blocks|key|215166|text|您应该测试此事件的实例是否存在。请参阅documentation+of+the+Android's+CalendarContract.Instances+class。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|215167|特别是在这种情况下，second+query+method应该会有所帮助。|215168|这个例子是我在blog+post+about+the+CalendarContract+provider上发布的一些代码--根据你的需要稍微修改一下：|215169|long+begin+=+//+starting+time+in+milliseconds
long+end+=+//+ending+time+in+milliseconds
String[]+proj+=+
++++++new+String[]{
++++++++++++Instances._ID,+
++++++++++++Instances.BEGIN,+
++++++++++++Instances.END,+
++++++++++++Instances.EVENT_ID};
Cursor+cursor+=+
++++++Instances.query(getContentResolver(),+proj,+begin,+end,+"\"Your+event+title\"");
if+(cursor.getCount()+>+0)+{
+++//+deal+with+conflict
}|code-block|syntax|javascript|215170|请注意:从纪元开始，时间总是以UTC毫秒为单位。因此，您可能需要根据用户的时区进行调整。|215171|最后一个参数应该包含已添加到日历中的事件的标题。保留引号-否则Android会查找"your“、"event”或"title"！|215172|并且不要忘记包括必要的权限。|215173|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/reference/android/provider/CalendarContract.Instances.html|1|https://developer.android.com/reference/android/provider/CalendarContract.Instances.html#query%2528android.content.ContentResolver,%2520java.lang.String%255B%255D,%2520long,%2520long,%2520java.lang.String%2529|2|http://www.grokkingandroid.com/androids-calendarcontract-provider/^0|J|1R|0|0|A|J|1|0|7|19|2|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|D|3|E|5|6|7|18|8|@]|9|@$A|19|B|1A|1|1B]]|C|$]]|$1|F|3|G|5|6|7|1C|8|@]|9|@$A|1D|B|1E|1|1F]]|C|$]]|$1|H|3|I|5|J|7|1G|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|1H|8|@]|9|@]|C|$]]|$1|O|3|P|5|6|7|1I|8|@]|9|@]|C|$]]|$1|Q|3|R|5|6|7|1J|8|@]|9|@]|C|$]]|$1|S|3|-4|5|6|7|1K|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]|10|$5|V|W|X|C|$Y|11]]|12|$5|V|W|X|C|$Y|13]]]]

You should test, if an instance for this event exists. See the <a href="https://developer.android.com/reference/android/provider/CalendarContract.Instances.html" rel="noreferrer">documentation of the Android's CalendarContract.Instances class</a>.

Especially the <a href="https://developer.android.com/reference/android/provider/CalendarContract.Instances.html#query%28android.content.ContentResolver,%20java.lang.String%5B%5D,%20long,%20long,%20java.lang.String%29" rel="noreferrer">second query method</a> should be helpful in this case.

This examples is some code, I posted on my <a href="http://www.grokkingandroid.com/androids-calendarcontract-provider/" rel="noreferrer">blog post about the CalendarContract provider</a> - slightly altered for your needs:

<pre class="lang-java prettyprint-override"><code>long begin = // starting time in milliseconds
long end = // ending time in milliseconds
String[] proj = 
 new String[]{
 Instances._ID, 
 Instances.BEGIN, 
 Instances.END, 
 Instances.EVENT_ID};
Cursor cursor = 
 Instances.query(getContentResolver(), proj, begin, end, "\"Your event title\"");
if (cursor.getCount() &gt; 0) {
 // deal with conflict
}
</code></pre>

Be aware: The time is always in UTC millis since the epoch. So you might have to adjust given the user's timezone.

And the last parameter should contain the title of the event you have added to the calendar. Keep the quotes - otherwise Android looks for "your" or "event" or "title"!

And do not forget to include the necessary permissions.

blocks|key|433377|text|我使用了以下方法检查它，我正在通过event_id检查它是否在日历中...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|433378|public+boolean+isEventInCal(Context+context,+String+cal_meeting_id)+{

+++++Cursor+cursor+=+context.getContentResolver().query(
+++++Uri.parse("content://com.android.calendar/events"),
+++++++new+String[]+{+"_id"+},+"+_id+=+?+",
+++++++new+String[]+{+cal_meeting_id+},+null);

+++++++++++if+(cursor.moveToFirst())+{
+++++++++++++++++++//Yes+Event+Exist...
++++++return+true;
+++++}
+++++return+false;
++++}|code-block|syntax|javascript|433379|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I have used following way to check it ...what i am passing event_id to check whether is it in calendar or not.... 

<pre><code>public boolean isEventInCal(Context context, String cal_meeting_id) {

 Cursor cursor = context.getContentResolver().query(
 Uri.parse("content://com.android.calendar/events"),
 new String[] { "_id" }, " _id = ? ",
 new String[] { cal_meeting_id }, null);

 if (cursor.moveToFirst()) {
 //Yes Event Exist...
 return true;
 }
 return false;
 }
</code></pre>

blocks|key|215239|text|请检查以下内容，这可能会有所帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|215240|private+static+boolean+isEventInCalendar(Context+context,+String+titleText,+long+dtStart,+long+dtEnd)+{

