Struggling with opening damn epub file after generation on android

android_extra_manifest.xml

@@ -0,0 +1,7 @@
+<provider
+android:name="android.support.v4.content.FileProvider"
+android:authorities="com.bohdanbobrowski.blog2epub"
+android:exported="false"
+android:grantUriPermissions="true">
+<meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/provider_paths"/>
+</provider>

blog2epub/blog2epub_gui.py

@@ -586,9 +586,15 @@ def _open_epub(self, file_full_path, inst):
         if platform == "win":
             os.startfile(file_full_path)  # type: ignore
         elif platform == "android":
-            file_provider = autoclass("android.support.v4.content.FileProvider")
-            print(file_provider)
-            webbrowser.open(f"content://{file_full_path}")
+            File = autoclass("java.io.File")
+            FileProvider = autoclass("android.support.v4.content.FileProvider")
+            Context = autoclass("android.content.Context")
+            content_uri = FileProvider.getUriForFile(
+                Context,
+                "com.bohdanbobrowski.blog2epub",
+                File(file_full_path),
+            )
+            webbrowser.open(content_uri)
         else:
             opener = "open" if sys.platform == "osx" else "xdg-open"
             subprocess.call([opener, file_full_path])

buildozer.spec

@@ -107,7 +107,7 @@ android.permissions = android.permission.INTERNET, android.permission.WRITE_EXTE
 #android.minapi = 21
 
 # (int) Android SDK version to use
-#android.sdk = 20
+android.sdk = 18
 
 # (str) Android NDK version to use
 #android.ndk = 23b
@@ -147,11 +147,11 @@ android.permissions = android.permission.INTERNET, android.permission.WRITE_EXTE
 
 # (str) Extra xml to write directly inside the <manifest> element of AndroidManifest.xml
 # use that parameter to provide a filename from where to load your custom XML code
-#android.extra_manifest_xml = ./src/android/extra_manifest.xml
+# android.extra_manifest_xml = ./android_extra_manifest.xml
 
 # (str) Extra xml to write directly inside the <manifest><application> tag of AndroidManifest.xml
 # use that parameter to provide a filename from where to load your custom XML arguments:
-#android.extra_manifest_application_arguments = ./src/android/extra_manifest_application_arguments.xml
+# android.extra_manifest_application_arguments = ./android_extra_manifest.xml
 
 # (str) Full name including package path of the Java class that implements Python Service
 # use that parameter to set custom Java class which extends PythonService
@@ -167,7 +167,7 @@ android.permissions = android.permission.INTERNET, android.permission.WRITE_EXTE
 #android.whitelist_src =
 
 # (str) Path to a custom blacklist file
-#android.blacklist_src =
+# android.blacklist_src = ./tests/*.py
 
 # (list) List of Java .jar files to add to the libs so that pyjnius can access
 # their classes. Don't add jars that you do not need, since extra jars can slow