225.3.15（手机端APP地铁路线）

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

// 石家庄地铁站点映射（修正同名站点问题）
private static final Map<String, Integer> STATION_MAP = new HashMap<>();
static {
    // 1号线站点
    STATION_MAP.put("西王(1号线)", 101);
    STATION_MAP.put("时光街(1号线)", 102);
    STATION_MAP.put("长城桥(1号线)", 103);
    STATION_MAP.put("和平医院(1号线)", 104);
    STATION_MAP.put("烈士陵园(1号线)", 105);
    STATION_MAP.put("新百广场(1号线)", 106);
    STATION_MAP.put("西三庄(3号线)", 301);
    STATION_MAP.put("高柱(3号线)", 302);
    STATION_MAP.put("柏林庄(3号线)", 303);
    STATION_MAP.put("市庄(3号线)", 304);
    STATION_MAP.put("市二中(3号线)", 305);
    STATION_MAP.put("新百广场(3号线)", 306);
    STATION_MAP.put("柳辛庄(2号线)", 201);
    STATION_MAP.put("庄窠-铁道大学(2号线)", 202);
}

private EditText etStartStation, etEndStation, etTicketCount;
private Button btnBuyTickets;
private TextView tvResult;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    etStartStation = findViewById(R.id.et_start_station);
    etEndStation = findViewById(R.id.et_end_station);
    etTicketCount = findViewById(R.id.et_ticket_count);
    btnBuyTickets = findViewById(R.id.btn_buy_tickets);
    tvResult = findViewById(R.id.tv_result);

    btnBuyTickets.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String startStation = etStartStation.getText().toString().trim();
            String endStation = etEndStation.getText().toString().trim();
            String ticketCountStr = etTicketCount.getText().toString().trim();

            // 输入验证
            if (startStation.isEmpty() || endStation.isEmpty() || ticketCountStr.isEmpty()) {
                Toast.makeText(MainActivity.this, "请输入完整信息", Toast.LENGTH_SHORT).show();
                return;
            }

            if (!STATION_MAP.containsKey(startStation) || !STATION_MAP.containsKey(endStation)) {
                Toast.makeText(MainActivity.this, "输入的站点不存在", Toast.LENGTH_SHORT).show();
                return;
            }

            // 获取站点编号
            int startIndex = STATION_MAP.get(startStation);
            int endIndex = STATION_MAP.get(endStation);

            // 检查是否同一线路
            int startLine = startIndex / 100;
            int endLine = endIndex / 100;
            if (startLine != endLine) {
                Toast.makeText(MainActivity.this, "跨线路购票暂不支持，请选择同一线路站点", Toast.LENGTH_SHORT).show();
                return;
            }

            // 计算站数（起点站不计入）
            int stationCount = Math.abs(endIndex - startIndex) - 1;
            if (stationCount < 0) {
                Toast.makeText(MainActivity.this, "请选择正确的站点顺序", Toast.LENGTH_SHORT).show();
                return;
            }

            int ticketCount = Integer.parseInt(ticketCountStr);
            if (ticketCount <= 0) {
                Toast.makeText(MainActivity.this, "购票数量必须大于0", Toast.LENGTH_SHORT).show();
                return;
            }

            // 计算费用
            int fee = (int) Math.ceil((double) stationCount / 3);
            int totalFee = fee * ticketCount;

            tvResult.setText("购票成功，总费用：" + totalFee + " 元\n站数：" + stationCount + "站");
        }
    });
}

}