android.util

Interfaces

AttributeSet

A collection of attributes, as found associated with a tag in an XML document.

Dumpable

Represents an object whose state can be dumped into a PrintWriter.

DumpableContainer

Represents a container that manages dumpables.

Printer

Simple interface for printing text, allowing redirection to various targets.

Classes

ArrayMap

ArrayMap is a generic key->value mapping data structure that is designed to be more memory efficient than a traditional java.util.HashMap.

ArraySet

ArraySet is a generic set data structure that is designed to be more memory efficient than a traditional java.util.HashSet.

AtomicFile

Helper class for performing atomic operations on a file by writing to a new file and renaming it into the place of the original file after the write has successfully completed.

Base64

Utilities for encoding and decoding the Base64 representation of binary data.

Base64InputStream

An InputStream that does Base64 decoding on the data read through it.

Base64OutputStream

An OutputStream that does Base64 encoding on the data written to it, writing the resulting data to another OutputStream.

CloseGuard

CloseGuard is a mechanism for flagging implicit finalizer cleanup of resources that should have been cleaned up by explicit close methods (aka "explicit termination methods" in Effective Java).

Config

DebugUtils

Various utilities for debugging and logging.

DisplayMetrics

A structure describing general information about a display, such as its size, density, and font scaling.

EventLog

Access to the system diagnostic event record.

EventLogTags

FloatMath

Math routines similar to those found in java.lang.Math.

FloatProperty

An implementation of android.util.Property to be used specifically with fields of type float.

Half

The Half class is a wrapper and a utility class to manipulate half-precision 16-bit IEEE 754 floating point data types (also called fp16 or binary16).

IntProperty

An implementation of android.util.Property to be used specifically with fields of type int.

JsonReader

Reads a JSON (RFC 4627) encoded value as a stream of tokens.

JsonWriter

Writes a JSON (RFC 4627) encoded value to a stream, one token at a time.

LayoutDirection

A class for defining layout directions.

Log

API for sending log output.

LogPrinter

Implementation of a android.util.Printer that sends its output to the system log.

LongSparseArray

SparseArray mapping longs to Objects.

LruCache

A cache that holds strong references to a limited number of values.

MonthDisplayHelper

Helps answer common questions that come up when displaying a month in a 6 row calendar grid format.

MutableBoolean

MutableByte

MutableChar

MutableDouble

MutableFloat

MutableInt

MutableLong

MutableShort

Pair

Container to ease passing around a tuple of two objects.

Patterns

Commonly used regular expression patterns.

PrintStreamPrinter

Implementation of a android.util.Printer that sends its output to a java.io.PrintStream.

PrintWriterPrinter

Implementation of a android.util.Printer that sends its output to a java.io.PrintWriter.

Property

A property is an abstraction that can be used to represent a mutable value that is held in a host object. The Property's set(java.lang.Object,java.lang.Object) or get(java.lang.Object) methods can be implemented in terms of the private fields of the host object, or via "setter" and "getter" methods or by some other mechanism, as appropriate.

Range

Immutable class for describing the range of two numeric values.

Rational

An immutable data type representation a rational number.

Size

Immutable class for describing width and height dimensions in pixels.

SizeF

Immutable class for describing width and height dimensions in some arbitrary unit.

SparseArray

SparseArray maps integers to Objects and, unlike a normal array of Objects, its indices can contain gaps.

SparseBooleanArray

SparseBooleanArrays map integers to booleans.

SparseIntArray

SparseIntArrays map integers to integers.

SparseLongArray

SparseLongArrays map integers to longs.

StateSet

State sets are arrays of positive ints where each element represents the state of a android.view.View (e.g. focused, selected, visible, etc.).

StatsLog

StatsLog provides an API for developers to send events to statsd.

StringBuilderPrinter

Implementation of a android.util.Printer that sends its output to a StringBuilder.

TimeUtils

A class containing utility methods related to time zones.

TimingLogger

A utility class to help log timings splits throughout a method call.

TypedValue

Container for a dynamically typed data value.

Xml

XML utility methods.

Exceptions

AndroidException

Base class for all checked exceptions thrown by the Android frameworks.

AndroidRuntimeException

Base class for all unchecked exceptions thrown by the Android frameworks.

Base64DataException

This exception is thrown by Base64InputStream or Base64OutputStream when an error is detected in the data being decoded.

MalformedJsonException

Thrown when a reader encounters malformed JSON.

NoSuchPropertyException

Thrown when code requests a Property on a class that does not expose the appropriate method or field.

TimeFormatException

Enums

JsonToken

A structure, name or value type in a JSON-encoded string.