В пикассо такая шняга: private static class CleanupThread extends Thread

{
private final ReferenceQueue<Object> referenceQueue;
private final Handler handler;

CleanupThread(ReferenceQueue<Object> referenceQueue, Handler handler) {
this.referenceQueue = referenceQueue;
this.handler = handler;
setDaemon(true);
setName(THREAD_PREFIX + "refQueue");
}

@Override public void run() {
Process.setThreadPriority(THREAD_PRIORITY_BACKGROUND);
while (true) {
try {
// Prior to Android 5.0, even when there is no local variable, the result from
// remove() & obtainMessage() is kept as a stack local variable.
// We're forcing this reference to be cleared and replaced by looping every second
// when there is nothing to do.
// This behavior has been tested and reproduced with heap dumps.
RequestWeakReference<?> remove =
(RequestWeakReference<?>) referenceQueue.remove(THREAD_LEAK_CLEANING_MS);
Message message = handler.obtainMessage();
if (remove != null) {
message.what = REQUEST_GCED;
message.obj = remove.action;
handler.sendMessage(message);
} else {
message.recycle();
}
} catch (InterruptedException e) {
break;
} catch (final Exception e) {
handler.post(new Runnable() {
@Override public void run() {
throw new RuntimeException(e);
}
});
break;
}
}
}

void shutdown() {
interrupt();
}
}

О, спасибо! Сейчас попробую врубиться