Saving Data on Android

Upda/ng data
To update data, call 
update
 on the content resolver object and pass in content values 
that include key-values for the columns being updated in the corresponding row.
Saving Data on Android
Chapter 4: ContentProvider
raywenderlich.com
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Arguments should also be included for selection criteria and arguments to identify 
the correct records to update. When populating the content values, you only have to 
include columns that you're updating, and including column keys with a null value 
will clear out the data for that column. One important consideration when updating 
data is to sanitize user input. The developer guide to protecting against malicious 
data has been included in the