当我按下clockInOut按钮时，如何获取当前时间并填充到RecyclerView中？

Question

过去两个月我一直在自学如何编码，并决定尝试制作一个计时应用程序。我检查了这段代码中的所有地方，我运行了日志，我什至询问了 chatGPT，我一生都无法弄清楚为什么这些时间不会填充 RecyclerViews。

我没有足够的空间来粘贴 .xml 文件，但如果需要，可以将其放在其他地方，或者我可以看看是否可以只使用相关部分。

以下是相关文件：

TimeClockActivity.java

package com.codecademy.workapp3;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Switch;
import android.widget.TextView;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import java.sql.Time;
import java.util.ArrayList;
import java.util.Calendar;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

public class TimeClockActivity extends AppCompatActivity {

    //declare Home Page Activity member variables (7txt_views, 3btn, 2edit_txt)

    private Button backHomeButton;
    private TextView timeClockTitleTextView;
    private TextView hoursWorkedTodayTextView;
    private TextView totalHoursWorkedTodayTextView;
    private TextView hoursWorkedThisWeekTextView;
    private TextView totalHoursWorkedWeekTextView;
    private TextView projectedPayTextView;
    private TextView totalProjectedPayTextView;
    private TextView dateTimeDisplay;
    private Calendar calendar;
    private SimpleDateFormat dateFormat;
    private SimpleDateFormat timeFormat;
    private String date;
    private Button clockInButton;
    private Button clockInAtButton;
    private TextView[] clockedInTextViews;
    private TextView[] clockedOutTextViews;
    private Switch[] lunchSwitches;
    private boolean isClockIn = false;
    private Map<String, TimeEntry> dayToTimeEntry = new HashMap<>();
    private RecyclerView[] recyclerViews;
//    private TimeEntryAdapter[] adapters;
    private TimeEntryAdapter clockedInAdapter;
    private TimeEntryAdapter clockedOutAdapter;

    //    @SuppressLint("MissingInflatedId")
    @SuppressLint("MissingInflatedId")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_time_clock);

        initializeViews();
        initializeDateAndTime();
        initializeRecyclerViews();
        setClickListeners();
    }

        // apply basic page instances
    private void initializeViews() {

        backHomeButton = findViewById(R.id.btn_to_home);
        hoursWorkedTodayTextView = findViewById(R.id.tv_hours_worked_today_text);
        totalHoursWorkedTodayTextView = findViewById(R.id.tv_hours_worked_today);
        hoursWorkedThisWeekTextView = findViewById(R.id.tv_hours_worked_this_week_text);
        totalHoursWorkedWeekTextView = findViewById(R.id.tv_hours_worked_this_week);
        projectedPayTextView = findViewById(R.id.tv_projected_paycheck_text);
        totalProjectedPayTextView = findViewById(R.id.tv_projected_paycheck);
        dateTimeDisplay = findViewById(R.id.tv_date_and_time);
        clockInButton = findViewById(R.id.btn_clock_in);
        clockInAtButton = findViewById(R.id.btn_clock_in_at);
        timeClockTitleTextView = findViewById(R.id.tv_time_clock_title);
        lunchSwitches = new Switch[]{
                findViewById(R.id.switch_monday_lunch),
                findViewById(R.id.switch_tuesday_lunch),
                findViewById(R.id.switch_wednesday_lunch),
                findViewById(R.id.switch_thursday_lunch),
                findViewById(R.id.switch_friday_lunch),
                findViewById(R.id.switch_saturday_lunch),
                findViewById(R.id.switch_sunday_lunch)
        };
    }

    private void initializeDateAndTime() {
        //apply the instances created for calendar and time
        calendar = Calendar.getInstance();
        dateFormat = new SimpleDateFormat("MM/dd/yyyy HH:mm aa");
        timeFormat = new SimpleDateFormat("HH:mm - E");
        updateDateTimeDisplay();
    }
    private void updateDateTimeDisplay() {
//        date = dateFormat.format(calendar.getTime());
        String date = timeFormat.format(new Date());
        dateTimeDisplay.setText(date);
    }
    private void initializeRecyclerViews() {
        RecyclerView[] clockedInRecyclerViews = new RecyclerView[]{
            findViewById(R.id.recycler_monday_clocked_in),
            findViewById(R.id.recycler_tuesday_clocked_in),
            findViewById(R.id.recycler_wednesday_clocked_in),
            findViewById(R.id.recycler_thursday_clocked_in),
            findViewById(R.id.recycler_friday_clocked_in),
            findViewById(R.id.recycler_saturday_clocked_in),
            findViewById(R.id.recycler_sunday_clocked_in)
        };

