AIDL単純インスタンス

アプリケーションごとに独自のプロセスがあり、プロセス間で相互にアクセスできない.これをアプリケーション砂時計(application sandboxing)といい、アプリケーションが相互にアクセスできるようにAndroidがIPC(interprocess communication protocol)を提供するIPC protocolはパッケージ(marshaling/un marshalingデータ)を整理する必要があるため複雑になる.したがって.AndroidはAIDL(Android Interface Definition Language)を提供し、javaのような文法を使用してIPC軽量級を実現し、AIDLツールがstubの作成を自動的に実現する手順:1.the AIDL interface 2を定義する.RemoteサービスのためにStub 3を実現する.remoteサービスをローカルlocal clientに提供する第一歩:the AIDL interfaceを定義する

package com.marakana;//     
]AIDLinterface IAdditionService {    //      in, out, or inout.     // Primitive    (   int, boolean, etc.)        in.   
int add(in int value1, in int value2);}

ステップ2:remoteサービスのためのStubの実装

/**
*       remote service   Local client   
*/
public class AdditionService extends Service {
  private static final String TAG = "AdditionService";
  
  @Override
  public void onCreate() {
    super.onCreate();
    Log.d(TAG, "onCreate()");
  }
  
  //  remote   

  @Override
  public IBinder onBind(Intent intent) {

    return new IAdditionService.Stub() {
      /**
       * Implementation of the add() method
       */
      public int add(int value1, int value2) throws RemoteException {
        Log.d(TAG, String.format("AdditionService.add(%d, %d)",value1, value2));
        return value1 + value2;
      }

    };
  }

  @Override
  public void onDestroy() {
    super.onDestroy();
    Log.d(TAG, "onDestroy()");
  }
}

ステップ3:remoteサービスをローカルlocal clientに提供servcieでonBind()を実装すると、remoteサービスに接続できます.

public class AIDLDemo extends Activity {
  private static final String TAG = "AIDLDemo";
  IAdditionService service;
  AdditionServiceConnection connection;

  /**
   *          remote service   .  IBinder     ，   Stub    
   *    AIDL   .    asInterface   aild            
   */
  class AdditionServiceConnection implements ServiceConnection {

    public void onServiceConnected(ComponentName name, IBinder boundService) {
       service = IAdditionService.Stub.asInterface((IBinder) boundService);
      Log.d(AIDLDemo.TAG, "onServiceConnected() connected");
      Toast.makeText(AIDLDemo.this, "Service connected", Toast.LENGTH_LONG)
          .show();
    }

    public void onServiceDisconnected(ComponentName name) {
      service = null;
      Log.d(AIDLDemo.TAG, "onServiceDisconnected() disconnected");
      Toast.makeText(AIDLDemo.this, "Service connected", Toast.LENGTH_LONG)
          .show();
    }
  }

  /**  Activity   Service. */
  private void initService() {
    connection = new AdditionServiceConnection();
    Intent i = new Intent();
    i.setClassName("com.marakana", com.marakana.AdditionService.class.getName());
    boolean ret = bindService(i, connection, Context.BIND_AUTO_CREATE);
    Log.d(TAG, "initService() bound with " + ret);
  }

  /**     . */
  private void releaseService() {
    unbindService(connection);
    connection = null;
    Log.d(TAG, "releaseService() unbound.");
  }

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    initService();

    // Setup the UI
    Button buttonCalc = (Button) findViewById(R.id.buttonCalc);

    buttonCalc.setOnClickListener(new OnClickListener() {
      TextView result = (TextView) findViewById(R.id.result);
      EditText value1 = (EditText) findViewById(R.id.value1);
      EditText value2 = (EditText) findViewById(R.id.value2);

      public void onClick(View v) {
        int v1, v2, res = -1;
        v1 = Integer.parseInt(value1.getText().toString());
        v2 = Integer.parseInt(value2.getText().toString());

        try {
          res = service.add(v1, v2);
        } catch (RemoteException e) {
          Log.d(AIDLDemo.TAG, "onClick failed with: " + e);
          e.printStackTrace();
        }
        result.setText(new Integer(res).toString());
      }
    });
  }

  /** Called when the activity is about to be destroyed. */
  @Override
  protected void onDestroy() {
    releaseService();
  }

}

ソース:http://marakana.com/forums/android/examples/48.html
ソース:http://marakana.com/static/tutorials/AIDLDemo.zip