Finish DSBmobile

2024-04-25 19:28:37 +02:00
parent d3a9bf72c9
commit c16cc2d364
13 changed files with 478 additions and 64 deletions
--- a/.idea/deploymentTargetDropDown.xml
+++ b/.idea/deploymentTargetDropDown.xml
@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="deploymentTargetDropDown">
-    <value>
-      <entry key="app">
-        <State />
-      </entry>
-    </value>
-  </component>
-</project>
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -61,11 +61,13 @@ dependencies {
    implementation("androidx.datastore:datastore-preferences:1.0.0")
    implementation("com.google.code.gson:gson:2.9.0")
    implementation(platform("androidx.compose:compose-bom:2023.03.00"))
+    implementation(platform("androidx.compose:compose-bom:2023.03.00"))
    testImplementation("junit:junit:4.13.2")
    androidTestImplementation("androidx.test.ext:junit:1.1.5")
    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
    androidTestImplementation("androidx.compose.ui:ui-test-junit4")
    androidTestImplementation(platform("androidx.compose:compose-bom:2023.03.00"))
+    androidTestImplementation(platform("androidx.compose:compose-bom:2023.03.00"))
    debugImplementation("androidx.compose.ui:ui-tooling")
    debugImplementation("androidx.compose.ui:ui-test-manifest")
 }
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -15,6 +15,11 @@
        android:supportsRtl="true"
        android:theme="@style/Theme.CleverClass"
        tools:targetApi="31">
+        <activity
+            android:name=".DSBLoginActivity"
+            android:exported="false"
+            android:label="@string/title_activity_dsblogin"
+            android:theme="@style/Theme.CleverClass" />
        <activity
            android:name=".DSBDayViewActivity"
            android:exported="false"
--- a/app/src/main/java/com/schoolapp/cleverclass/DSBActivity.kt
+++ b/app/src/main/java/com/schoolapp/cleverclass/DSBActivity.kt
@@ -2,6 +2,7 @@ package com.schoolapp.cleverclass

 import android.content.Context
 import android.content.Intent
+import android.content.SharedPreferences
 import android.graphics.BitmapFactory
 import android.os.Bundle
 import androidx.activity.ComponentActivity
@@ -20,7 +21,6 @@ import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowBack
 import androidx.compose.material.icons.filled.Refresh
-import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.Divider
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
@@ -31,6 +31,7 @@ import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
 import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -54,12 +55,23 @@ class DSBActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

+        val sharedPreferences = this.getSharedPreferences("DSBmobile", Context.MODE_PRIVATE)
+        val username = sharedPreferences.getString("username", "").toString()
+        val password = sharedPreferences.getString("password", "").toString()
+
        setContent {
            CleverClassTheme {
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colorScheme.background
                ) {
+                    if(username.isEmpty() || password.isEmpty()) {
+                        val intent = Intent(this@DSBActivity, DSBLoginActivity::class.java).apply {
+                            putExtra(DSBLoginActivity.TYPE_KEY, "FirstTime")
+                        }
+                        startActivity(intent)
+                    }
+
                    DSBContent(activity = this)
                }
            }
@@ -71,13 +83,20 @@ class DSBActivity : ComponentActivity() {
@OptIn(ExperimentalMaterial3Api::class, DelicateCoroutinesApi::class)
@Composable
 fun DSBContent(activity: ComponentActivity){
+    val mainFolder = File(activity.filesDir, "dataDSB")
+    val sharedPreferences = activity.getSharedPreferences("DSBmobile", Context.MODE_PRIVATE)
+
    var loadingState by remember {
-        mutableStateOf(1)
+        mutableStateOf(-2)
+    }
+    var folders by remember {
+        mutableStateOf(mainFolder.listFiles())
    }

    LaunchedEffect(Unit) {
        GlobalScope.launch(Dispatchers.IO) {
            loadingState = downloadDSB(activity)
+            folders = mainFolder.listFiles()
        }
    }

