Udp客户端工作在Java但不是在Android

Question

我已经在NetBeans中测试了程序，它工作正常，但它不工作在Android。它没有收到任何数据并在此行被阻止，但netbeans中的相同代码能够接收数据。执行时不会抛出错误或异常。感谢您的任何建议。

import java.net.InetSocketAddress; 
     import java.nio.ByteBuffer; 
     import java.nio.ByteOrder; 
     import java.nio.channels.DatagramChannel; 

     public class StarterThread implements Runnable { 

      Thread t; 
      DatagramChannel channel; 


      StarterThread() { 
       t = new Thread(this, "Starter Thread"); 
       System.out.println("Starter Thread : " + t); 
       t.start(); 
      } 

      public void run() { 
       try { 
        channel = DatagramChannel.open(); 
        channel.connect(new InetSocketAddress("192.168.43.62", 49191)); 
        String newData = "START\r\n"; 
        ByteBuffer buf = ByteBuffer.allocate(190); 
        buf.order(ByteOrder.LITTLE_ENDIAN); 

        buf.clear(); 
        buf.put(newData.getBytes()); 
        buf.flip(); 
        channel.write(buf); 
        int i = 0; 
        while (true) { 
         Log.i("Info", "In while loop"); 
         buf.clear(); 
         Log.i("log i", "" + i); 
         InetSocketAddress client = (InetSocketAddress) channel.receive(buf); 
         buf.flip(); 
         Log.i("TimeStamp", " " + JIHelper.getUnsignedInt(buf.getInt())); 
         System.out.println(new String(buf.array(), "UTF-8")); 
         i++; 
         Log.i("log i", "" + i); 
         if (i % 10 == 0) { 
          newData = "KEEP-ALIVE\r\n"; 
          Log.i("Message sent", "KEEP-ALIVE SENT"); 
          buf.clear(); 
          buf.put(newData.getBytes()); 
          buf.flip(); 
          channel.write(buf); 
          if (i == 100) 
           i = 0; 
         } 
        } 
       } catch (Exception e) { 
        e.printStackTrace(); 
       } 
      } 

     } 

     public class DisplayActivity extends AppCompatActivity { 
     public void sendStartPacket(View view) { 
     new StarterThread(); 
     } 
} 

Answer 1

如果使用Android> = 5.0，DatagramChannel.receive（）不起作用。你需要使用DatagramChannel.read（）来代替。