改标签焦点时它开始获取数据)我只想做一次网络请求(当用户第一次登录时)然后其他人请求仅通过拉动刷新.
这是我的片段,我在这里回收并查看数据:
public class Tab1History extends Fragment
{
private RecyclerView recyclerView;
private CespiteAdapter adapter;
UserSessionManager session;
private static final String URL_DATA = "http://mydata.php";
private List<CespiteOgg> cespiteOggList;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View rootView = inflater.inflate(R.layout.tab1history, container, false);
recyclerView = (RecyclerView) rootView.findViewById(R.id.my_recycler_view);
recyclerView.setHasFixedSize(true);//every item of the RecyclerView has a fix size
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
cespiteOggList = new ArrayList<>();
loadRecyclerViewData();
return rootView;
}
private void loadRecyclerViewData()
{
// Session class instance
session = new UserSessionManager(getActivity());
//get …Run Code Online (Sandbox Code Playgroud) android android-fragments pull-to-refresh android-volley android-cardview
我正在实现一个与在C中使用动态分配相关的程序.
在Visual Studio 2017和其他IDE(Dev C++,Codeblocks等)上测试同一段代码我有不同的行为:
size_t newDim = 9;
char *p = malloc((newDim + 1) * sizeof(char));
p[newDim] = '\0';
printf("%d\n", strlen(p));
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Visual Studio上printf()的输出是:9
其他IDE:3有时候4.
但是当我用dim-1字符填充数组时,相同的printf()会在其他IDE上生成正确的输出.我认为不同的编译器有不同的管理分配内存的方法,有人可以更详细地解释问题吗?
谢谢
我有一个选项卡式活动,我想在第一个片段(Tab1History)中显示 Recyclerview 和 Cardview。我为 CardView 创建了一个 XML 文件,并在 XML 片段中插入了 Recyclerview。我还创建了适配器:
public class CespiteAdapter extends RecyclerView.Adapter<CespiteAdapter.ViewHolder>
{
private List<CespiteOgg> cespiteOggList;
private Context context;
public CespiteAdapter(List<CespiteOgg> cespiteOggList, Context context) {
this.cespiteOggList = cespiteOggList;
this.context = context;
}
public class ViewHolder extends RecyclerView.ViewHolder
{
public CardView cv;
public TextView txtNumInventario;
public TextView txtNomeCespite;
public TextView txtDtCatalogazione;
public TextView txtAula;
public TextView txtNomeUser;
ViewHolder(View itemView)
{
super (itemView);
//cv = (CardView) itemView.findViewById(R.id.cardView);
txtNumInventario = (TextView) itemView.findViewById(R.id.txtNumeroInventario);
txtNomeCespite = (TextView) itemView.findViewById(R.id.txtNomeCespite);
txtDtCatalogazione = (TextView) …Run Code Online (Sandbox Code Playgroud) android android-fragments android-cardview android-recyclerview