@@ -100,12 +119,13 @@ fun DSBContent(activity: ComponentActivity){
                }
            },
            actions = {
-                if(loadingState != 1) {
+                if(loadingState != -2) {
                    IconButton(
                        onClick = {
-                            loadingState = 1
+                            loadingState = -2
                            GlobalScope.launch(Dispatchers.IO) {
                                loadingState = downloadDSB(activity)
+                                folders = mainFolder.listFiles()
                            }
                        }
                    ) {
@@ -122,13 +142,16 @@ fun DSBContent(activity: ComponentActivity){
        )

        when (loadingState) {
-            1 -> {
-                DSBLoading()
+            -2 -> {
+                LoadingScreen()
            }
-            -1 -> {
-                DSBNoInternet()
+            NO_INTERNET_CONNECTION_CODE -> {
+                DSBError("Keine Internetverbindung")
            }
-            else -> {
+            1 ->{
+                DSBError("Login fehlgeschlagen")
+            }
+            0 -> {
                Column(
                    horizontalAlignment = Alignment.CenterHorizontally,
                    modifier = Modifier
@@ -137,9 +160,7 @@ fun DSBContent(activity: ComponentActivity){
                ) {
                    Spacer(modifier = Modifier.height(32.dp))

-                    val mainFolder = File(activity.filesDir, "dataDSB")
-
-                    mainFolder.listFiles()?.forEach { folder ->
+                    folders.forEach { folder ->
                        DayPrefab(folder, activity)
                        Spacer(modifier = Modifier.height(32.dp))
                        Divider()
@@ -147,28 +168,43 @@ fun DSBContent(activity: ComponentActivity){
                    }
                }
            }
+            else -> {
+                DSBError("Leider ist ein Problem aufgetreten\nFehlercode: $loadingState")
+            }
+        }
+    }
+
+    // changes state when Shared Preference is updated
+    val observer = remember {
+        SharedPreferences.OnSharedPreferenceChangeListener { _, key ->
+            if (key == "password" || key == "username") {
+                loadingState = -2
+
+                GlobalScope.launch(Dispatchers.IO) {
+                    loadingState = downloadDSB(activity)
+                    folders = mainFolder.listFiles()
+                }
+            }
+        }
+    }
+
+    // handles observer disposal
+    DisposableEffect(Unit) {
+        sharedPreferences.registerOnSharedPreferenceChangeListener(observer)
+        onDispose {
+            sharedPreferences.unregisterOnSharedPreferenceChangeListener(observer)
        }
    }
 }

@Composable
-fun DSBLoading(){
-    Box(
-        modifier = Modifier.fillMaxSize(),
-        contentAlignment = Alignment.Center
-    ){
-        CircularProgressIndicator()
-    }
-}
-
-@Composable
-fun DSBNoInternet(){
+fun DSBError(message: String){
    Box(
        modifier = Modifier.fillMaxSize(),
        contentAlignment = Alignment.Center
    ){
        Text(
-            text = "Keine Internetverbindung",
+            text = message,
            style = MaterialTheme.typography.bodySmall,
            color = MaterialTheme.colorScheme.onBackground
        )
--- a/app/src/main/java/com/schoolapp/cleverclass/DSBDayViewActivity.kt
+++ b/app/src/main/java/com/schoolapp/cleverclass/DSBDayViewActivity.kt
@@ -69,7 +69,7 @@ fun DSBDayViewContent(activity: ComponentActivity){
            colors = TopAppBarDefaults.centerAlignedTopAppBarColors(MaterialTheme.colorScheme.primaryContainer),
            title = {
                Text(
-                    text = information.get("PlanInfo").toString(),
+                    text = information.get("PlanInfo").toString().removeSuffix(".pdf"),
                    style = MaterialTheme.typography.headlineSmall,
                    color = MaterialTheme.colorScheme.onPrimaryContainer
                )},
--- a/app/src/main/java/com/schoolapp/cleverclass/DSBDownloader.kt
+++ b/app/src/main/java/com/schoolapp/cleverclass/DSBDownloader.kt
@@ -14,26 +14,31 @@ import java.util.zip.GZIPInputStream
 import java.util.zip.GZIPOutputStream
 import java.io.ByteArrayInputStream
 import java.io.FileOutputStream
+import java.net.SocketException
 import java.time.LocalDateTime
 import java.util.UUID


 suspend fun downloadDSB(context: Context): Int{
+    val sharedPreferences = context.getSharedPreferences("DSBmobile", Context.MODE_PRIVATE)
+    val username = sharedPreferences.getString("username", "").toString()
+    val password = sharedPreferences.getString("password", "").toString()
+
    if(!isInternetAvailable(context))
-        return -1
+        return NO_INTERNET_CONNECTION_CODE

    val mainDir = createDataFolder(context)

-    val jsonResponse = downloadDataTask()
+    val jsonResponse = JSONObject(downloadDataTask(username = username, password = password))
+    if(jsonResponse.get("Resultcode") != 0)
+        return jsonResponse.getInt("Resultcode")

-    downloadImagesTask(jsonResponse, mainDir)
-
-    return 0
+    return downloadImagesTask(jsonResponse, mainDir)
 }

-private fun downloadDataTask() : String {
+private fun downloadDataTask(username: String, password: String) : String {
    return try {
-        val requestBody = createRequestBody()
+        val requestBody = createRequestBody(username = username, password = password)
        val jsonRequest = createJsonRequest(requestBody)

        val responseData = fetchData(jsonRequest)
@@ -45,9 +50,7 @@ private fun downloadDataTask() : String {
    }
 }

-private fun createRequestBody(): String {
-    val username = "149002"
-    val password = "Vertretungsplan"
+private fun createRequestBody(username: String, password: String): String {
    val currentDateTime = LocalDateTime.now().toString()

    val requestBody = JSONObject().apply {
@@ -118,11 +121,10 @@ private fun decompressGZIPAndDecodeBase64(compressedData: String): String {
    return outputStream.toString("UTF-8")
 }

-private fun downloadImagesTask(jsonResponse: String, mainDir : File){
+private fun downloadImagesTask(jsonResponse: JSONObject, mainDir : File) : Int {
    clearFolder(mainDir)

-    val jsonResponseObject = JSONObject(jsonResponse)
-    val jsonDaysObject = jsonResponseObject.getJSONArray("ResultMenuItems").getJSONObject(0).getJSONArray("Childs").getJSONObject(0).getJSONObject("Root").getJSONArray("Childs")
+    val jsonDaysObject = jsonResponse.getJSONArray("ResultMenuItems").getJSONObject(0).getJSONArray("Childs").getJSONObject(0).getJSONObject("Root").getJSONArray("Childs")

    for (d in 0 until jsonDaysObject.length()) {
        val jsonDayObject = jsonDaysObject.getJSONObject(d)
@@ -139,9 +141,12 @@ private fun downloadImagesTask(jsonResponse: String, mainDir : File){
            val pageIndex = jsonPageObject.get("Index")
            val imageLink = jsonPageObject.get("Detail").toString()

-            downloadImage(day, URL(imageLink), "$pageIndex.jpg")
+            val downloadState = downloadImage(day, URL(imageLink), "$pageIndex.jpg")
+            if (downloadState != 0)
+                return downloadState
        }
    }
+    return 0
 }

 private fun createDayInformationJson(folder: File, jsonDayObject: JSONObject){
@@ -158,22 +163,29 @@ private fun createDayInformationJson(folder: File, jsonDayObject: JSONObject){
    infoFile.writeText(infoJson.toString())
 }

-private fun downloadImage(folder: File, url: URL, fileName: String){
+private fun downloadImage(folder: File, url: URL, fileName: String) : Int {
    val file = File(folder, fileName)

-    val connection = url.openConnection()
-    val inputStream = connection.getInputStream()
-    val outputStream = FileOutputStream(file)
+    try {
+        val connection = url.openConnection()
+        val inputStream = connection.getInputStream()
+        val outputStream = FileOutputStream(file)

-    val buffer = ByteArray(1024)
-    var bytesRead: Int
+        val buffer = ByteArray(1024)
+        var bytesRead: Int

