在Android项目中添加一个商品预订功能？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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MainActivity.java代码:
package siso.calendarselector;
import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import siso.calendarselector.lib.CalendarSelectorActivity;
public class MainActivity extends Activity {
private EditText orderEt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void jump(View v) {
EditText et = (EditText) findViewById(R.id.et_input);
orderEt = (EditText) findViewById(R.id.et_order);
int days = Integer.valueOf(et.getText().toString());
String order = orderEt.getText().toString();
Intent i = new Intent(MainActivity.this, CalendarSelectorActivity.class);
i.putExtra(CalendarSelectorActivity.DAYS_OF_SELECT, days);
i.putExtra(CalendarSelectorActivity.ORDER_DAY, order);
startActivityForResult(i, 1);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 1 && resultCode == RESULT_OK) {
String orderInfo = data.getStringExtra(CalendarSelectorActivity.ORDER_DAY);
orderEt.setText(orderInfo);
/* *****注意*****
// 如需转换为Calendar
// 正确转换方法（因为2月没有30天）：
String[] info = orderInfo.split("#");
Calendar c = Calendar.getInstance();
c.set(Integer.valueOf(info[0]), Integer.valueOf(info[1]) - 1, Integer.valueOf(info[2]));
// 错误转换方法：
c.set(Integer.valueOf(info[0]), Integer.valueOf(info[1]), Integer.valueOf(info[2]));
c.add(Calendar.MONTH, -1);
**/
}
}
}CalendarAdapter.java代码:
package siso.calendarselector.lib;
import java.util.ArrayList;
import java.util.Calendar;
import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import siso.calendarselector.R;
/**
* @Description 日历表格适配器
*/
public class CalendarAdapter extends BaseAdapter {
private ArrayList days;
private LayoutInflater mInflater;
private Calendar c;
private Context context;
private String orderDay;
public CalendarAdapter(Context context, Calendar c, int passDays, String orderDay) {
this.c = c;
this.context = context;
this.orderDay = orderDay;
days = CalendarUtils.getDaysOfMonth(this.c, passDays, orderDay);
mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return days.size();
}
@Override
public Day getItem(int arg0) {
return days.get(arg0);
}
@Override
public long getItemId(int arg0) {
return 0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
View v = arg1;
ViewHolder holder = null;
if (v == null) {
v = mInflater.inflate(R.layout.calendar_item, arg2, false);
holder = new ViewHolder();
holder.tv = (TextView) v.findViewById(R.id.tv_calendar_item);
v.setTag(holder);
} else {
holder = (ViewHolder) v.getTag();
}
Day d = getItem(arg0);
switch (d.getType()) {
case TODAY:
setOrderThreeDayStyle(holder.tv, d.isOrdered(), context.getString(R.string.today));
break;
case TOMORROW:
setOrderThreeDayStyle(holder.tv, d.isOrdered(), context.getString(R.string.tomorrow));
break;
case T_D_A_T:
setOrderThreeDayStyle(holder.tv, d.isOrdered(), context.getString(R.string.t_d_a_t));
break;
case ENABLE:
holder.tv.setText(d.isOrdered() ? d.getName() + context.getString(R.string.order_day) : d.getName());
holder.tv.setEnabled(true);
holder.tv.setTextColor(d.isOrdered() ? Color.WHITE : context.getResources().getColor(
R.color.calendar_enable_color));
holder.tv.setBackgroundResource(d.isOrdered() ? R.drawable.calendar_order_item_bg
: R.drawable.normal_calendar_order_item_bg);
holder.tv.setTextSize(d.isOrdered() ? context.getResources().getDimension(
R.dimen.calendar_item_order_day_size) : context.getResources().getDimension(
R.dimen.calendar_item_nonorder_day_size));
break;
case NOT_ENABLE:
holder.tv.setText(d.getName());
holder.tv.setEnabled(false);
holder.tv.setTextColor(context.getResources().getColor(R.color.calendar_disable_color));
holder.tv.setBackgroundColor(Color.WHITE);
holder.tv.setTextSize(context.getResources().getDimension(R.dimen.calendar_item_nonorder_day_size));
break;
}
return v;
}
private void setOrderThreeDayStyle(TextView tv, boolean ordered, String dayStr) {
tv.setText(ordered ? dayStr + context.getString(R.string.order_day) : dayStr);
tv.setEnabled(true);
tv.setTextColor(ordered ? Color.WHITE : context.getResources().getColor(R.color.calendar_threeday_color));
tv.setBackgroundResource(ordered ? R.drawable.calendar_order_item_bg : R.drawable.normal_calendar_order_item_bg);
tv.setTextSize(ordered ? context.getResources().getDimension(R.dimen.calendar_item_order_day_size) : context
.getResources().getDimension(R.dimen.calendar_item_nonorder_day_size));
}
static class ViewHolder {
TextView tv;
}
public void previous() {
if (c.get(Calendar.MONTH) == c.getActualMinimum(Calendar.MONTH)) {
