1. 注意
  2. 代码

手机上的澳门永利真的假的Android作为客户端(client)对服务器(server)进行request操作,并从服务器中得到response。

手机上的澳门永利真的假的这里主要使用socket来进行数据传输。

注意

  • 若SDK version > 9,则需要加入

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    if (android.os.Build.VERSION.SDK_INT > 9) {
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);
    }

    否则会有Error: SocketException: socket failed: EACCES (Permission denied).

  • socket的相关操作不能放在UI线程中,否则会有Error: android.os.NetworkOnMainThreadException

代码

手机上的澳门永利真的假的在activity_main.xml中加了一个用于用户输入消息的editText,一个发送消息的button,一个显示接收消息的textView。

发送与接收数据可以是string,也可以是object。

若是object的话记得类要implements java.io.Serializable

  • 手机上的澳门永利真的假的MainActivity.java

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    import android.app.Activity;
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Message;
    import android.os.StrictMode;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.EditText;
    import android.widget.TextView;

    import java.io.BufferedReader;
    import java.io.BufferedWriter;
    import java.io.InputStreamReader;
    import java.io.ObjectInputStream;
    import java.io.ObjectOutputStream;
    import java.io.OutputStreamWriter;
    import java.io.PrintWriter;
    import java.lang.ref.WeakReference;
    import java.net.InetAddress;
    import java.net.Socket;
    import java.util.ArrayList;

    public class MainActivity extends Activity {
    public static final String HOST = "10.0.2.2";
    public static final int PORT = 12345;
    public final MyHandler mHandler = new MyHandler(this);
    public EditText mEditText = null;
    public TextView mTextView = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    if (android.os.Build.VERSION.SDK_INT > 9) {
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);
    }
    mEditText = (EditText) findViewById(R.id.editText);
    mTextView = (TextView) findViewById(R.id.textView);
    findViewById(R.id.button).setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
    Message message = mHandler.obtainMessage();
    message.what = 1;
    mHandler.sendMessage(message);
    }
    });
    }

    public static class MyHandler extends Handler {
    private final WeakReference<MainActivity> mActivity;

    public MyHandler(MainActivity activity) {
    mActivity = new WeakReference<>(activity);
    }

    public void sendString(MainActivity activity) {
    Socket socket = null;
    try {
    socket = new Socket(InetAddress.getByName(HOST), PORT);
    // send message
    String request = activity.mEditText.getText().toString() + "\n";
    PrintWriter out = new PrintWriter(new BufferedWriter(
    new OutputStreamWriter(socket.getOutputStream())),
    true);
    out.write(request);
    out.flush();

    // receive message
    BufferedReader in = new BufferedReader(
    new InputStreamReader(socket.getInputStream()));
    String response = in.readLine();
    activity.mTextView.setText(response);

    out.close();
    in.close();
    } catch (Exception e) {
    e.printStackTrace();
    }
    try {
    if (socket != null) {
    socket.close();
    }
    } catch (Exception e) {
    e.printStackTrace();
    }
    }

    public void sendObject(MainActivity activity) {
    Socket socket = null;
    try {
    socket = new Socket(InetAddress.getByName(HOST), PORT);
    // send object
    ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
    ArrayList<Point> points = new ArrayList<>();
    points.add(new Point(-3, 3.14));
    out.writeObject(points);
    out.flush();

    // receive object
    ObjectInputStream in = new ObjectInputStream(socket.getInputStream());
    Object obj = in.readObject();
    points = (ArrayList<Point>) obj;
    activity.mTextView.setText(points.toString());

    out.close();
    in.close();
    } catch (Exception e) {
    e.printStackTrace();
    }
    try {
    if (socket != null) {
    socket.close();
    }
    } catch (Exception e) {
    e.printStackTrace();
    }
    }

    public void handleMessage(Message msg) {
    MainActivity activity = mActivity.get();
    if (activity != null) {
    switch (msg.what) {
    case 0:
    sendString(activity);
    break;
    case 1:
    sendObject(activity);
    break;
    }
    }
    }
    }
    }
  • Point.java

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    public class Point implements java.io.Serializable {
    public double x, y;

    public Point(double x, double y) {
    this.x = x;
    this.y = y;
    }
    }