学习进度条3.14

所花时间：6小时
代码量：300
搏客量：2
了解到的知识点：
1.今日做了一个简单的as项目，用于计算地铁票价
`package com.example.myapplication;

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 androidx.appcompat.app.AppCompatActivity;
import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

private EditText startStation, endStation, ticketQuantity;
private TextView resultText;
private Button calculateButton, payButton;

// 地铁线路数据
private Map<String, Integer> line1 = new HashMap<>();
private Map<String, Integer> line2 = new HashMap<>();
private Map<String, Integer> line3 = new HashMap<>();

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

    // 初始化UI组件
    startStation = findViewById(R.id.startStation);
    endStation = findViewById(R.id.endStation);
    ticketQuantity = findViewById(R.id.ticketQuantity);
    resultText = findViewById(R.id.resultText);
    calculateButton = findViewById(R.id.calculateButton);
    payButton = findViewById(R.id.payButton);

    // 初始化地铁线路数据
    initializeSubwayLines();

    // 计算费用按钮点击事件
    calculateButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            calculateFare();
        }
    });

    // 缴费按钮点击事件
    payButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            payFare();
        }
    });
}

// 初始化地铁线路数据
private void initializeSubwayLines() {
    // 1号线
    line1.put("福泽", 1);
    line1.put("园博园", 2);
    line1.put("商务中心", 3);
    line1.put("会展中心", 4);
    line1.put("东庄", 5);
    line1.put("西庄", 6);
    line1.put("洨河大道", 7);
    line1.put("南村", 8);
    line1.put("石家庄东站", 9);
    line1.put("火炬广场", 10);
    line1.put("留村", 11);
    line1.put("白佛", 12);
    line1.put("朝晖桥", 13);
    line1.put("谈固", 14);
    line1.put("北宋", 15);
    line1.put("体育场", 16);
    line1.put("博物院", 17);
    line1.put("北国商城", 18);
    line1.put("平安大街", 19);
    line1.put("解放广场", 20);
    line1.put("新百广场", 21);
    line1.put("烈士陵园", 22);
    line1.put("和平医院", 23);
    line1.put("长城桥", 24);
    line1.put("时光街", 25);
    line1.put("西王", 26);

    // 2号线
    line2.put("柳辛庄", 1);
    line2.put("铁道大学", 2);
    line2.put("义堂", 3);
    line2.put("建和桥", 4);
    line2.put("长安公园", 5);
    line2.put("北国商城", 6);
    line2.put("裕华路", 7);
    line2.put("槐中路", 8);
    line2.put("欧韵公园", 9);
    line2.put("元村", 10);
    line2.put("石家庄", 11);
    line2.put("塔坛", 12);
    line2.put("仓丰路留村", 13);
    line2.put("南位", 14);
    line2.put("嘉华路", 15);

    // 3号线
    line3.put("乐乡", 1);
    line3.put("太行南大街", 2);
    line3.put("南豆", 3);
    line3.put("中仰陵", 4);
    line3.put("西仰陵", 5);
    line3.put("东二环南路", 6);
    line3.put("位同", 7);
    line3.put("南王", 8);
    line3.put("东王", 9);
    line3.put("塔冢", 10);
    line3.put("孙村", 11);
    line3.put("汇通路", 12);
    line3.put("石家庄", 13);
    line3.put("西三教", 14);
    line3.put("槐安桥", 15);
    line3.put("东里", 16);
    line3.put("新百广场", 17);
    line3.put("市二中", 18);
    line3.put("市庄", 19);
    line3.put("柏林庄", 20);
    line3.put("高柱", 21);
    line3.put("西三庄", 22);
}

// 计算地铁费用
private void calculateFare() {
    String start = startStation.getText().toString();
    String end = endStation.getText().toString();
    String quantityStr = ticketQuantity.getText().toString();

    if (start.isEmpty() || end.isEmpty() || quantityStr.isEmpty()) {
        Toast.makeText(this, "请输入起点、终点和购票数量", Toast.LENGTH_SHORT).show();
        return;
    }

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

    int startIndex = getStationIndex(start);
    int endIndex = getStationIndex(end);

    if (startIndex == -1 || endIndex == -1) {
        Toast.makeText(this, "输入的站点不存在", Toast.LENGTH_SHORT).show();
        return;
    }

    int distance = Math.abs(endIndex - startIndex);
    int farePerTicket = calculateFareBasedOnDistance(distance);
    int totalFare = farePerTicket * quantity;

    resultText.setText("费用：" + totalFare + "元");
}

// 根据站点名称获取索引
private int getStationIndex(String station) {
    if (line1.containsKey(station)) {
        return line1.get(station);
    } else if (line2.containsKey(station)) {
        return line2.get(station);
    } else if (line3.containsKey(station)) {
        return line3.get(station);
    }
    return -1;
}

// 根据距离计算费用
private int calculateFareBasedOnDistance(int distance) {
    if (distance <= 3) {
        return 1;
    } else {
        return 1+distance/3;
    }
}

// 缴费按钮点击事件
private void payFare() {
    String fare = resultText.getText().toString();
    if (fare.equals("费用：0元")) {
        Toast.makeText(this, "请先计算费用", Toast.LENGTH_SHORT).show();
    } else {
        Toast.makeText(this, "缴费成功：" + fare, Toast.LENGTH_SHORT).show();
    }
}

<!-- 起点输入框 -->
<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/startStationLayout"
    style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="起点站"
    app:boxStrokeColor="@color/purple_500"
    app:boxStrokeWidth="1dp"
    app:boxStrokeWidthFocused="2dp"
    android:layout_marginBottom="16dp">

    <com.google.android.material.textfield.TextInputEditText
        android:id="@+id/startStation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="text"
        android:textColor="@color/black"
        android:textColorHint="@color/gray_500" />
</com.google.android.material.textfield.TextInputLayout>

<!-- 终点输入框 -->
<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/endStationLayout"
    style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="终点站"
    app:boxStrokeColor="@color/purple_500"
    app:boxStrokeWidth="1dp"
    app:boxStrokeWidthFocused="2dp"
    android:layout_marginBottom="16dp">

    <com.google.android.material.textfield.TextInputEditText
        android:id="@+id/endStation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="text"
        android:textColor="@color/black"
        android:textColorHint="@color/gray_500" />
</com.google.android.material.textfield.TextInputLayout>

<!-- 购票数量输入框 -->
<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/ticketQuantityLayout"
    style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="购票数量"
    app:boxStrokeColor="@color/purple_500"
    app:boxStrokeWidth="1dp"
    app:boxStrokeWidthFocused="2dp"
    android:layout_marginBottom="24dp">

    <com.google.android.material.textfield.TextInputEditText
        android:id="@+id/ticketQuantity"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:textColor="@color/black"
        android:textColorHint="@color/gray_500" />
</com.google.android.material.textfield.TextInputLayout>

<!-- 计算费用按钮 -->
<com.google.android.material.button.MaterialButton
    android:id="@+id/calculateButton"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="计算费用"
    android:textColor="@color/white"
    android:backgroundTint="@color/purple_500"
    android:layout_marginBottom="16dp"
    app:iconTint="@color/white"
    app:iconPadding="8dp"
    app:cornerRadius="8dp"
    android:elevation="4dp" />

<!-- 显示费用结果 -->
<androidx.cardview.widget.CardView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:cardBackgroundColor="@color/purple_100"
    app:cardCornerRadius="8dp"
    app:cardElevation="4dp"
    android:layout_marginBottom="16dp">

    <TextView
        android:id="@+id/resultText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="费用：0元"
        android:textSize="18sp"
        android:textColor="@color/purple_800"
        android:gravity="center"
        android:padding="16dp" />
</androidx.cardview.widget.CardView>

<!-- 缴费按钮 -->
<com.google.android.material.button.MaterialButton
    android:id="@+id/payButton"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="缴费"
    android:textColor="@color/white"
    android:backgroundTint="@color/purple_500"
    app:iconTint="@color/white"
    app:iconPadding="8dp"
    app:cornerRadius="8dp"
    android:elevation="4dp" />

`