My flutter project has a separate dart file for each functionality, So, I tried to import a dart file in a new dart file to access the functionality in that file, but I got this error "Target of URI doesn't exist: 'package:filename.dart'. Try creating the file referenced by the URI, or Try using a URI for a file that does exist"
I tried solutions like restarting the Ide, flutter clean command and pub get, Most of the solutions for the same error have to deal with packages, it can be solved by adding package name in dependencies. But this is a dart file, how do I solve it.
When using the import function and going to the root folder with 'package:*', you need to first write the flutter project folder name, and then after that the file or subfolders.
All this but skipping the 'lib' folder.
As an example:
import 'package:flutterProject/subFolderInLib/filename.dart'
Hope this was understandable and worked! :)
Related
I want my app to be available for the web.
I run this command: flutter create .
I get this error: "Fredi" is not a valid Dart package name.
I know that there shouldn't be any capital letters. However, I do not know how to change the dart package name.
I have already used these packages successfully, but they seem to be changing other things, not the Dart Package Name.
change_app_package_name: ^1.1.0
rename: ^2.0.1
The only thing in my project with the name 'Fredi' is the root folder (original project name). However, I don't know how to change it (file explorer won't let me) and it will probably break things.
What step can I take?
Config Files
app/build.gradle -> applicationId "com.tomasward.fredi"
android manifest -> package="com.tomasward.fredi"
android manifest -> android:label="Fredi"> [I understand this is the name displayed to the user, I've tried changing it but it doesn't fix the error.]
You can run flutter create --project-name "your_valid_package_name" InvalidPackageNameDirectory to create a Flutter project in a directory with a non-valid package name.
In an already existing project, you can change the package name by modifying the name property in the pubspec.yaml at the root of the project (see here for more details on the pubspec).
You can probably rename your package name with the help of some dependency that you can find on pub.dev by typing "rename" in the search bar.
All those dependencies will help you rename your package to a lowercase only package name, then you will be able to use the flutter create . command to create the web folder for your app.
Iam using the latest version of objectbox and when i run the "flutter pub run build_runner build" command i get this output: "...Failed to find package root from output directory, generated imports might be incorrect..."
So when i write in main to init ObjectBox:
late ObjectBox objectBox;
ObjectBox is not recognized with import.
Using the import from an tutorial which have the same version does not solve the problem,but the json and g.dart files are generated.
What iam doing wrong?
Let me know if you need more information!
Thanks
You will get the error you are seeing if your ObjectBox files are in the wrong directory. By default, ObjectBox expects objectbox.dart, objectbox.g.dart, and objectbox-model.json to be at the root of your project (i.e. in the lib directory next to the main.dart file. You can move objectbox.dart though. I typically put it in lib/objectbox, but I think that objectbox.dart and the generated files need to exist in the same directory, though I'm not 100% sure about that. Change the directory where objectbox.g.dart and objectbox-model.json are generated by following the instructions below from the ObjectBox README.md. If you wanted to put the files in lib/objectbox you would just change custom to objectbox in the code snippet below:
To customize the directory (relative to the package root) where the
generated files are written, add the following to your pubspec.yaml:
objectbox:
# Writes objectbox-model.json and objectbox.g.dart to lib/custom (and test/custom).
output_dir: custom
# Or optionally specify the lib and test output folder separately.
# output_dir:
# lib: custom
# test: other
As I was trying to change my package name using a package (change_app_package_name). I bumped into this error:-
Old Package Name: com.milanzi.shamba_huru
Updating build.gradle File
Updating Main Manifest file
Updating Debug Manifest file
Updating Profile Manifest file
ERROR:: Unknown Directory structure, both java & kotlin files not found.
Seems the package cannot find either java or kotlin files within the directory.
I have solved by changing the directory name where the MainActivity.kt is placed
For example
First your package name is com.example.app_name
Then you need to change into com.milanzi.shamba_huru (use your own package name)
Run
flutter pub run change_app_package_name:main com.milanzi.shamba_huru
So if the error appears, you just need to create a new folder by name of your package
Before your path was
/android/app/src/main/kotlin/com/example/app_name/MainActivity.kt
Change into
/android/app/src/main/kotlin/com/milanzi/shamba_huru/MainActivity.kt
Now try run against flutter pub run change_app_package_name:main com.milanzi.shamba_huru
NB: If you didn't change the folder name, you can't run it on android. But you can run on IOS.
In my last flutter project, I included files placed in my lib/ directory by using import 'package:app/file_name.dart'.
For example, my file located at lib/app_controller.dart was imported via:
import 'package:app/app_controller.dart'
I just started a new flutter project, and it is giving me the error:
Error: Could not resolve the package 'app' in 'package:app/app_controller.dart'
When I remove the portion package:app/, it builds fine. I find this very strange because my previous project is still building just fine without any changes. Does anyone know what's happening here?
What is allowing my old project to respect package:app/..., but not my new project?
package:app/ would work only for an application that is called app. What is the name of your new application? When you import items from your own project, it goes like this:
package:{{YOUR APPLICATION NAME}}/{{DIRECTORIES}}
What is the name in your pubspec.yaml file? It's usually on the very first line.
it is because a dart class can be imported in two ways(AFAIK),
local import from the root of current file where import is being used for example import '../folder/file.dart
with a package name which should begin from package for example import package:packagename/any_file_in_the_lib_folder.dart, a package will have a pubspec.yml which defines a package name which will be used to import the content of the lib folder of that package, in your case your first project is named app so it respected this import style but your second project isn't respecting it because its not named app but something else.
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