Tried to fix bug that due to scoped storage on Android 10 and above no files are displayed in AndroidFileChooserDialog at least on Android 10. Set target SDK version therefore to Android 10 (for details see https://developer.android.com/training/data-storage/use-cases#opt-out-scoped-storage). TODO: remove debug log output after fixing the bug completely

build.gradle

@@ -43,13 +43,13 @@ ext {
 
     /*      Android     */
 
-    androidCompileSdkVersion = 30
+    androidCompileSdkVersion = 29
 
-    androidBuildToolsVersion = "30.0.2"
+    androidBuildToolsVersion = "29.0.2"
 
     androidMinSdkVersion = 21 // TODO: fix SSLv3 / TLS and set back to 16
 
-    androidTargetSdkVersion = 30
+    androidTargetSdkVersion = 29
 
 
     fileChooserDialogVersion = "1.3.0-androidx"

ui/BankingAndroidApp/src/main/AndroidManifest.xml

@@ -10,6 +10,10 @@
     <uses-permission android:name="android.permission.USE_FINGERPRINT" />
     <uses-permission android:name="android.permission.USE_BIOMETRIC" />
 
+
+    <!-- FileChooserDialog for reading PDFs and exporting CSVs -->
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+
     <!-- Both are required for ZXing -->
     <uses-permission android:name="android.permission.CAMERA" />
 
@@ -25,6 +29,7 @@
         android:supportsRtl="true"
         android:hardwareAccelerated="true"
         android:theme="@style/AppTheme"
+        android:requestLegacyExternalStorage="true"
         >
 
         <activity

ui/BankingAndroidApp/src/main/java/net/dankito/banking/ui/android/views/MainActivityFloatingActionMenuButton.kt

@@ -2,6 +2,7 @@ package net.dankito.banking.ui.android.views
 
 import android.Manifest
 import android.content.Context
+import android.os.Environment
 import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import androidx.fragment.app.FragmentActivity
@@ -18,6 +19,7 @@ import net.dankito.filechooserdialog.FileChooserDialog
 import net.dankito.filechooserdialog.model.FileChooserDialogConfig
 import net.dankito.utils.android.extensions.asActivity
 import net.dankito.utils.android.permissions.IPermissionsService
+import org.slf4j.LoggerFactory
 import java.io.File
 
 
@@ -27,6 +29,12 @@ open class MainActivityFloatingActionMenuButton(
     protected val presenter: BankingPresenter
 ) : FloatingActionMenuButton(floatingActionMenu) {
 
+    companion object {
+        // TODO: remove again as soon as bug that no files are displayed in FileChooserDialog (on Android 10 and higher?) is fixed
+        private val log = LoggerFactory.getLogger(MainActivityFloatingActionMenuButton::class.java)
+    }
+
+
     protected lateinit var fabTransferMoney: FloatingActionButton
 
     protected lateinit var fabMoneyTransferFromScanningQrCode: FloatingActionButton
@@ -96,6 +104,13 @@ open class MainActivityFloatingActionMenuButton(
 
     protected open fun showTransferMoneyDialogWithDataFromPdf() {
         (floatingActionMenu.context.asActivity() as? FragmentActivity)?.let { activity ->
+            // TODO: remove again as soon as bug that no files are displayed in FileChooserDialog (on Android 10 and higher?) is fixed
+            log.info("config.initialDirectory = ${presenter.appSettings.lastSelectedOpenPdfFolder}, Environment.getExternalStorageDirectory() = ${Environment.getExternalStorageDirectory()}, " +
+                    "Downloads dir = ${Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)}")
+            log.info("External storage files: ${Environment.getExternalStorageDirectory()?.listFiles()?.map { it.name }}")
+            log.info("getExternalStorageState() = ${Environment.getExternalStorageState()}, isExternalStorageEmulated() = ${Environment.isExternalStorageEmulated()}, " +
+                    "isExternalStorageRemovable() = ${Environment.isExternalStorageRemovable()}")
+
             val config = FileChooserDialogConfig(listOf("*.pdf"), presenter.appSettings.lastSelectedOpenPdfFolder.toFile())
 
             FileChooserDialog().showOpenSingleFileDialog(activity, permissionsService, config) { _, selectedFile ->