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package ccc.ClientSocketDemo1; // 這是命名空間
 
// 這裡是引用java的類別庫
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
 
import java.io.BufferedReader; // 引用串流功能 
import java.io.DataInputStream;
import java.io.IOException; // 引用IO例外功能
import java.io.InputStreamReader; // 引用輸入串流讀取功能 
import java.io.PrintWriter;
import java.net.InetAddress; // 引用網路IP位址功能
import java.net.Socket; // 引用Socket網路功能
 
public class ClientSocketDemo1 extends Activity {
 
	ImageButton imgButton;
	TextView TextView01;
 
 
	public static final int BUFFER_SIZE = 1024;
	private Socket socket = null;
	private PrintWriter out = null;
	private BufferedReader in = null;
	protected DataInputStream in2;
	// 程式進入點
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
 
		imgButton = (ImageButton) findViewById(R.id.imageButton);
		imgButton.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
 
				TextView01.setText(receiveDataFromServerLine());
			}
		});
 
		// 文字方塊
		TextView01 = (TextView) findViewById(R.id.TextView01);
 
		// 用來存放伺服器IP位址的變數
		InetAddress serverIp;
 
		// 嘗試連接Server
		try {
			// 設定IP bs2.to 140.112.172.2
			serverIp = InetAddress.getByName("140.112.172.2");
 
			// 設定port
			int serverPort = 23;
 
			// 初始socket連接
			socket = new Socket(serverIp, serverPort);
 
			out = new PrintWriter(socket.getOutputStream());
			in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			in2 = new DataInputStream(this.socket.getInputStream());
			// 關閉連線
			//socket.close();
		} catch (IOException e) {
			// 出錯後顯示錯誤訊息
			TextView01.setText("Connect error.");
		}
	}
	private void disConnectWithServer() {
        if (socket != null) {
            if (socket.isConnected()) {
                try {
                    in.close();
                    out.close();
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
	//http://stackoverflow.com/questions/5893911/android-client-socket-how-to-read-data
	public String receiveDataFromServer() {
		try {
			String message = "";
			int charsRead = 0;
			char[] buffer = new char[BUFFER_SIZE];
 
			if ((charsRead = in.read(buffer)) != -1) {
				message += new String(buffer).substring(0, charsRead);
			}
 
			//disConnectWithServer(); // disconnect server
			return message;
		} catch (IOException e) {
			return "Error receiving response:  " + e.getMessage();
		}
	}
 
	public String receiveDataFromServerLine() {
		try {
 
			return in.readLine();
		} catch (IOException e) {
			return "Error receiving response:  " + e.getMessage();
		}
	}
	public String receiveDataFromServerLine2() {
		try {
 
			return in2.readUTF();
		} catch (IOException e) {
			return "Error receiving response:  " + e.getMessage();
		}
	}
}

Main.java:19: error: class ClientSocketDemo1 is public, should be declared in a file named ClientSocketDemo1.java
public class ClientSocketDemo1 extends Activity {
       ^
Main.java:4: error: package android.app does not exist
import android.app.Activity;
                  ^
Main.java:5: error: package android.os does not exist
import android.os.Bundle;
                 ^
Main.java:6: error: package android.view does not exist
import android.view.View;
                   ^
Main.java:7: error: package android.widget does not exist
import android.widget.ImageButton;
                     ^
Main.java:8: error: package android.widget does not exist
import android.widget.TextView;
                     ^
Main.java:9: error: package android.widget does not exist
import android.widget.Toast;
                     ^
Main.java:19: error: cannot find symbol
public class ClientSocketDemo1 extends Activity {
                                       ^
  symbol: class Activity
Main.java:21: error: cannot find symbol
	ImageButton imgButton;
	^
  symbol:   class ImageButton
  location: class ClientSocketDemo1
Main.java:22: error: cannot find symbol
	TextView TextView01;
	^
  symbol:   class TextView
  location: class ClientSocketDemo1
Main.java:31: error: cannot find symbol
	public void onCreate(Bundle savedInstanceState) {
	                     ^
  symbol:   class Bundle
  location: class ClientSocketDemo1
Main.java:32: error: cannot find symbol
		super.onCreate(savedInstanceState);
		^
  symbol:   variable super
  location: class ClientSocketDemo1
Main.java:33: error: package R does not exist
		setContentView(R.layout.main);
		                ^
Main.java:35: error: cannot find symbol
		imgButton = (ImageButton) findViewById(R.id.imageButton);
		             ^
  symbol:   class ImageButton
  location: class ClientSocketDemo1
Main.java:35: error: package R does not exist
		imgButton = (ImageButton) findViewById(R.id.imageButton);
		                                        ^
Main.java:36: error: package View does not exist
		imgButton.setOnClickListener(new View.OnClickListener() {
		                                     ^
Main.java:44: error: cannot find symbol
		TextView01 = (TextView) findViewById(R.id.TextView01);
		              ^
  symbol:   class TextView
  location: class ClientSocketDemo1
Main.java:44: error: package R does not exist
		TextView01 = (TextView) findViewById(R.id.TextView01);
		                                      ^
18 errors

Standard output is empty