android socket通讯例子

package com.example.administrator.myapplication; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.*; import java.io.IOException; import java.io.PrintStream; import java.net.Inet4Address; import java.net.InetAddress; import java.net.Socket; import java.net.UnknownHostException; import java.net.NetworkInterface; import java.util.Enumeration; public class MyActivity extends Activity { /* 服务器地址 */ private final String SERVER_HOST_IP = "www.dinkumtech.com"; /* 服务器端口 */ private final int SERVER_HOST_PORT = 9400; private Button btnConnect; private Button btnSend; private Button btnGetIP; private EditText editSend; private Socket socket; private PrintStream output; public void toastText(String message) { Toast.makeText(this, message, Toast.LENGTH_LONG).show(); } public void handleException(Exception e, String prefix) { e.printStackTrace(); toastText(prefix + e.toString()); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_my); initView(); btnConnect.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { initClientSocket(); } } ); btnSend.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View view){ sendMessage(editSend.getText().toString()); } } ); btnGetIP.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View view){ toastText(getIpAddress()); } } ); } public void closeSocket() { try { output.close(); socket.close(); } catch (IOException e) { handleException(e, "close exception: "); } } public static String getIpAddress() { try { for (Enumeration<NetworkInterface> en = NetworkInterface .getNetworkInterfaces(); en.hasMoreElements();) { NetworkInterface intf = en.nextElement(); for (Enumeration<InetAddress> enumIpAddr = intf .getInetAddresses(); enumIpAddr.hasMoreElements();) { InetAddress inetAddress = enumIpAddr.nextElement(); if (!inetAddress.isLoopbackAddress() && inetAddress instanceof Inet4Address) { // if (!inetAddress.isLoopbackAddress() && inetAddress // instanceof Inet6Address) { return inetAddress.getHostAddress().toString(); } } } } catch (Exception e) { e.printStackTrace(); } return null; } private void initClientSocket(){ try { /* 连接服务器 */ socket=new Socket(SERVER_HOST_IP,SERVER_HOST_PORT); /* 获取输出流 */ output=new PrintStream(socket.getOutputStream(),true,"utf-8"); btnConnect.setEnabled(false); editSend.setEnabled(true); btnSend.setEnabled(true); } catch (UnknownHostException e) { handleException(e, "unknown host exception: " + e.toString()); } catch (IOException e) { handleException(e, "io exception: " + e.toString()); } } private void sendMessage(String msg) { output.print(msg); } public void initView() { btnConnect = (Button)findViewById(R.id.btnConnect); btnSend = (Button)findViewById(R.id.btnSend); btnGetIP=(Button)findViewById(R.id.btnIP); editSend = (EditText)findViewById(R.id.sendMsg); btnSend.setEnabled(false); editSend.setEnabled(false); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.my, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }