Model
- The type of Model that we can retrieve data for, e.g. String
.Data
- The type of data that can be opened, e.g. InputStream
.public final class DataUrlLoader<Model,Data> extends Object implements ModelLoader<Model,Data>
See http://www.ietf.org/rfc/rfc2397.txt for a complete description of the 'data' URL scheme.
Briefly, a 'data' URL has the form:
data:[mediatype][;base64],some_data
限定符和类型 | 类和说明 |
---|---|
static interface |
DataUrlLoader.DataDecoder<Data>
Allows decoding a specific type of data from a Data URL String.
|
static class |
DataUrlLoader.StreamFactory<Model>
Factory for loading
InputStream s from data uris. |
ModelLoader.LoadData<Data>
构造器和说明 |
---|
DataUrlLoader(DataUrlLoader.DataDecoder<Data> dataDecoder) |
限定符和类型 | 方法和说明 |
---|---|
ModelLoader.LoadData<Data> |
buildLoadData(Model model,
int width,
int height,
Options options)
Returns a
ModelLoader.LoadData containing a
DataFetcher required to decode the resource
represented by this model, as well as a set of Keys that
identify the data loaded by the DataFetcher as well as an
optional list of alternate keys from which equivalent data can be loaded. |
boolean |
handles(Model model)
Returns true if the given model is a of a recognized type that this loader can probably load.
|
public DataUrlLoader(DataUrlLoader.DataDecoder<Data> dataDecoder)
public ModelLoader.LoadData<Data> buildLoadData(@NonNull Model model, int width, int height, @NonNull Options options)
ModelLoader
ModelLoader.LoadData
containing a
DataFetcher
required to decode the resource
represented by this model, as well as a set of Keys
that
identify the data loaded by the DataFetcher
as well as an
optional list of alternate keys from which equivalent data can be loaded. The
DataFetcher
will not be used if the resource is already cached.
Note - If no valid data fetcher can be returned (for example if a model has a null URL), then it is acceptable to return a null data fetcher from this method.
buildLoadData
在接口中 ModelLoader<Model,Data>
model
- The model representing the resource.width
- The width in pixels of the view or target the resource will be loaded into, or
Target.SIZE_ORIGINAL
to indicate that
the resource should be loaded at its original width.height
- The height in pixels of the view or target the resource will be loaded into, or
Target.SIZE_ORIGINAL
to indicate that
the resource should be loaded at its original height.public boolean handles(@NonNull Model model)
ModelLoader
For example, you may want multiple Uri -> InputStream loaders. One might handle media store Uris, another might handle asset Uris, and a third might handle file Uris etc.
This method is generally expected to do no I/O and complete quickly, so best effort
results are acceptable. ModelLoaders
that return true from this method may
return null
from ModelLoader.buildLoadData(Object, int, int, Options)
handles
在接口中 ModelLoader<Model,Data>