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Kommunikation Version 1 UDP Socket

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This commit is contained in:
Miguel Siebenhaar 2023-06-08 17:40:21 +02:00
parent 35583a4cdd
commit 3c1366bd10
6 changed files with 221 additions and 21 deletions
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4
app/build.gradle
View File

@ -26,6 +26,9 @@ android {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
buildFeatures {
viewBinding true
}
}
dependencies {
@ -33,6 +36,7 @@ dependencies {
implementation 'androidx.appcompat:appcompat:1.6.1'
implementation 'com.google.android.material:material:1.8.0'
implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
implementation 'com.google.android.gms:play-services-nearby:18.0.0'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.5'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'

8
app/src/main/AndroidManifest.xml
View File

@ -2,18 +2,24 @@
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.Ueberwachungssystem"
tools:targetApi="31">
<activity
android:name=".MainActivity"
android:exported="true">
android:exported="true"
android:label="Server">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

67
app/src/main/java/com/example/ueberwachungssystem/MainActivity.java
View File

@ -1,15 +1,74 @@
package com.example.ueberwachungssystem;
import androidx.appcompat.app.AppCompatActivity;
import android.annotation.SuppressLint;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
@SuppressLint("SetTextI18n")
public class MainActivity extends AppCompatActivity {
TextView tvMessages;
TextView tvConnectionInfos;
WifiCommunication communication;
public static String SERVER_IP = "";
public static final int SERVER_PORT = 2222;
int i=0;
boolean sending = false;
String message;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//
tvMessages = findViewById(R.id.tvMessages);
tvConnectionInfos = findViewById(R.id.tvConnectionInfos);
try {
SERVER_IP = getLocalIpAddress();
tvConnectionInfos.setText("Connection Infos: \n Own IP-Adress: " + SERVER_IP+ " Port: " + SERVER_PORT);
} catch (UnknownHostException e) {
e.printStackTrace();
}
Button btnSend = findViewById(R.id.btnSend);
btnSend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
i++;
communication.sendTrue("Test" +i);
}
});
}
protected void onResume() {
super.onResume();
communication = new WifiCommunication(MainActivity.this, SERVER_PORT);
}
@Override
protected void onPause() {
super.onPause();
communication.stopCommunication();
}
private String getLocalIpAddress() throws UnknownHostException {
WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
assert wifiManager != null;
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int ipInt = wifiInfo.getIpAddress();
return InetAddress.getByAddress(ByteBuffer.allocate(4).order(ByteOrder.LITTLE_ENDIAN).putInt(ipInt).array()).getHostAddress();
}
}

119
app/src/main/java/com/example/ueberwachungssystem/WifiCommunication.java Normal file
View File

@ -0,0 +1,119 @@
package com.example.ueberwachungssystem;
import android.annotation.SuppressLint;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;
public class WifiCommunication {
private final MainActivity mainActivity;
private final InetAddress address;
private final int port;
private String messageToSend;
volatile private boolean send;
private final DatagramSocket socket;
volatile private boolean running;
@SuppressLint("SetTextI18n")
public WifiCommunication(MainActivity mainActivity, int port) {
this.mainActivity = mainActivity;
this.port = port;
try {
socket = new DatagramSocket(this.port);
socket.setBroadcast(true);
address = InetAddress.getByName("255.255.255.255");
running = true;
send = false;
new ReceiveThread().start();
new SendThread().start();
} catch (SocketException | UnknownHostException e) {
throw new RuntimeException(e);
}
mainActivity.runOnUiThread(() -> mainActivity.tvMessages.setText("Communication running"));
}
private class ReceiveThread extends Thread {
private StringBuffer rxStringBuffer = new StringBuffer();
private String rxString;
private String previousRxString = "";
@Override
public void run() {
try {
do {
byte[] rxBuffer = new byte[512];
InetAddress fromAdress;
int fromPort;
DatagramPacket rxPacket = new DatagramPacket(rxBuffer, rxBuffer.length);
socket.receive(rxPacket);
fromAdress = rxPacket.getAddress();
fromPort = rxPacket.getPort();
rxString = new String(rxBuffer, 0, rxPacket.getLength());
if(!previousRxString.equals(rxString)) {
mainActivity.runOnUiThread(() -> mainActivity.tvMessages.setText(rxStringBuffer));
rxStringBuffer.append("Adress: " + fromAdress).append(" Port: " + fromPort).append(" Message " +rxString).append("\n");
}
previousRxString = rxString;
} while (running);
}
catch (IOException e) {
e.printStackTrace();
}
}
}
private class SendThread extends Thread {
private int tmpCnt = 0;
@Override
public void run() {
try {
do {
if(send)
{
send = false;
String txString = getLocalIpAddress() + " sends:" +messageToSend+ " Count: " + tmpCnt++;
byte[] txBuffer = txString.getBytes();
DatagramPacket txPacket = new DatagramPacket(txBuffer, txBuffer.length, address, port);
for(int i = 0; i < 20; i++) {
socket.send(txPacket);
}
}
} while (running);
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static String getLocalIpAddress() {
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface networkInterface = (NetworkInterface) ((Enumeration<?>) en).nextElement();
for (Enumeration<InetAddress> addresses = networkInterface.getInetAddresses(); addresses.hasMoreElements();) {
InetAddress inetAddress = addresses.nextElement();
if (!inetAddress.isLoopbackAddress() && inetAddress instanceof Inet4Address) {
return inetAddress.getHostAddress();
}
}
}
} catch (SocketException ex) {
ex.printStackTrace();
}
return null;
}
public void sendTrue(String message){
send = true;
messageToSend = message;
}
public void stopCommunication() {
running = false;
socket.close();
}
}

31
app/src/main/res/layout/activity_main.xml
View File

@ -1,18 +1,29 @@
<?xml version = "1.0" encoding = "utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
<RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"
xmlns:tools = "http://schemas.android.com/tools"
android:layout_width = "match_parent"
android:layout_height = "match_parent"
android:layout_margin = "16dp"
tools:context = ".MainActivity">
<TextView
android:id = "@+id/tvConnectionInfos"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:inputType = "textMultiLine"
android:textAppearance = "@style/Base.TextAppearance.AppCompat.Medium" />
<TextView
android:id = "@+id/tvMessages"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:layout_below="@id/tvConnectionInfos"
android:inputType = "textMultiLine"
android:textAppearance = "@style/Base.TextAppearance.AppCompat.Medium" />
<Button
android:id="@+id/btnSend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
android:layout_below="@id/tvMessages"
android:layout_centerHorizontal="true"
android:text="SEND" />
</RelativeLayout>

1
settings.gradle
View File

@ -14,3 +14,4 @@ dependencyResolutionManagement {
}
rootProject.name = "Ueberwachungssystem"
include ':app'
include ':app'