Pro Android with Kotlin

83
CHAPTER 6: Content Providers
CalendarContract
This is a rather complex content provider with many tables. As an example, we are 
accessing the calendars list and adding an event here:
val havePermissions =
ContextCompat.checkSelfPermission(this,
Manifest.permission.WRITE_CALENDAR)
== PackageManager.PERMISSION_GRANTED
&& ContextCompat.checkSelfPermission(this,
Manifest.permission.READ_CALENDAR)
== PackageManager.PERMISSION_GRANTED
if(!havePermissions) {
// Acquire permissions...
}else{
data class CalEntry(val name: String, val id: String)
val calendars = HashMap()
val uri = CalendarContract.Calendars.CONTENT_URI
val cursor = contentResolver.query(
uri, null, null, null, null)
cursor.moveToFirst()
while (!cursor.isAfterLast) {
val calName = cursor.getString(
cursor.getColumnIndex(
CalendarContract.Calendars.NAME))
val calId = cursor.getString(
cursor.getColumnIndex(
CalendarContract.Calendars._ID))
calendars[calName] = CalEntry(calName, calId)
cursor.moveToNext()
}
Log.e("LOG", calendars.toString())
val calId = "4" // You should instead fetch an
// appropriate entry from the map!
val year = 2018
val month = Calendar.AUGUST
val dayInt = 27
val hour = 8
val minute = 30
val beginTime = Calendar.getInstance()
beginTime.set(year, month, dayInt, hour, minute)
val event = ContentValues()
event.put(CalendarContract.Events.CALENDAR_ID,
calId)
event.put(CalendarContract.Events.TITLE,
"MyEvent")
event.put(CalendarContract.Events.DESCRIPTION,
"This is test event")
event.put(CalendarContract.Events.EVENT_LOCATION,
"School")

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84
CHAPTER 6: Content Providers
event.put(CalendarContract.Events.DTSTART,
beginTime.getTimeInMillis())
event.put(CalendarContract.Events.DTEND,
beginTime.getTimeInMillis())
event.put(CalendarContract.Events.ALL_DAY,0)
event.put(CalendarContract.Events.RRULE,
"FREQ=YEARLY")
event.put(CalendarContract.Events.EVENT_TIMEZONE,
"Germany")
val retUri = contentResolver.insert(
CalendarContract.Events.CONTENT_URI, event)
Log.e("LOG", retUri.toString())
}
We didn’t implement the permission inquiry; permissions are described in detail in Chapter 
7
.
CallLog
This is a table listing placed and received calls. Here’s an example to list the table:
val havePermissions =
ContextCompat.checkSelfPermission(this,
Manifest.permission.READ_CALL_LOG)
== PackageManager.PERMISSION_GRANTED
&& ContextCompat.checkSelfPermission(this,
Manifest.permission.WRITE_CALL_LOG)
== PackageManager.PERMISSION_GRANTED
if(!havePermissions) {
// Acquire permissions...
}else {
val uri = CallLog.Calls.CONTENT_URI
val cursor = contentResolver.query(
uri, null, null, null, null)
cursor.moveToFirst()
while (!cursor.isAfterLast) {
Log.e("LOG", "New entry:")
for(name in cursor.columnNames) {
val v = cursor.getString(
cursor.getColumnIndex(name))
Log.e("LOG"," > " + name + " = " + v)
}
cursor.moveToNext()
}
}
We didn’t implement the permission inquiry; permissions are described in detail in Chapter 
7
. 
Table 
6-3
describes the table columns.

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