Senden und empfangen von Daten über UDP-Socket-java android

Hier, in diesem Beitrag finden Sie die detaillierten Codes für die Einrichtung Buchse zwischen Geräten oder zwischen zwei Anwendung in der gleichen mobile.

Erstellen Sie zwei Anwendung zum testen folgenden code.

In beiden Anwendung manifest-Datei, fügen Sie unten die Berechtigung

<uses-permission android:name="android.permission.INTERNET" />

1. App-code: UDP-Client Socket -

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TableRow
        android:id="@+id/tr_send_message"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="11dp">

        <EditText
            android:id="@+id/edt_send_message"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginRight="10dp"
            android:layout_marginLeft="10dp"
            android:hint="Enter message"
            android:inputType="text" />

        <Button
            android:id="@+id/btn_send"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="10dp"
            android:text="Send" />
    </TableRow>

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/tr_send_message"
        android:layout_marginTop="25dp"
        android:id="@+id/scrollView2">

        <TextView
            android:id="@+id/tv_reply_from_server"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" />
    </ScrollView>

</RelativeLayout>

UDPClientSocketActivity.java

import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

/**
 * Created by Girish Bhalerao on 5/4/2017.
 */

public class UDPClientSocketActivity extends AppCompatActivity implements View.OnClickListener {

    private TextView mTextViewReplyFromServer;
    private EditText mEditTextSendMessage;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button buttonSend = (Button) findViewById(R.id.btn_send);

        mEditTextSendMessage = (EditText) findViewById(R.id.edt_send_message);
        mTextViewReplyFromServer = (TextView) findViewById(R.id.tv_reply_from_server);

        buttonSend.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {

            case R.id.btn_send:
                sendMessage(mEditTextSendMessage.getText().toString());
                break;
        }
    }

    private void sendMessage(final String message) {

        final Handler handler = new Handler();
        Thread thread = new Thread(new Runnable() {

            String stringData;

            @Override
            public void run() {

                    DatagramSocket ds = null;
                    try {
                        ds = new DatagramSocket();
                        //IP Address below is the IP address of that Device where server socket is opened.
                        InetAddress serverAddr = InetAddress.getByName("xxx.xxx.xxx.xxx");
                        DatagramPacket dp;
                        dp = new DatagramPacket(message.getBytes(), message.length(), serverAddr, 9001);
                        ds.send(dp);

                        byte[] lMsg = new byte[1000];
                        dp = new DatagramPacket(lMsg, lMsg.length);
                        ds.receive(dp);
                        stringData = new String(lMsg, 0, dp.getLength());

                    } catch (IOException e) {
                        e.printStackTrace();
                    } finally {
                        if (ds != null) {
                            ds.close();
                        }
                    }

                handler.post(new Runnable() {
                    @Override
                    public void run() {

                        String s = mTextViewReplyFromServer.getText().toString();
                        if (stringData.trim().length() != 0)
                            mTextViewReplyFromServer.setText(s + "\nFrom Server : " + stringData);

                    }
                });
            }
        });

        thread.start();
    }
}

2. App-Code - UDP-Server-Sockets

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/btn_stop_receiving"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="STOP Receiving data"
        android:layout_alignParentTop="true"
        android:enabled="false"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="89dp" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/btn_stop_receiving"
        android:layout_marginTop="35dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true">

        <TextView
            android:id="@+id/tv_data_from_client"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" />
    </ScrollView>

    <Button
        android:id="@+id/btn_start_receiving"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="START Receiving data"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="14dp" />
</RelativeLayout>

UDPServerSocketActivity.java

import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;

/**
 * Created by Girish Bhalerao on 5/4/2017.
 */

public class UDPServerSocketActivity extends AppCompatActivity implements View.OnClickListener {

    final Handler handler = new Handler();

    private Button buttonStartReceiving;
    private Button buttonStopReceiving;
    private TextView textViewDataFromClient;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        buttonStartReceiving = (Button) findViewById(R.id.btn_start_receiving);
        buttonStopReceiving = (Button) findViewById(R.id.btn_stop_receiving);
        textViewDataFromClient = (TextView) findViewById(R.id.tv_data_from_client);

        buttonStartReceiving.setOnClickListener(this);
        buttonStopReceiving.setOnClickListener(this);

    }

    private void startServerSocket() {

        Thread thread = new Thread(new Runnable() {

            private String stringData = null;

            @Override
            public void run() {

                byte[] msg = new byte[1000];
                DatagramPacket dp = new DatagramPacket(msg, msg.length);
                DatagramSocket ds = null;
                try {
                    ds = new DatagramSocket(9001);
                    //ds.setSoTimeout(50000);
                    ds.receive(dp);

                    stringData = new String(msg, 0, dp.getLength());
                    updateUI(stringData);

                    String msgToSender = "Bye Bye ";
                    dp = new DatagramPacket(msgToSender.getBytes(), msgToSender.length(), dp.getAddress(), dp.getPort());
                    ds.send(dp);

                } catch (IOException e) {
                    e.printStackTrace();
                } finally {
                    if (ds != null) {
                        ds.close();
                    }
                }
            }

        });
        thread.start();
    }

    private void updateUI(final String stringData) {

        handler.post(new Runnable() {
            @Override
            public void run() {

                String s = textViewDataFromClient.getText().toString();
                if (stringData.trim().length() != 0)
                    textViewDataFromClient.setText(s + "\n" + "From Client : " + stringData);
            }
        });
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {

            case R.id.btn_start_receiving:

                startServerSocket();

                buttonStartReceiving.setEnabled(false);
                buttonStopReceiving.setEnabled(true);
                break;

            case R.id.btn_stop_receiving:

                //Add logic to stop server socket yourself

                buttonStartReceiving.setEnabled(true);
                buttonStopReceiving.setEnabled(false);
                break;
        }
    }
}

InformationsquelleAutor Girish Bhalerao