ContentValues
public
final
class
ContentValues
extends Object
implements
Parcelable
java.lang.Object | |
↳ | android.content.ContentValues |
This class is used to store a set of values that the ContentResolver
can process.
Summary
Constants | |
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String |
TAG
|
Inherited constants |
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Fields | |
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public
static
final
Creator<ContentValues> |
CREATOR
|
Public constructors | |
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ContentValues()
Creates an empty set of values using the default initial size |
|
ContentValues(ContentValues from)
Creates a set of values copied from the given set |
|
ContentValues(int size)
Creates an empty set of values using the given initial size |
Public methods | |
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void
|
clear()
Removes all values. |
boolean
|
containsKey(String key)
Returns true if this object has the named value. |
int
|
describeContents()
Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. |
boolean
|
equals(Object object)
Indicates whether some other object is "equal to" this one. |
Object
|
get(String key)
Gets a value. |
Boolean
|
getAsBoolean(String key)
Gets a value and converts it to a Boolean. |
Byte
|
getAsByte(String key)
Gets a value and converts it to a Byte. |
byte[]
|
getAsByteArray(String key)
Gets a value that is a byte array. |
Double
|
getAsDouble(String key)
Gets a value and converts it to a Double. |
Float
|
getAsFloat(String key)
Gets a value and converts it to a Float. |
Integer
|
getAsInteger(String key)
Gets a value and converts it to an Integer. |
Long
|
getAsLong(String key)
Gets a value and converts it to a Long. |
Short
|
getAsShort(String key)
Gets a value and converts it to a Short. |
String
|
getAsString(String key)
Gets a value and converts it to a String. |
int
|
hashCode()
Returns a hash code value for the object. |
boolean
|
isEmpty()
Indicates whether this collection is empty. |
Set<String>
|
keySet()
Returns a set of all of the keys |
void
|
put(String key, Short value)
Adds a value to the set. |
void
|
put(String key, Long value)
Adds a value to the set. |
void
|
put(String key, Double value)
Adds a value to the set. |
void
|
put(String key, Integer value)
Adds a value to the set. |
void
|
put(String key, Boolean value)
Adds a value to the set. |
void
|
put(String key, String value)
Adds a value to the set. |
void
|
put(String key, Float value)
Adds a value to the set. |
void
|
put(String key, byte[] value)
Adds a value to the set. |
void
|
put(String key, Byte value)
Adds a value to the set. |
void
|
putAll(ContentValues other)
Adds all values from the passed in ContentValues. |
void
|
putNull(String key)
Adds a null value to the set. |
void
|
remove(String key)
Remove a single value. |
int
|
size()
Returns the number of values. |
String
|
toString()
Returns a string containing a concise, human-readable description of this object. |
Set<Entry<String, Object>>
|
valueSet()
Returns a set of all of the keys and values |
void
|
writeToParcel(Parcel parcel, int flags)
Flatten this object in to a Parcel. |
Inherited methods | |
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Constants
Fields
Public constructors
ContentValues
public ContentValues ()
Creates an empty set of values using the default initial size
ContentValues
public ContentValues (ContentValues from)
Creates a set of values copied from the given set
Parameters | |
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from |
ContentValues : the values to copy |
ContentValues
public ContentValues (int size)
Creates an empty set of values using the given initial size
Parameters | |
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size |
int : the initial size of the set of values |
Public methods
containsKey
public boolean containsKey (String key)
Returns true if this object has the named value.
Parameters | |
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key |
String : the value to check for |
Returns | |
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boolean |
true if the value is present, false otherwise |
describeContents
public int describeContents ()
Describe the kinds of special objects contained in this Parcelable
instance's marshaled representation. For example, if the object will
include a file descriptor in the output of writeToParcel(android.os.Parcel, int)
,
the return value of this method must include the
CONTENTS_FILE_DESCRIPTOR
bit.
Returns | |
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int |
a bitmask indicating the set of special object types marshaled
by this Parcelable object instance.
Value is either 0 or CONTENTS_FILE_DESCRIPTOR |
equals
public boolean equals (Object object)
Indicates whether some other object is "equal to" this one.
The equals
method implements an equivalence relation
on non-null object references:
- It is reflexive: for any non-null reference value
x
,x.equals(x)
should returntrue
. - It is symmetric: for any non-null reference values
x
andy
,x.equals(y)
should returntrue
if and only ify.equals(x)
returnstrue
. - It is transitive: for any non-null reference values
x
,y
, andz
, ifx.equals(y)
returnstrue
andy.equals(z)
returnstrue
, thenx.equals(z)
should returntrue
. - It is consistent: for any non-null reference values
x
andy
, multiple invocations ofx.equals(y)
consistently returntrue
or consistently returnfalse
, provided no information used inequals
comparisons on the objects is modified. - For any non-null reference value
x
,x.equals(null)
should returnfalse
.
An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.
Parameters | |
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object |
Object : This value may be null . |
Returns | |
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boolean |
true if this object is the same as the obj
argument; false otherwise. |
get
public Object get (String key)
Gets a value. Valid value types are String
, Boolean
,
Number
, and byte[]
implementations.
Parameters | |
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key |
String : the value to get |
Returns | |
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Object |
the data for the value, or null if the value is missing or if null
was previously added with the given key |
getAsBoolean
public Boolean getAsBoolean (String key)
Gets a value and converts it to a Boolean.
Parameters | |
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key |
String : the value to get |
Returns | |
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Boolean |
the Boolean value, or null if the value is missing or cannot be converted |
getAsByte
public Byte getAsByte (String key)
Gets a value and converts it to a Byte.
