指定的AWS Lambda返回值不在输出中

Question

场景1 ：lambda函数在执行时输出返回的值：

方案2 ：执行时，lambda函数输出null而不是返回值：

为什么执行lambda时不输出方案2中的返回值？

注意：方案1中的lambda将输出返回值，而不管body属性是对象还是字符串。

Answer 1

场景2的响应为 public class MainActivity extends AppCompatActivity { private Handler mHandler; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mHandler = new Handler(Looper.getMainLooper()) { @Override public void handleMessage(Message inputMessage) { System.out.println("Got msg!"); super.handleMessage(inputMessage); } }; netService = new HamNet(); netService.startNetwork(getApplicationContext(), mHandler); } private HamNet netService; } public class HamNet extends Service { private Handler mainThreadHdlr; public void startNetwork(Context context, Handler hdlr) { Intent serviceIntent = new Intent(context,HamNet.class); context.startForegroundService(serviceIntent); mainThreadHdlr = hdlr; assert mainThreadHdlr != null; } @Override public int onStartCommand(Intent intent, int flags, int startId) { System.out.println("-=-=-=-=- onStartCommand()"); udpListener = new ArduinoUDPListener(); udpListener.start(); return START_STICKY; } private class ArduinoUDPListener extends Thread { public void run() { System.out.println("-=-=-=-=- ArduinoUDPListener.run()"); if (mainThreadHdlr != null) { Message msg = mainThreadHdlr.obtainMessage(); msg.obj = update; mainThreadHdlr.sendMessage(msg); System.out.println("sent msg!"); } else { System.out.println("null?"); } } } private ArduinoUDPListener udpListener; } ，因为exports.handler中缺少null关键字。将其添加回去后，您将获得所需的响应