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Editorial Team
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Asked: 2026-06-15T18:55:06+00:00

The code i’m working on lists the events from the calendar, i need to

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The code i’m working on lists the events from the calendar, i need to limit the range of dates, and in the examples i see this code:

// Construct the query with the desired date range.
Uri.Builder builder = Instances.CONTENT_URI.buildUpon();
ContentUris.appendId(builder, startMillis);
ContentUris.appendId(builder, endMillis);

I don’t understand why appendId is used in this way. startMillis and endMillis are not ids, i would expect that the parameter name had to be provided eg “startdate” , It’s not clear to me why this works, and what other parameters could be specified this way. Are there more parameters supported by appenedId? How can i know?

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1 Answer

  1. Editorial Team

    What appendId actually does is add a /# to your uri where # is a number. In your example (assuming startMillis = 1000 and endMillis = 3000 and the uri content://com.google.calendar/) this would mean your uri could end up like this:

    content://com.google.calendar/1000/3000

    This is something that a uri parser can pickup:

    URIMatcher.addURI(AUTHORITY, calendar + "/#/#", DATE_RANGE);

    Long story short: appendId is just a convenient and type-safe way to add an integer to your uri path.

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