參考http://blog.csdn.net/ryantang03/article/details/8274517

注意

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

		Button button = (Button) this.findViewById(R.id.btn);
		button.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				try {
					System.out.println("Client：Connecting");
					//IP地址和埠號（對應服務端），我這的IP是本地路由器的IP地址
					Socket socket = new Socket("192.168.1.104", 12345);
					//傳送給服務端的訊息
					String message = "Message from Android phone";
					try {
						System.out.println("Client Sending: '" + message + "'");
						
						//第二個引數為True則為自動flush
						PrintWriter out = new PrintWriter(
								new BufferedWriter(new OutputStreamWriter(
										socket.getOutputStream())), true);
						out.println(message);
//						out.flush();
					} catch (Exception e) {
						e.printStackTrace();
					} finally {
						//關閉Socket
						socket.close();
						System.out.println("Client:Socket closed");
					}
				} catch (UnknownHostException e1) {
					e1.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				}

			}
		});
	}
}
 

這個軟體，可以很方便的獲取ip地址。

改過ip地址後，記得在AndroidManifest.xml的user-sdk後，加上 <uses-permission android:name="android.permission.INTERNET" />，這是因為android4.0之後，網路訪問必須請求許可權。