将多个 Adapter 数据合并到一个 ListView 中

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class CombinedAdapter extends BaseAdapter {

    private Context context;
    private List<Object> dataList; // 使用 Object 存储不同类型的数据
    private LayoutInflater inflater;

    private static final int TYPE_LOAN_APPLICATION = 0;
    private static final int TYPE_LOAN = 1;

    public CombinedAdapter(Context context) {
        this.context = context;
        this.dataList = new ArrayList<>();
        this.inflater = LayoutInflater.from(context);
    }

    // 添加数据
    public void addData(List<?> data, int type) {
        if (data != null && !data.isEmpty()) {
            for (Object item : data) {
                if (type == TYPE_LOAN_APPLICATION && !(item instanceof LoanApplication)) {
                    throw new IllegalArgumentException("Data type mismatch: expected LoanApplication");
                }
                if (type == TYPE_LOAN && !(item instanceof Loan)) {
                    throw new IllegalArgumentException("Data type mismatch: expected Loan");
                }
                dataList.add(item);
            }
            notifyDataSetChanged();
        }
    }

    @Override
    public int getCount() {
        return dataList.size();
    }

    @Override
    public Object getItem(int position) {
        return dataList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public int getItemViewType(int position) {
        Object item = dataList.get(position);
        if (item instanceof LoanApplication) {
            return TYPE_LOAN_APPLICATION;
        } else if (item instanceof Loan) {
            return TYPE_LOAN;
        } else {
            throw new IllegalArgumentException("Unknown data type at position: " + position);
        }
    }

    @Override
    public int getViewTypeCount() {
        return 2; // 两种数据类型
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        int viewType = getItemViewType(position);
        if (convertView == null) {
            switch (viewType) {
                case TYPE_LOAN_APPLICATION:
                    convertView = inflater.inflate(R.layout.item_loan_application, parent, false);
                    LoanApplicationViewHolder loanApplicationViewHolder = new LoanApplicationViewHolder(convertView);
                    convertView.setTag(loanApplicationViewHolder);
                    break;
                case TYPE_LOAN:
                    convertView = inflater.inflate(R.layout.item_loan, parent, false);
                    LoanViewHolder loanViewHolder = new LoanViewHolder(convertView);
                    convertView.setTag(loanViewHolder);
                    break;
            }
        }

        switch (viewType) {
            case TYPE_LOAN_APPLICATION:
                LoanApplicationViewHolder loanApplicationViewHolder = (LoanApplicationViewHolder) convertView.getTag();
                LoanApplication loanApplication = (LoanApplication) getItem(position);
                loanApplicationViewHolder.bind(loanApplication); // 填充 LoanApplication 数据
                break;
            case TYPE_LOAN:
                LoanViewHolder loanViewHolder = (LoanViewHolder) convertView.getTag();
                Loan loan = (Loan) getItem(position);
                loanViewHolder.bind(loan); // 填充 Loan 数据
                break;
        }

        return convertView;
    }

    // ViewHolder for LoanApplication
    static class LoanApplicationViewHolder {
        TextView textViewName;
        TextView textViewAmount;

        public LoanApplicationViewHolder(View itemView) {
            textViewName = itemView.findViewById(R.id.textViewName);
            textViewAmount = itemView.findViewById(R.id.textViewAmount);
        }

        public void bind(LoanApplication loanApplication) {
            textViewName.setText(loanApplication.getName());
            textViewAmount.setText(String.valueOf(loanApplication.getAmount()));
        }
    }

    // ViewHolder for Loan
    static class LoanViewHolder {
        TextView textViewLoanId;
        TextView textViewInterestRate;

        public LoanViewHolder(View itemView) {
            textViewLoanId = itemView.findViewById(R.id.textViewLoanId);
            textViewInterestRate = itemView.findViewById(R.id.textViewInterestRate);
        }

        public void bind(Loan loan) {
            textViewLoanId.setText(loan.getLoanId());
            textViewInterestRate.setText(String.valueOf(loan.getInterestRate()));
        }
    }

    // 模拟数据类
    static class LoanApplication {
        private String name;
        private double amount;

        public LoanApplication(String name, double amount) {
            this.name = name;
            this.amount = amount;
        }

        public String getName() {
            return name;
        }

        public double getAmount() {
            return amount;
        }
    }

    static class Loan {
        private String loanId;
        private double interestRate;

        public Loan(String loanId, double interestRate) {
            this.loanId = loanId;
            this.interestRate = interestRate;
        }

        public String getLoanId() {
            return loanId;
        }

        public double getInterestRate() {
            return interestRate;
        }
    }
}

ListView listView = findViewById(R.id.listView);
CombinedAdapter adapter = new CombinedAdapter(this);

// 模拟数据
List<CombinedAdapter.LoanApplication> loanApplications = new ArrayList<>();
loanApplications.add(new CombinedAdapter.LoanApplication("John Doe", 10000.0));
loanApplications.add(new CombinedAdapter.LoanApplication("Jane Smith", 5000.0));

List<CombinedAdapter.Loan> loans = new ArrayList<>();
loans.add(new CombinedAdapter.Loan("L12345", 5.5));
loans.add(new CombinedAdapter.Loan("L67890", 6.0));

// 添加数据到 Adapter
adapter.addData(loanApplications, CombinedAdapter.TYPE_LOAN_APPLICATION);
adapter.addData(loans, CombinedAdapter.TYPE_LOAN);

listView.setAdapter(adapter);