c.set((c.get(Calendar.YEAR) - 1), c.getActualMaximum(Calendar.MONTH), 1);
} else {
c.set(Calendar.MONTH, c.get(Calendar.MONTH) - 1);
}
days = CalendarUtils.getDaysOfMonth(c, 0, orderDay);
notifyDataSetChanged();
}
public void next() {
if (c.get(Calendar.MONTH) == c.getActualMaximum(Calendar.MONTH)) {
c.set((c.get(Calendar.YEAR) + 1), c.getActualMinimum(Calendar.MONTH), 1);
} else {
c.set(Calendar.MONTH, c.get(Calendar.MONTH) + 1);
}
days = CalendarUtils.getDaysOfMonth(c, 0, orderDay);
notifyDataSetChanged();
}
}CalendarListAdapter.java代码:
package siso.calendarselector.lib;
import java.util.Calendar;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.TextView;
import siso.calendarselector.R;
/**
* @Description 日历列表适配器
*/
public class CalendarListAdapter extends BaseAdapter {
private Context context;
private LayoutInflater mInflater;
private int daysOfSelect;
private String orderDay;
private OnCalendarOrderListener listener;
public CalendarListAdapter(Context context, int daysOfSelect, String orderDay) {
this.context = context;
this.daysOfSelect = daysOfSelect;
this.orderDay = orderDay;
mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return CalendarUtils.throughMonth(Calendar.getInstance(), daysOfSelect) + 1;
}
@Override
public Object getItem(int arg0) {
return null;
}
@Override
public long getItemId(int arg0) {
return 0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
View v = arg1;
ViewHolder holder = null;
if (v == null) {
v = mInflater.inflate(R.layout.calendar, arg2, false);
holder = new ViewHolder();
holder.yearAndMonth = (TextView) v.findViewById(R.id.tv_year_month);
holder.calendarGrid = (NoScrollGridView) v.findViewById(R.id.gv_calendar_layout);
v.setTag(holder);
} else {
holder = (ViewHolder) v.getTag();
}
final Calendar c = Calendar.getInstance();
c.add(Calendar.MONTH, arg0);
holder.yearAndMonth.setText(c.get(Calendar.YEAR) + context.getString(R.string.year)
+ (c.get(Calendar.MONTH) + 1) + context.getString(R.string.month));
CalendarAdapter cAdapter = null;
if (arg0 == 0) {
cAdapter = new CalendarAdapter(context, c, daysOfSelect, orderDay);
} else {
int d = daysOfSelect - CalendarUtils.currentMonthRemainDays() - CalendarUtils.getFlowMonthDays(arg0 - 1);
cAdapter = new CalendarAdapter(context, c, d, orderDay);
}
holder.calendarGrid.setAdapter(cAdapter);
holder.calendarGrid.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Calendar cl = (Calendar) c.clone();
cl.set(Calendar.DAY_OF_MONTH, 1);
int day = position + 2 - cl.get(Calendar.DAY_OF_WEEK);
TextView dayTv = (TextView) view.findViewById(R.id.tv_calendar_item);
if (day <= 0 || !dayTv.isEnabled())
return;
String orderInfo = c.get(Calendar.YEAR) + "#" + (c.get(Calendar.MONTH) + 1) + "#" + day;
cl.clear();
cl = null;
if (listener != null)
listener.onOrder(orderInfo);
}
});
return v;
}
static class ViewHolder {
TextView yearAndMonth;
NoScrollGridView calendarGrid;
}
public void setOnCalendarOrderListener(OnCalendarOrderListener listener) {
this.listener = listener;
}
public interface OnCalendarOrderListener {
void onOrder(String orderInfo);
}
}CalendarSelectorActivity.java代码:
package siso.calendarselector.lib;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ListView;
import siso.calendarselector.R;
/**
* @Description 预订日选择
*/
public class CalendarSelectorActivity extends Activity {
/**
* 可选天数
*/
public static final String DAYS_OF_SELECT = "days_of_select";
/**
* 上次预订日
*/
public static final String ORDER_DAY = "order_day";
private int daysOfSelect;
private String orderDay;
private ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.calendar_selector);
daysOfSelect = getIntent().getIntExtra(DAYS_OF_SELECT, 30);
orderDay = getIntent().getStringExtra(ORDER_DAY);
listView = (ListView) findViewById(R.id.lv_calendar);
CalendarListAdapter adapter = new CalendarListAdapter(this, daysOfSelect, orderDay);
listView.setAdapter(adapter);
adapter.setOnCalendarOrderListener(new CalendarListAdapter.OnCalendarOrderListener() {
@Override
public void onOrder(String orderInfo) {
Intent result = new Intent();
result.putExtra(ORDER_DAY, orderInfo);
setResult(RESULT_OK, result);
finish();
}
});
}
}CalendarUtils.java代码:
package siso.calendarselector.lib;
import java.util.ArrayList;
import java.util.Calendar;
public class CalendarUtils {
private static int dayOfMonth, monthOfYear, curYear;
static {
dayOfMonth = Calendar.getInstance().get(Calendar.DAY_OF_MONTH);
monthOfYear = Calendar.getInstance().get(Calendar.MONTH);
curYear = Calendar.getInstance().get(Calendar.YEAR);
}
/**
* Gets the days in month.
*
* @param month the month
* @param year the year
* @return the days in month
*/
public static int getDaysInMonth(int month, int year) {
switch (month) {
case Calendar.JANUARY:
case Calendar.MARCH:
case Calendar.MAY:
case Calendar.JULY:
case Calendar.AUGUST:
case Calendar.OCTOBER:
case Calendar.DECEMBER:
return 31;
case Calendar.APRIL:
case Calendar.JUNE:
case Calendar.SEPTEMBER:
case Calendar.NOVEMBER:
return 30;
case Calendar.FEBRUARY:
return (year % 4 == 0) ? 29 : 28;
default:
throw new IllegalArgumentException("Invalid Month");
}
}
/**
* Gets the flow month days.
*
* @param flowMonth the flow month
* @return the flow month days
*/
public static int getFlowMonthDays(int flowMonth) {
int totalDays = 0;
for (int i = 0; i < flowMonth; i++) {
Calendar c = Calendar.getInstance();
c.add(Calendar.MONTH, i + 1);
int days = getDaysInMonth(c.get(Calendar.MONTH), c.get(Calendar.YEAR));
totalDays += days;
}
return totalDays;
}
/**
* Current month remain days.
*
* @return the int
*/
public static int currentMonthRemainDays() {
Calendar c = Calendar.getInstance();
return getDaysInMonth(c.get(Calendar.MONTH), c.get(Calendar.YEAR)) - c.get(Calendar.DAY_OF_MONTH) + 1;
}
/**
* Through month.
*
* @param calendar the calendar
* @param passDays the pass days
* @return the int
*/
public static int throughMonth(Calendar calendar, int passDays) {
Calendar c = (Calendar) calendar.clone();
int curMonth = c.get(Calendar.MONTH);
int curYear = c.get(Calendar.YEAR);
c.add(Calendar.DAY_OF_MONTH, passDays - 1);
int monthCount = (c.get(Calendar.YEAR) - curYear) * 12 + (c.get(Calendar.MONTH) - curMonth);
return monthCount;
}
/**
* Gets the days of month.
*
* @param calendar the calendar
* @return the days of month
*/
public static String[] getDaysOfMonth(Calendar calendar) {
Calendar month = (Calendar) calendar.clone();
String[] days;
final int FIRST_DAY_OF_WEEK = 0; // Sunday = 0, Monday = 1
month.set(Calendar.DAY_OF_MONTH, 1);
int lastDay = month.getActualMaximum(Calendar.DAY_OF_MONTH);
int firstDay = (int) month.get(Calendar.DAY_OF_WEEK);
if (firstDay == 1) {
days = new String[lastDay + (FIRST_DAY_OF_WEEK * 6)];
} else {
days = new String[lastDay + firstDay - (FIRST_DAY_OF_WEEK + 1)];
}
int j = FIRST_DAY_OF_WEEK;
if (firstDay > 1) {
for (j = 0; j < firstDay - FIRST_DAY_OF_WEEK; j++) {
days[j] = "";
}
} else {
for (j = 0; j < FIRST_DAY_OF_WEEK * 6; j++) {
days[j] = "";
}
j = FIRST_DAY_OF_WEEK * 6 + 1; // sunday => 1, monday => 7
}
int dayNumber = 1;
for (int i = j - 1; i < days.length; i++) {
days[i] = "" + dayNumber;
dayNumber++;
}
return days;
}
/**
* Gets the days of month.
