个人作业第二阶段4

完成教师功能总结汇总的前端实现：
实体类：

package com.example.learningmanagement.entity

data class SummaryStatistics(
    val id: Int,
    val className: String,
    val userId: Int,
    val username: String,
    val totalCount: Int
)

API服务接口：

package com.example.learningmanagement.service

import com.example.learningmanagement.entity.ApiResponse
import com.example.learningmanagement.entity.SummaryStatistics
import retrofit2.http.GET
import retrofit2.http.Path

interface SummaryStatisticsService {
    @GET("/statistics/generate")
    suspend fun generateStatistics(): ApiResponse<Any>
    
    @GET("/statistics/selectAll")
    suspend fun selectAll(): ApiResponse<List<SummaryStatistics>>
    
    @GET("/statistics/selectByUserId/{userId}")
    suspend fun selectByUserId(@Path("userId") userId: Int): ApiResponse<SummaryStatistics>
}

列表项布局：

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="4dp"
    app:cardCornerRadius="8dp"
    app:cardElevation="4dp">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:padding="12dp">

        <TextView
            android:id="@+id/tvId"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:textSize="14sp" />

        <TextView
            android:id="@+id/tvClassName"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:textSize="14sp" />

        <TextView
            android:id="@+id/tvUserId"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:textSize="14sp" />

        <TextView
            android:id="@+id/tvUsername"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:textSize="14sp" />

        <TextView
            android:id="@+id/tvTotalCount"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:textSize="14sp"
            android:textStyle="bold" />

    </LinearLayout>
</androidx.cardview.widget.CardView>

活动布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <!-- 顶部标题栏 -->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/pink_500"
        android:gravity="center_vertical"
        android:paddingHorizontal="16dp">

        <!-- 返回按钮 -->
        <ImageButton
            android:id="@+id/btnBack"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="?attr/selectableItemBackgroundBorderless"
            android:src="@drawable/baseline_arrow_back_24"
            android:tint="@color/white"
            android:contentDescription="返回" />

        <!-- 标题 -->
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:text="学生总结统计"
            android:textColor="@color/white"
            android:textSize="18sp"
            android:textStyle="bold" />

        <!-- 刷新按钮 -->
        <View
            android:layout_width="0dp"
            android:layout_height="1dp"
            android:layout_weight="1" />

        <Button
            android:id="@+id/btnRefresh"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="刷新统计"
            android:textSize="12sp" />

    </LinearLayout>

    <!-- 表头 -->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:padding="12dp"
        android:background="@color/gray_200">

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="序号"
            android:textSize="14sp"
            android:textStyle="bold" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:text="班级"
            android:textSize="14sp"
            android:textStyle="bold" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:text="学号"
            android:textSize="14sp"
            android:textStyle="bold" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:text="姓名"
            android:textSize="14sp"
            android:textStyle="bold" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:text="总结次数"
            android:textSize="14sp"
            android:textStyle="bold" />

    </LinearLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rvSummaryStatistics"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

适配器：

package com.example.learningmanagement.adapter

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.DiffUtil
import androidx.recyclerview.widget.ListAdapter
import androidx.recyclerview.widget.RecyclerView
import com.example.learningmanagement.R
import com.example.learningmanagement.entity.SummaryStatistics

class SummaryStatisticsAdapter : ListAdapter<SummaryStatistics, SummaryStatisticsAdapter.ViewHolder>(DiffCallback()) {

    class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        val tvId: TextView = view.findViewById(R.id.tvId)
        val tvClassName: TextView = view.findViewById(R.id.tvClassName)
        val tvUserId: TextView = view.findViewById(R.id.tvUserId)
        val tvUsername: TextView = view.findViewById(R.id.tvUsername)
        val tvTotalCount: TextView = view.findViewById(R.id.tvTotalCount)
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val view = LayoutInflater.from(parent.context)
            .inflate(R.layout.item_summary_statistics, parent, false)
        return ViewHolder(view)
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        val item = getItem(position)
        holder.tvId.text = (position + 1).toString()
        holder.tvClassName.text = item.className
        holder.tvUserId.text = item.userId.toString()
        holder.tvUsername.text = item.username
        holder.tvTotalCount.text = item.totalCount.toString()
    }

    private class DiffCallback : DiffUtil.ItemCallback<SummaryStatistics>() {
        override fun areItemsTheSame(oldItem: SummaryStatistics, newItem: SummaryStatistics) =
            oldItem.id == newItem.id

        override fun areContentsTheSame(oldItem: SummaryStatistics, newItem: SummaryStatistics) =
            oldItem == newItem
    }
}

活动类：

package com.example.learningmanagement.ui

import android.os.Bundle
import android.widget.Button
import android.widget.ImageButton
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.example.learningmanagement.R
import com.example.learningmanagement.adapter.SummaryStatisticsAdapter
import com.example.learningmanagement.network.ServiceCreater
import com.example.learningmanagement.service.SummaryStatisticsService
import kotlinx.coroutines.launch

class SummaryStatisticsActivity : AppCompatActivity() {
    private lateinit var adapter: SummaryStatisticsAdapter
    private lateinit var rvSummaryStatistics: RecyclerView
    private lateinit var btnRefresh: Button
    
    private val statisticsService = ServiceCreater.create<SummaryStatisticsService>()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_summary_statistics)
        
        // 设置返回按钮点击事件
        findViewById<ImageButton>(R.id.btnBack).setOnClickListener {
            finish() // 结束当前活动，返回上一级
        }
        
        rvSummaryStatistics = findViewById(R.id.rvSummaryStatistics)
        btnRefresh = findViewById(R.id.btnRefresh)
        
        setupRecyclerView()
        loadStatistics()
        
        btnRefresh.setOnClickListener {
            generateStatistics()
        }
    }
    
    private fun setupRecyclerView() {
        adapter = SummaryStatisticsAdapter()
        rvSummaryStatistics.apply {
            layoutManager = LinearLayoutManager(this@SummaryStatisticsActivity)
            adapter = this@SummaryStatisticsActivity.adapter
        }
    }
    
    private fun loadStatistics() {
        lifecycleScope.launch {
            try {
                val response = statisticsService.selectAll()
                if (response.code == "200") {
                    response.data?.let { statistics ->
                        adapter.submitList(statistics)
                    }
                } else {
                    Toast.makeText(this@SummaryStatisticsActivity, "获取统计数据失败", Toast.LENGTH_SHORT).show()
                }
            } catch (e: Exception) {
                Toast.makeText(this@SummaryStatisticsActivity, "网络错误: ${e.message}", Toast.LENGTH_SHORT).show()
            }
        }
    }
    
    private fun generateStatistics() {
        lifecycleScope.launch {
            try {
                val response = statisticsService.generateStatistics()
                if (response.code == "200") {
                    Toast.makeText(this@SummaryStatisticsActivity, "统计数据已更新", Toast.LENGTH_SHORT).show()
                    loadStatistics() // 重新加载数据
                } else {
                    Toast.makeText(this@SummaryStatisticsActivity, "更新统计数据失败", Toast.LENGTH_SHORT).show()
                }
            } catch (e: Exception) {
                Toast.makeText(this@SummaryStatisticsActivity, "网络错误: ${e.message}", Toast.LENGTH_SHORT).show()
            }
        }
    }
}