        RecyclerView[] clockedOutRecyclerViews = new RecyclerView[]{
            findViewById(R.id.recycler_monday_clocked_out),
            findViewById(R.id.recycler_tuesday_clocked_out),
            findViewById(R.id.recycler_wednesday_clocked_out),
            findViewById(R.id.recycler_thursday_clocked_out),
            findViewById(R.id.recycler_friday_clocked_out),
            findViewById(R.id.recycler_saturday_clocked_out),
            findViewById(R.id.recycler_sunday_clocked_out)
        };

        clockedInAdapter = new TimeEntryAdapter(new ArrayList<>(), "clockedIn");
        clockedOutAdapter = new TimeEntryAdapter(new ArrayList<>(), "clockedOut");

        for (int i = 0; i < clockedInRecyclerViews.length; i++) {
            clockedInRecyclerViews[i].setLayoutManager(new LinearLayoutManager(this));
            clockedInRecyclerViews[i].setAdapter(clockedInAdapter);
        }

        for (int i = 0; i < clockedOutRecyclerViews.length; i++) {
            clockedOutRecyclerViews[i].setLayoutManager(new LinearLayoutManager(this));
            clockedOutRecyclerViews[i].setAdapter(clockedOutAdapter);
        }
    }

    private void setClickListeners() {

//      set button click ability for the 'back home' button
        backHomeButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onBackHomeClick(v);
            }
        });
//      set button click ability for the 'clock in' button
        clockInButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onClockInButtonClick(v);
            }
        });

    }


    //  give the 'back home' button some functionality
    private void onBackHomeClick(View v) {
        Intent intent = new Intent(this, HomePageActivity.class);
        startActivity(intent);
    }

    // give the clock in button some functionality
    public void onClockInButtonClick(View view) {
        // Determine the current day

        int dayOfTheWeek = calendar.get(Calendar.DAY_OF_WEEK);
        String day = getDayName(dayOfTheWeek);

        Log.d("Time ClockActivity", "Clicked on day: " + day);

        // Get or create a TimeEntry for the current day
        TimeEntry timeEntry = dayToTimeEntry.get(day);
        if (timeEntry == null) {
            timeEntry = new TimeEntry(day);
            dayToTimeEntry.put(day, timeEntry);
            Log.d("TimeClockActivity", "Created new TimeEntry for day: " + day);
        }

        // Add clock-in or clock-out time
        String currentTime = timeFormat.format(new Date());
        Log.d("TimeClockActivity", "Current time: " + currentTime);
        if (isClockIn) {
            timeEntry.addClockInTime(currentTime);
        } else {
            timeEntry.addClockOutTime(currentTime);
        }

        // Update the RecyclerView adapters and notify them of the data change
        if (isClockIn) {
            clockedInAdapter.notifyDataSetChanged();
        } else {
            clockedOutAdapter.notifyDataSetChanged();
        }

        if (isClockIn) {
            // User is clocking in
            timeEntry.addClockInTime(currentTime);
            clockInButton.setText("Clock In"); // Change the button text
        } else {
            // User is clocking out
            timeEntry.addClockOutTime(currentTime);
            clockInButton.setText("Clock Out"); // Change the button text
        }

        isClockIn = !isClockIn;
    }

    private String getDayName(int dayOfTheWeek) {
        String day;
        switch (dayOfTheWeek) {
            case Calendar.SUNDAY:
                day = "Sunday";
                break;
            case Calendar.MONDAY:
                day = "Monday";
                break;
            case Calendar.TUESDAY:
                day = "Tuesday";
                break;
            case Calendar.WEDNESDAY:
                day = "Wednesday";
                break;
            case Calendar.THURSDAY:
                day = "Thursday";
                break;
            case Calendar.FRIDAY:
                day = "Friday";
                break;
            case Calendar.SATURDAY:
                day = "Saturday";
                break;
            default:
                day = "Unknown";
                break;
        }
        return day;
    }

TimeEntry.java

package com.codecademy.workapp3;

import android.util.Log;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Locale;

public class TimeEntry {
    private String day;
    private String clockInTime;
    private String clockOutTime;
    private List<String> clockInTimes;
    private List<String> clockOutTimes;
    private String dayOfWeek;

    public TimeEntry(String day) {
        this.day = day;
        this.clockInTime = null;
        this.clockOutTime = null;
        this.clockInTimes = new ArrayList<>();
        this.clockOutTimes = new ArrayList<>();
        setDayOfWeek();
    }

    public void setDayOfWeek() {
        SimpleDateFormat inputFormat = new SimpleDateFormat("EEEE", Locale.getDefault());
        SimpleDateFormat outputFormat = new SimpleDateFormat("EEEE", Locale.getDefault());
        try {
            Date date = inputFormat.parse(day);
            dayOfWeek = outputFormat.format(date);
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }


