public class

HandlerThread

extends Thread

java.lang.Object
↳	java.lang.Thread
	↳	android.os.HandlerThread

Class Overview

Handy class for starting a new thread that has a looper. The looper can then be used to create handler classes. Note that start() must still be called.

Summary

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Inherited Constants

From class java.lang.Thread

Public Constructors
	HandlerThread(String name)
	HandlerThread(String name, int priority) Constructs a HandlerThread.

Public Methods
Looper	getLooper() This method returns the Looper associated with this thread.
int	getThreadId() Returns the identifier of this thread.
void	run() Calls the `run()` method of the Runnable object the receiver holds.

Protected Methods
void	onLooperPrepared() Call back method that can be explicitly over ridden if needed to execute some setup before Looper loops.

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Inherited Methods

From class java.lang.Thread

static int	activeCount() Returns the number of active threads in the running thread's ThreadGroup and its subgroups.
final void	checkAccess() This method is used for operations that require approval from a SecurityManager.
int	countStackFrames() This method is deprecated. The results of this call were never well defined. To make things worse, it would depend if the Thread was suspended or not, and suspend was deprecated too.
static Thread	currentThread() Returns the instance of Thread that corresponds to the running Thread which calls this method.
void	destroy() This method is deprecated. Not implemented.
static void	dumpStack() Prints a text representation of the stack for this Thread.
static int	enumerate(Thread[] threads) Copies an array with all Threads which are in the same ThreadGroup as the receiver - and subgroups - into the array `threads` passed as parameter.
static Map<Thread, StackTraceElement[]>	getAllStackTraces() Returns the stack traces of all the currently live threads and puts them into the given map.
ClassLoader	getContextClassLoader() Returns the context ClassLoader for the receiver.
static Thread.UncaughtExceptionHandler	getDefaultUncaughtExceptionHandler() Returns the default exception handler that's executed when uncaught exception terminates a thread.
long	getId() Returns the thread's identifier.
final String	getName() Returns the name of the receiver.
final int	getPriority() Returns the priority of the receiver.
StackTraceElement[]	getStackTrace() Returns the current stack trace of the thread.
Thread.State	getState() Returns the current state of the thread for monitoring purposes.
final ThreadGroup	getThreadGroup() Returns the ThreadGroup to which the receiver belongs
Thread.UncaughtExceptionHandler	getUncaughtExceptionHandler() Returns the thread's uncaught exception handler.
static boolean	holdsLock(Object object) Returns whether the current thread has a monitor lock on the specified object.
void	interrupt() Posts an interrupt request to the receiver.
static boolean	interrupted() Returns a `boolean` indicating whether the current Thread ( `currentThread()`) has a pending interrupt request ( `true`) or not (`false`).
final boolean	isAlive() Returns `true` if the receiver has already been started and still runs code (hasn't died yet).
final boolean	isDaemon() Returns a `boolean` indicating whether the receiver is a daemon Thread (`true`) or not (`false`) A daemon Thread only runs as long as there are non-daemon Threads running.
boolean	isInterrupted() Returns a `boolean` indicating whether the receiver has a pending interrupt request (`true`) or not ( `false`)
final void	join() Blocks the current Thread (`Thread.currentThread()`) until the receiver finishes its execution and dies.
final void	join(long millis, int nanos) Blocks the current Thread (`Thread.currentThread()`) until the receiver finishes its execution and dies or the specified timeout expires, whatever happens first.
final void	join(long millis) Blocks the current Thread (`Thread.currentThread()`) until the receiver finishes its execution and dies or the specified timeout expires, whatever happens first.
final void	resume() This method is deprecated. Used with deprecated method suspend()
void	run() Calls the `run()` method of the Runnable object the receiver holds.
void	setContextClassLoader(ClassLoader cl) Set the context ClassLoader for the receiver.
final void	setDaemon(boolean isDaemon) Set if the receiver is a daemon Thread or not.
static void	setDefaultUncaughtExceptionHandler(Thread.UncaughtExceptionHandler handler) Sets the default uncaught exception handler.
final void	setName(String threadName) Sets the name of the receiver.
final void	setPriority(int priority) Sets the priority of the receiver.
void	setUncaughtExceptionHandler(Thread.UncaughtExceptionHandler handler) Sets the default uncaught exception handler.
static void	sleep(long time, int nanos) Causes the thread which sent this message to sleep an interval of time (given in milliseconds).
static void	sleep(long time) Causes the thread which sent this message to sleep an interval of time (given in milliseconds).
synchronized void	start() Starts the new Thread of execution.
final void	stop() This method is deprecated. No replacement.
synchronized final void	stop(Throwable throwable) This method is deprecated. No replacement.
final void	suspend() This method is deprecated. May cause deadlocks.
String	toString() Returns a string containing a concise, human-readable description of the receiver.
static void	yield() Causes the thread which sent this message to yield execution to another Thread that is ready to run.

From class java.lang.Object

Object	clone() Returns a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
boolean	equals(Object o) Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison.
void	finalize() Called by the virtual machine when there are no longer any (non-weak) references to the receiver.
final Class<? extends Object>	getClass() Returns the unique instance of java.lang.Class which represents the class of the receiver.
int	hashCode() Returns an integer hash code for the receiver.
final void	notify() Causes one thread which is `wait` ing on the receiver to be made ready to run.
final void	notifyAll() Causes all threads which are `wait` ing on the receiver to be made ready to run.
String	toString() Returns a string containing a concise, human-readable description of the receiver.
final void	wait(long time, int frac) Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by `notify` or `notifyAll`) or the expiration of the timeout.
final void	wait(long time) Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by `notify` or `notifyAll`) or the expiration of the timeout.
final void	wait() Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by `notify` or `notifyAll`).

From interface java.lang.Runnable

Public Constructors

public HandlerThread (String name)

public HandlerThread (String name, int priority)

Constructs a HandlerThread.

Parameters

priority	The priority to run the thread at. The value supplied must be from Process and not from java.lang.Thread.

Public Methods

public Looper getLooper ()

This method returns the Looper associated with this thread. If this thread not been started or for any reason is isAlive() returns false, this method will return null. If this thread has been started, this method will blocked until the looper has been initialized.

Returns

The looper.

public int getThreadId ()

Returns the identifier of this thread. See Process.myTid().

public void run ()

Calls the run() method of the Runnable object the receiver holds. If no Runnable is set, does nothing.

Protected Methods

protected void onLooperPrepared ()

Call back method that can be explicitly over ridden if needed to execute some setup before Looper loops.

Jan	FEB	Mar
	25
2008	2009	2010

Interfaces

Classes

Exceptions