-    while (inputStream.read(buffer).also { bytesRead = it } != -1) {
-        outputStream.write(buffer, 0, bytesRead)
+        while (inputStream.read(buffer).also { bytesRead = it } != -1) {
+            outputStream.write(buffer, 0, bytesRead)
+        }
+
+        inputStream.close()
+        outputStream.close()
    }
-
-    inputStream.close()
-    outputStream.close()
+    catch (e: SocketException){
+        Log.d("ImageDownloader", e.toString())
+        return NO_INTERNET_CONNECTION_CODE
+    }
+    return 0
 }

 private fun createDataFolder(context: Context) : File {
--- a/app/src/main/java/com/schoolapp/cleverclass/DSBLoginActivity.kt
+++ b/app/src/main/java/com/schoolapp/cleverclass/DSBLoginActivity.kt
@@ -0,0 +1,316 @@
+package com.schoolapp.cleverclass
+
+import android.content.Context
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.foundation.text.selection.TextSelectionColors
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.material.icons.outlined.Delete
+import androidx.compose.material.icons.outlined.Info
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextFieldDefaults
+import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.input.PasswordVisualTransformation
+import androidx.compose.ui.text.input.VisualTransformation
+import androidx.compose.ui.unit.dp
+import com.schoolapp.cleverclass.ui.theme.CleverClassTheme
+import com.schoolapp.cleverclass.ui.theme.InputPrimaryColor
+import com.schoolapp.cleverclass.ui.theme.InputSecondaryColor
+
+private lateinit var activityType : String
+
+class DSBLoginActivity : ComponentActivity() {
+    companion object{
+        const val TYPE_KEY = "type_key"
+    }
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        activityType = intent.getStringExtra(TYPE_KEY).toString()
+
+        setContent {
+            CleverClassTheme {
+                Surface(
+                    modifier = Modifier.fillMaxSize(),
+                    color = MaterialTheme.colorScheme.background
+                ) {
+                    DSBLoginContent(activity = this)
+                }
+            }
+        }
+    }
+}
+
+
+// Content of DSBLogin
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun DSBLoginContent(activity: ComponentActivity){
+    val inputFieldColors = TextFieldDefaults.outlinedTextFieldColors(
+        textColor = MaterialTheme.colorScheme.onPrimaryContainer,
+        containerColor = MaterialTheme.colorScheme.secondaryContainer,
+        cursorColor = InputPrimaryColor,
+        selectionColors = TextSelectionColors(
+            handleColor = InputPrimaryColor,
+            backgroundColor = InputSecondaryColor
+        ),
+        focusedBorderColor = InputSecondaryColor,
+        unfocusedBorderColor = Color.Transparent
+    )
+
+    val sharedPreferences = activity.getSharedPreferences("DSBmobile", Context.MODE_PRIVATE)
+    val editor = sharedPreferences.edit()
+
+    var username by remember {
+        mutableStateOf(sharedPreferences.getString("username", "").toString())
+    }
+    var password by remember {
+        mutableStateOf(sharedPreferences.getString("password", "").toString())
+    }
+    var showPassword by remember {
+        mutableStateOf(false)
+    }
+
+    var showInfo by remember {
+        mutableStateOf(false)
+    }
+    var showDeleteConfirmation by remember {
+        mutableStateOf(false)
+    }
+
+    Column {
+        TopAppBar(
+            colors = TopAppBarDefaults.centerAlignedTopAppBarColors(MaterialTheme.colorScheme.primaryContainer),
+            title = { Text(text = "") },
+            navigationIcon = {
+                IconButton(onClick = { activity.finish() }) {
+                    Icon(
+                        imageVector = Icons.Filled.ArrowBack,
+                        contentDescription = null,
+                        modifier = Modifier.size(28.dp),
+                        tint = MaterialTheme.colorScheme.onPrimaryContainer
+                    )
+                }
+            },
+            modifier = Modifier.fillMaxWidth()
+        )
+
+        Column(
+            verticalArrangement = Arrangement.Center,
+            modifier = Modifier
+                .fillMaxHeight()
+                .verticalScroll(rememberScrollState())
+        ) {
+            Surface(
+                color = MaterialTheme.colorScheme.primaryContainer,
+                shape = RoundedCornerShape(20),
+                modifier = Modifier.padding(16.dp)
+            ) {
+                Column(horizontalAlignment = Alignment.CenterHorizontally,
+                    modifier = Modifier.padding(16.dp)
+                ) {
+                    Row(verticalAlignment = Alignment.CenterVertically) {
+                        Text(
+                            text = "DSBmobile Login Daten",
+                            style = MaterialTheme.typography.labelMedium,
+                            color = MaterialTheme.colorScheme.onPrimaryContainer,
+                            modifier = Modifier.padding(10.dp)
+                        )
+                        
+                        Spacer(modifier = Modifier.weight(1f))
+                        
+                        if (activityType == "Settings")
+                            IconButton(onClick = { showDeleteConfirmation = !showDeleteConfirmation }) {
+                                Icon(
+                                    imageVector = Icons.Outlined.Delete,
+                                    contentDescription = null,
+                                    modifier = Modifier.size(28.dp),
+                                    tint = MaterialTheme.colorScheme.onPrimaryContainer
+                                )
+                            }
+                        else if (activityType == "FirstTime")
+                            IconButton(onClick = { showInfo = !showInfo }) {
+                                Icon(
+                                    imageVector = Icons.Outlined.Info,
+                                    contentDescription = null,
+                                    tint = MaterialTheme.colorScheme.onPrimaryContainer
+                                )
+                            }
+                    }
+                    
+                    Spacer(modifier = Modifier.height(16.dp))
