added download button, but without functions

app/src/main/java/com/dano/test1/DatabaseDownloader.kt

@@ -0,0 +1,74 @@
+package com.dano.test1
+
+import android.content.Context
+import android.util.Log
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import java.io.File
+import java.io.FileOutputStream
+
+object DatabaseDownloader {
+
+    private const val DB_NAME = "questionnaire_database"
+    private const val SERVER_DOWNLOAD_URL = "http://49.13.157.44/exported_encrypted_database.db"
+
+    private val client = OkHttpClient()
+
+    fun downloadAndReplaceDatabase(context: Context) {
+        CoroutineScope(Dispatchers.IO).launch {
+            try {
+                Log.d("DOWNLOAD", "Download gestartet: $SERVER_DOWNLOAD_URL")
+
+                val request = Request.Builder()
+                    .url(SERVER_DOWNLOAD_URL)
+                    .build()
+
+                val response = client.newCall(request).execute()
+                if (!response.isSuccessful) {
+                    Log.e("DOWNLOAD", "Fehler beim Download: ${response.code}")
+                    return@launch
+                }
+
+                // Temporäre verschlüsselte Datei speichern
+                val encryptedFile = File(context.cacheDir, "downloaded_encrypted_database.db")
+                response.body?.byteStream()?.use { input ->
+                    FileOutputStream(encryptedFile).use { output ->
+                        input.copyTo(output)
+                    }
+                }
+                Log.d("DOWNLOAD", "Verschlüsselte Datei gespeichert: ${encryptedFile.absolutePath}")
+
+                // Datei entschlüsseln (hier deine echte Entschlüsselungslogik einfügen)
+                val decryptedFile = File(context.cacheDir, "decrypted_database.db")
+                decryptDatabase(encryptedFile, decryptedFile)
+                Log.d("DOWNLOAD", "Datei entschlüsselt: ${decryptedFile.absolutePath}")
+
+                // Alte DB ersetzen
+                val dbFile = context.getDatabasePath(DB_NAME)
+                if (dbFile.exists()) {
+                    if (dbFile.delete()) {
+                        Log.d("DOWNLOAD", "Alte Datenbank gelöscht.")
+                    } else {
+                        Log.e("DOWNLOAD", "Löschen der alten Datenbank fehlgeschlagen!")
+                        return@launch
+                    }
+                }
+                decryptedFile.copyTo(dbFile, overwrite = true)
+
+                Log.d("DOWNLOAD", "Neue Datenbank erfolgreich eingesetzt.")
+
+            } catch (e: Exception) {
+                Log.e("DOWNLOAD", "Fehler beim Download oder Ersetzen der DB", e)
+            }
+        }
+    }
+
+    // Platzhalter für echte Entschlüsselung
+    private fun decryptDatabase(encryptedFile: File, outputFile: File) {
+        // TODO: hier echte Entschlüsselungslogik einfügen
+        encryptedFile.copyTo(outputFile, overwrite = true)
+    }
+}

app/src/main/java/com/dano/test1/DatabaseUploader.kt

@@ -85,4 +85,4 @@ object DatabaseUploader {
             }
         })
     }
-}
+}

app/src/main/java/com/dano/test1/HandlerOpeningScreen.kt

@@ -24,6 +24,7 @@ class HandlerOpeningScreen(private val activity: MainActivity) {
     private lateinit var saveButton: Button
     private lateinit var editButton: Button
     private lateinit var uploadButton: Button
+    private lateinit var downloadButton: Button
 
     private val dynamicButtons = mutableListOf<Button>()
     private val questionnaireFiles = mutableMapOf<Button, String>()
@@ -43,6 +44,7 @@ class HandlerOpeningScreen(private val activity: MainActivity) {
         setupSaveButton()
         setupEditButton()
         setupUploadButton()
+        setupDownloadButton()
 
         if (!editText.text.isNullOrBlank()) {
             buttonLoad.performClick()
@@ -58,6 +60,7 @@ class HandlerOpeningScreen(private val activity: MainActivity) {
         saveButton = activity.findViewById(R.id.saveButton)
         editButton = activity.findViewById(R.id.editButton)
         uploadButton = activity.findViewById(R.id.uploadButton)
+        downloadButton = activity.findViewById(R.id.downloadButton)
 
         val tag = editText.tag as? String ?: ""
         editText.hint = LanguageManager.getText(languageID, tag)
@@ -556,5 +559,16 @@ class HandlerOpeningScreen(private val activity: MainActivity) {
         }
     }
 
+    private fun setupDownloadButton() {
+        downloadButton.text = "Download"
+        downloadButton.setOnClickListener {
+            val clientCode = editText.text.toString().trim()
+
+            GlobalValues.LAST_CLIENT_CODE = clientCode
+
+            Toast.makeText(activity, "Datenbank wird heruntergeladen...", Toast.LENGTH_SHORT).show()
+            DatabaseDownloader.downloadAndReplaceDatabase(activity)
+        }
+    }
 
 }

app/src/main/res/layout/opening_screen.xml

@@ -62,6 +62,15 @@
         app:layout_constraintStart_toStartOf="@id/editText"
         app:layout_constraintTop_toBottomOf="@id/editText" />
 
+    <Button
+        android:id="@+id/downloadButton"
+        android:layout_width="200dp"
+        android:layout_height="42dp"
+        android:layout_marginTop="92dp"
+        app:layout_constraintEnd_toEndOf="@id/editText"
+        app:layout_constraintStart_toStartOf="@id/editText"
+        app:layout_constraintTop_toBottomOf="@id/editText" />
+
     <Button
         android:id="@+id/editButton"
         android:layout_width="72dp"
@@ -90,4 +99,4 @@
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintVertical_bias="0.307" />
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>