4.12

查找学生打卡
• 所花时间：3
• 代码行数：437
• 博客容量：1
• 代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@color/mainBackground">

    <TextView
        android:layout_marginTop="35dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="25sp"
        android:textColor="@color/white"
        android:text="所有学生的打卡记录如下："
        android:layout_marginBottom="25dp"
        />

    <ListView
        android:id="@+id/learns"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:divider="@null"
        android:background="@color/white"
        android:dividerHeight="0dp"
        />

</LinearLayout>

package com.example.undertaking;

import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

import com.example.undertaking.TaskPackage.DayDAO;
import com.example.undertaking.TaskPackage.DayTask;

import java.security.Key;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class selectFrequency extends AppCompatActivity {
    private ListView listView;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_select_frequency);
        listView = findViewById(R.id.learns);
    }

    @Override
    protected void onStart() {
        super.onStart();
        DayDAO.groupBy(new DayDAO.DayDaoGroupBy() {
            @Override
            public void OperationCompletely(HashMap<String, Integer> map) {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        updateLearnDays(map);
                    }
                });
            }
        });
    }

    private void updateLearnDays(HashMap<String, Integer> map) {
        // 创建一个字符串列表用于存储 DayTask 对象的字符串表示形式
        List<String> dayStrings = new ArrayList<>();
        int count=1;
        map.forEach((key, value) -> {
            dayStrings.add(count+".     姓名："+key+"         打卡次数："+value);
        });

        // 创建适配器并将其应用到 ListView 上
        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, dayStrings);
        listView.setAdapter(adapter);
    }
}