public class SyncAdapterType
extends Object
implements Parcelable
java.lang.Object | |
↳ | android.content.SyncAdapterType |
表示SyncAdapterType的值类型。 此对象优先于equals(Object)
和hashCode()
,因此适合用作Map
的密钥
Inherited constants |
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From interface android.os.Parcelable
|
Fields |
|
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public static final Creator<SyncAdapterType> |
CREATOR |
public final String |
accountType |
public final String |
authority |
public final boolean |
isKey |
Public constructors |
|
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SyncAdapterType(String authority, String accountType, boolean userVisible, boolean supportsUploading) |
|
SyncAdapterType(Parcel source) |
Public methods |
|
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boolean |
allowParallelSyncs() |
int |
describeContents() 描述此Parcelable实例的封送表示中包含的特殊对象的种类。 |
boolean |
equals(Object o) 指示其他某个对象是否“等于”这一个。 |
String |
getSettingsActivity() |
int |
hashCode() 返回对象的哈希码值。 |
boolean |
isAlwaysSyncable() 如果为true,那么SyncManager将永远不会向SyncAdapter发出初始化同步,而是会为此同步适配器支持的每个帐户和提供程序自动调用 |
boolean |
isUserVisible() |
static SyncAdapterType |
newKey(String authority, String accountType) |
boolean |
supportsUploading() |
String |
toString() 返回对象的字符串表示形式。 |
void |
writeToParcel(Parcel dest, int flags) 将此对象平铺到一个包裹中。 |
Inherited methods |
|
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From class java.lang.Object
|
|
From interface android.os.Parcelable
|
SyncAdapterType (String authority, String accountType, boolean userVisible, boolean supportsUploading)
Parameters | |
---|---|
authority |
String
|
accountType |
String
|
userVisible |
boolean
|
supportsUploading |
boolean
|
boolean allowParallelSyncs ()
Returns | |
---|---|
boolean |
True if this SyncAdapter supports syncing multiple accounts simultaneously. If false then the SyncManager will take care to only start one sync at a time using this SyncAdapter. |
int describeContents ()
描述此Parcelable实例的封送表示中包含的特殊对象的种类。 例如,如果对象将在writeToParcel(Parcel, int)
的输出中包含writeToParcel(Parcel, int)
,则此方法的返回值必须包含CONTENTS_FILE_DESCRIPTOR
位。
Returns | |
---|---|
int |
a bitmask indicating the set of special object types marshaled by this Parcelable object instance. |
boolean equals (Object o)
指示其他某个对象是否“等于”这一个。
equals
方法在非空对象引用上实现等价关系:
x
, x.equals(x)
should return true
. x
and y
, x.equals(y)
should return true
if and only if y.equals(x)
returns true
. x
, y
, and z
, if x.equals(y)
returns true
and y.equals(z)
returns true
, then x.equals(z)
should return true
. x
and y
, multiple invocations of x.equals(y)
consistently return true
or consistently return false
, provided no information used in equals
comparisons on the objects is modified. x
, x.equals(null)
should return false
. 类equals
方法Object
实现了对象上最可能的等价关系; 也就是说,对于任何非空参考值x
和y
,当且仅当x
和y
引用同一对象( x == y
的值为true
)时,此方法返回true
。
请注意,无论何时覆盖此方法,通常都需要覆盖 hashCode
方法,以维护 hashCode
方法的一般合同,该方法声明相等对象必须具有相同的哈希代码。
Parameters | |
---|---|
o |
Object : the reference object with which to compare. |
Returns | |
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boolean |
true if this object is the same as the obj argument; false otherwise. |
String getSettingsActivity ()
Returns | |
---|---|
String |
The activity to use to invoke this SyncAdapter's settings activity. May be null. |
int hashCode ()
返回对象的哈希码值。 为了散列表的好处而支持此方法,例如由HashMap
提供的HashMap
。
hashCode
的总合同是:
hashCode
method must consistently return the same integer, provided no information used in equals
comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application. equals(Object)
method, then calling the hashCode
method on each of the two objects must produce the same integer result. equals(java.lang.Object)
method, then calling the hashCode
method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables. 尽可能合理实用,由类Object
定义的hashCode方法确实为不同的对象返回不同的整数。 (这通常通过将对象的内部地址转换为整数来实现,但Java TM编程语言不需要此实现技术。)
Returns | |
---|---|
int |
a hash code value for this object. |
boolean isAlwaysSyncable ()
如果为true,那么SyncManager将永远不会向SyncAdapter发出初始化同步,而是自动为该同步适配器支持的每个帐户和提供程序调用 setIsSyncable(android.accounts.Account, String, int)
的值为1。
Returns | |
---|---|
boolean |
true if the SyncAdapter does not require initialization and if it is ok for the SyncAdapter to treat it as syncable automatically. |
SyncAdapterType newKey (String authority, String accountType)
Parameters | |
---|---|
authority |
String
|
accountType |
String
|
Returns | |
---|---|
SyncAdapterType |
String toString ()
返回对象的字符串表示形式。 一般来说, toString
方法返回一个“文本表示”该对象的字符串。 结果应该是一个简洁但内容丰富的表述,对于一个人来说很容易阅读。 建议所有子类重写此方法。
类Object
的toString
方法返回一个字符串,其中包含对象为实例的类的名称,符号字符“ @
”以及对象的哈希代码的无符号十六进制表示形式。 换句话说,这个方法返回一个字符串,其值等于:
getClass().getName() + '@' + Integer.toHexString(hashCode())
Returns | |
---|---|
String |
a string representation of the object. |
void writeToParcel (Parcel dest, int flags)
将此对象平铺到一个包裹中。
Parameters | |
---|---|
dest |
Parcel : The Parcel in which the object should be written. |
flags |
int : Additional flags about how the object should be written. May be 0 or PARCELABLE_WRITE_RETURN_VALUE . |