    public String getClockInTime() {
        return clockInTime;
    }

    public void setClockInTime(String clockInTime) {
        this.clockInTime = clockInTime;
    }

    public String getClockOutTime() {
        return clockOutTime;
    }

    public void setClockOutTime(String clockOutTime) {
        this.clockOutTime = clockOutTime;
    }

    public boolean hasClockInTime() {
        return clockInTime != null;
    }

    public boolean hasClockOutTime() {
        return clockOutTime != null;
    }

    public List<String> getClockInTimes() {
        return clockInTimes;
    }

    public List<String> getClockOutTimes() {
        return clockOutTimes;
    }

    public String getDayOfWeek() {
        return dayOfWeek;
    }

    public void addClockInTime(String clockInTime) {
        Log.d("TimeEntry", "Added clock-in time: " + clockInTime);
        clockInTimes.add(clockInTime);
    }

    public void addClockOutTime(String clockOutTime) {
        Log.d("TimeEntry", "Added clock-out time: " + clockOutTime);
        clockOutTimes.add(clockOutTime);
    }

    public void setDayOfWeek(String dayOfWeek) {
        this.dayOfWeek = dayOfWeek;
    }
}

TimeEntryAdapter.java

package com.codecademy.workapp3;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

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

public class TimeEntryAdapter extends RecyclerView.Adapter<TimeEntryAdapter.TimeEntryViewHolder> {
    private List<TimeEntry> timeEntries;
    private String entryType;

    // Constructor for the adapter
    public TimeEntryAdapter(List<TimeEntry> timeEntries, String entryType) {
        this.timeEntries = timeEntries;
        this.entryType = entryType;
    }

    @Override
    public TimeEntryViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // Inflate your custom item layout here
        View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.time_entry_item, parent, false);
        return new TimeEntryViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(TimeEntryViewHolder holder, int position) {
        TimeEntry timeEntry = timeEntries.get(position);

        // Get references to the views within the item layout
        TextView dayOfWeekTextView = holder.dayOfWeekTextView;
        TextView clockedInTimeTextView = holder.clockedInTimeTextView;
        TextView clockedOutTimeTextView = holder.clockedOutTimeTextView;

        // Set data for the views based on the TimeEntry
        dayOfWeekTextView.setText(timeEntry.getDayOfWeek()); // Set the day dynamically
        clockedInTimeTextView.setText("Clock In: " + timeEntry.getClockInTime()); // Set clock-in time dynamically
        clockedOutTimeTextView.setText("Clock Out: " + timeEntry.getClockOutTime()); // Set clock-out time dynamically
    }

    @Override
    public int getItemCount() {
        return timeEntries.size();
    }



    public class TimeEntryViewHolder extends RecyclerView.ViewHolder {
        TextView dayOfWeekTextView;
        TextView clockedInTimeTextView;
        TextView clockedOutTimeTextView;

        public TimeEntryViewHolder(View itemView) {
            super(itemView);
            dayOfWeekTextView = itemView.findViewById(R.id.dayOfWeekTextView);
            clockedInTimeTextView = itemView.findViewById(R.id.clockedInTimeTextView);
            clockedOutTimeTextView = itemView.findViewById(R.id.clockedOutTimeTextView);
        }
    }
}

我只想按“上班打卡”/“下班打卡”按钮，并让它填充正确日期的正确 Recyler 视图，以及是否是上班时间或下班时间。我让它在 TextViews 上工作得很好，然后决定“如果有人在同一天打卡上下班两次怎么办”。现在我正在对着电脑说废话。预先感谢，如果需要更多信息，请告诉我。

Answer 1

您永远不会更新适配器内的内部数组列表 ->

private List<TimeEntry> timeEntries;

在适配器中添加这样的功能。

public void addEntry(TimeEntry entry) {
    timeEntries.add(entry);
    //This is a bad solution, but for your code structure and experience it will do.
    notifyDataSetChanged(); 
}

该数组列表就是回收器显示的内容，如果您从未添加到它，它永远不会改变。

如果您按星期几分隔视图，那么您会遇到另一个问题，每个回收器都需要一个适配器，您不能重复使用相同的适配器，因为它包含所显示内容的列表。如果每个 recyclerView 需要显示的内容不同，则它们不能是相同的适配器。

即你不能这样做

        for (int i = 0; i < clockedInRecyclerViews.length; i++) {
            clockedInRecyclerViews[i].setLayoutManager(new LinearLayoutManager(this));
            clockedInRecyclerViews[i].setAdapter(clockedInAdapter); //<-- Bad
        }