在ViewHolder中替换convertView的ViewPager片段onClick

Question

我是位机器人新手，当用户单击父片段的列表视图时，我尝试实现details子片段。但是，我不知道该如何实现。父片段在viewpager中。请帮忙。

这是下面的viewpager代码内的父片段：

public class OpenTradesFragment extends Fragment implements OTClickListener  {

    public static final String LOG_TAG = MainActivity.class.getSimpleName();
    private static final String OPEN_TRADES_REQUEST_URL = "https://google.com;
    String BUYING_DATE="BD :";
    String TRADE_LOCKED="Trade Locked";
    String UNLOCK="UNLOCK";
    String BUYING_PRICE ="Buying Price";
    public static final String FREETRADE = "freeTrade";
    ListView openTradesListView;
    ProgressBar otProgressBar;
    OpenTradesAdapter openTradesAdapter;
    ArrayList<OpenTrades> OpenTradesList = new ArrayList<>();
    static int paise;
    SharedPreferences sharedPref;
    private TextView mEmptyStateTextView;
    public OpenTradesFragment() {
    }

    OTClickListener mCallback;

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (savedInstanceState != null) {

        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_open_trades, container, false);
        FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
        String uid = user.getUid();
        sharedPref = this.getActivity().getSharedPreferences(uid, Context.MODE_PRIVATE);

        openTradesListView = rootView.findViewById(R.id.open_trades_listview);

        otProgressBar = rootView.findViewById(R.id.ot_progressbar);
        otProgressBar.setVisibility(View.VISIBLE);

        mEmptyStateTextView = rootView.findViewById(R.id.empty_view);

        openTradesListView.setEmptyView(mEmptyStateTextView);

        new OpenTradesAsyncTask().execute();

        return rootView;
    }

    @Override
    public void onSaveInstanceState(@NonNull Bundle outState) {
        super.onSaveInstanceState(outState);
    }

    @Override
    public void onOpenTradeClicked(int position) {
        OTDetailsFragment detailsFragment = new OTDetailsFragment();
        FragmentManager fm = getChildFragmentManager();
                fm.beginTransaction()
                .replace(R.id.otdetails_container, detailsFragment)
                .addToBackStack(null)
                .commit();
    }

这是下面的适配器代码：

public class OpenTradesAdapter extends ArrayAdapter<OpenTrades> {

    public static final String LOG_TAG = MainActivity.class.getSimpleName();
    private ArrayList<OpenTrades> openTradesArrayList;
    public static final int TYPE_LOCKED = 1;
    public static final int TYPE_UNLOCKED = 0;
    public static String tradeNumber;
    FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
    OTClickListener mListener;


    public OpenTradesAdapter(@NonNull Context context, @NonNull ArrayList<OpenTrades> openTrades, OTClickListener otClickListener) {
        super(context, 0, openTrades);
        openTradesArrayList = openTrades;
        mListener = otClickListener;
    }

    @Override
    public int getItemViewType(int position) {
        OpenTrades currentOpenTrade = openTradesArrayList.get(position);

        if (currentOpenTrade.isLocked) {
            return TYPE_LOCKED;
        } else {
            return TYPE_UNLOCKED;
        }
    }

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

    @NonNull
    @Override
    public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        final OpenTrades currentOpenTrade = openTradesArrayList.get(position);


        if (getItemViewType(position) == TYPE_LOCKED) {
            ViewHolderLocked holderLocked;
            if (convertView == null) {
                convertView = LayoutInflater.from(getContext()).inflate(
                        R.layout.open_trades_list_item_locked, parent, false);

                holderLocked = new ViewHolderLocked();
                holderLocked.t1 =  convertView.findViewById(R.id.stock_name_locked);
                holderLocked.t2 =  convertView.findViewById(R.id.bought_on_locked);
                holderLocked.t3 =  convertView.findViewById(R.id.buying_date_locked);
                holderLocked.i1 =  convertView.findViewById(R.id.open_trades_icon_locked);
                holderLocked.b1 =  convertView.findViewById(R.id.unlock_now_button);
                holderLocked.b1.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                            tradeNumber = currentOpenTrade.getTradeNumber();
                            startPayment();
                    }
                });

                convertView.setTag(holderLocked);
            } else {
                holderLocked = (ViewHolderLocked) convertView.getTag();
            }

            holderLocked.i1.setImageResource(currentOpenTrade.getOpenImage());
            holderLocked.t1.setText(currentOpenTrade.getOpenStock());
            holderLocked.t2.setText(currentOpenTrade.getOpenBuyingDate());
            holderLocked.t3.setText(currentOpenTrade.getOpenBD());
            holderLocked.b1.setText(currentOpenTrade.getOpenBuyingPrice());
            holderLocked.b1.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    tradeNumber = currentOpenTrade.getTradeNumber();
                    startPayment();
                }
            });

            convertView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    tradeNumber = currentOpenTrade.getTradeNumber();
                    startPayment();
                }
            });

            return convertView;
        }

        else  {
            ViewHolderUnlocked holderUnLocked;
            if (convertView == null) {
                convertView = LayoutInflater.from(getContext()).inflate(
                        R.layout.open_trades_list_item_unlocked, parent, false);

                holderUnLocked = new ViewHolderUnlocked();
                holderUnLocked.t1 = (TextView) convertView.findViewById(R.id.stock_name);
                holderUnLocked.t2 = (TextView) convertView.findViewById(R.id.bought_on);
                holderUnLocked.t3 = (TextView) convertView.findViewById(R.id.buying_date);
                holderUnLocked.t4 = (TextView) convertView.findViewById(R.id.open_trade_buying_price);
                holderUnLocked.t5 = (TextView) convertView.findViewById(R.id.open_trade_bp);
                holderUnLocked.i1 = (ImageView) convertView.findViewById(R.id.open_trades_icon);

                convertView.setTag(holderUnLocked);
            } else {
                holderUnLocked = (ViewHolderUnlocked) convertView.getTag();
            }
            holderUnLocked.i1.setImageResource(currentOpenTrade.getOpenImage());
            holderUnLocked.t1.setText(currentOpenTrade.getOpenStock());
            holderUnLocked.t2.setText(currentOpenTrade.getOpenBuyingDate());
            holderUnLocked.t3.setText(currentOpenTrade.getOpenBD());
            holderUnLocked.t4.setText(currentOpenTrade.getOpenBuyingPrice());
            holderUnLocked.t5.setText(currentOpenTrade.getOpenBP());

            convertView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                   mListener.onOpenTradeClicked(position);
                }
            });
            return convertView;
            }
    }

    public static class ViewHolderLocked {
        TextView t1, t2, t3;
        ImageView i1;
        Button b1;
    }

    public static class ViewHolderUnlocked {
    TextView t1, t2, t3, t4, t5;
    ImageView i1;
}