Handlerに関する問題。 catchされない例外で終了するスレッド。

Question

私を躊躇せず、私の最初のプログラムです。あるスレッドから別のスレッドにメッセージを送信しようとしますが、受信に失敗します。クラッシュのログがあります。

...

public class MainActivity extends Activity implements SeekBar.OnSeekBarChangeListener, SensorEventListener, NsdHelper.DiscoverListener { 
    private static final String TAG = "MainActivity"; 
    private SeekBar channel4PositionBar, channel5PositionBar, channel6PositionBar; 
    private MaestroSSC maestroSSC; 

    NsdHelper mNsdHelper; 
    PositionConnection mConnection; 
    private Handler mUpdateHandler; 

：

04-15 18:29:43.610 14765-15803/annikov.dd E/PositionConnection: Updating message: 50385 
04-15 18:29:43.630 14765-15803/annikov.dd E/PositionConnection: mUpdateHandler { when=-9m0s379ms barrier=0 } 
04-15 18:29:43.630 14765-15803/annikov.dd E/PositionConnection: mUpdateHandler.getdata Bundle[{pos=50385}] 
04-15 18:29:43.640 14765-15803/annikov.dd W/dalvikvm: threadid=15: thread exiting with uncaught exception (group=0x4153abc0) 
04-15 18:29:43.660 14765-15803/annikov.dd E/AndroidRuntime: FATAL EXCEPTION: Thread-194 
                  Process: annikov.dd, PID: 14765 
                  java.lang.NullPointerException 
                   at annikov.dd.PositionConnection.updateMessages(PositionConnection.java:92) 
                   at annikov.dd.PositionConnection$PositionClient$ReceivingThread.run(PositionConnection.java:242) 
                   at java.lang.Thread.run(Thread.java:864) 
04-15 18:29:43.970 14765-14808/annikov.dd I/NsdHelper: Discovery stopped: _http._tcp. 
04-15 18:29:45.450 14765-14765/annikov.dd D/PositionClient: Socket getted 
04-15 18:29:45.470 14765-14807/annikov.dd E/PositionConnection: Error creating ServerSocket: 
                   java.net.SocketException: Socket closed 
                    at libcore.io.Posix.accept(Native Method) 
                    at libcore.io.BlockGuardOs.accept(BlockGuardOs.java:55) 
                    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:98) 
                    at java.net.ServerSocket.implAccept(ServerSocket.java:203) 
                    at java.net.ServerSocket.accept(ServerSocket.java:128) 
                    at annikov.dd.PositionConnection$PositionServer$ServerThread.run(PositionConnection.java:152) 
                    at java.lang.Thread.run(Thread.java:864) 
04-15 18:29:45.470 14765-14807/annikov.dd W/System.err: java.net.SocketException: Socket closed 
04-15 18:29:45.470 14765-14807/annikov.dd W/System.err:  at libcore.io.Posix.accept(Native Method) 
04-15 18:29:45.470 14765-14807/annikov.dd W/System.err:  at libcore.io.BlockGuardOs.accept(BlockGuardOs.java:55) 
04-15 18:29:45.480 14765-14807/annikov.dd W/System.err:  at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:98) 
04-15 18:29:45.480 14765-14807/annikov.dd W/System.err:  at java.net.ServerSocket.implAccept(ServerSocket.java:203) 
04-15 18:29:45.480 14765-14807/annikov.dd W/System.err:  at java.net.ServerSocket.accept(ServerSocket.java:128) 
04-15 18:29:45.490 14765-14807/annikov.dd W/System.err:  at annikov.dd.PositionConnection$PositionServer$ServerThread.run(PositionConnection.java:152) 
04-15 18:29:45.490 14765-14807/annikov.dd W/System.err:  at java.lang.Thread.run(Thread.java:864) 
04-15 18:34:44.160 14765-15803/annikov.dd I/Process: Sending signal. PID: 14765 SIG: 9 

これは、コードの送信者の一部です：

public class PositionConnection { 

    private Handler mUpdateHandler; 

...

public synchronized void updateMessages(int position, boolean local) { 
    Log.e(TAG, "Updating message: " + position); 


    Bundle messageBundle = new Bundle(); 
    messageBundle.putInt("pos", position); 

    Message message = new Message(); 
    message.setData(messageBundle); 
    Log.e(TAG, "mUpdateHandler " + message); 
    Log.e(TAG, "mUpdateHandler " + message.getData()); 
    mUpdateHandler.sendMessage(message);    <---here it is crashed 
    //mUpdateHandler.sendEmptyMessage(30450); 


} 

そして、これは受信機からです

mUpdateHandler = new Handler() 

{ 
    @Override 
    public void handleMessage(Message msg) { 
     int position = msg.getData().getInt("pos"); 

     if (position >= 50000) { 
      maestroSSC.setTarget(5, position - 50000); 
      servo2value.setText(String.valueOf(position - 50000)); 
      channel6PositionBar.setProgress(position - 50000); 
     } else if (position >= 40000) { 
      maestroSSC.setTarget(4, position - 40000); 
      servo1value.setText(String.valueOf(position - 40000)); 
      channel5PositionBar.setProgress(position - 40000); 
     } else if (position >= 30000) { 
      pwmvalue.setText(String.valueOf(position - 30000)); 
      maestroSSC.setTarget(3, position - 30000 + 1200); 
      channel4PositionBar.setProgress(position - 30000); 
     } 
     //setSeekBarProgressIgnoreListener(position); 
    } 
}; 

ここで何が間違っているのか分かりますか？私は本当に、さらには、*（

Answer 1

がannikov.dd.PositionConnection.updateMessages(PositionConnection.java:92)でNullPointerExceptionあり続行するのか分からない。mUpdateHandlerヌルであることは、あなたがPositionConnection` `で` mUpdateHandler`を初期化しているPositionConnection