我正在尝试为Android创建一个简单的日历。它应该一次显示一个月,并根据选定的日期列出相关事件。我现在停留在日历UI的实现上,因为它没有正确列出2016年2月及之后的几个月。

而不是29天,它列出了28,并且2月的列表从星期日而不是星期一开始。有人可以看看我的程序并为我提供帮助吗?

我怀疑以下几行中的错误:

// init temporary calendar to monday, first day of displayed month
Calendar calx= getCalendar(year, month, 1);
// get WEEK_OF_YEAR of first Day of Month
int firstWeek = calx.get(Calendar.WEEK_OF_YEAR);
// Set DAY_OF_WEEK to Monday
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
// Set WEEK_OF_YEAR to first week the month is part of
cal.set(Calendar.WEEK_OF_YEAR, firstWeek);


我希望不要通过发布我的完整程序来冒犯任何人,但是我真的不确定该错误在哪里爬行........

drawable / circle_today.xml:

<?xml version="1.0" encoding="utf-8"?>
    <shape xmlns:android="http://schemas.android.com/apk/res/android">
        <solid android:color="#ffff00" />
        <corners
            android:topLeftRadius="30dp"
            android:topRightRadius="30dp"
            android:bottomLeftRadius="30dp"
            android:bottomRightRadius="30dp"
            />
    </shape>


drawable / circle_selected.xml:

<?xml version="1.0" encoding="utf-8"?>
    <shape xmlns:android="http://schemas.android.com/apk/res/android">
        <solid android:color="#00ff00" />
        <corners
            android:topLeftRadius="30dp"
            android:topRightRadius="30dp"
            android:bottomLeftRadius="30dp"
            android:bottomRightRadius="30dp"
            />
    </shape>


layout / activity_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <TableLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:id="@+id/tableLayout"></TableLayout>

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/listView"
        android:layout_below="@+id/tableLayout"
        android:layout_centerHorizontal="true" />

</RelativeLayout>


MainActivity.java:

import android.content.Intent;
import android.graphics.Color;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.GregorianCalendar;

public class MainActivity extends AppCompatActivity {
// TableLayout which holds the calendar matrix
private TableLayout calendarTable;
// list for future use as list of events of selected day
private ListView dayList;
//LIST OF ARRAY STRINGS WHICH WILL SERVE AS LIST ITEMS
ArrayList<String> listItems=new ArrayList<String>();
//DEFINING A STRING ADAPTER WHICH WILL HANDLE THE DATA OF THE LISTVIEW
ArrayAdapter<String> adapter;
// today stays today for the complete lifecycle of MainActivity
private int today;
// thisMonth stays thisMonth for the complete lifecycle of MainActivity
private int thisMonth;
// selectedDay changes onClick
private int selectedDay;
// month changes onClick on day of other month
private int month;
// year changes when other month either is january or december of different year
private int year;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    // get calendar whith parameters of now
    Calendar calendar = getCalendar();
    // initiate global variables
    selectedDay = today = calendar.get(Calendar.DAY_OF_MONTH);
    thisMonth = month = calendar.get(Calendar.MONTH);
    year = calendar.get(Calendar.YEAR);
    // set up TableLayout which holds the calendar matrix
    calendarTable = (TableLayout) findViewById(R.id.tableLayout);
    // set up list for future use as list of events of selected day
    dayList = (ListView) findViewById(R.id.listView);
    adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, listItems);
    dayList.setAdapter(adapter);
    // sanity test
    testCalendar();
    // build calendar table
    updateCalendar();
}

// function to test Calendar behaviour, as expected the output is
// Week: 8 Day: 27 Month: 1
// Week: 8 Day: 28 Month: 1
// Week: 9 Day: 29 Month: 1
// Week: 9 Day: 1 Month: 2
// contrary to UI behaviour which lists 2016-2-1 as sunday and lists only 28 days
private final void testCalendar() {
    Calendar c = getCalendar(2016, 1, 27);
    for (int i = 0; i < 4; i++) {
        System.out.println("Week: " +c.get(Calendar.WEEK_OF_YEAR) + " Day: " +
                c.get(Calendar.DAY_OF_MONTH) + " Month: " + c.get(Calendar.MONTH));
        c.add(Calendar.DAY_OF_MONTH, 1);
    }
}

// function to ensure correct configuration of Calendar
private final Calendar getCalendar() {
    Calendar gc = new GregorianCalendar();
    gc.setFirstDayOfWeek(Calendar.MONDAY);
    gc.setMinimalDaysInFirstWeek(4);
    return gc;
}

// function to ensure correct configuration of Calendar
private final Calendar getCalendar(int year, int month, int day) {
    Calendar gc = new GregorianCalendar(year, month, day);
    gc.setFirstDayOfWeek(Calendar.MONDAY);
    gc.setMinimalDaysInFirstWeek(4);
    return gc;
}

