java - SocketChannel 还没有准备好

Question

我再次遇到 Android 套接字编程方面的问题。我的问题是 Selector.select() 返回零，表示没有准备好写入的 SocketChannels。同样的代码同样适用于普通的 Java，但不适用于 Android。这是我的代码:

package com.test;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class WebSocketTest extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

  SocketChannel channel = null;

        SocketAddress socketAdress = new InetSocketAddress("10.0.0.1", 8787);

  try {
   channel = SocketChannel.open();
  } catch (IOException e) {
   Log.e("ERROR", "channel open");
  }

  try {
   channel.configureBlocking(false);
  } catch (IOException e1) {
   Log.e("ERROR", "channel blocking");
  }

  try {
   channel.connect(socketAdress);
  } catch (IOException e) {
   Log.e("ERROR", "channel connect");
  }

  try {
   while(!channel.finishConnect())
   {

   }
  } catch (IOException e1) {
   Log.e("ERROR", "channel finishConnect");
  }


  Selector selector = null;
  try {
   selector = Selector.open();
  } catch (IOException e) {
   Log.e("ERROR", "selector open");
  }
  try {
   channel.register(selector, channel.validOps());
  } catch (ClosedChannelException e) {
   Log.e("ERROR", "channel register");
  }

  boolean i = true;

  while(i)
  {
   int readyChannels = 0;
   try {
    readyChannels = selector.select();
   } catch (IOException e) {
    Log.e("ERROR", "selector select");
   }

   if(readyChannels > 0)
   {
    i = false;
   }
  }
    }
}

在 Java 中 readyChannels = 1。在 Android 中它是 0。谁能帮帮我？

Answer 1

模拟器位于虚拟路由器后面。你需要配置 Network Redirections (端口转发)使模拟器上的某个端口对外部网络(包括您的计算机)可见。