Question

实际上我想将数据从硬件发送到Android设备。硬件设备连接到连接到调制解调器的本地无线路由器。 Android设备也将通过WI-FI连接到同一路由器。你能否建议一些链接或教程从哪里我可以了解如何建立硬件设备之间的通信，Android设备通过WI-FI发送和接收数据。请帮助任何示例代码或链接

Answer 1

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class SimpleClientActivity extends Activity {

 private Socket client;
 private FileInputStream fileInputStream;
 private BufferedInputStream bufferedInputStream;
 private OutputStream outputStream;
 private Button button;
 private TextView text;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  button = (Button) findViewById(R.id.button1);   //reference to the send button
  text = (TextView) findViewById(R.id.textView1);   //reference to the text view

  //Button press event listener
  button.setOnClickListener(new View.OnClickListener() {

   public void onClick(View v) {


    File file = new File("/mnt/sdcard/input.jpg"); //create file instance, file to transfer or any data

    try {

     client = new Socket("10.0.2.2", 4444);// ip address and port number of ur hardware device

     byte[] mybytearray = new byte[(int) file.length()]; //create a byte array to file

     fileInputStream = new FileInputStream(file);
     bufferedInputStream = new BufferedInputStream(fileInputStream);  

     bufferedInputStream.read(mybytearray, 0, mybytearray.length); //read the file

     outputStream = client.getOutputStream();

     outputStream.write(mybytearray, 0, mybytearray.length); //write file to the output stream byte by byte
     outputStream.flush();
     bufferedInputStream.close();
     outputStream.close();
           client.close();

           text.setText("File Sent");


    } catch (UnknownHostException e) {
     e.printStackTrace();
    } catch (IOException e) {
     e.printStackTrace();
    }


   }
  });

 }
}

//发送消息你也可以使用下面的代码

     public static String ipAddress;// ur ip
    public static int portNumber;// portnumber

    private Socket client;

    private OutputStreamWriter printwriter;
    private String message;


new Thread(new Runnable() {

                    @Override
                    public void run() {
                        // TODO Auto-generated method stub
                        try {
                            client = new Socket(ipAddress, portNumber);
                            printwriter = new OutputStreamWriter(client
                                    .getOutputStream(), "ISO-8859-1");
                            printwriter.write("any message");
                            printwriter.flush();
                            printwriter.close();
                            client.close();
                        }

                        catch (UnknownHostException e) {
                            e.printStackTrace();
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                }).start();

android通过wifi连接接收和发送数据到硬件

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