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。我现在卡在了日历 UI 的实现上，因为它没有正确列出 2016 年 2 月和接下来的月份。
它列出了 28 天而不是 29 天，而且 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帮助我吗？
我怀疑是以下几行错误:
// 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，但我真的不确定错误在哪里爬行.......
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, ... 等等。不知道区域设置是否有所不同，但在 US 中，一周从星期日开始。
2015 年 2 月 1 日是星期日。 WEEK_OF_YEAR 是 6。
将 DAY_OF_WEEK 设置为 1=Monday 将得到 2015 年 2 月 2 日星期一。
我不认为那是你想要的。
关于java - 为什么我的程序不能正确显示 2016 年 2 月及之后的月份？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32101813/