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POSynchronizing Calls on Bound Services with Threads
 

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    <p>I got a problem using a <code>BoundService</code> in Android.</p> <p>I've got a wrapper, that works as a client with a <code>BoundService</code>, that should have a send method, that binds to a service, sends a message to it and return an answer returned from the service.</p> <p>It should behave something like this:</p> <pre><code>public Object send(Object toSend) { //bind to service //send the Object //return the answer } </code></pre> <p>I'm still trying to get this to work. I tried to use Threads and synchronized blocks, but i'm still stuck. The code now looks something like this:</p> <pre><code>public class Wrapper{ private static Context context; private Object objToSend; private Object obj = new Object(); private Messenger mService = new Messenger(new Handler()); final Messenger mMessenger = new Messenger(new IncomingHandler()); class IncomingHandler extends Handler { @Override public void handleMessage(Message msg) { synchronized (obj) { obj = msg.obj; obj.notify(); } } } } private ServiceConnection mConnection = new ServiceConnection() { public void onServiceConnected(ComponentName className, IBinder service) { mService = new Messenger(service); Message msg = Message.obtain(); msg.obj = objToSend; msg.replyTo = mMessenger; try { mService.send(msg); } catch (RemoteException e) { e.printStackTrace(); } } public void onServiceDisconnected(ComponentName className) { Log.d(TAG,"Service disconnected, IBinder"); mService = null; } }; public Wrapper(Context callerContext) { context = callerContext; } public void bind(String action) { Intent intent = new Intent(action); context.bindService(intent, mConnection, Context.BIND_AUTO_CREATE); } class MyThread extends Thread { private String action; public MyThread (String action) { this.action = action; } public void run() { bind(action); } } public Object send(Object toSend, String action) { objToSend = toSend; synchronized (obj) { try { new MyThread(action).start(); obj.wait(); } catch (InterruptedException e) { e.printStackTrace(); } return obj; } } } </code></pre> <p>For calling send i tried to use it in a separate Thread, if i don't the onServiceConnected will not be called, although the onBind() of the Service is called.</p> <pre><code>new Thread(){ public void run() { Object obj = new Wrapper(getApplicationContext()).send("test","MyServiceAction"); } }.start(); </code></pre> <p>I'm getting the following Exception on the <code>obj.notify()</code> line.</p> <pre><code>12-15 20:50:10.859: E/AndroidRuntime(22884): Uncaught handler: thread main exiting due to uncaught exception 12-15 20:50:10.859: E/AndroidRuntime(22884): java.lang.IllegalMonitorStateException: object not locked by thread before notify() 12-15 20:50:10.859: E/AndroidRuntime(22884): at java.lang.Object.notify(Native Method) 12-15 20:50:10.859: E/AndroidRuntime(22884): at de.Wrapper$IncomingHandler.handleMessage(Wrapper.java:57) .... </code></pre> <p>Starting mThread before the synchronized-block of the send-method produces the same error.</p>
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