无法在多个选项卡中使用回收器视图
Unable to use recycler views in multiple tabs
我有三个 tabs.For 测试目的,我将相同的片段设置为所有三个 tabs.Fragment 有回收站视图。我只能在第一个片段中查看回收站视图。
Activity代码:
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new TrialsFragment(), getString(R.string.camps));
adapter.addFragment(new TrialsFragment(), getString(R.string.trials));
adapter.addFragment(new TrialsFragment(), getString(R.string.events));
viewPager.setAdapter(adapter);
片段代码:
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
recyclerView = (RecyclerView) getActivity().findViewById(R.id.recycler);
adapter = new TrialsRecyclerViewAdapter();
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(adapter);
}
适配器代码:
public class TrialsRecyclerViewAdapter extends RecyclerView.Adapter<TrialsRecyclerViewAdapter.ViewHolder> {
String[] names = {"Sample Name","Sample Name","Sample Name","Sample Name","Sample Name"};
String[] regNos ={"12345678","12345678","12345678","12345678","12345678"};
@Override
public TrialsRecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
CardView cv = (CardView) LayoutInflater.from(parent.getContext())
.inflate(R.layout.trial_card, parent, false);
return new ViewHolder(cv);
}
@Override
public void onBindViewHolder(TrialsRecyclerViewAdapter.ViewHolder holder, int position) {
final CardView cardView = holder.cardView;
TextView name = (TextView)cardView.findViewById(R.id.trial_name);
TextView regNumber = (TextView)cardView.findViewById(R.id.trial_start_end);
name.setText(names[position]);
regNumber.setText(regNos[position]);
cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
}
@Override
public int getItemCount() {
return names.length;
}
public static class ViewHolder extends RecyclerView.ViewHolder
{
private CardView cardView;
public ViewHolder(CardView v)
{
super(v);
cardView = v;
}
}
}
启动 activity 时,RecyclerView 仅在第一个选项卡中可见。如果我滑动标签,那么它只会在第二个标签中可见。
我在调试时观察到以下错误:
No adapter attached; skipping layout
recyclerView = (RecyclerView) getActivity().findViewById(R.id.recycler);
这是非常错误的。将您的逻辑从 onActivityCreated()
移动到 onViewCreated()
,并获得片段的 自己的 RecyclerView
。每个片段都应该在 onCreateView()
中创建自己的 RecyclerView
,这将是 ViewPager
.
页面的内容
我有三个 tabs.For 测试目的,我将相同的片段设置为所有三个 tabs.Fragment 有回收站视图。我只能在第一个片段中查看回收站视图。
Activity代码:
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new TrialsFragment(), getString(R.string.camps));
adapter.addFragment(new TrialsFragment(), getString(R.string.trials));
adapter.addFragment(new TrialsFragment(), getString(R.string.events));
viewPager.setAdapter(adapter);
片段代码:
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
recyclerView = (RecyclerView) getActivity().findViewById(R.id.recycler);
adapter = new TrialsRecyclerViewAdapter();
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(adapter);
}
适配器代码:
public class TrialsRecyclerViewAdapter extends RecyclerView.Adapter<TrialsRecyclerViewAdapter.ViewHolder> {
String[] names = {"Sample Name","Sample Name","Sample Name","Sample Name","Sample Name"};
String[] regNos ={"12345678","12345678","12345678","12345678","12345678"};
@Override
public TrialsRecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
CardView cv = (CardView) LayoutInflater.from(parent.getContext())
.inflate(R.layout.trial_card, parent, false);
return new ViewHolder(cv);
}
@Override
public void onBindViewHolder(TrialsRecyclerViewAdapter.ViewHolder holder, int position) {
final CardView cardView = holder.cardView;
TextView name = (TextView)cardView.findViewById(R.id.trial_name);
TextView regNumber = (TextView)cardView.findViewById(R.id.trial_start_end);
name.setText(names[position]);
regNumber.setText(regNos[position]);
cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
}
@Override
public int getItemCount() {
return names.length;
}
public static class ViewHolder extends RecyclerView.ViewHolder
{
private CardView cardView;
public ViewHolder(CardView v)
{
super(v);
cardView = v;
}
}
}
启动 activity 时,RecyclerView 仅在第一个选项卡中可见。如果我滑动标签,那么它只会在第二个标签中可见。
我在调试时观察到以下错误:
No adapter attached; skipping layout
recyclerView = (RecyclerView) getActivity().findViewById(R.id.recycler);
这是非常错误的。将您的逻辑从 onActivityCreated()
移动到 onViewCreated()
,并获得片段的 自己的 RecyclerView
。每个片段都应该在 onCreateView()
中创建自己的 RecyclerView
,这将是 ViewPager
.