Android 如何在不使用Intent的情况下从适配器类打开片段？

我想从适配器类调用片段，但无法这样做。。 因此，请使用一些方法来调用片段。我有一个方法，首先调用活动，然后切换片段，还有其他方法吗

代码如下：

public class FanAdapter extends RecyclerView.Adapter<FanAdapter.MyViewHolder>
{

private Context mContext;
private List<Fan> FanList;


public class MyViewHolder extends RecyclerView.ViewHolder
{
    public TextView testTitle;
    public CardView mCardView;


    public MyViewHolder(View view)
    {
        super(view);
        mCardView = (CardView) view.findViewById(R.id.card_view);
        testTitle = (TextView) view.findViewById(R.id.fan_name);

    }
}


public FanAdapter(Context mContext, List<Fan> FanList)
{
    this.mContext = mContext;
    this.FanList = FanList;
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
    View itemView = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.fanslist, parent, false);

    return new MyViewHolder(itemView);
}

@Override
public void onBindViewHolder(final MyViewHolder holder, final int position) {
    final Fan album = FanList.get(position);
    holder.testTitle.setText(album.getName());

    holder.mCardView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String Slecteditem= String.valueOf(position);
            Bitmap bmp = BitmapFactory.decodeResource(Resources.getSystem(), position);
            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
            byte[] byteArray = stream.toByteArray();


            Fragment fragment = new ProfileDisplay();
            FragmentManager fm = getActivity().getFragmentManager();
            FragmentTransaction fragmentTransaction = fm.beginTransaction();
            Bundle args = new Bundle();
            args.putString("itemname", Slecteditem);
            args.putByteArray("picture", byteArray);
            fragment.setArguments(args);
            fragmentTransaction.replace(R.id.fl_toplayout, fragment);
            fragmentTransaction.addToBackStack(null);
            fragmentTransaction.commit();

            Toast.makeText(mContext,"Profile"+album.getName(),Toast.LENGTH_LONG).show();

        }
    });



    // loading album cover using Glide library

}

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

将mContext传递给getFragmentManager；。将mContext强制转换为活动

像这样的

FragmentManager fm = (Activity)mContext.getFragmentManager();

---

使用此代码替换适配器类中的片段

  Fragment fragment = new YourFragmentName();
  FragmentManager fm = getActivity().getSupportFragmentManager();
  FragmentTransaction ft = fm.beginTransaction();
  ft.replace(R.id.content_frame, fragment);
  ft.commit();

   Bundle args = new Bundle();
   args.putString("itemname", Slecteditem);
   args.putByteArray("picture", byteArray);
   fragment.setArguments(args);

---

更好的方法是使用接口通知调用适配器的类

大概是这样的：

public interface NotifyChange {

    void onItemClicked();
}

---

然后在onItemClicked中执行您想要实现的操作。

考虑到您的问题，如果您在片段中调用FanAdapter类，请在FanClass列表中创建一个FragmentManager，如下所示

private FragmentManager fragment;
public FragmentManager getFragment() {
    return fragment;
}

public void setFragment(FragmentManager fragment) {
    this.fragment = fragment;
}

并将其添加到风扇构造函数中

public  Fan(FragmentManager fm){
     this.fragment=fm;
}

在你的身体里

在您的列表中，您应该添加getFragmentManager

FragmentManager fm=mContext.getFragmentManager；

public  Fan(FragmentManager fm){
     this.fragment=fm;
}

FragmentTransaction ft=fan.get(position).getFragment().beginTransaction();
ft.replace(R.id.nav_host_fragment,fd);
ft.commit();

fan.add(new fan(your,own,variables,getFragmentManager()));