つうしんモード

1.binder+コールバック(listener)

主な考え方:Activityはインスタンスをサービスに転送し、コールバックを利用してUIを更新する.

2. binder + Handler

主な考え方:サービスはActivityのHandlerオブジェクトを持ち、サービスはこのHandler send messageに向かうことで通信の目的を達成する.

3.ブロードキャスト(推奨LocalBroadcastManager)

主な考え方:システムのLocalBroadcastManager、Service send message、Activity receive messageを利用する;

4.オープンソースコンポーネント（EventBus，otto）

主な考え方:反射や注釈で登録クラスの登録を実現し、現在のレジストリを巡り、keyでクエリーを行い、dispatchし、対応するイベント処理方法を呼び出す.(オープンソースフレームワークの実装によって異なります)

5. AIDL

主な考え方://ODO

まとめ

現在、Androidコンポーネント間の主流の通信方式は、上記の5つのうち、どちらがプロジェクトに適しているか、考慮すべき適用状況があります.

プロセス内通信かプロセス間通信か

一対一通信か、それとも一対多

一方向か双方向か

性能

その他(セキュリティ、コード可読性、実現複雑性)など;

ソースコード（通信方式1、2、3、4 Demo）

public class MainActivity extends Activity implements View.OnClickListener, OnProgressListener, Handler.Callback{

private DownloadService mDownloadService;
private ProgressBar mProgressBar;

private LocalBroadcastManager mLocalBroadcastManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mProgressBar = (ProgressBar)findViewById(R.id.progressBar);
    findViewById(R.id.button1).setOnClickListener(this);
    findViewById(R.id.button2).setOnClickListener(this);

    Intent intent = new Intent("com.example.downloadservice");
    bindService(intent, serviceConnection, BIND_AUTO_CREATE);

    mLocalBroadcastManager = LocalBroadcastManager.getInstance(this);

    EventBus.getDefault().register(this);
}

@Override
protected void onResume() {
    super.onResume();

    mLocalBroadcastManager.registerReceiver(mBroadcastReceiver, new IntentFilter("from_downloadService"));
}

@Override
protected void onDestroy() {
    unbindService(serviceConnection);
    mLocalBroadcastManager.unregisterReceiver(mBroadcastReceiver);
    EventBus.getDefault().unregister(this);
    super.onDestroy();
}

/**
 *  ： eventbus
 * @param progressEvent
 */
public void onEvent(ProgressEvent progressEvent) {
    mProgressBar.setProgress(progressEvent.getProgress());
}

/**
 *  
 * @param progress
 */
@Override
public void OnProgress(int progress) {
    mProgressBar.setProgress(progress);
}


/**
 *  
 * @param message
 */
@Override
public boolean handleMessage(Message message) {
    mProgressBar.setProgress(message.what);
    return false;
}

@Override
public void onClick(View view) {
    int id = view.getId();
    switch (id) {
        case R.id.button1:
            mDownloadService.startDownload();
            break;
        case R.id.button2:
            break;
        default:
            break;
    }
}

ServiceConnection serviceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        mDownloadService = ((DownloadService.MsgBinder) iBinder).getService();

        /**
         *  
         */
        /*if (mDownloadService != null) {
            mDownloadService.setOnProgressListener(MainActivity.this);
        }*/

        /**
         *  
         * //TODO: 
         */
        /*if (mDownloadService != null) {
            mDownloadService.setHandler(new Handler(MainActivity.this));
        }*/
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {
    }
};

/**
 *  
 */
BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        mProgressBar.setProgress(intent.getIntExtra("KEY_PROGRESS", -1));
    }
};
}

=================================

public class DownloadService extends Service {

public final static int MAX_PROGRESS = 100;

private int mProgress = 0;

private OnProgressListener mOnProgressListener;

private Handler mHandler;

public DownloadService() {
}

@Override
public IBinder onBind(Intent intent) {
    return new MsgBinder();
}

/**
 *  ： 
 * @param onProgressListener
 */
public void setOnProgressListener(OnProgressListener onProgressListener) {
    this.mOnProgressListener = onProgressListener;
}

/**
 *  ： Activity handler 
 * @param handler
 */
public void setHandler(Handler handler) {
    this.mHandler = handler;
}

/**
 * //TODO: 
 */
public void startDownload() {
    new Thread(new Runnable() {
        @Override
        public void run() {
            while (mProgress < MAX_PROGRESS) {
                mProgress += 5;

                /**
                 *  
                 */
                /*if (mOnProgressListener != null) {
                    mOnProgressListener.OnProgress(mProgress);
                }*/

                /**
                 *  
                 */
                /*if (mHandler != null) {
                    Message message = new Message();
                    message.what = mProgress;
                    mHandler.sendMessage(message);
                }*/


                /**
                 *  
                 */
                /*Intent intent = new Intent("from_downloadService");
                intent.putExtra("KEY_PROGRESS", mProgress);
                LocalBroadcastManager.getInstance(DownloadService.this).sendBroadcast(intent);*/

                EventBus.getDefault().post(new ProgressEvent(mProgress));

                try {
                    Thread.sleep(1000);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }).start();
}

public class MsgBinder extends Binder {

    public DownloadService getService() {
        return DownloadService.this;
    }
}
}

===========================

public interface OnProgressListener {
    void OnProgress(int progress);
}

===========================

public class ProgressEvent {
public ProgressEvent(int mProgress) {
    this.mProgress = mProgress;
}

public int getProgress() {
    return mProgress;
}

public void setProgress(int mProgress) {
    this.mProgress = mProgress;
}

private int mProgress = 0;

}

リファレンス

[関連ディスカッション]http://stackoverflow.com/questions/2463175/how-to-have-android-service-communicate-with-activity[関連ディスカッション]http://stackoverflow.com/questions/20594936/communication-between-activity-and-service[LocalBroadcastManager公式リファレンス]http://developer.android.com/reference/android/support/v4/content/LocalBroadcastManager.html[EventBusソースの詳細]https://github.com/android-cn/android-open-project-analysis/tree/master/tool-lib/event-bus/event-bus[EventBusとottoアプリケーションとパフォーマンスの比較]http://timnew.me/blog/2014/09/14/otto-and-android-annotations-compatibility-issue-analysis/[EventBusとottoソースの比較]http://frodoking.github.io/2015/03/30/android-eventbus-otto-analysis/[その他]1.http://developer.samsung.com/technical-doc/view.do;jsessionid=vF09VyrXngrTLTX9f2gfn2zvP2GjTSqs1T91GWF31PNhHvlBc2gv!-1892717541?v=T000000087 2.http://developer.android.com/reference/android/app/Service.html#RemoteMessengerServiceSample 3.http://developer.android.com/guide/components/bound-services.html 4.http://www.jikexueyuan.com/blog/308.html 5.http://blog.philippheckel.com/2012/06/10/android-example-communication-between-activity-and-service-using-messaging/6.http://blog.csdn.net/xiaanming/article/details/9750689 7.https://androidexperinz.wordpress.com/2012/02/21/communication-between-service-and-activity-part-2/