android.os
Class TokenWatcher

java.lang.Object
  android.os.TokenWatcher

public abstract class TokenWatcher
extends Object

Helper class that helps you use IBinder objects as reference counted tokens. IBinders make good tokens because we find out when they are removed

Constructor Summary

TokenWatcher(Handler h, String tag)
Construct the TokenWatcher

Method Summary

void	acquire(IBinder token, String tag) Record that this token has been acquired.
abstract void	acquired() Called when the number of active tokens goes from 0 to 1.
void	cleanup(IBinder token, boolean unlink)
void	dump()
boolean	isAcquired()
void	release(IBinder token)
abstract void	released() Called when the number of active tokens goes from 1 to 0.

Methods inherited from class java.lang.Object

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

Constructor Detail

TokenWatcher

public TokenWatcher(Handler h,
                    String tag)

Construct the TokenWatcher

Parameters:

h - A handler to call acquired() and released() on. If you don't care, just call it like this, although your thread will have to be a Looper thread. new TokenWatcher(new Handler())

tag - A debugging tag for this TokenWatcher

Method Detail

acquired

public abstract void acquired()

Called when the number of active tokens goes from 0 to 1.

released

public abstract void released()

Called when the number of active tokens goes from 1 to 0.

acquire

public void acquire(IBinder token,
                    String tag)

Record that this token has been acquired. When acquire is called, and the current count is 0, the acquired method is called on the given handler.

Parameters:

token - An IBinder object. If this token has already been acquired, no action is taken.

tag - A string used by the dump() method for debugging, to see who has references.

cleanup

public void cleanup(IBinder token,
                    boolean unlink)

release

public void release(IBinder token)

isAcquired

public boolean isAcquired()

dump

public void dump()