Parameters | |
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key |
String : the value to get |
Returns | |
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Byte |
the Byte value, or null if the value is missing or cannot be converted |
getAsByteArray
public byte[] getAsByteArray (String key)
Gets a value that is a byte array. Note that this method will not convert any other types to byte arrays.
Parameters | |
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key |
String : the value to get |
Returns | |
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byte[] |
the byte[] value, or null is the value is missing or not a
byte[] |
getAsDouble
public Double getAsDouble (String key)
Gets a value and converts it to a Double.
Parameters | |
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key |
String : the value to get |
Returns | |
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Double |
the Double value, or null if the value is missing or cannot be converted |
getAsFloat
public Float getAsFloat (String key)
Gets a value and converts it to a Float.
Parameters | |
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key |
String : the value to get |
Returns | |
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Float |
the Float value, or null if the value is missing or cannot be converted |
getAsInteger
public Integer getAsInteger (String key)
Gets a value and converts it to an Integer.
Parameters | |
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key |
String : the value to get |
Returns | |
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Integer |
the Integer value, or null if the value is missing or cannot be converted |
getAsLong
public Long getAsLong (String key)
Gets a value and converts it to a Long.
Parameters | |
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key |
String : the value to get |
Returns | |
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Long |
the Long value, or null if the value is missing or cannot be converted |
getAsShort
public Short getAsShort (String key)
Gets a value and converts it to a Short.
Parameters | |
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key |
String : the value to get |
Returns | |
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Short |
the Short value, or null if the value is missing or cannot be converted |
getAsString
public String getAsString (String key)
Gets a value and converts it to a String.
Parameters | |
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key |
String : the value to get |
Returns | |
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String |
the String for the value |
hashCode
public int hashCode ()
Returns a hash code value for the object. This method is
supported for the benefit of hash tables such as those provided by
HashMap
.
The general contract of hashCode
is:
- Whenever it is invoked on the same object more than once during
an execution of a Java application, the
hashCode
method must consistently return the same integer, provided no information used inequals
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. - If two objects are equal according to the
equals
method, then calling thehashCode
method on each of the two objects must produce the same integer result. - It is not required that if two objects are unequal
according to the
equals
method, then calling thehashCode
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.
Returns | |
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int |
a hash code value for this object. |
isEmpty
public boolean isEmpty ()
Indicates whether this collection is empty.
Returns | |
---|---|
boolean |
true iff size == 0 |
keySet
public Set<String> keySet ()
Returns a set of all of the keys
Returns | |
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Set<String> |
a set of all of the keys |
put
public void put (String key, Short value)
Adds a value to the set.
Parameters | |
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key |
String : the name of the value to put |
value |
Short : the data for the value to put |
put
public void put (String key, Long value)
Adds a value to the set.
Parameters | |
---|---|
key |
String : the name of the value to put |
value |
Long : the data for the value to put |
put
public void put (String key, Double value)
Adds a value to the set.
Parameters | |
---|---|
key |
String : the name of the value to put |
value |
Double : the data for the value to put |
put
public void put (String key, Integer value)
Adds a value to the set.
Parameters | |
---|---|
key |
String : the name of the value to put |
value |
Integer : the data for the value to put |
put
public void put (String key, Boolean value)
Adds a value to the set.
Parameters | |
---|---|
key |
String : the name of the value to put |
value |
Boolean : the data for the value to put |
put
public void put (String key, String value)
Adds a value to the set.
Parameters | |
---|---|
key |
String : the name of the value to put |
value |
String : the data for the value to put |
put
public void put (String key, Float value)
Adds a value to the set.
Parameters | |
---|---|
key |
String : the name of the value to put |
value |
Float : the data for the value to put |
put
public void put (String key, byte[] value)
Adds a value to the set.
Parameters | |
---|---|
key |
String : the name of the value to put |
value |
byte : the data for the value to put |
put
public void put (String key, Byte value)
Adds a value to the set.
Parameters | |
---|---|
key |
String : the name of the value to put |
value |
Byte : the data for the value to put |
putAll
public void putAll (ContentValues other)
Adds all values from the passed in ContentValues.
Parameters | |
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other |
ContentValues : the ContentValues from which to copy |
putNull
public void putNull (String key)
Adds a null value to the set.
Parameters | |
---|---|
key |
String : the name of the value to make null |
remove
public void remove (String key)
Remove a single value.
Parameters | |
---|---|
key |
String : the name of the value to remove |
size
public int size ()
Returns the number of values.
Returns | |
---|---|
int |
the number of values |
toString
public String toString ()
Returns a string containing a concise, human-readable description of this object.
Returns | |
---|---|
String |
a printable representation of this object. |
valueSet
public Set<Entry<String, Object>> valueSet ()
Returns a set of all of the keys and values
Returns | |
---|---|
Set<Entry<String, Object>> |
a set of all of the keys and values |
writeToParcel
public void writeToParcel (Parcel parcel, int flags)
Flatten this object in to a Parcel.
Parameters | |
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parcel |
Parcel : The Parcel in which the object should be written.
This value cannot be null . |
flags |
int : Additional flags about how the object should be written.
May be 0 or Parcelable.PARCELABLE_WRITE_RETURN_VALUE .
Value is either 0 or a combination of Parcelable.PARCELABLE_WRITE_RETURN_VALUE , and android.os.Parcelable.PARCELABLE_ELIDE_DUPLICATES |