我有一个将recyclerView呈现为列表的类(由数组中的元素数量定义),但是在合并数据类时遇到了麻烦。
public class Tab3 extends Fragment {
RecyclerView recyclerView;
String[] Items={"Item 0", "Item 1", "Item 2",};
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.tab3, container, false);
recyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this.getActivity()));
recyclerView.setAdapter(new Adapter(this.getActivity(), Items));
return rootView;
}
}
下面是应包含数据/适配器的类:
public class Adapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
Context context;
String[] items ={"Item 0", "Item 1", "Item 2",};
public Adapter(Context context, String[] items) {
this.context = context;
this.items = this.items;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context);
View row = inflater.inflate(R.layout.custom_row, parent, false);
Item item = new Item(row);
return item;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
((Item) holder).textView.setText(items[position]);
((Item) holder).toggleButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(context, "Clicked at position " + position, Toast.LENGTH_SHORT).show();
}
});
}
@Override
public int getItemCount() {
return items.length;
}
public class Item extends RecyclerView.ViewHolder {
TextView textView;
ToggleButton toggleButton;
public Item(View itemView) {
super(itemView);
textView = (TextView) itemView.findViewById(R.id.item);
toggleButton = (ToggleButton) itemView.findViewById(R.id.toggleButton);
}
}
}
如果我删除线
String[] items ={"Item 0", "Item 1", "Item 2",};
从后一个类中,getItemCount()返回一个null(items.length)-但是,我无法弄清楚如何将其传递给另一段代码。
最佳答案
而不是在您的适配器中
String[] items ={"Item 0", "Item 1", "Item 2",};
至
String[] items;
和这个
this.items = this.items;
至
public Adapter(Context context, String[] items) {
this.context = context;
this.items = items;
}
您可以在
getItemCount
上进行检查,但我不认为有必要进行此检查。@Override
public int getItemCount() {
if (items != null) {
return items.length;
}
return 0;
}