+
+                    OutlinedTextField(
+                        value = username,
+                        onValueChange = { username = it },
+                        placeholder = {
+                            Text(
+                                text = "Benutzername",
+                                style = MaterialTheme.typography.labelMedium,
+                                color = MaterialTheme.colorScheme.primaryContainer
+                            )
+                        },
+                        modifier = Modifier.fillMaxWidth(),
+                        singleLine = true,
+                        shape = RoundedCornerShape(20),
+                        textStyle = MaterialTheme.typography.labelMedium,
+                        colors = inputFieldColors
+                    )
+
+                    Spacer(modifier = Modifier.height(16.dp))
+
+                    OutlinedTextField(
+                        value = password,
+                        onValueChange = { password = it },
+                        placeholder = {
+                            Text(
+                                text = "Passwort",
+                                style = MaterialTheme.typography.labelMedium,
+                                color = MaterialTheme.colorScheme.primaryContainer
+                            )
+                        },
+                        modifier = Modifier.fillMaxWidth(),
+                        singleLine = true,
+                        shape = RoundedCornerShape(20),
+                        textStyle = MaterialTheme.typography.labelMedium,
+                        colors = inputFieldColors,
+                        visualTransformation = if(showPassword) VisualTransformation.None else PasswordVisualTransformation(),
+                        keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Password),
+                        trailingIcon = {
+                            IconButton(onClick = { showPassword = !showPassword })
+                            {
+                                Image(
+                                    painter = painterResource(
+                                        id = if(showPassword)
+                                            R.drawable.baseline_visibility_24
+                                        else
+                                            R.drawable.baseline_visibility_off_24
+                                    ),
+                                    contentDescription = null,
+                                )
+                            }
+                        }
+                    )
+
+                    Spacer(modifier = Modifier.height(10.dp))
+
+                    Box(
+                        contentAlignment = Alignment.Center,
+                        modifier = Modifier.clickable {
+                            editor.putString("username", username)
+                            editor.putString("password", password)
+                            editor.apply()
+                            activity.finish()
+                        }
+                    ) {
+                        Text(
+                            text = "Speichen",
+                            color = MaterialTheme.colorScheme.secondary,
+                            style = MaterialTheme.typography.labelMedium,
+                            modifier = Modifier.padding(10.dp)
+                        )
+                    }
+                }
+            }
+        }
+    }
+
+    if (showInfo) {
+        AlertDialog(
+            onDismissRequest = { showInfo = false },
+            text = {
+                Text(
+                    text = "Der Benutzername und das Passwort können später in den Einstellungen geändert werden",
+                    color = MaterialTheme.colorScheme.onPrimaryContainer,
+                    style = MaterialTheme.typography.labelMedium)
+            },
+            confirmButton = {
+                Text(
+                    text = "Schließen",
+                    color = MaterialTheme.colorScheme.secondary,
+                    style = MaterialTheme.typography.labelMedium,
+                    modifier = Modifier.clickable { showInfo = false }
+                )
+            },
+            containerColor = MaterialTheme.colorScheme.primaryContainer,
+            modifier = Modifier
+                .padding(5.dp)
+        )
+    }
+
+    if (showDeleteConfirmation) {
+        AlertDialog(
+            onDismissRequest = { showDeleteConfirmation = false },
+            text = {
+                Text(
+                    text = "Möchten Sie wirklich die Anmeldedaten löschen?",
+                    color = MaterialTheme.colorScheme.onPrimaryContainer,
+                    style = MaterialTheme.typography.labelMedium
+                )
+            },
+            confirmButton = {
+                Row(modifier = Modifier.fillMaxWidth()){
+                    Text(
+                        text = "Bestätigen",
+                        color = MaterialTheme.colorScheme.secondary,
+                        style = MaterialTheme.typography.labelMedium,
+                        modifier = Modifier.clickable {
+                            editor.putString("username", "")
+                            editor.putString("password", "")
+                            editor.apply()
+                            showDeleteConfirmation = false
+                            activity.finish()
+                        }
+                    )
+
+                    Spacer(modifier = Modifier.weight(1f))
+
+                    Text(
+                        text = "Abbrechen",
+                        color = MaterialTheme.colorScheme.secondary,
+                        style = MaterialTheme.typography.labelMedium,
+                        modifier = Modifier.clickable { showDeleteConfirmation = false }
+                    )
+                }
+            },
+            containerColor = MaterialTheme.colorScheme.primaryContainer
+        )
+    }
+}
--- a/app/src/main/java/com/schoolapp/cleverclass/NotenActivity.kt
+++ b/app/src/main/java/com/schoolapp/cleverclass/NotenActivity.kt
@@ -323,7 +323,7 @@ fun FachButton(
        }
    }

