java.lang.Object | |
↳ | android.app.usage.NetworkStats |
Class providing enumeration over buckets of network usage statistics. NetworkStats
objects
are returned as results to various queries in NetworkStatsManager
.
Nested Classes | |||||||||||
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NetworkStats.Bucket | Buckets are the smallest elements of a query result. |
Public Methods | |||||||||||
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Closes the enumeration.
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Fills the recycled bucket with data of the next bin in the enumeration.
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Check if it is possible to ask for a next bucket in the enumeration.
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Protected Methods | |||||||||||
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Invoked when the garbage collector has detected that this instance is no longer reachable.
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Inherited Methods | |||||||||||
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From class
java.lang.Object
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From interface
java.lang.AutoCloseable
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Closes the enumeration. Call this method before this object gets out of scope.
Fills the recycled bucket with data of the next bin in the enumeration.
bucketOut | Bucket to be filled with data. |
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Check if it is possible to ask for a next bucket in the enumeration.
Invoked when the garbage collector has detected that this instance is no longer reachable. The default implementation does nothing, but this method can be overridden to free resources.
Note that objects that override finalize
are significantly more expensive than
objects that don't. Finalizers may be run a long time after the object is no longer
reachable, depending on memory pressure, so it's a bad idea to rely on them for cleanup.
Note also that finalizers are run on a single VM-wide finalizer thread,
so doing blocking work in a finalizer is a bad idea. A finalizer is usually only necessary
for a class that has a native peer and needs to call a native method to destroy that peer.
Even then, it's better to provide an explicit close
method (and implement
Closeable
), and insist that callers manually dispose of instances. This
works well for something like files, but less well for something like a BigInteger
where typical calling code would have to deal with lots of temporaries. Unfortunately,
code that creates lots of temporaries is the worst kind of code from the point of view of
the single finalizer thread.
If you must use finalizers, consider at least providing your own
ReferenceQueue
and having your own thread process that queue.
Unlike constructors, finalizers are not automatically chained. You are responsible for
calling super.finalize()
yourself.
Uncaught exceptions thrown by finalizers are ignored and do not terminate the finalizer thread. See Effective Java Item 7, "Avoid finalizers" for more.
Throwable |
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