在项目开发过程中，有时会有预约提醒、定时提醒等需求，这时我们可以使用系统日历来辅助提醒。通过向系统日历中写入事件、设置提醒方式（闹钟），实现到达某个特定的时间自动提醒的功能。这样做的好处是由于提醒功能是交付给系统日历来做，不会出现应用被杀情况，能够做到准时提醒。
一般来说实现向系统日历中读写事件一般有以下几个步骤：
(1)需要有读写日历权限;
(2)如果没有日历账户需要先创建账户;
(3)实现日历事件增删改查、提醒功能;
1.权限申请
为了实现在项目中调用系统日历和插入日程事件，我们首先在AndroidManifest.xml文件中添加如下相关权限
<uses-permission android:name="android.permission.READ_CALENDAR" />
<uses-permission android:name="android.permission.WRITE_CALENDAR" />
2.日历相关uri
系统calendar content provider相关的uri，以下为Android2.2版本以后的uri
private static String CALENDER_URL = "content://com.android.calendar/calendars";
private static String CALENDER_EVENT_URL = "content://com.android.calendar/events";
private static String CALENDER_REMINDER_URL = "content://com.android.calendar/reminders";
3.具体实现
public class CalendarReminderUtils {
private static String CALENDER_URL = "content://com.android.calendar/calendars";
private static String CALENDER_EVENT_URL = "content://com.android.calendar/events";
private static String CALENDER_REMINDER_URL = "content://com.android.calendar/reminders";
private static String CALENDARS_NAME = "boohee";
private static String CALENDARS_ACCOUNT_NAME = "BOOHEE@boohee.com";
private static String CALENDARS_ACCOUNT_TYPE = "com.android.boohee";
private static String CALENDARS_DISPLAY_NAME = "BOOHEE账户";
/**
* 检查是否已经添加了日历账户，如果没有添加先添加一个日历账户再查询
* 获取账户成功返回账户id，否则返回-1
*/
private static int checkAndAddCalendarAccount(Context context) {
int oldId = checkCalendarAccount(context);
if( oldId >= 0 ){
return oldId;
}else{
long addId = addCalendarAccount(context);
if (addId >= 0) {
return checkCalendarAccount(context);
} else {
return -1;
}
}
}
/**
* 检查是否存在现有账户，存在则返回账户id，否则返回-1
*/
private static int checkCalendarAccount(Context context) {
Cursor userCursor = context.getContentResolver().query(Uri.parse(CALENDER_URL), null, null, null, null);
try {
if (userCursor == null) { //查询返回空值
return -1;
}
int count = userCursor.getCount();
if (count > 0) { //存在现有账户，取第一个账户的id返回
userCursor.moveToFirst();
return userCursor.getInt(userCursor.getColumnIndex(CalendarContract.Calendars._ID));
} else {
return -1;
}
} finally {
if (userCursor != null) {
userCursor.close();
}
}
}
/**
* 添加日历账户，账户创建成功则返回账户id，否则返回-1
*/
private static long addCalendarAccount(Context context) {
TimeZone timeZone = TimeZone.getDefault();
ContentValues value = new ContentValues();
value.put(CalendarContract.Calendars.NAME, CALENDARS_NAME);
value.put(CalendarContract.Calendars.ACCOUNT_NAME, CALENDARS_ACCOUNT_NAME);
value.put(CalendarContract.Calendars.ACCOUNT_TYPE, CALENDARS_ACCOUNT_TYPE);
value.put(CalendarContract.Calendars.CALENDAR_DISPLAY_NAME, CALENDARS_DISPLAY_NAME);
value.put(CalendarContract.Calendars.VISIBLE, 1);
value.put(CalendarContract.Calendars.CALENDAR_COLOR, Color.BLUE);
value.put(CalendarContract.Calendars.CALENDAR_ACCESS_LEVEL, CalendarContract.Calendars.CAL_ACCESS_OWNER);
value.put(CalendarContract.Calendars.SYNC_EVENTS, 1);
value.put(CalendarContract.Calendars.CALENDAR_TIME_ZONE, timeZone.getID());
value.put(CalendarContract.Calendars.OWNER_ACCOUNT, CALENDARS_ACCOUNT_NAME);
