程序包 ohos.agp.database

类 DataSetSubscriber

java.lang.Object

ohos.agp.database.DataSetSubscriber

public abstract class DataSetSubscriber
extends Object

An abstract class that defines the behavior to be observed.

This class defines the data behavior that an subscriber needs to observe, such as data changes and invalidated data. You can override the methods in this class to make responses to the data changes.

从以下版本开始:

3

构造器概要

构造器

构造器	说明
DataSetSubscriber()

方法概要

限定符和类型	方法	说明
void	onChanged()	Monitors data changes.
void	onInvalidated()	Monitors invalid data.
void	onItemChanged(int position)	Monitors data item changes.
void	onItemInserted(int position)	Monitors data item inserted.
void	onItemRangeChanged(int startPos, int countItems)	Monitors data items range changed.
void	onItemRangeInserted(int startPos, int countItems)	Monitors data data items range inserted.
void	onItemRangeRemoved(int startPos, int countItems)	Monitors data items range removed.
void	onItemRemoved(int position)	Monitors data item removed.

从类继承的方法 java.lang.Object

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

构造器详细资料

DataSetSubscriber

public DataSetSubscriber()

方法详细资料

onChanged

public void onChanged()

Monitors data changes.

This method can be called when data changes.

onInvalidated

public void onInvalidated()

Monitors invalid data.

This method can be called when data becomes invalid.

onItemChanged

public void onItemChanged(int position)

Monitors data item changes.

This method can be called when one data item changes.

参数:

position - Indicates the position of the item in the dataset.

从以下版本开始:

4

onItemInserted

public void onItemInserted(int position)

Monitors data item inserted.

This method can be called when one data item inserted.

参数:

position - Indicates the position of the item in the dataset.

从以下版本开始:

4

onItemRemoved

public void onItemRemoved(int position)

Monitors data item removed.

This method can be called when one data item removed.

参数:

position - Indicates the position of the item in the dataset.

从以下版本开始:

4

onItemRangeChanged

public void onItemRangeChanged(int startPos,
                               int countItems)

Monitors data items range changed.

This method can be called when data items range changed.

参数:

startPos - Indicates the start position of the item in the dataset.

countItems - Indicates the number of affected items in the dataset.

从以下版本开始:

4

onItemRangeInserted

public void onItemRangeInserted(int startPos,
                                int countItems)

Monitors data data items range inserted.

This method can be called when data items range inserted.

参数:

startPos - Indicates the start position of the item in the dataset.

countItems - Indicates the number of affected items in the dataset.

从以下版本开始:

4

onItemRangeRemoved

public void onItemRangeRemoved(int startPos,
                               int countItems)

Monitors data items range removed.

This method can be called when data items range removed.

参数:

startPos - Indicates the start position of the item in the dataset.

countItems - Indicates the number of affected items in the dataset.

从以下版本开始:

4