Holder for an active container. This container holder holds a container and also manages new versions of the container that may become available (through loading a saved version of the container from disk or from a network refresh).
This holder can be a successful
Result, in which case
getContainer() returns a
non-null container, and
Status.RESULT_SUCCESS, or an
Result in which case
getStatus returns an unsuccessful status.
When a new version of a container becomes available, if a
been registered, it will be called. Any subsequent call to
getContainer will make that
container active, deactivate any previous container, and return the newly-active container. Only
active containers fire tags; tags in non-active containers never fire.
ContainerHolder will download new versions of the container from the network
on a regular basis (approximately every twelve hours), you can make an explicit request to
download a new version with
Nested Class Summary
|interface||ContainerHolder.ContainerAvailableListener||Listener object that is called when a new container is available.|
Public Method Summary
public abstract Container getContainer ()
Returns the last loaded container. If that container is not already active, makes it active, and makes any previously loaded container inactive.
public abstract void refresh ()
Requests a refresh from the network. This call is asynchronous, so the refresh will not occur immediately.
In order to limit the frequency of network communication, the refresh method is throttled.
After you call
refresh(), you need to wait at least 15 minutes before calling
this method again, otherwise, the subsequent call will be a no-op.
public abstract void setContainerAvailableListener (ContainerHolder.ContainerAvailableListener listener)
Sets a listener that will be called when a new container becomes available (whether
in response to an explicit
refresh() call, via the automatic refreshing that occurs,
or as part of the initial loading of the container). That new
container won't become active until
getContainer() is called.
If there is a pending container available when the listener is added, it will be called immediately.
The listener will be called on the the looper of the handler with which the container was loaded, or the main looper if no such handler was provided.
|listener||the listener to register (or