fix for crash on Android 4.x (NoBackupFilesDir is ApiLevel >= 21)

try to fall back to Samsung fingerprint API even on Android 6
-> 1.0.0c

src/Kp2aBusinessLogic/Io/BuiltInFileStorage.cs

@@ -253,7 +253,7 @@ namespace keepass2android.Io
 			if (ioc.IsLocalFile())
 			{
 				bool requiresPermission = !(ioc.Path.StartsWith(activity.Activity.FilesDir.CanonicalPath)
-												|| ioc.Path.StartsWith(activity.Activity.NoBackupFilesDir.CanonicalPath));
+												|| ioc.Path.StartsWith(IoUtil.GetInternalDirectory(activity.Activity).CanonicalPath));
 				
 				var extDirectory = activity.Activity.GetExternalFilesDir(null);
 				if ((extDirectory != null) && (ioc.Path.StartsWith(extDirectory.CanonicalPath)))

src/Kp2aBusinessLogic/Io/IoUtil.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Text;
 using Android.Content;
+using Android.OS;
 using Java.IO;
 using KeePassLib.Serialization;
 
@@ -53,7 +54,7 @@ namespace keepass2android.Io
 			try
 			{
 				File filesDir = context.FilesDir.CanonicalFile;
-				File noBackupDir = context.NoBackupFilesDir.CanonicalFile;
+				File noBackupDir = GetInternalDirectory(context).CanonicalFile;
 				File ourFile = new File(path).CanonicalFile;
 				//http://www.java2s.com/Tutorial/Java/0180__File/Checkswhetherthechilddirectoryisasubdirectoryofthebasedirectory.htm
 
@@ -93,5 +94,13 @@ namespace keepass2android.Io
 				writeTransaction.CommitWrite();
 			}
 		}
+
+		public static Java.IO.File GetInternalDirectory(Context ctx)
+		{
+			if ((int)Android.OS.Build.VERSION.SdkInt >= 21)
+				return ctx.NoBackupFilesDir;
+			else
+				return ctx.FilesDir;
+		}
 	}
 }

src/Kp2aBusinessLogic/database/edit/LoadDB.cs

@@ -101,7 +101,7 @@ namespace keepass2android
 			}
 			catch (DuplicateUuidsException e)
 			{
-				Kp2aLog.LogUnexpectedError(e);
+				Kp2aLog.Log(e.ToString());
 				Finish(false, _app.GetResourceString(UiStringKey.DuplicateUuidsError) + " " + e.Message + _app.GetResourceString(UiStringKey.DuplicateUuidsErrorAdditional), Exception);
 				return;
 			}

src/keepass2android/FingerprintSetupActivity.cs

@@ -122,6 +122,16 @@ namespace keepass2android
 			if ((int) Build.VERSION.SdkInt >= 23)
 				RequestPermissions(new[] {Manifest.Permission.UseFingerprint}, FingerprintPermissionRequestCode);
 			else
+			{
+				TrySetupSamsung();
+				
+			}
+			FindViewById(Resource.Id.container_fingerprint_unlock).Visibility = _samsungFingerprint == null
+				? ViewStates.Visible
+				: ViewStates.Gone;
+		}
+
+		private bool TrySetupSamsung()
 		{
 			try
 			{
@@ -132,16 +142,13 @@ namespace keepass2android
 					SetError(Resource.String.fingerprint_no_enrolled);
 				}
 				ShowRadioButtons();
+				return true;
 			}
 			catch (Exception)
 			{
 				_samsungFingerprint = null;
+				return false;
 			}
-				
-			}
-			FindViewById(Resource.Id.container_fingerprint_unlock).Visibility = _samsungFingerprint == null
-				? ViewStates.Visible
-				: ViewStates.Gone;
 		}
 
 		string CurrentPreferenceKey
@@ -194,6 +201,8 @@ namespace keepass2android
 				FingerprintModule fpModule = new FingerprintModule(this);
 				if (!fpModule.FingerprintManager.IsHardwareDetected)
 				{
+					//seems like not all Samsung Devices (e.g. Note 4) don't support the Android 6 fingerprint API
+					if (!TrySetupSamsung())
 						SetError(Resource.String.fingerprint_hardware_error);
 					return;
 				}

src/keepass2android/Properties/AndroidManifest_net.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" 
-			android:versionCode="78" 
-			android:versionName="1.0.0-b" 
+			android:versionCode="79" 
+			android:versionName="1.0.0-c" 
 			package="keepass2android.keepass2android" 
 			android:installLocation="auto">
 	<uses-sdk android:minSdkVersion="14" android:targetSdkVersion="23" />

src/keepass2android/settings/DatabaseSettingsActivity.cs

@@ -760,11 +760,12 @@ namespace keepass2android
 
         private IOConnectionInfo ImportFileToInternalDirectory(IOConnectionInfo sourceIoc)
         {
+	        Java.IO.File internalDirectory = IoUtil.GetInternalDirectory(Activity);
             string targetPath = UrlUtil.GetFileName(sourceIoc.Path);
             targetPath = targetPath.Trim("|\\?*<\":>+[]/'".ToCharArray());
             if (targetPath == "")
                 targetPath = "imported";
-            if (new File(Activity.NoBackupFilesDir, targetPath).Exists())
+			if (new File(internalDirectory, targetPath).Exists())
             {
                 int c = 1;
                 var ext = UrlUtil.GetExtension(targetPath);
@@ -775,9 +776,9 @@ namespace keepass2android
                     targetPath = filenameWithoutExt + c;
                     if (!String.IsNullOrEmpty(ext))
                         targetPath += "." + ext;
-				} while (new File(Activity.NoBackupFilesDir, targetPath).Exists());
+				} while (new File(internalDirectory, targetPath).Exists());
             }
-			var targetIoc = IOConnectionInfo.FromPath(new File(Activity.NoBackupFilesDir, targetPath).CanonicalPath);
+			var targetIoc = IOConnectionInfo.FromPath(new File(internalDirectory, targetPath).CanonicalPath);
 
             IoUtil.Copy(targetIoc, sourceIoc, App.Kp2a);
             return targetIoc;