-    // handles observer creation and disposal
+    // handles observer disposal
    DisposableEffect(Unit) {
        sharedPreferences.registerOnSharedPreferenceChangeListener(observer)
        onDispose {
--- a/app/src/main/java/com/schoolapp/cleverclass/SettingsActivity.kt
+++ b/app/src/main/java/com/schoolapp/cleverclass/SettingsActivity.kt
@@ -8,12 +8,14 @@ import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.layout.wrapContentHeight
@@ -98,6 +100,25 @@ fun SettingsContent(activity: ComponentActivity) {
            Setting(text = "Periodensystem", sharedPreferences, editor)
            Setting(text = "Mebis", sharedPreferences, editor)
            Setting(text = "DSBmobile", sharedPreferences, editor)
+            Spacer(modifier = Modifier.height(16.dp))
+            Divider()
+            Box(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .clickable {
+                        val intent = Intent(activity, DSBLoginActivity::class.java).apply {
+                            putExtra(DSBLoginActivity.TYPE_KEY, "Settings")
+                        }
+                        activity.startActivity(intent)
+                    }
+            ) {
+                Text(
+                    text = "DSBmobile Daten",
+                    color = MaterialTheme.colorScheme.onBackground,
+                    style = MaterialTheme.typography.labelMedium,
+                    modifier = Modifier.padding(16.dp)
+                )
+            }
        }

        // About Button
@@ -123,7 +144,6 @@ fun SettingsContent(activity: ComponentActivity) {
    }
 }

