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am 3fa9ce8d: am ca8547b4: Merge "Add notification docs to DocumentsProvider." into klp-dev

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* commit '3fa9ce8dc5540d1df21410d96b97d27196972504':
  Add notification docs to DocumentsProvider.
This commit is contained in:
Jeff Sharkey
2013-10-23 12:27:31 -07:00
committed by Android Git Automerger
parent 43757cc843 3fa9ce8dc5
commit 0491eaf621
1 changed files with 47 additions and 30 deletions
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77
core/java/android/provider/DocumentsProvider.java
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@@ -76,9 +76,8 @@ import java.io.FileNotFoundException;
* only the system can obtain. Applications cannot use a documents provider
* directly; they must go through {@link Intent#ACTION_OPEN_DOCUMENT} or
* {@link Intent#ACTION_CREATE_DOCUMENT} which requires a user to actively
* navigate and select documents. When a user selects documents through that
* UI, the system issues narrow URI permission grants to the requesting
* application.
* navigate and select documents. When a user selects documents through that UI,
* the system issues narrow URI permission grants to the requesting application.
* </p>
* <h3>Documents</h3>
* <p>
@@ -91,8 +90,8 @@ import java.io.FileNotFoundException;
* <p>
* Each document can have different capabilities, as described by
* {@link Document#COLUMN_FLAGS}. For example, if a document can be represented
* as a thumbnail, a provider can set {@link Document#FLAG_SUPPORTS_THUMBNAIL}
* and implement
* as a thumbnail, your provider can set
* {@link Document#FLAG_SUPPORTS_THUMBNAIL} and implement
* {@link #openDocumentThumbnail(String, Point, CancellationSignal)} to return
* that thumbnail.
* </p>
@@ -102,7 +101,7 @@ import java.io.FileNotFoundException;
* single document can be included in multiple directories when responding to
* {@link #queryChildDocuments(String, String[], String)}. For example, a
* provider might surface a single photo in multiple locations: once in a
* directory of locations, and again in a directory of dates.
* directory of geographic locations, and again in a directory of dates.
* </p>
* <h3>Roots</h3>
* <p>
@@ -162,7 +161,7 @@ public abstract class DocumentsProvider extends ContentProvider {
/**
* Create a new document and return its newly generated
* {@link Document#COLUMN_DOCUMENT_ID}. A provider must allocate a new
* {@link Document#COLUMN_DOCUMENT_ID}. You must allocate a new
* {@link Document#COLUMN_DOCUMENT_ID} to represent the document, which must
* not change once returned.
*
@@ -194,16 +193,17 @@ public abstract class DocumentsProvider extends ContentProvider {
}
/**
* Return all roots currently provided. A provider must define at least one
* root to display to users, and it should avoid making network requests to
* keep this request fast.
* Return all roots currently provided. To display to users, you must define
* at least one root. You should avoid making network requests to keep this
* request fast.
* <p>
* Each root is defined by the metadata columns described in {@link Root},
* including {@link Root#COLUMN_DOCUMENT_ID} which points to a directory
* representing a tree of documents to display under that root.
* <p>
* If this set of roots changes, you must call {@link ContentResolver#notifyChange(Uri,
* android.database.ContentObserver)} to notify the system.
* android.database.ContentObserver, boolean)} with
* {@link DocumentsContract#buildRootsUri(String)} to notify the system.
*
* @param projection list of {@link Root} columns to put into the cursor. If
* {@code null} all supported columns should be included.
@@ -229,8 +229,8 @@ public abstract class DocumentsProvider extends ContentProvider {
}
/**
* Return metadata for the single requested document. A provider should
* avoid making network requests to keep this request fast.
* Return metadata for the single requested document. You should avoid
* making network requests to keep this request fast.
*
* @param documentId the document to return.
* @param projection list of {@link Document} columns to put into the
@@ -248,10 +248,17 @@ public abstract class DocumentsProvider extends ContentProvider {
* If your provider is cloud-based, and you have some data cached or pinned
* locally, you may return the local data immediately, setting
* {@link DocumentsContract#EXTRA_LOADING} on the Cursor to indicate that
* your provider is still fetching additional data. Then, when the network
* data is available, you can call {@link ContentResolver#notifyChange(Uri,
* android.database.ContentObserver)} to trigger a requery and return the
* complete contents.
* you are still fetching additional data. Then, when the network data is
* available, you can send a change notification to trigger a requery and
* return the complete contents.
* <p>
* To support change notifications, you must
* {@link Cursor#setNotificationUri(ContentResolver, Uri)} with a relevant
* Uri, such as
* {@link DocumentsContract#buildChildDocumentsUri(String, String)}. Then
* you can call {@link ContentResolver#notifyChange(Uri,
* android.database.ContentObserver, boolean)} with that Uri to send change
* notifications.
*
* @param parentDocumentId the directory to return children for.
* @param projection list of {@link Document} columns to put into the
@@ -289,6 +296,20 @@ public abstract class DocumentsProvider extends ContentProvider {
* <p>
* Only documents may be returned; directories are not supported in search
* results.
* <p>
* If your provider is cloud-based, and you have some data cached or pinned
* locally, you may return the local data immediately, setting
* {@link DocumentsContract#EXTRA_LOADING} on the Cursor to indicate that
* you are still fetching additional data. Then, when the network data is
* available, you can send a change notification to trigger a requery and
* return the complete contents.
* <p>
* To support change notifications, you must
* {@link Cursor#setNotificationUri(ContentResolver, Uri)} with a relevant
* Uri, such as {@link DocumentsContract#buildSearchDocumentsUri(String,
* String, String)}. Then you can call {@link ContentResolver#notifyChange(Uri,
* android.database.ContentObserver, boolean)} with that Uri to send change
* notifications.
*
* @param rootId the root to search under.
* @param query string to match documents against.
@@ -327,17 +348,14 @@ public abstract class DocumentsProvider extends ContentProvider {
/**
* Open and return the requested document.
* <p>
* A provider should return a reliable {@link ParcelFileDescriptor} to
* Your provider should return a reliable {@link ParcelFileDescriptor} to
* detect when the remote caller has finished reading or writing the
* document. A provider may return a pipe or socket pair if the mode is
* exclusively {@link ParcelFileDescriptor#MODE_READ_ONLY} or
* {@link ParcelFileDescriptor#MODE_WRITE_ONLY}, but complex modes like
* {@link ParcelFileDescriptor#MODE_READ_WRITE} require a normal file on
* disk.
* document. You may return a pipe or socket pair if the mode is exclusively
* "r" or "w", but complex modes like "rw" imply a normal file on disk that
* supports seeking.
* <p>
* If a provider blocks while downloading content, it should periodically
* check {@link CancellationSignal#isCanceled()} to abort abandoned open
* requests.
* If you block while downloading content, you should periodically check
* {@link CancellationSignal#isCanceled()} to abort abandoned open requests.
*
* @param documentId the document to return.
* @param mode the mode to open with, such as 'r', 'w', or 'rw'.
@@ -359,10 +377,9 @@ public abstract class DocumentsProvider extends ContentProvider {
* attempting to serve from a local cache if possible. A provider should
* never return images more than double the hinted size.
* <p>
* If a provider performs expensive operations to download or generate a
* thumbnail, it should periodically check
* {@link CancellationSignal#isCanceled()} to abort abandoned thumbnail
* requests.
* If you perform expensive operations to download or generate a thumbnail,
* you should periodically check {@link CancellationSignal#isCanceled()} to
* abort abandoned thumbnail requests.
*
* @param documentId the document to return.
* @param sizeHint hint of the optimal thumbnail dimensions.