Question

我想从Adapter Class调用Fragment但不能这样做.. 所以请一些方法来调用片段。我有一个第一次调用活动的方法，然后切换片段是否有任何其他方法

以下是代码：

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();
}

}

编辑器无法解决

中的getActivity（）方法

 FragmentManager fm = getActivity().getFragmentManager();

Answer 1

将mContext传递给getFragmentManager();。将mContext投射到Activity。

像这样。

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

Answer 2

更好的方法是使用接口来通知调用适配器的类。

这样的事情：

public interface NotifyChange {

    void onItemClicked();
}

然后在onItemClicked（）中执行操作，想要实现。

Answer 3

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);

如何在不使用Intent的情况下从适配器类打开片段？

3 个答案: