ContentObserver
abstract class ContentObserver
kotlin.Any | |
↳ | android.database.ContentObserver |
Receives call backs for changes to content. Must be implemented by objects which are added to a ContentObservable
.
Summary
Public constructors | |
---|---|
ContentObserver(handler: Handler!) Creates a content observer. |
Public methods | |
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open Boolean |
Returns true if this observer is interested receiving self-change notifications. |
Unit |
dispatchChange(selfChange: Boolean) Dispatches a change notification to the observer. |
Unit |
dispatchChange(selfChange: Boolean, uri: Uri?) Dispatches a change notification to the observer. |
Unit |
dispatchChange(selfChange: Boolean, uri: Uri?, flags: Int) Dispatches a change notification to the observer. |
Unit |
dispatchChange(selfChange: Boolean, uris: MutableCollection<Uri!>, flags: Int) Dispatches a change notification to the observer. |
open Unit |
This method is called when a content change occurs. |
open Unit |
This method is called when a content change occurs. |
open Unit |
This method is called when a content change occurs. |
open Unit |
onChange(selfChange: Boolean, uris: MutableCollection<Uri!>, flags: Int) This method is called when a content change occurs. |
Public constructors
ContentObserver
ContentObserver(handler: Handler!)
Creates a content observer.
Parameters | |
---|---|
handler |
Handler!: The handler to run #onChange on, or null if none. |
Public methods
deliverSelfNotifications
open fun deliverSelfNotifications(): Boolean
Returns true if this observer is interested receiving self-change notifications. Subclasses should override this method to indicate whether the observer is interested in receiving notifications for changes that it made to the content itself.
Return | |
---|---|
Boolean |
True if self-change notifications should be delivered to the observer. |
dispatchChange
fundispatchChange(selfChange: Boolean): Unit
Deprecated: Callers should migrate towards using a richer overload that provides more details about the change, such as dispatchChange(boolean,java.util.Collection,int)
.
Dispatches a change notification to the observer.
If a Handler
was supplied to the ContentObserver
constructor, then a call to the #onChange method is posted to the handler's message queue. Otherwise, the #onChange method is invoked immediately on this thread.
dispatchChange
fun dispatchChange(
selfChange: Boolean,
uri: Uri?
): Unit
Dispatches a change notification to the observer. Includes the changed content Uri when available.
If a Handler
was supplied to the ContentObserver
constructor, then a call to the #onChange method is posted to the handler's message queue. Otherwise, the #onChange method is invoked immediately on this thread.
Parameters | |
---|---|
selfChange |
Boolean: True if this is a self-change notification. |
uri |
Uri?: The Uri of the changed content. This value may be null . |
dispatchChange
fun dispatchChange(
selfChange: Boolean,
uri: Uri?,
flags: Int
): Unit
Dispatches a change notification to the observer. Includes the changed content Uri when available.
If a Handler
was supplied to the ContentObserver
constructor, then a call to the #onChange method is posted to the handler's message queue. Otherwise, the #onChange method is invoked immediately on this thread.
Parameters | |
---|---|
selfChange |
Boolean: True if this is a self-change notification. |
uri |
Uri?: The Uri of the changed content. This value may be null . |
flags |
Int: Flags indicating details about this change. Value is either 0 or a combination of android.content.ContentResolver#NOTIFY_SYNC_TO_NETWORK , android.content.ContentResolver#NOTIFY_SKIP_NOTIFY_FOR_DESCENDANTS , android.content.ContentResolver#NOTIFY_INSERT , android.content.ContentResolver#NOTIFY_UPDATE , and android.content.ContentResolver#NOTIFY_DELETE |
dispatchChange
fun dispatchChange(
selfChange: Boolean,
uris: MutableCollection<Uri!>,
flags: Int
): Unit
Dispatches a change notification to the observer. Includes the changed content Uris when available.
If a Handler
was supplied to the ContentObserver
constructor, then a call to the #onChange method is posted to the handler's message queue. Otherwise, the #onChange method is invoked immediately on this thread.
Parameters | |
---|---|
selfChange |
Boolean: True if this is a self-change notification. |
uris |
MutableCollection<Uri!>: The Uri of the changed content. This value cannot be null . |
flags |
Int: Flags indicating details about this change. Value is either 0 or a combination of android.content.ContentResolver#NOTIFY_SYNC_TO_NETWORK , android.content.ContentResolver#NOTIFY_SKIP_NOTIFY_FOR_DESCENDANTS , android.content.ContentResolver#NOTIFY_INSERT , android.content.ContentResolver#NOTIFY_UPDATE , and android.content.ContentResolver#NOTIFY_DELETE |
onChange
open fun onChange(selfChange: Boolean): Unit
This method is called when a content change occurs.
Subclasses should override this method to handle content changes.
Parameters | |
---|---|
selfChange |
Boolean: True if this is a self-change notification. |
onChange
open fun onChange(
selfChange: Boolean,
uri: Uri?
): Unit
This method is called when a content change occurs. Includes the changed content Uri when available.
Subclasses should override this method to handle content changes. To ensure correct operation on older versions of the framework that did not provide richer arguments, applications should implement all overloads.
Example implementation:
<code> // Implement the onChange(boolean) method to delegate the change notification to // the onChange(boolean, Uri) method to ensure correct operation on older versions // of the framework that did not have the onChange(boolean, Uri) method. @Override public void onChange(boolean selfChange) { onChange(selfChange, null); } // Implement the onChange(boolean, Uri) method to take advantage of the new Uri argument. @Override public void onChange(boolean selfChange, Uri uri) { // Handle change. } </code>
Parameters | |
---|---|
selfChange |
Boolean: True if this is a self-change notification. |
uri |
Uri?: The Uri of the changed content. This value may be null . |
onChange
open fun onChange(
selfChange: Boolean,
uri: Uri?,
flags: Int
): Unit
This method is called when a content change occurs. Includes the changed content Uri when available.
Subclasses should override this method to handle content changes. To ensure correct operation on older versions of the framework that did not provide richer arguments, applications should implement all overloads.
Parameters | |
---|---|
selfChange |
Boolean: True if this is a self-change notification. |
uri |
Uri?: The Uri of the changed content. This value may be null . |
flags |
Int: Flags indicating details about this change. Value is either 0 or a combination of android.content.ContentResolver#NOTIFY_SYNC_TO_NETWORK , android.content.ContentResolver#NOTIFY_SKIP_NOTIFY_FOR_DESCENDANTS , android.content.ContentResolver#NOTIFY_INSERT , android.content.ContentResolver#NOTIFY_UPDATE , and android.content.ContentResolver#NOTIFY_DELETE |
onChange
open fun onChange(
selfChange: Boolean,
uris: MutableCollection<Uri!>,
flags: Int
): Unit
This method is called when a content change occurs. Includes the changed content Uris when available.
Subclasses should override this method to handle content changes. To ensure correct operation on older versions of the framework that did not provide richer arguments, applications should implement all overloads.
Parameters | |
---|---|
selfChange |
Boolean: True if this is a self-change notification. |
uris |
MutableCollection<Uri!>: The Uris of the changed content. This value cannot be null . |
flags |
Int: Flags indicating details about this change. Value is either 0 or a combination of android.content.ContentResolver#NOTIFY_SYNC_TO_NETWORK , android.content.ContentResolver#NOTIFY_SKIP_NOTIFY_FOR_DESCENDANTS , android.content.ContentResolver#NOTIFY_INSERT , android.content.ContentResolver#NOTIFY_UPDATE , and android.content.ContentResolver#NOTIFY_DELETE |