Android wifi：處理器味精不起作用

我想問一個關於我的Wifi客戶端通信代碼的問題。我正在與Raspberry Pi通信作爲服務器。我的代碼的架構是：Android wifi：處理器味精不起作用

主要活動：我Handler類和我在那個需要建立WiFi連接的照顧OnCreat的第一個線程（線程1）推出。

public class MainActivity extends AppCompatActivity { 
public int serverPort = 40000; 
public String serverIP = "10.177.86.212"; 
public WiFiConnector wifiConnection; 

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

editTextWE = (EditText) findViewById(R.id.editText_WE); 

wifiConnection = new WiFiConnector(serverIP, serverPort); 

Handler mHandler = new MyHandler(); 

WiFiConnector.Thread1 = new Thread(new WiFiConnector.Thread1(mHandler,true)); 
WiFiConnector.Thread1.start(); 
} 

private class MyHandler extends Handler { 
private byte[] bytes = null; 

@Override 
public void handleMessage(Message msg) { 
     bytes = msg.getData().getByteArray("KEY"); 
     if(bytes!= null){ 
     for (int i = 0; i < bytes.length; i++){ 
      Log.d("Data received", "value " + (0xFF & bytes[i])); 
     } 

     for (int i=0; i<bytes.length; i++) { 
      editTextWE.setText(editTextWE.getText()+ "Server says: " + bytes.length + " "+ (0xFF & bytes[i]) + "\n"); 
     } 
    } 
} 
} 
}

WifiConnector類：線程1和線程共享從主要活動來的處理程序。 Thread1向Raspberry Pi發送命令讓它開始發送數據。線程2專用於讀取從服務器接收的數據。

public class WiFiConnector { 

static String serverIP; 
static int serverPort; 
public static Thread Thread1 = null; 

//Constructor 
public WiFiConnector(String IP, int port) { 
serverIP = IP; 
serverPort = port; 
} 

public static class Thread1 extends Thread implements Runnable { 

private Handler handler1; 
boolean firsttime = false; 
OutputStream out ; 

public Thread1(Handler handler_1, boolean firsttime) { 
this.handler1 = handler_1; 
this.firsttime = firsttime; 
} 

public void run() { 
Socket socket = null; 

try { 

    //Writing to a Socket 
    InetAddress serverAddress = InetAddress.getByName(serverIP); 
    socket = new Socket(serverAddress, serverPort); 

    out = new DataOutputStream(socket.getOutputStream()); 
    if(firsttime){ 
    //I send "B" to Raspberry to let him start sending data 
    out.write("B".getBytes()); 
    this.fisrttime = false; 
    } 

    Thread2 comThread = new Thread2(socket, handler1); 
    new Thread(comThread).start(); 

} catch (UnknownHostException e) { 
    e.printStackTrace(); 
} catch (IOException e) { 
    e.printStackTrace(); 
} 
} 
} 

public static class Thread2 implements Runnable { 

public Socket clientSocket; 
private Handler handler_2; 
public DataInputStream in; 
public byte[] bytes = new byte[13]; 
public Message msg; 

public Thread2(Socket clientSocket, Handler handler2) { 
this.clientSocket = clientSocket; 
this.handler_2 = handler2; 
} 

public void run() { 

while (!Thread.currentThread().isInterrupted()) { 

    try { 

     if (Looper.myLooper() == null) { 
      Looper.prepare(); 
     } 

     this.in = new DataInputStream(clientSocket.getInputStream()); 
     in.readFully(bytes); 

     if (in != null) { 
      for (int i = 0; i < bytes.length; i++){ 
       Log.d("Data received", "valuewifi " + (0xFF & bytes[i])); 
      } 

      msg = new Message(); 
      Bundle b = new Bundle(); 
      b.putByteArray("KEY", bytes); 
      msg.setData(b); 
      handler_2.sendMessage(msg); 
     } else { 
      Thread1 = new Thread(new Thread1(handler_2,false)); 
      Thread1.start(); 
      return; 
     } 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
} 
Looper.loop(); 
} 
} 
}

現在的問題是：正確

Log.d("Data received", "valuewifi " + (0xFF & bytes[i]));

打印我的值：我從樹莓裨接收正確我的數據（包的13個字節每個），確實如此。然後我創建要發送到MainActivity中的處理程序的消息。所述包包括（我已驗證）的輸入流的相同值的接收，但是在MainActivity的處理程序的信息印刷：

Log.d("Data received", "value " + (0xFF & bytes[i]));

替換每個消息的第一字節的值（我試圖獲得2將每個與RPi的通信打包），其中66是實際上是我發送的用於啓動從Raspberry Pi發送數據的「B」的ASCII碼。

請問你有什麼想法爲什麼這是發生？非常感謝您的幫助提前！:)

來源

2017-07-19 Fra

好吧，我發現，在線程2，如果我把

public byte[] bytes = new byte[13];

運行{..}內之前

in.readFully(bytes);

交換的信息完美地發生。否則，我只能從MainActivity獲得從服務器接收到的最後一個字節包。

任何有關它爲什麼會發生的建議？謝謝！

來源

2017-07-21 10:56:12 Fra

Android wifi：處理器味精不起作用

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