Android Network Programming and android Network Programming instances

Android Network Programming and android Network Programming instances

Step 1: Implement socket communication.
First, I learned socket programming, which is the most basic.
We use the PC to write a Java program as the server, and then write an Android app as the client, and then implement communication.

Create a Java class as follows:

import java.io.IOException;import java.io.OutputStream;import java.net.ServerSocket;import java.net.Socket;public class SimpleServer {    public static void main(String[] args) throws IOException    {        ServerSocket ss = new ServerSocket(30000);        while (true) {            Socket socket = ss.accept();            OutputStream os = socket.getOutputStream();            os.write("my email is ruihanL@126.com".getBytes("utf-8"));            os.close();            socket.close();        }    }}

Click to run the job. In case of abnormal operation, open the task manager, stop javaw.exe, and click run again.

The andriod app code is as follows:

package com.example.simpleclient;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.Socket;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.widget.TextView;public class MainActivity extends ActionBarActivity {    TextView textView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        textView = (TextView)findViewById(R.id.textView1);        new Thread(){            public void run(){                try{                    Socket socket = new Socket("192.168.10.103",30000);                    BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));                    String line =  br.readLine();                    textView.setText(line);                    br.close();                    socket.close();                }                catch(IOException e)                {                    e.printStackTrace();                }            }        }.start();    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, 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);    }}

Change the IP address to the IP address of the PC. The port must be the same. After compilation, install it on your mobile phone. The layout file is only a textview.

Run the app, you can see "my email is ruihanL@126.com.