Android Interprocess Commuincation

This deck comes with an article:
http://blog.shadark.com/2017/01/18/android-interprocess-communication/

Transcript

1. Android Interprocess Communication (IPC)
2. Services
3. Declaring a service in the manifest <?xml version="1.0" encoding="utf-8"?> <manifest ... > ... <application ... > <service android:name=".ExampleService" /> ... </application> </manifest>
4. • Start Service • Bind Service
5. Start Service Intent intent = new Intent(getActivity(), ShadowsocksService.class); intent.setAction(Constants.Action.SERVICE); connection = new ShadowsocksServiceConnection(); getActivity().bindService(intent, connection, Context.BIND_AUTO_CREATE); getActivity().startService(intent);
6. Start Service Intent intent = new Intent(getActivity(), ShadowsocksService.class); intent.setAction(Constants.Action.SERVICE); connection = new ShadowsocksServiceConnection(); getActivity().bindService(intent, connection, Context.BIND_AUTO_CREATE); getActivity().startService(intent);
7. Bind Service Intent intent = new Intent(getActivity(), ShadowsocksService.class); intent.setAction(Constants.Action.SERVICE); connection = new ShadowsocksServiceConnection(); getActivity().bindService(intent, connection, Context.BIND_AUTO_CREATE); getActivity().startService(intent);
8. Bind Service Intent intent = new Intent(getActivity(), ShadowsocksService.class); intent.setAction(Constants.Action.SERVICE); connection = new ShadowsocksServiceConnection(); getActivity().bindService(intent, connection, Context.BIND_AUTO_CREATE); getActivity().startService(intent);
9. Stop • Start Service stopService() or stopSelf() • Bind Service unbindService()
10. Android Interface Definition language (AIDL)
11. AIDL interface ISocketService { int getState(); oneway void registerCallback(out ISocketServiceCallback callback); oneway void unregisterCallback(in ISocketServiceCallback callback); oneway void runShadowSocks(inout Config config); }
12. AIDL public static com.shadark.app.aidl.ISocketService asInterface(android.os.IBinder obj) { if ((obj == null)) { return null; } android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR); if (((iin != null) && (iin instanceof com.shadark.app.aidl.ISocketService))) { return ((com.shadark.app.aidl.ISocketService) iin); } return new com.shadark.app.aidl.ISocketService.Stub.Proxy(obj); }
13. AIDL public static com.shadark.app.aidl.ISocketService asInterface(android.os.IBinder obj) { if ((obj == null)) { return null; } android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR); if (((iin != null) && (iin instanceof com.shadark.app.aidl.ISocketService))) { return ((com.shadark.app.aidl.ISocketService) iin); } return new com.shadark.app.aidl.ISocketService.Stub.Proxy(obj); }
14. AIDL public static com.shadark.app.aidl.ISocketService asInterface(android.os.IBinder obj) { if ((obj == null)) { return null; } android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR); if (((iin != null) && (iin instanceof com.shadark.app.aidl.ISocketService))) { return ((com.shadark.app.aidl.ISocketService) iin); } return new com.shadark.app.aidl.ISocketService.Stub.Proxy(obj); }
15. AIDL public static com.shadark.app.aidl.ISocketService asInterface(android.os.IBinder obj) { if ((obj == null)) { return null; } android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR); if (((iin != null) && (iin instanceof com.shadark.app.aidl.ISocketService))) { return ((com.shadark.app.aidl.ISocketService) iin); } return new com.shadark.app.aidl.ISocketService.Stub.Proxy(obj); }
16. AIDL Service private ISocketService.Stub mBinder = new ISocketService.Stub() { @Override public int getState() throws RemoteException { return mState; } . . . }
17. AIDL Service private ISocketService.Stub mBinder = new ISocketService.Stub() { @Override public int getState() throws RemoteException { return mState; } . . . } @Override public IBinder onBind(Intent intent) { return mBinder; }