-
@Composable
 fun Setting(text : String, sharedPreferences: SharedPreferences, editor: Editor){
    val checkedState = remember { mutableStateOf(sharedPreferences.getBoolean(text, true)) }
@@ -139,8 +159,10 @@ fun Setting(text : String, sharedPreferences: SharedPreferences, editor: Editor)
            }
        )
        Spacer(modifier = Modifier.width(16.dp))
-        Text(text = text,
+        Text(
+            text = text,
            color = MaterialTheme.colorScheme.onBackground,
-            style = MaterialTheme.typography.labelMedium)
+            style = MaterialTheme.typography.labelMedium
+        )
    }
 }
--- a/app/src/main/java/com/schoolapp/cleverclass/Utilities.kt
+++ b/app/src/main/java/com/schoolapp/cleverclass/Utilities.kt
@@ -1,5 +1,15 @@
 package com.schoolapp.cleverclass

+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+
+
+const val NO_INTERNET_CONNECTION_CODE = -1
+
 fun formatFloat(number: Float): String {
    var formattedString = number.toString()

@@ -9,4 +19,14 @@ fun formatFloat(number: Float): String {
        formattedString = "0.0"

    return formattedString
+}
+
+@Composable
+fun LoadingScreen(){
+    Box(
+        modifier = Modifier.fillMaxSize(),
+        contentAlignment = Alignment.Center
+    ){
+        CircularProgressIndicator()
+    }
 }
--- a/app/src/main/res/drawable/baseline_visibility_24.xml
+++ b/app/src/main/res/drawable/baseline_visibility_24.xml
@@ -0,0 +1,5 @@
+<vector android:height="24dp" android:tint="#000000"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="@android:color/white" android:pathData="M12,4.5C7,4.5 2.73,7.61 1,12c1.73,4.39 6,7.5 11,7.5s9.27,-3.11 11,-7.5c-1.73,-4.39 -6,-7.5 -11,-7.5zM12,17c-2.76,0 -5,-2.24 -5,-5s2.24,-5 5,-5 5,2.24 5,5 -2.24,5 -5,5zM12,9c-1.66,0 -3,1.34 -3,3s1.34,3 3,3 3,-1.34 3,-3 -1.34,-3 -3,-3z"/>
+</vector>
--- a/app/src/main/res/drawable/baseline_visibility_off_24.xml
+++ b/app/src/main/res/drawable/baseline_visibility_off_24.xml
@@ -0,0 +1,5 @@
+<vector android:height="24dp" android:tint="#000000"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="@android:color/white" android:pathData="M12,7c2.76,0 5,2.24 5,5 0,0.65 -0.13,1.26 -0.36,1.83l2.92,2.92c1.51,-1.26 2.7,-2.89 3.43,-4.75 -1.73,-4.39 -6,-7.5 -11,-7.5 -1.4,0 -2.74,0.25 -3.98,0.7l2.16,2.16C10.74,7.13 11.35,7 12,7zM2,4.27l2.28,2.28 0.46,0.46C3.08,8.3 1.78,10.02 1,12c1.73,4.39 6,7.5 11,7.5 1.55,0 3.03,-0.3 4.38,-0.84l0.42,0.42L19.73,22 21,20.73 3.27,3 2,4.27zM7.53,9.8l1.55,1.55c-0.05,0.21 -0.08,0.43 -0.08,0.65 0,1.66 1.34,3 3,3 0.22,0 0.44,-0.03 0.65,-0.08l1.55,1.55c-0.67,0.33 -1.41,0.53 -2.2,0.53 -2.76,0 -5,-2.24 -5,-5 0,-0.79 0.2,-1.53 0.53,-2.2zM11.84,9.02l3.15,3.15 0.02,-0.16c0,-1.66 -1.34,-3 -3,-3l-0.17,0.01z"/>
+</vector>
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -9,4 +9,5 @@
    <string name="title_activity_dsbactivity">DSBActivity</string>
    <string name="title_activity_mebis">MebisActivity</string>
    <string name="title_activity_dsbday_view">DSBDayViewActivity</string>
+    <string name="title_activity_dsblogin">DSBLoginActivity</string>
 </resources>