The hander synchronization technique utilizes post messages to be completed at the end, enabling synchronization. The key to see the realization of Waitdone. Thin camera app with face.

    private void Testwait () {handlerthread ht = new Handlerthread ("Camera Handler Thread");        Ht.start ();        Mcamerahandler = new Camerahandler (Ht.getlooper ());        Mcamerahandler.obtainmessage (Open_camera, 1, 0). Sendtotarget ();        boolean ret = false;        ret = Mcamerahandler.waitdone ();    LOG.V (TAG, "ret =" + ret);        } private class Camerahandler extends Handler {camerahandler (Looper Looper) {super (Looper); }/** * Waits for all the {@code Message} and {@code Runnable} currently in the queue * is PR         Ocessed.         * * @return {@code false} if the wait was interrupted, {@code true} otherwise.            */Public Boolean waitdone () {Final object waitdonelock = new Object ();                    Final Runnable unlockrunnable = new Runnable () {@Override public void run () { Synchronized (Waitdonelock) {log.v (TAG, "Notifyall start ");                    Waitdonelock.notifyall ();            }                }            };                Synchronized (Waitdonelock) {mcamerahandler.post (unlockrunnable);                    try {log.v (TAG, "Start Wait");                Waitdonelock.wait ();                    } catch (Interruptedexception ex) {LOG.V (TAG, "Waitdone interrupted");                return false;        }} return true;  }/** * This method is does not deal with the API level check.         Everyone should * Check first for supported operations before sending message to this handler.                */@Override public void Handlemessage (Final Message msg) {switch (msg.what) {  Case Open_camera:try {log.v (TAG, "Start sleep 4s"); Thread.Sleep (4000); LOG.V (TAG, "End sleep 4s");     } catch (Interruptedexception e) {//TODO auto-generated catch block E.printstacktrace ();}               Default:}}} 

The hander synchronization technique utilizes post messages to be completed at the end, enabling synchronization. The key to see the realization of Waitdone. Thin camera app with face.