Pro Android with Kotlin

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CHAPTER 6: Content Providers
3. 
Permission exemptions
By using the grantUriPermission attribute of the 
 element, you can temporarily 
grant permissions to components called by intent from the app that owns the content 
provider. If you set grantUriPermission to true and the intent for calling the other 
component gets constructed using the help of this:
intent.addFlags(
Intent.FLAG_GRANT_READ_URI_PERMISSION)
/*or*/
intent.addFlags(
Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
/*or*/
intent.addFlags(
Intent.FLAG_GRANT_WRITE_URI_PERMISSION and
Intent.FLAG_GRANT_READ_URI_PERMISSION)
then the called component will have full access to all content of the provider. You can 
instead set grantUriPermission to false and add subelements.
android:pathPattern="string"
android:pathPrefix="string" />
You then control the exemptions in a more fine-grained way. For both to make sense, you 
obviously must have restrictions set by *permission attributes in effect; otherwise, there is 
nothing you can have exemptions for. The rules for the  element’s 
attributes are as explained earlier: path is for an exact path match, pathPrefix is for 
matching the start of a path, and pathPattern allows for wildcards (X* is for zero to many 
occurrences of any character X, and .* is for zero to many occurrences of any character).
Providing Content for the Search Framework
The Android search framework provides a feature to users to search any data that is 
available to them by whatever means and using whatever data source. We will be talking 
about the search framework in Chapter 
8
; for now it is important to know that content 
providers play a role for the following:

Recent query suggestions

Custom suggestions
For both of them you provide special content provider subclasses and add them to 
AndroidManifest.xml as any other content provider.
Documents Provider
The documents provider is part of the Storage Access Framework (SAF). It allows for a 
document-centric view of data access, and it also exhibits a hierarchical super-structure of 
document directories.

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