18. AIDL Service private ISocketService.Stub mBinder = new ISocketService.Stub() { @Override public int getState() throws RemoteException { return mState; } . . . } @Override public IBinder onBind(Intent intent) { return mBinder; }
19. AIDL Client @Override public void onServiceConnected(ComponentName name, IBinder binder) { try { mBinder = binder; binder.linkToDeath(SocketServiceManager.this, 0); mSocketService = ISocketService.Stub.asInterface(binder); registerCallback(); mCallback.onServiceConnected(); } catch (RemoteException e) { LogUtils.e(TAG, "onServiceConnected: " + e.getMessage()); } }
20. AIDL Client @Override public void onServiceConnected(ComponentName name, IBinder binder) { try { mBinder = binder; binder.linkToDeath(SocketServiceManager.this, 0); mSocketService = ISocketService.Stub.asInterface(binder); registerCallback(); mCallback.onServiceConnected(); } catch (RemoteException e) { LogUtils.e(TAG, "onServiceConnected: " + e.getMessage()); } }
21. Handle Bind Death @Override public void onServiceConnected(ComponentName name, IBinder binder) { try { mBinder = binder; binder.linkToDeath(SocketServiceManager.this, 0); mSocketService = ISocketService.Stub.asInterface(binder); registerCallback(); mCallback.onServiceConnected(); } catch (RemoteException e) { LogUtils.e(TAG, "onServiceConnected: " + e.getMessage()); } }
22. Handle Bind Death @Override public void onServiceConnected(ComponentName name, IBinder binder) { try { mBinder = binder; binder.linkToDeath(SocketServiceManager.this, 0); mSocketService = ISocketService.Stub.asInterface(binder); registerCallback(); mCallback.onServiceConnected(); } catch (RemoteException e) { LogUtils.e(TAG, "onServiceConnected: " + e.getMessage()); } }
23. Handle Bind Death @Override public void onServiceDisconnected(ComponentName name) { unregisterCallback(); mCallback.onServiceDisconnected(); if (null != mBinder) { mBinder.unlinkToDeath(this, 0); mBinder = null; } }
24. Handle Bind Death @Override public void onServiceDisconnected(ComponentName name) { unregisterCallback(); mCallback.onServiceDisconnected(); if (null != mBinder) { mBinder.unlinkToDeath(this, 0); mBinder = null; } }
25. Client Callback final protected RemoteCallbackList<ITaskCallback> callbacks = new RemoteCallbackList<>();
26. Client Callback final protected RemoteCallbackList<ITaskCallback> callbacks = new RemoteCallbackList<>(); public void registerCallback(ITaskCallback cb) { if (cb != null) { mCallbacks.register(cb); } } public void unregisterCallback(ITaskCallback cb) { if(cb != null) { mCallbacks.unregister(cb); } }
27. Client Callback final protected RemoteCallbackList<ITaskCallback> callbacks = new RemoteCallbackList<>(); public void registerCallback(ITaskCallback cb) { if (cb != null) { mCallbacks.register(cb); } } public void unregisterCallback(ITaskCallback cb) { if(cb != null) { mCallbacks.unregister(cb); } }
28. Client Callback final protected RemoteCallbackList<ITaskCallback> callbacks = new RemoteCallbackList<>(); public void registerCallback(ITaskCallback cb) { if (cb != null) { mCallbacks.register(cb); } } public void unregisterCallback(ITaskCallback cb) { if(cb != null) { mCallbacks.unregister(cb); } }
29. Client Callback public void callback(int val) { final int N = mCallbacks.beginBroadcast(); for (int i = 0; i < N; i++) { try { mCallbacks.getBroadcastItem(i).actionPerformed(val); } catch (RemoteException e) { // The RemoteCallbackList will take care of removing // the dead object for us. } } mCallbacks.finishBroadcast(); }
30. Client Callback public void callback(int val) { final int N = mCallbacks.beginBroadcast(); for (int i = 0; i < N; i++) { try { mCallbacks.getBroadcastItem(i).actionPerformed(val); } catch (RemoteException e) { // The RemoteCallbackList will take care of removing // the dead object for us. } } mCallbacks.finishBroadcast(); }
