（1）针对TCP/IP的Socket、ServerSocket
（2）针对UDP的DatagramSocket、DatagramPackage。这里需要注意的是，考虑到Android设备通常是手持终端,IP都是随着上网进行分配的。不是固定的。因此开发也是有一点与普通互联网应用有所差异的。
（3）针对直接URL的HttpURLConnection。
（4）Google集成了Apache HTTP客户端，可使用HTTP进行网络编程。
（5）使用WebService。Android可以通过开源包如jackson去支持Xmlrpc和Jsonrpc,另外也可以用Ksoap2去实现Webservice。
（6）直接使用WebView视图组件显示网页。基于WebView 进行开发，Google已经提供了一个基于chrome-lite的Web浏览器，直接就可以进行上网浏览网页。
一、socket与serverSocket
客户端代码
public class TestNetworkActivity extends Activity implements OnClickListener{private Button connectBtn;private Button sendBtn;private TextView showView;private EditText msgText;private Socket socket;private Handler handler;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.test_network_main);connectBtn = (Button) findViewById(R.id.test_network_main_btn_connect);sendBtn = (Button) findViewById(R.id.test_network_main_btn_send);showView = (TextView) findViewById(R.id.test_network_main_tv_show);msgText = (EditText) findViewById(R.id.test_network_main_et_msg);connectBtn.setOnClickListener(this);sendBtn.setOnClickListener(this);handler = new Handler(){@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);String data = msg.getData().getString("msg");showView.setText("来自服务器的消息:"+data);}};}@Overridepublic void onClick(View v) {//连接服务器if(v == connectBtn){connectServer();}//发送消息if(v == sendBtn){String msg = msgText.getText().toString();send(msg);}}/** *连接服务器的方法*/public void connectServer(){try {socket = new Socket("192.168.1.100",4000);System.out.println("连接服务器成功");recevie();} catch (Exception e) {System.out.println("连接服务器失败"+e);e.printStackTrace();} }/***发送消息的方法*/public void send(String msg){try {PrintStream ps = new PrintStream(socket.getOutputStream());ps.println(msg);ps.flush();} catch (IOException e) {e.printStackTrace();}}/***读取服务器传回的方法*/public void recevie(){new Thread(){public void run(){while(true){try {InputStream is = socket.getInputStream();BufferedReader br = new BufferedReader(new InputStreamReader(is));String str = br.readLine();Message message = new Message();Bundle bundle = new Bundle();bundle.putString("msg", str);message.setData(bundle);handler.sendMessage(message);} catch (IOException e) {e.printStackTrace();}}}}.start();}
}二、RUL、URLConnection、httpURLConnection、ApacheHttp、WebView
public class TestURLActivity extends Activity implements OnClickListener {private Button connectBtn;private Button urlConnectionBtn;private Button httpUrlConnectionBtn;private Button httpClientBtn;private ImageView showImageView;private TextView showTextView;private WebView webView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.test_url_main);connectBtn = (Button) findViewById(R.id.test_url_main_btn_connect);urlConnectionBtn = (Button) findViewById(R.id.test_url_main_btn_urlconnection);httpUrlConnectionBtn = (Button) findViewById(R.id.test_url_main_btn_httpurlconnection);httpClientBtn = (Button) findViewById(R.id.test_url_main_btn_httpclient);showImageView = (ImageView) findViewById(R.id.test_url_main_iv_show);showTextView = (TextView) findViewById(R.id.test_url_main_tv_show);webView = (WebView) findViewById(R.id.test_url_main_wv);connectBtn.setOnClickListener(this);urlConnectionBtn.setOnClickListener(this);httpUrlConnectionBtn.setOnClickListener(this);httpClientBtn.setOnClickListener(this);}@Overridepublic void onClick(View v) {// 直接使用URL对象进行连接if (v == connectBtn) {try {URL url = new URL("http://192.168.1.100:8080/myweb/image.jpg");InputStream