ServiceはBroadcastReceiverを介してActivityと通信する

public class MainActivity extends AppCompatActivity {
    IntentFilter intentFilter;
    private BroadcastReceiver intentRecevicer = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Toast.makeText(getBaseContext(),"onReceive => File download!",Toast.LENGTH_SHORT).show();
        }
    };
    @Override
    protected void onResume() {
        super.onResume();
        intentFilter = new IntentFilter();
        intentFilter.addAction("FILE_DOWNLOAD_ACTION");
        registerReceiver(intentRecevicer,intentFilter);
    }
    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(intentRecevicer);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void startService(View view){
        Log.i("Service","startService");
        startService(new Intent(this,MyIntentService.class));
    }
    public void stopService(View view){
        Log.i("Service","stopService");

    }
}

public class MyIntentService extends IntentService {

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i("Service","MyIntentService Destroy");
    }
    public MyIntentService() {
        super("MyIntentServiceName");
    }
    @Override
    protected void onHandleIntent(Intent intent) {
        try{
            int result = DownloadFile(new URL("http://www.x-motion.com/somefile.pdf"));

            Intent broadcastIntent = new Intent();
            broadcastIntent.setAction("FILE_DOWNLOAD_ACTION");
            getBaseContext().sendBroadcast(broadcastIntent);

        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
    }
    private int DownloadFile(URL url){
        try{
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return 100;
    }
}