android - 无法在 ViewPager 中膨胀 recyclerView

Question

我无法在 viewPager 中扩充回收站 View 。下面的代码是我的 MainActivity:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    viewPager = findViewById(R.id.pager);
    tabLayout = findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(viewPager);//setting tab over viewpager

    viewPager.setAdapter(new VeiwPagerAdapter());
}

下面是我的 ViewPagerAdapter:

public class VeiwPagerAdapter extends PagerAdapter {
private RecyclerView recyclerView;
private List<Pojo> pojoList = new ArrayList<>();

@Override
public int getCount() {
    return 2;
}

@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
    return false;
}

@NonNull
@Override
public Object instantiateItem(@NonNull ViewGroup container, int position) {
    if (position == 0) {
        LayoutInflater inflater = LayoutInflater.from(container.getContext());
        View view = inflater.inflate(R.layout.recycler_view_holder, container, false);
        recyclerView = view.findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(container.getContext()));
        pojoList.add(new Pojo("Random field 1", "Random field 1"));
        recyclerView.setAdapter(new RecycAdapter(pojoList));
        container.addView(view);
        return view;
    } else {
        LayoutInflater inflater = LayoutInflater.from(container.getContext());
        View view = inflater.inflate(R.layout.recycler_view_holder, container, false);
        recyclerView = view.findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(container.getContext()));
        pojoList.add(new Pojo("Random field 1", "Random field 1"));
        recyclerView.setAdapter(new RecycAdapter(pojoList));
        container.addView(view);
        return view;
    }
}

@Nullable
@Override
public CharSequence getPageTitle(int position) {
    return position == 0 ? "TAB 1" : "TAB 2";
}

回收适配器代码:

public class RecycAdapter extends RecyclerView.Adapter<RecycViewHolder> {
    private List<Pojo> pojoArrayList;

    public RecycAdapter(List<Pojo> pojoArrayList) {
        this.pojoArrayList = pojoArrayList;
    }

    @NonNull
    @Override
    public RecycViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        LayoutInflater inflater = LayoutInflater.from(parent.getContext());

        View v = inflater.inflate(R.layout.item_layout, parent, false);

        return new RecycViewHolder(v);
    }

    @Override
    public void onBindViewHolder(@NonNull RecycViewHolder holder, int position) {
        Pojo pojo = pojoArrayList.get(position);
        holder.textView1.setText(pojo.getText1());
        holder.textView2.setText(pojo.getText2());
    }

    @Override
    public int getItemCount() {
        return pojoArrayList.size();
    }
}

还添加了 ViewHolder 代码。不确定 viewHolder 实现是否有问题。

public class RecycViewHolder extends RecyclerView.ViewHolder {

    public TextView textView1, textView2;

    public RecycViewHolder(View itemView) {
        super(itemView);
        this.textView1 = itemView.findViewById(R.id.textvie1);
        this.textView2 = itemView.findViewById(R.id.textvie2);
    }
}

每个选项卡下的输出都没有。有人可以帮我看看我哪里出错了

Answer 1

为什么您的 MainActivity 上有代码块？

recyclerView = view.findViewById(R.id.recyclerView);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    pojoList.add(new Pojo("Random field 1", "Random field 1"));
    recyclerView.setAdapter(new RecycAdapter(pojoList));
}

我可以看到一些与相同的 R.id.recyclerView 的冲突。

如果您希望 ViewPager 在每个选项卡上显示两个不同的 RecyclerViews，那么您的 MainActivity 应该只有您的 View 的容器。能否就您需要实现的目标提供更多背景信息？

您是否尝试过在每个选项卡上显示一个简单且不同的 TextView/Layout？您可能遇到一些 XML 问题。