我想在我的 recyclerview 中显示这些项目,但它根本不显示,而且我看不到错误。也许你们可以帮帮我。
MainActivity.java
RecyclerView recyclerView = (RecyclerView)findViewById(R.id.rec);
List<MenuData> list = new ArrayList<>();
recyclerView.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(linearLayoutManager);
MenuRecAdapter menuRecAdapter = new MenuRecAdapter(list);
recyclerView.setAdapter(menuRecAdapter);
RecyclerView 适配器:
public class MenuRecAdapter extends RecyclerView.Adapter<RecViewHolder>{
private List<MenuData> mList;
Activity context;
public MenuRecAdapter(List<MenuData> mList){
this.mList = mList;
}
public int getItemCount(){
return mList.size();
}
public RecViewHolder onCreateViewHolder(ViewGroup viewGroup, int position){
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.menuitem, viewGroup, false);
RecViewHolder pvh = new RecViewHolder(v);
return pvh;
}
public void onBindViewHolder(RecViewHolder holder, int i){
holder.menuTeXT.setText(mList.get(i).text);
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
}
项目的ViewHolder:
public class RecViewHolder extends RecyclerView.ViewHolder {
public TextView menuTeXT;
public RecViewHolder(View itemView){
super(itemView);
menuTeXT = (TextView)itemView.findViewById(R.id.menuTXT);
}
}
以及我想放入我的 recyclerview 的数据(什么没有显示):
class MenuData {
String text;
MenuData(String text){
this.text = text;
}
private List<MenuData> list;
private void initializeData(){
list = new ArrayList<>();
list.add(new MenuData("Featured"));
list.add(new MenuData("Categories"));
list.add(new MenuData("Sell"));
list.add(new MenuData("Settings"));
list.add(new MenuData("Logout"));
}
}
提前致谢
最佳答案
在主 Activity 中
ArrayList<String> list = new ArrayList<>();
list.add("something1");
list.add("something2");
RecyclerView recyclerView = (RecyclerView)findViewById(R.id.rec);
recyclerView.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(linearLayoutManager);
MenuRecAdapter menuRecAdapter = new MenuRecAdapter(list);
recyclerView.setAdapter(menuRecAdapter);
RecyclerView 适配器
public class MenuRecAdapter extends RecyclerView.Adapter<RecViewHolder>{
private ArrayList<String> mList = new ArrayList<>();
Activity context;
public MenuRecAdapter(ArrayList<String> mList){
this.mList = mList;
}
public int getItemCount(){
return mList.size();
}
public RecViewHolder onCreateViewHolder(ViewGroup viewGroup, int position){
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.menuitem, viewGroup, false);
RecViewHolder pvh = new RecViewHolder(v);
return pvh;
}
public void onBindViewHolder(RecViewHolder holder, int i){
holder.menuTeXT.setText(mList.get(i));
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
}
ViewHolder 保持不变...
public class RecViewHolder extends RecyclerView.ViewHolder {
public TextView menuTeXT;
public RecViewHolder(View itemView){
super(itemView);
menuTeXT = (TextView)itemView.findViewById(R.id.menuTXT);
}
}
也摆脱了 MenuData 类。上面的代码应该可以正常工作。
关于java - android recyclerview 不显示项目,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30086033/