private void updateCalendar() {
    // reset table
    calendarTable.removeAllViews();
    // init calendar used by this function
    Calendar cal = getCalendar();
    // init temporary calendar to monday, first day of displayed month
    Calendar calx= getCalendar(year, month, 1);
    // get WEEK_OF_YEAR of first Day of Month
    int firstWeek = calx.get(Calendar.WEEK_OF_YEAR);
    // Set DAY_OF_WEEK to Monday
    cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
    // Set WEEK_OF_YEAR to first week the month is part of
    cal.set(Calendar.WEEK_OF_YEAR, firstWeek);
    // init reusable vars
    TableRow row = null;
    TextView tv = null;
    int paddingNormal = 35;
    //outer loop, rows
    for (int i = 0; i < 7; i++) {
        // init row
        row = new TableRow(this);
        // stretch row
        // code to stretch row width to parent view, took no effect
        /*row.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT,
                TableRow.LayoutParams.WRAP_CONTENT));*/
        // inner loop, fields
        for (int j = 0; j < 8; j++) {
            // init
            tv = new TextView(this);
            // center day labels
            tv.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL);
            // code to stretch row width to parent view, took no effect
            /*tv.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT,
                    TableRow.LayoutParams.WRAP_CONTENT));*/
            // first row, headers
            if (i == 0) {
                tv.setPadding(paddingNormal, paddingNormal, paddingNormal, paddingNormal);
                tv.setBackgroundColor(Color.rgb(213, 213, 213));
                switch (j) {
                    case 0:
                        break;
                    case 1:
                        tv.setText("MO");
                        break;
                    case 2:
                        tv.setText("DI");
                        break;
                    case 3:
                        tv.setText("MI");
                        break;
                    case 4:
                        tv.setText("DO");
                        break;
                    case 5:
                        tv.setText("FR");
                        break;
                    case 6:
                        tv.setText("SA");
                        break;
                    case 7:
                        tv.setText("SO");
                        break;
                }
            }
            else if (j == 0) {
                // week no
                tv.setPadding(paddingNormal, paddingNormal, paddingNormal, paddingNormal);
                tv.setBackgroundColor(Color.rgb(213, 213, 213));
                tv.setText(""+cal.get(Calendar.WEEK_OF_YEAR));
            } else {
                // days
                tv.setPadding(paddingNormal, paddingNormal, paddingNormal, paddingNormal);
                tv.setText("" + cal.get(Calendar.DAY_OF_MONTH));
                // mark days of different month
                if ((cal.get(Calendar.MONTH) != month)) {
                    tv.setTextColor(Color.rgb(213, 213, 213));
                    // switch to previous or next month
                    tv.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            // set selectedDay of different month
                            selectedDay = Integer.parseInt(((TextView) v).getText() + "");
                            // if selectedDay is bigger 15 it is part of previous month
                            if (selectedDay > 15) {
                                // if month is january
                                if (month == Calendar.JANUARY) {
                                    // month is reset to december
                                    month = Calendar.DECEMBER;
                                    // and year decremented to previous year
                                    year = year - 1;
                                } else {
                                    // else month is decremented
                                    month = month - 1;
                                }
                                // else selectedDay is part of next month
                            } else {
                                // if month is december
                                if (month == Calendar.DECEMBER) {
                                    // month is reset to january
                                    month = Calendar.JANUARY;
                                    // and year is incremented
                                    year = year + 1;
                                } else {
                                    // else only month is incremented
                                    month = month + 1;
                                }
                            }
                            // updateCalendar to display different month
                            updateCalendar();
                        }
                    });
                } else {
                    // mark today with yellow circle
                    if ((cal.get(Calendar.DAY_OF_MONTH) == today) && month == thisMonth) {
                        tv.setBackgroundResource(R.drawable.circle_today);
                    }
                    // mark selected day with green circle
                    if ((cal.get(Calendar.DAY_OF_MONTH) == selectedDay)) {
                        tv.setBackgroundResource(R.drawable.circle_selected);
                    }
                    // setOnclickListener to updateCalendar and display the new selection and dayList
                    tv.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            // set selectedDay before rebuilding table
                            selectedDay = Integer.parseInt(((TextView) v).getText() + "");
                            // rebuild table
                            updateCalendar();
                        }
                    });
                }
                // increment calendar DAY_OF_MONTH field by 1
                cal.add(Calendar.DAY_OF_MONTH, 1);
            }
            // add TextView to row
            row.addView(tv);
        }
        // add row to TableLayout
        calendarTable.addView(row);
    }
    // Set ActionBar Title to "*month* *year*"
    String title ="";
    switch(month)
    {
        case Calendar.JANUARY:
            title = "Jänner " + year;
            break;
        case Calendar.FEBRUARY:
            title = "Februar " + year;
            break;
        case Calendar.MARCH:
            title = "März " + year;
            break;
        case Calendar.APRIL:
            title = "April " + year;
            break;
        case Calendar.MAY:
            title = "Mai " + year;
            break;
        case Calendar.JUNE:
            title = "Juni " + year;
            break;
        case Calendar.JULY:
            title = "Juli " + year;
            break;
        case Calendar.AUGUST:
            title = "August " + year;
            break;
        case Calendar.SEPTEMBER:
            title = "September " + year;
            break;
        case Calendar.OCTOBER:
            title = "Oktober " + year;
            break;
        case Calendar.NOVEMBER:
            title = "November " + year;
            break;
        case Calendar.DECEMBER:
            title = "Dezember " + year;
            break;
    }
    setTitle(title);
    // list events of selected day
    updateDayList();
}

private void updateDayList() {
    // TODO implement...
    adapter.clear();
    adapter.add(selectedDay + "/" + month + "/" + year);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

最佳答案

请记住,DAY_OF_WEEK使用0=Sunday, 1=Monday, ...,依此类推。不知道语言环境是否有所不同,但是在US中,星期从星期日开始。

2015年2月1日是星期日。 WEEK_OF_YEAR是6。
DAY_OF_WEEK设置为1=Monday将使您在2015年2月2日星期一。
我认为那不是你所追求的。

10-07 15:28