is = url.openStream();Bitmap bitmap = BitmapFactory.decodeStream(is);showImageView.setImageBitmap(bitmap);} catch (Exception e) {e.printStackTrace();}}// 直接使用URLConnection对象进行连接 if (v == urlConnectionBtn) {try {URL url = new URL("http://192.168.1.100:8080/myweb/hello.jsp");URLConnection connection = url.openConnection();InputStream is = connection.getInputStream();byte[] bs = new byte[1024];int len = 0;StringBuffer sb = new StringBuffer();while ((len = is.read(bs)) != -1) {String str = new String(bs, 0, len);sb.append(str);}showTextView.setText(sb.toString());} catch (Exception e) {e.printStackTrace();}}// 直接使用HttpURLConnection对象进行连接if (v == httpUrlConnectionBtn) {try {URL url = new URL("http://192.168.1.100:8080/myweb/hello.jsp?username=abc");HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setRequestMethod("GET");if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {String message = connection.getResponseMessage();showTextView.setText(message);}} catch (Exception e) {e.printStackTrace();}}// 使用ApacheHttp客户端进行连接(重要方法)if (v == httpClientBtn) {try {HttpClient client = new DefaultHttpClient();// 如果是Get提交则创建HttpGet对象，否则创建HttpPost对象// HttpGet httpGet = new// HttpGet("http://192.168.1.100:8080/myweb/hello.jsp?username=abc&pwd=321");// post提交的方式HttpPost httpPost = new HttpPost("http://192.168.1.100:8080/myweb/hello.jsp");// 如果是Post提交可以将参数封装到集合中传递List dataList = new ArrayList();dataList.add(new BasicNameValuePair("username", "aaaaa"));dataList.add(new BasicNameValuePair("pwd", "123"));// UrlEncodedFormEntity用于将集合转换为Entity对象httpPost.setEntity(new UrlEncodedFormEntity(dataList));// 获取相应消息HttpResponse httpResponse = client.execute(httpPost);// 获取消息内容HttpEntity entity = httpResponse.getEntity();// 把消息对象直接转换为字符串String content = EntityUtils.toString(entity);//showTextView.setText(content);//通过webview来解析网页webView.loadDataWithBaseURL(null, content, "text/html", "utf-8", null);//给点url来进行解析//webView.loadUrl(url);} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}}
}三、使用webService
public class LoginActivity extends Activity implements OnClickListener{private Button loginBtn;private static final String SERVICE_URL = "http://192.168.1.100:8080/loginservice/LoginServicePort";private static final String NAMESPACE = "http://service.lovo.com/";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.login_main);loginBtn = (Button) findViewById(R.id.login_main_btn_login);loginBtn.setOnClickListener(this);}@Overridepublic void onClick(View v) {if(v == loginBtn){//创建WebService的连接对象HttpTransportSE httpSE = new HttpTransportSE(SERVICE_URL);//通过SOAP1.1协议对象得到envelopSoapSerializationEnvelope envelop = new SoapSerializationEnvelope(SoapEnvelope.VER11);//根据命名空间和方法名来创建SOAP对象SoapObject soapObject = new SoapObject(NAMESPACE, "validate");//向调用方法传递参数soapObject.addProperty("arg0", "abc");soapObject.addProperty("arg1","123");//将SoapObject对象设置为SoapSerializationEnvelope对象的传出SOAP消息envelop.bodyOut = soapObject;try {//开始调用远程的方法httpSE.call(null, envelop);//得到远程方法返回的SOAP对象SoapObject resultObj = (SoapObject) envelop.bodyIn;//根据名为return的键来获取里面的值，这个值就是方法的返回值String returnStr = resultObj.getProperty("return").toString();Toast.makeText(this, "返回值："+returnStr, Toast.LENGTH_LONG).show();} catch (IOException e) {e.printStackTrace();} catch (XmlPullParserException e) {e.printStackTrace();}}}
}
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