*
* @param calendar the calendar
* @param passDays the pass days
* @param orderDay the order day
* @return the days of month
*/
public static ArrayList getDaysOfMonth(Calendar calendar, int passDays, String orderDay) {
String[] orderInfo = null;
boolean isOrdered = false;
if (orderDay != null)
orderInfo = orderDay.split("#");
Calendar month = (Calendar) calendar.clone();
final int FIRST_DAY_OF_WEEK = 0; // Sunday = 0, Monday = 1
month.set(Calendar.DAY_OF_MONTH, 1);
int lastDay = month.getActualMaximum(Calendar.DAY_OF_MONTH);
int firstDay = (int) month.get(Calendar.DAY_OF_WEEK);
ArrayList days = new ArrayList();
int size;
if (firstDay == 1) {
size = lastDay + (FIRST_DAY_OF_WEEK * 6);
} else {
size = lastDay + firstDay - (FIRST_DAY_OF_WEEK + 1);
}
for (int i = 0; i < size; i++) {
days.add(new Day("", Day.DayType.NOT_ENABLE, isOrdered));
}
int j = FIRST_DAY_OF_WEEK;
if (firstDay > 1) {
for (j = 0; j < firstDay - FIRST_DAY_OF_WEEK; j++) {
days.set(j, new Day("", Day.DayType.NOT_ENABLE, isOrdered));
}
} else {
for (j = 0; j < FIRST_DAY_OF_WEEK * 6; j++) {
days.set(j, new Day("", Day.DayType.NOT_ENABLE, isOrdered));
}
j = FIRST_DAY_OF_WEEK * 6 + 1; // sunday => 1, monday => 7
}
int dayNumber = 1;
for (int i = j - 1; i < days.size(); i++) {
Day.DayType type;
if (month.get(Calendar.YEAR) == curYear && month.get(Calendar.MONTH) == monthOfYear) {
if (dayNumber >= dayOfMonth && dayNumber < dayOfMonth + passDays) {
type = Day.DayType.ENABLE;
if (dayNumber == dayOfMonth) {
type = Day.DayType.TODAY;
if (orderDay == null) {
isOrdered = true;
} else {
isOrdered = false;
}
} else if (dayNumber == dayOfMonth + 1) {
type = Day.DayType.TOMORROW;
} else if (dayNumber == dayOfMonth + 2) {
type = Day.DayType.T_D_A_T;
}
} else {
type = Day.DayType.NOT_ENABLE;
}
} else {
if (dayNumber <= passDays) {
type = Day.DayType.ENABLE;
// 明天/后天在下个月
int remainDays = getDaysInMonth(monthOfYear, curYear) - dayOfMonth;
if (remainDays < 2 && dayNumber <= 2 && Math.abs(month.get(Calendar.MONTH) - monthOfYear) == 1
&& month.get(Calendar.YEAR) == curYear) {
if (remainDays == 1) {
if (dayNumber == 1) {
type = Day.DayType.T_D_A_T;
}
} else if (remainDays == 0) {
if (dayNumber == 1) {
type = Day.DayType.TOMORROW;
} else if (dayNumber == 2) {
type = Day.DayType.T_D_A_T;
}
}
}
} else {
type = Day.DayType.NOT_ENABLE;
}
}
if (orderInfo != null && orderInfo.length == 3 && Integer.valueOf(orderInfo[0]) == month.get(Calendar.YEAR)
&& Integer.valueOf(orderInfo[1]) == (month.get(Calendar.MONTH) + 1)
&& Integer.valueOf(orderInfo[2]) == dayNumber) {
isOrdered = true;
} else {
isOrdered = false;
}
days.set(i, new Day("" + dayNumber, type, isOrdered));
dayNumber++;
}
return days;
}
}Day.java代码:
package siso.calendarselector.lib;
public class Day {
public Day(String name, DayType type, boolean isOrdered) {
setName(name);
setType(type);
setOrdered(isOrdered);
}
public enum DayType {
TODAY, TOMORROW, T_D_A_T, ENABLE, NOT_ENABLE
}
private String name;
private DayType type;
private boolean isOrdered;
public boolean isOrdered() {
return isOrdered;
}
public void setOrdered(boolean isOrdered) {
this.isOrdered = isOrdered;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public DayType getType() {
return type;
}
public void setType(DayType type) {
this.type = type;
}
}NoScrollGridView.java代码:
package siso.calendarselector.lib;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.GridView;
public class NoScrollGridView extends GridView {
public NoScrollGridView(Context context) {
super(context);
}
public NoScrollGridView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
}
}AndroidManifest.xml内容:
<?xml version="1.0" encoding="utf-8"?>
项目运行结果如图:
看完上述内容，你们掌握在Android项目中添加一个商品预订功能的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注创新互联行业资讯频道，感谢各位的阅读！
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