I am writing uber h3 plugin for flutter. I have working source code but I have problems with creating package more precisely I have problems to bundle libh3.so
Quick overview:
there is uber h3 c source code which is downloaded by. download_deps.sh
then android/build.gradle has build commands
externalNativeBuild {
cmake {
path "../ios/CMakeLists.txt"
}
}
then example/lib/main.dart has some initialization code.
initializeH3((String name) => Platform.isAndroid
? DynamicLibrary.open("lib${name}.so")
: DynamicLibrary.process());
but when I try to build it library file can not be found.
-I tried different locations.
It seems that library native .so is not bundled into application
But I don't konw why
According to tutorial https://flutter.dev/docs/development/platform-integration/c-interop
it should be bundled.
Here is the source code https://github.com/fmatuszewski/h3
I have managed to get this running, the pubspec.yaml was incorrectly formatted and required:
flutter:
plugin:
platforms:
android:
package: com.example.h3
pluginClass: H3Plugin
ios:
pluginClass: H3Plugin
Adding in at the end.
In doing this the package was properly attached.
libh3.so needs to be added into android/src/main/jniLibs to naturally be attached however I also moved the code:
final DynamicLibrary h3 = Platform.isAndroid
? DynamicLibrary.open("libh3.so")
: DynamicLibrary.process();
Back into h3.dart and removed main.dart to get this to run.
I think these were the main issues to get the code running. I had issues working out what was wrong as I am new to plugins - so it was a long process to sit and work out all the ins and outs. In doing this I ended up reworking all of the code to understand what was going on. If none of these points work or you wants eyes on the working code let me know and I can upload it to Github.
Related
This is getting passed back from my exception. This only occurs on web, on ios and android it works perfectly.
Any insight on how to correct this or point me in the right direction will be appreciated.
_newZLibDeflateFilter means that you are using GZipCodec() which related to dart:io library that's currently doesn't support flutter web, in order to decompress your http response you can use archive package
include the package in your YAML file
dependencies:
archive: ^3.3.2
and use GZipDecoder() that's included in the package instead of dart:io GZipCodec()
import 'package:archive/archive_io.dart';
String responseBodyDecompressed = utf8.decode(
GZipDecoder().decodeBytes(response.bodyBytes) //decompression
);
This might be a duplicate of this question. But it has no answer and I will give some details here.
I have created a module with File->New Module->Android Library inside my Flutter plugin's android project. And now I have a structure like below:
|-my_plugin
|-android
|-settings.gradle
|-build.gradle
|-mylibrary
|-build.gradle
/android/settings.gradle:
rootProject.name = 'my_plugin'
include ':mylibrary'
/android/build.gradle:
...
dependencies {
implementation project(':mylibrary')
}
When I build example plugin project (which is automatically created by Flutter CLI) with flutter build apk or flutter run, I get this error:
Project with path ':mylibrary' could not be found in project ':my_plugin'.
Any suggestions?
For those who are still looking for a solution. You can try this.
Instead of putting the below code in the plugin setting.gradle, place it in example/android/settings.gradle
include ':mylibrary'
my goal is to get the example app "working" (counter) with this import line included:
import 'package:firebase_auth/firebase_auth.dart';
I am using VS Code.
I verify the app loads fine w/o this line
I add this line (yes, I am not using it)
I add firebase_auth: '^0.8.0+1' to dependencies in pubspace.yaml
I add apply plugin: 'com.google.gms.google-services' to the bottom of android/app/build.gradle
I add classpath 'com.google.gms:google-services:3.2.1' w/in dependencies in file android/build.gradle
I debug. Build works, no errors. App does not come up on simulator. My "biggest" frustration is I am not given any feedback on what I did wrong.
Q: how do we debug these type of challenges with no feedback?
Q: the reason I stripped flutter <-> firebase to this simple example is because when I went through the examples, I couldn't get the app to load when I added firebase.
Is it completely obvious what I am doing wrong?
I have stumbled upon a problem in importing the package in Flutter, I tried to solve this by running flutter packages get and also shutting down the project in Android studio and reopening it.
import 'package:task_02_category_widget/category.dart';
Here is the line above, and the error I'm running into when I run it gives the following error in the console.
Your application could not be compiled, because its dependencies could
not be established.
The following Dart file:
/Users/username/Documents/flutter_rectangle_2/lib/main.dart
...refers, in an import, to the following library:
package:task_02_category_widget/category.dart
That library is in a package that is not known. Maybe you forgot to
mention it in your pubspec.yaml file?
If task_02_category_widget/category.dart is part of an old project you are reusing you should put it in a folder in your flutter application and include it like "../ folder /task_02_category_widget/category.dart ". If it is part of github repository you have copy pasted from, just copy the file and use the step above. Most probably you are looking for that . In any other case check here to find the source code.
You should have in your project at a file called pubspec.yaml a definition like this:
name: my_app
dependencies:
task_02_category_widget:
Let’s say that your package is laid out as follows:
task_02_category_widget/
lib/
category.dart
Then, you can import it:
import 'package:task_02_category_widget/category.dart';
More information:
https://www.dartlang.org/tools/pub/get-started
https://www.dartlang.org/guides/libraries/create-library-packages
I have a Xamarin.Forms project which needs a QR code scanner. I found ZXing Scanner which seems to be a well established library for such purposes.
I installed it in the corresponding android project which worked without errors. When I wanted to build the app, Resource.Designer.cs was adjusted with the following lines:
global::ZXing.Mobile.Resource.Id.contentFrame = global::my.project.Droid.Resource.Id.contentFrame;
global::ZXing.Mobile.Resource.Layout.zxingscanneractivitylayout = global::my.project.Droid.Resource.Layout.zxingscanneractivitylayout;
global::ZXing.Mobile.Resource.Layout.zxingscannerfragmentlayout = global::my.project.Droid.Resource.Layout.zxingscannerfragmentlayout;
The problem is that I as well get the following errors:
'my.project.Droid.Resource.Id' does not contain a definition for 'contentFrame'
'my.project.Droid.Resource.Layout' does not contain a definition for 'zxingscanneractivitylayout'
'my.project.Droid.Resource.Layout' does not contain a definition for 'zxingscannerfragmentlayout'
I installed ZXing using NuGet but I as well tried to add the dlls manually. I get the same errors. Can anyone help me how to fix this?
Thank you in advance.
It's quite possible that your Resource.Designer.cs is not updating correctly:
Clean Project Build
Remove ZXing package.
Clean Project Build
Add ZXing package
Clean and Build Project once again
If it won't help:
https://kb.xamarin.com/customer/portal/articles/1638018-my-android-resource-designer-cs-file-will-not-update or https://forums.xamarin.com/discussion/13339/resource-designer-cs-not-regenerated/