com.bumptech.glide.load.data.mediastore

Class ThumbFetcher

java.lang.Object

com.bumptech.glide.load.data.mediastore.ThumbFetcher

All Implemented Interfaces:

DataFetcher<InputStream>

public class ThumbFetcher
extends Object
implements DataFetcher<InputStream>

A DataFetcher implementation for InputStreams that loads data from thumbnail files obtained from the MediaStore.

Nested Class Summary

Nested classes/interfaces inherited from interface com.bumptech.glide.load.data.DataFetcher

DataFetcher.DataCallback<T>

Method Summary

Modifier and Type	Method and Description
static ThumbFetcher	buildImageFetcher(Context context, Uri uri)
static ThumbFetcher	buildVideoFetcher(Context context, Uri uri)
void	cancel() A method that will be called when a load is no longer relevant and has been cancelled.
void	cleanup() Cleanup or recycle any resources used by this data fetcher.
Class<InputStream>	getDataClass() Returns the class of the data this fetcher will attempt to obtain.
DataSource	getDataSource() Returns the DataSource this fetcher will return data from.
void	loadData(Priority priority, DataFetcher.DataCallback<? super InputStream> callback) Fetch data from which a resource can be decoded.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

buildImageFetcher

public static ThumbFetcher buildImageFetcher(Context context,
                                             Uri uri)

buildVideoFetcher

public static ThumbFetcher buildVideoFetcher(Context context,
                                             Uri uri)

loadData

public void loadData(Priority priority,
                     DataFetcher.DataCallback<? super InputStream> callback)

Description copied from interface: DataFetcher

Fetch data from which a resource can be decoded.

This will always be called on background thread so it is safe to perform long running tasks here. Any third party libraries called must be thread safe (or move the work to another thread) since this method will be called from a thread in a ExecutorService that may have more than one background thread.

You MUST use the DataFetcher.DataCallback once the request is complete. You are free to move the fetch work to another thread and call the callback from there.

This method will only be called when the corresponding resource is not in the cache.

Note - this method will be run on a background thread so blocking I/O is safe.

Specified by:

loadData in interface DataFetcher<InputStream>

Parameters:

priority - The priority with which the request should be completed.

callback - The callback to use when the request is complete

See Also:

where the data retuned will be cleaned up

cleanup

public void cleanup()

Description copied from interface: DataFetcher

Cleanup or recycle any resources used by this data fetcher. This method will be called in a finally block after the data provided by DataFetcher.loadData(com.bumptech.glide.Priority, com.bumptech.glide.load.data.DataFetcher.DataCallback) has been decoded by the ResourceDecoder.

Note - this method will be run on a background thread so blocking I/O is safe.

Specified by:

cleanup in interface DataFetcher<InputStream>

cancel

public void cancel()

Description copied from interface: DataFetcher

A method that will be called when a load is no longer relevant and has been cancelled. This method does not need to guarantee that any in process loads do not finish. It also may be called before a load starts or after it finishes.

The best way to use this method is to cancel any loads that have not yet started, but allow those that are in process to finish since its we typically will want to display the same resource in a different view in the near future.

Note - this method will be run on the main thread so it should not perform blocking operations and should finish quickly.

Specified by:

cancel in interface DataFetcher<InputStream>

getDataClass

@NonNull
public Class<InputStream> getDataClass()

Description copied from interface: DataFetcher

Returns the class of the data this fetcher will attempt to obtain.

Specified by:

getDataClass in interface DataFetcher<InputStream>

getDataSource

@NonNull
public DataSource getDataSource()

Description copied from interface: DataFetcher

Returns the DataSource this fetcher will return data from.

Specified by:

getDataSource in interface DataFetcher<InputStream>