android – AIDL和Messenger同时出现

概述我尝试编写一个关于如何同时使用AIDL和Messenger的演示,但是我有一个错误,我不知道原因. MessengerDEMOActivity.java public class MessengerDEMOActivity extends Activity { /** Called when the activity is first created. */ private Me 我尝试编写一个关于如何同时使用AIDL和Messenger的演示,但是我有一个错误,我不知道原因.

MessengerDEMOActivity.java

public class MessengerDEMOActivity extends Activity {    /** Called when the activity is first created. */    private MessengerDEMOServiceConnection mdsconnection = null;    private Messenger mMessenger = null;    class IncomingHandler extends Handler {            public voID handleMessage(Message msg) {            Bundle b = msg.getData();            System.out.println("MESSENGER! " + b.getString("MESSENGER"));        }    }    @OverrIDe    public voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.main);        mMessenger = new Messenger(new IncomingHandler());        mdsconnection = new MessengerDEMOServiceConnection(mMessenger);        Intent intent = new Intent();        intent.putExtra("ID","AIDL");        intent.setClassname("messenger.demo",messenger.demo.MessengerDEMOService.class.getname());        bindService(intent,mdsconnection,Context.BIND_auto_CREATE);    }}

MessengerDEMOServiceConnection.java

public class MessengerDEMOServiceConnection implements ServiceConnection {    private IMessengerDEMOService service = null;    private Messenger mMessenger = null;    public MessengerDEMOServiceConnection(Messenger mMessenger) {        super();        System.out.println("MessengerDEMOServiceConnection SocketServiceConnection()");        this.mMessenger = mMessenger;    }    public voID onServiceConnected(Componentname name,IBinder boundService) {        System.out.println("MessengerDEMOServiceConnection onServiceConnected()");        service = IMessengerDEMOService.Stub.asInterface((IBinder) boundService);        Messenger mService = new Messenger(boundService);        Message msg = Message.obtain(null,5);        msg.replyTo = mMessenger;        try {            mService.send(msg); // line 31        } catch (remoteexception e1) {            // Todo auto-generated catch block            e1.printstacktrace();        }        try {            service.foo();        } catch (remoteexception e) {            // Todo auto-generated catch block            e.printstacktrace();        }    }    public voID onServicedisconnected(Componentname name) {        System.out.println("MessengerDEMOServiceConnection onServicedisconnected()");        service = null;    }}

MessengerDEMOService.java

public class MessengerDEMOService extends Service {    private Messenger mMessenger = null;    class IncomingHandler extends Handler {        @OverrIDe        public voID handleMessage(Message msg) {            System.out.println("MessengerDEMOService IncomingHandler");            Messenger activityMessenger = msg.replyTo;            Message m = new Message();            Bundle b = new Bundle();            b.putString("MESSENGER","blablabla");            m.setData(b);            try {                activityMessenger.send(m);            } catch (remoteexception e) {                // Todo auto-generated catch block                e.printstacktrace();            }        }    }    public voID onCreate() {        System.out.println("MessengerDEMOService onCreate");        mMessenger = new Messenger(new IncomingHandler());    }    public IBinder onBind(Intent intent) {        System.out.println("MessengerDEMOService onBind()");        if (intent.getExtras().getString("ID").equals("AIDL") == true) {            System.out.println("MessengerDEMOService onBind() AIDL");            return new IMessengerDEMOService.Stub() {                public voID foo() {                    System.out.println("MessengerDEMOService onBind() foo()");                }            };        }        System.out.println("MessengerDEMOService onBind() MESSENGER");        return mMessenger.getBinder();    }}

并且堆栈跟踪：

12-27 16:42:29.412: INFO/System.out(832): MessengerDEMOServiceConnection SocketServiceConnection()12-27 16:42:29.442: INFO/System.out(832): MessengerDEMOService onCreate12-27 16:42:29.452: INFO/System.out(832): MessengerDEMOService onBind()12-27 16:42:29.452: INFO/System.out(832): MessengerDEMOService onBind() AIDL12-27 16:42:29.542: INFO/System.out(832): MessengerDEMOServiceConnection onServiceConnected()12-27 16:42:29.572: WARN/Parcel(832): **** enforceInterface() expected 'messenger.demo.IMessengerDEMOService' but read 'androID.os.IMessenger'12-27 16:42:29.572: DEBUG/AndroIDRuntime(832): Shutting down VM12-27 16:42:29.572: WARN/dalvikvm(832): threadID=1: thread exiting with uncaught exception (group=0x4001d800)12-27 16:42:29.592: ERROR/AndroIDRuntime(832): FATAL EXCEPTION: main12-27 16:42:29.592: ERROR/AndroIDRuntime(832): java.lang.SecurityException: Binder invocation to an incorrect interface12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at androID.os.Parcel.enforceInterface(Native Method)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at messenger.demo.IMessengerDEMOService$Stub.onTransact(IMessengerDEMOService.java:49)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at androID.os.Binder.transact(Binder.java:249)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at androID.os.IMessenger$Stub$Proxy.send(IMessenger.java:89)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at androID.os.Messenger.send(Messenger.java:50)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at messenger.demo.MessengerDEMOServiceConnection.onServiceConnected(MessengerDEMOServiceConnection.java:31)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at androID.app.ActivityThread$PackageInfo$Servicedispatcher.doConnected(ActivityThread.java:1247)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at androID.app.ActivityThread$PackageInfo$Servicedispatcher$runconnection.run(ActivityThread.java:1264)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at androID.os.Handler.handleCallback(Handler.java:587)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at androID.os.Handler.dispatchMessage(Handler.java:92)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at androID.os.Looper.loop(Looper.java:123)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at androID.app.ActivityThread.main(ActivityThread.java:4627)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at java.lang.reflect.Method.invokeNative(Native Method)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at java.lang.reflect.Method.invoke(Method.java:521)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:626)12-27 16:42:29.592: ERROR/AndroIDRuntime(832):     at dalvik.system.NativeStart.main(Native Method)

没有这些代码,代码就可以了：

Message msg = Message.obtain(null,5);            msg.replyTo = mMessenger;            try {                mService.send(msg); // line 31            } catch (remoteexception e1) {                // Todo auto-generated catch block                e1.printstacktrace();            }

它可以在没有AIDL的情况下工作,并且可以“单独”使用AIDL.我可以多次拨打onBinder吗？

解决方法

Can I call the onBinder more than one time?

简单回答：是的.实际上,如果两个不同的应用程序连接到同一服务,则会发生这种情

那么为什么这不起作用呢？因为您使用两个不同的接口进行通信.

详细情况：

>您连接到服务(AIDL)
>您尝试通过信使发送消息
> AndroID通过AIDL将此消息发送给服务
>首先要做的是,给定的接口匹配(通过比较接口描述符)(有关详细信息,请参阅Stub.onTransact)
> AndroID注意到这些接口不匹配并抛出SecurityException

没有抛出remoteexception,因为尚未调用send()方法.

轻松修复：捕获SecurityException.但我会考虑这种极端糟糕的风格(一如既往,当您的应用程序逻辑在异常时进行中继).

不太容易解决：
为此,两个接口都需要具有相同的接口描述符(在生成的AIDL类中的Stub.DESCRIPTOR中定义).但是你需要自己实现IPC的代理/存根(不是那么糟糕).

另一个修复：创建两个ServiceConnection类.一个负责AIDL,一个负责信使.

最佳修复(IMO)：一次确定一种技术.您的解决方案感觉就像开车(单独)同时驾驶两辆车一样.

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