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| java.lang.Object | |
| ↳ | android.content.ContentProviderClient |
The public interface object used to interact with a ContentProvider. This is obtained by
calling acquireContentProviderClient(Uri). This object must be released
using release() in order to indicate to the system that the ContentProvider is
no longer needed and can be killed to free up resources.
Note that you should generally create a new ContentProviderClient instance
for each thread that will be performing operations. Unlike
ContentResolver, the methods here such as query(Uri, String[], String, String[], String) and
openFile(Uri, String) are not thread safe -- you must not call
release() on the ContentProviderClient those calls are made from
until you are finished with the data they have returned.
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Invoked when the garbage collector has detected that this instance is no longer reachable.
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From class
java.lang.Object
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Get a reference to the ContentProvider that is associated with this
client. If the ContentProvider is running in a different process then
null will be returned. This can be used if you know you are running in the same
process as a provider, and want to get direct access to its implementation details.
ContentProvider is local, returns it.
Otherwise returns null.
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See ContentProvider.openAssetFile.
Note that this does not
take care of non-content: URIs such as file:. It is strongly recommended
you use the ContentResolver.openAssetFileDescriptor API instead.
See ContentProvider.openAssetFile.
Note that this does not
take care of non-content: URIs such as file:. It is strongly recommended
you use the ContentResolver.openAssetFileDescriptor API instead.
See ContentProvider.openFile. Note that
this does not
take care of non-content: URIs such as file:. It is strongly recommended
you use the ContentResolver.openFileDescriptor API instead.
See ContentProvider.openFile. Note that
this does not
take care of non-content: URIs such as file:. It is strongly recommended
you use the ContentResolver.openFileDescriptor API instead.
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Call this to indicate to the system that the associated ContentProvider is no
longer needed by this ContentProviderClient.
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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.
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