++++final+String[]+projection+=+new+String[]{CalendarContract.Instances.BEGIN,+CalendarContract.Instances.END,+CalendarContract.Instances.TITLE};
++++Cursor+cursor+=+CalendarContract.Instances.query(context.getContentResolver(),+projection,+dtStart,+dtEnd);
++++return+cursor+!=+null+&&+cursor.moveToFirst()+&&+cursor.getString(cursor.getColumnIndex(CalendarContract.Instances.TITLE)).equalsIgnoreCase(titleText);
}|code-block|syntax|javascript|215241|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Please check this, this might help:

<pre><code>private static boolean isEventInCalendar(Context context, String titleText, long dtStart, long dtEnd) {

 final String[] projection = new String[]{CalendarContract.Instances.BEGIN, CalendarContract.Instances.END, CalendarContract.Instances.TITLE};
 Cursor cursor = CalendarContract.Instances.query(context.getContentResolver(), projection, dtStart, dtEnd);
 return cursor != null &amp;&amp; cursor.moveToFirst() &amp;&amp; cursor.getString(cursor.getColumnIndex(CalendarContract.Instances.TITLE)).equalsIgnoreCase(titleText);
}
</code></pre>

blocks|key|215296|text|不建议在UI线程上运行Instances.query，但可以通过确保最小化开始和结束持续时间来高效地运行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|215297|搜索字符串将搜索所有值，而不仅仅是title，因此需要添加一个循环来检查确切的字段值。|215298|public+boolean+eventExistsOnCalendar(String+eventTitle,+long+startTimeMs,+long+endTimeMs)+{
++if+(eventTitle+==+null+%7C%7C+"".equals(eventTitle))+{
++++return+false;
++}
++if+(ActivityCompat.checkSelfPermission(this,+Manifest.permission.READ_CALENDAR)+!=+PackageManager.PERMISSION_GRANTED)+{
++++return+false;
++}
++//+If+no+end+time,+use+start+%2B+1+hour+or+=+1+day.+Query+is+slow+if+searching+a+huge+time+range
++if+(endTimeMs+<=+0)+{
++++endTimeMs+=+startTimeMs+%2B+1000+*+60+*+60;+//+%2B+1+hour
++}

++final+ContentResolver+resolver+=+mContext.getContentResolver();
++final+String[]+duplicateProjection+=+{CalendarContract.Events.TITLE};+//+Can+change+to+whatever+unique+param+you+are+searching+for
++Cursor+cursor+=
++++++CalendarContract.Instances.query(
++++++++++resolver,
++++++++++duplicateProjection,
++++++++++startTimeMs,
++++++++++endTimeMs,
++++++++++'"'+%2B+eventTitle+%2B+'"');

++if+(cursor+==+null)+{
++++return+false;
++}
++if+(cursor.getCount()+==+0)+{
++++cursor.close();
++++return+false;
++}

++while+(cursor.moveToNext())+{
++++String+title+=+cursor.getString(0);
++++if+(eventTitle.equals(title))+{
++++++cursor.close();
++++++return+true;
++++}
++}

++cursor.close();
++return+false;
}|code-block|syntax|javascript|215299|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Instances.query is not recommended to be run on the UI thread, but can be done efficiently by ensuring start and end time duration is minimized.

The search string will search all values, not just title, so adding a loop to check for that an exact field value is necessary.

<pre><code>public boolean eventExistsOnCalendar(String eventTitle, long startTimeMs, long endTimeMs) {
 if (eventTitle == null || "".equals(eventTitle)) {
 return false;
 }
 if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_CALENDAR) != PackageManager.PERMISSION_GRANTED) {
 return false;
 }
 // If no end time, use start + 1 hour or = 1 day. Query is slow if searching a huge time range
 if (endTimeMs &lt;= 0) {
 endTimeMs = startTimeMs + 1000 * 60 * 60; // + 1 hour
 }

 final ContentResolver resolver = mContext.getContentResolver();
 final String[] duplicateProjection = {CalendarContract.Events.TITLE}; // Can change to whatever unique param you are searching for
 Cursor cursor =
 CalendarContract.Instances.query(
 resolver,
 duplicateProjection,
 startTimeMs,
 endTimeMs,
 '"' + eventTitle + '"');

 if (cursor == null) {
 return false;
 }
 if (cursor.getCount() == 0) {
 cursor.close();
 return false;
 }

 while (cursor.moveToNext()) {
 String title = cursor.getString(0);
 if (eventTitle.equals(title)) {
 cursor.close();
 return true;
 }
 }

 cursor.close();
 return false;
}
</code></pre>

I have a list of events in my app. A button on the side lets the user add the event date and time to his/her calender. I use a calender intent to redirect the user to the android calender which the corresponding date and time. Now after the user adds the event to his calender, I would like to disable the 'add event' button which corresponds to the events he/she had already added(so the user avoid adding the same event again). How can I do this? I have gone through the new calender API for android 4.0 but I wasnt able to achieve what I wanted.

Basically what I want is to avoid repeated entries for the same event in the users calender.

Any help would be appreciated.

Check if the event exists before adding it to the Android calender

Android

我的应用程序中有一个事件列表。侧面的按钮允许用户将事件日期和时间添加到他/她的日历中。我使用日历意图将用户重定向到android日历，其中对应的日期和时间。现在，在用户将事件添加到日历后，我想禁用与他/她已经添加的事件相对应的“添加事件”按钮(这样用户就可以避免再次添加相同的事件)。我该怎么做呢？我已经尝试过andro...

问将事件添加到Android日历之前，请检查事件是否存在
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问将事件添加到Android日历之前，请检查事件是否存在EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问将事件添加到Android日历之前，请检查事件是否存在
EN