31. Messenger (Service) class IncomingHandler extends Handler { @Override public void handleMessage(Message msg) { switch (msg.what) { case MSG_REGISTER_CLIENT: mClients.add(msg.replyTo); break; case MSG_UNREGISTER_CLIENT: mClients.remove(msg.replyTo); break; ... default: super.handleMessage(msg); } } }
32. Messenger (Service) final Messenger mMessenger = new Messenger(new IncomingHandler()); class IncomingHandler extends Handler { @Override public void handleMessage(Message msg) { switch (msg.what) { case MSG_REGISTER_CLIENT: mClients.add(msg.replyTo); break; case MSG_UNREGISTER_CLIENT: mClients.remove(msg.replyTo); break; ... default: super.handleMessage(msg); } } }
33. Messenger (Service) final Messenger mMessenger = new Messenger(new IncomingHandler()); class IncomingHandler extends Handler { @Override public void handleMessage(Message msg) { switch (msg.what) { case MSG_REGISTER_CLIENT: mClients.add(msg.replyTo); break; case MSG_UNREGISTER_CLIENT: mClients.remove(msg.replyTo); break; ... default: super.handleMessage(msg); } } }
34. Messenger (Service) final Messenger mMessenger = new Messenger(new IncomingHandler());
35. Messenger Service final Messenger mMessenger = new Messenger(new IncomingHandler()); @Override public IBinder onBind(Intent intent) { return mMessenger.getBinder(); }
36. Messenger Service final Messenger mMessenger = new Messenger(new IncomingHandler()); @Override public IBinder onBind(Intent intent) { return mMessenger.getBinder(); }
37. Messenger Client class IncomingHandler extends Handler { @Override public void handleMessage(Message msg) { switch (msg.what) { case MessengerService.MSG_SET_VALUE: mCallbackText.setText("Received from service: " + msg.arg1); break; default: super.handleMessage(msg); } } }
38. Messenger Client class IncomingHandler extends Handler { @Override public void handleMessage(Message msg) { switch (msg.what) { case MessengerService.MSG_SET_VALUE: mCallbackText.setText("Received from service: " + msg.arg1); break; default: super.handleMessage(msg); } } } final Messenger mMessenger = new Messenger(new IncomingHandler());
39. Messenger Client class IncomingHandler extends Handler { @Override public void handleMessage(Message msg) { switch (msg.what) { case MessengerService.MSG_SET_VALUE: mCallbackText.setText("Received from service: " + msg.arg1); break; default: super.handleMessage(msg); } } } final Messenger mMessenger = new Messenger(new IncomingHandler());
40. Messenger Client final Messenger mMessenger = new Messenger(new IncomingHandler());
41. Messenger Client final Messenger mMessenger = new Messenger(new IncomingHandler()); public void onServiceConnected(ComponentName className, IBinder service) { mService = new Messenger(service); try { Message msg = Message.obtain(null, MessengerService.MSG_REGISTER_CLIENT); msg.replyTo = mMessenger; mService.send(msg); // Give it some value as an example. msg = Message.obtain(null, MessengerService.MSG_SET_VALUE, this.hashCode(), 0); mService.send(msg); } catch (RemoteException e) { } }
42. Messenger Client final Messenger mMessenger = new Messenger(new IncomingHandler()); public void onServiceConnected(ComponentName className, IBinder service) { mService = new Messenger(service); try { Message msg = Message.obtain(null, MessengerService.MSG_REGISTER_CLIENT); msg.replyTo = mMessenger; mService.send(msg); // Give it some value as an example. msg = Message.obtain(null, MessengerService.MSG_SET_VALUE, this.hashCode(), 0); mService.send(msg); } catch (RemoteException e) { } }
43. Messenger Client final Messenger mMessenger = new Messenger(new IncomingHandler()); public void onServiceConnected(ComponentName className, IBinder service) { mService = new Messenger(service); try { Message msg = Message.obtain(null, MessengerService.MSG_REGISTER_CLIENT); msg.replyTo = mMessenger; mService.send(msg); // Give it some value as an example. msg = Message.obtain(null, MessengerService.MSG_SET_VALUE, this.hashCode(), 0); mService.send(msg); } catch (RemoteException e) { } }