de.mrapp.android.preference.multithreading

Class AbstractDataLoader<DataType,KeyType,ViewType extends android.view.View,ParamType>

java.lang.Object

de.mrapp.android.preference.multithreading.AbstractDataLoader<DataType,KeyType,ViewType,ParamType>

Type Parameters:

DataType - The type of the data, which should be loaded

KeyType - The type of the keys, which allow to identify the data

ViewType - The type of the views, which are able to show the data

ParamType - The type of parameters, which can optionally be passed to the loader

Direct Known Subclasses:

ColorPreviewLoader

public abstract class AbstractDataLoader<DataType,KeyType,ViewType extends android.view.View,ParamType>
extends java.lang.Object

An abstract base class for all loaders, which allow to asynchronously load data and show it in a view afterwards.

Since:

1.7.0

Constructor Summary

Constructors

Constructor and Description
AbstractDataLoader(android.content.Context context) Creates a new data loader, which allows to asynchronously load data and show it in a view afterwards.

Method Summary

Modifier and Type	Method and Description
protected android.content.Context	getContext() Returns the context, which is used by the data loader.
void	load(KeyType key, ViewType view, ParamType... params) Loads the the data, which corresponds to a specific key, and shows it in a specific view afterwards.
protected abstract DataType	loadData(KeyType key, ParamType... params) The method, which is invoked on implementing subclasses, in order to load the data, which corresponds to a specific key.
protected abstract void	showData(ViewType view, DataType data) The method, which is invoked on implementing subclasses, in order to show data after it has been loaded.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractDataLoader

public AbstractDataLoader(android.content.Context context)

Creates a new data loader, which allows to asynchronously load data and show it in a view afterwards.

Parameters:

context - The context, which should be used by the data loader, as an instance of the class Context. The context may not be null

Method Detail

getContext

protected final android.content.Context getContext()

Returns the context, which is used by the data loader.

Returns:

The context, which is used by the data loader, as an instance of the class Context

loadData

protected abstract DataType loadData(KeyType key,
                                     ParamType... params)

The method, which is invoked on implementing subclasses, in order to load the data, which corresponds to a specific key.

Parameters:

key - The key of the data, which should be loaded, as an instance of the generic type KeyType. The key may not be null

params - An array, which may contain optional parameters, as an array of the generic type ParamType

Returns:

The data, which has been loaded, as an instance of the generic type DataType

showData

protected abstract void showData(ViewType view,
                                 DataType data)

The method, which is invoked on implementing subclasses, in order to show data after it has been loaded.

Parameters:

view - The view, which should be used to show the data after it has been loaded, as an instance of the generic type ViewType. The view may not be null

data - The data, which should be shown, as an instance of the generic type DataType. The data may not be null

load

@SafeVarargs
public final void load(KeyType key,
                                    ViewType view,
                                    ParamType... params)

Loads the the data, which corresponds to a specific key, and shows it in a specific view afterwards. If the data has already been loaded, it will be retrieved from the cache in order to enhance the performance.

Parameters:

key - The key of the data, which should be loaded, as an instance of the generic type KeyType. The key may not be null

view - The view, which should be used to show the data after it has been loaded, as an instance of the generic type ViewType. The view may not be null

params - An array, which may contain optional parameters, as an array of the generic type ParamType