Pro Android with Kotlin

74
CHAPTER 6: Content Providers
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override fun getInt(column: Int): Int
This gets a long value (the column index is zero based).
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override fun getLong(column: Int): Long
This gets a long value (the column index is zero based).
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override fun getShort(column: Int): Short
This gets a short value (the column index is zero based).
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override fun getFloat(column: Int): Float
This gets a float value (the column index is zero based).
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override fun getDouble(column: Int): Double
This gets a double value (the column index is zero based).
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override fun getString(column: Int): String
This gets a string value (the column index is zero based).
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override fun isNull(column: Int): Boolean
This tells whether the value is null (the column index is zero based).
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override fun getType(column: Int): Int
You don’t have to overwrite this, but if you don’t, it will always return 
Cursor.FIELD_TYPE_STRING, assuming that getString() will always return 
something meaningful. For more fine-grained control, let it return one of 
FIELD_TYPE_NULL, FIELD_TYPE_INTEGER, FIELD_TYPE_FLOAT, FIELD_TYPE_
STRING, or FIELD_TYPE_BLOB. The column index is zero based.
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override fun getBlob(column: Int): ByteArray
Overwrite this, if you want to support blobs. Otherwise, an 
UnsupportedOperationException will be thrown.
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override fun onMove(oldPosition: Int, newPosition: Int): Boolean
Although not marked as abstract, you must overwrite this. Your 
implementation must move the cursor to the corresponding position in the 
result set. Possible values range from -1 (before the first position; not a 
valid position) to count (after the last position; not a valid position). Let it 
return true if the move was successful. If you don’t overwrite it, nothing will 
happen, and the function returns always true.
AbstractCursor also provides a method called fillWindow(position: Int, window: 
CursorWindow?): Unit that you can use to fill an android.database.CursorWindow object 
based on the result set from the query. See the online API documentation of CursorWindow to 
proceed with this approach.
Besides AbstractCursor, the Cursor interface has a couple more (abstract) implementations 
you can use, as summarized in Table 
6-2
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