value.put(CalendarContract.Calendars.CAN_ORGANIZER_RESPOND, 0);
Uri calendarUri = Uri.parse(CALENDER_URL);
calendarUri = calendarUri.buildUpon()
.appendQueryParameter(CalendarContract.CALLER_IS_SYNCADAPTER, "true")
.appendQueryParameter(CalendarContract.Calendars.ACCOUNT_NAME, CALENDARS_ACCOUNT_NAME)
.appendQueryParameter(CalendarContract.Calendars.ACCOUNT_TYPE, CALENDARS_ACCOUNT_TYPE)
.build();
Uri result = context.getContentResolver().insert(calendarUri, value);
long id = result == null ? -1 : ContentUris.parseId(result);
return id;
}
/**
* 添加日历事件
*/
public static void addCalendarEvent(Context context, String title, String description, long reminderTime, int previousDate) {
if (context == null) {
return;
}
int calId = checkAndAddCalendarAccount(context); //获取日历账户的id
if (calId < 0) { //获取账户id失败直接返回，添加日历事件失败
return;
}
//添加日历事件
Calendar mCalendar = Calendar.getInstance();
mCalendar.setTimeInMillis(reminderTime);//设置开始时间
long start = mCalendar.getTime().getTime();
mCalendar.setTimeInMillis(start + 10 * 60 * 1000);//设置终止时间，开始时间加10分钟
long end = mCalendar.getTime().getTime();
ContentValues event = new ContentValues();
event.put("title", title);
event.put("description", description);
event.put("calendar_id", calId); //插入账户的id
event.put(CalendarContract.Events.DTSTART, start);
event.put(CalendarContract.Events.DTEND, end);
event.put(CalendarContract.Events.HAS_ALARM, 1);//设置有闹钟提醒
event.put(CalendarContract.Events.EVENT_TIMEZONE, "Asia/Shanghai");//这个是时区，必须有
Uri newEvent = context.getContentResolver().insert(Uri.parse(CALENDER_EVENT_URL), event); //添加事件
if (newEvent == null) { //添加日历事件失败直接返回
return;
}
//事件提醒的设定
ContentValues values = new ContentValues();
values.put(CalendarContract.Reminders.EVENT_ID, ContentUris.parseId(newEvent));
values.put(CalendarContract.Reminders.MINUTES, previousDate * 24 * 60);// 提前previousDate天有提醒
values.put(CalendarContract.Reminders.METHOD, CalendarContract.Reminders.METHOD_ALERT);
Uri uri = context.getContentResolver().insert(Uri.parse(CALENDER_REMINDER_URL), values);
if(uri == null) { //添加事件提醒失败直接返回
return;
}
}
/**
* 删除日历事件
*/
public static void deleteCalendarEvent(Context context,String title) {
if (context == null) {
return;
}
Cursor eventCursor = context.getContentResolver().query(Uri.parse(CALENDER_EVENT_URL), null, null, null, null);
try {
if (eventCursor == null) { //查询返回空值
return;
}
if (eventCursor.getCount() > 0) {
//遍历所有事件，找到title跟需要查询的title一样的项
for (eventCursor.moveToFirst(); !eventCursor.isAfterLast(); eventCursor.moveToNext()) {
String eventTitle = eventCursor.getString(eventCursor.getColumnIndex("title"));
if (!TextUtils.isEmpty(title) && title.equals(eventTitle)) {
int id = eventCursor.getInt(eventCursor.getColumnIndex(CalendarContract.Calendars._ID));//取得id
Uri deleteUri = ContentUris.withAppendedId(Uri.parse(CALENDER_EVENT_URL), id);
int rows = context.getContentResolver().delete(deleteUri, null, null);
if (rows == -1) { //事件删除失败
return;
}
}
}
}
} finally {
if (eventCursor != null) {
eventCursor.close();
}
}
}
}
