android build error Could not get unknown property ‘android’ for project ‘:open_file’ of type org.gradle.api.Project.

Explanation of the problem

In this technical issue, a problem occurred while configuring the project ‘:open_file’ due to the unavailability of certain artifacts in the configuration ‘:open_file:classpath’. Specifically, the error message indicates that the artifacts “builder-4.0.2.jar” and “bundletool-0.13.2.jar” could not be resolved. The error message lists the locations where the artifacts were searched, but they could not be found. In addition, the project could not recognize the property ‘android’ of the project ‘:open_file’ of type org.gradle.api.Project. As a result, the build process fails even after downloading the missing artifact using the provided link.

The technical stack used in this project includes Flutter, Android toolchain, Android Studio, and VS Code. The Flutter version being used is 1.22.3, with the framework revision of 8874f21e79 and the Dart version 2.10.3. The Android toolchain used has version 29.0.3 of the Android SDK, with platform android-29 and build-tools 29.0.3. Android Studio version 4.0 is being used, and the Java version used is OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01). VS Code version 1.51.1 is also installed, with Flutter extension version 3.16.0. Additionally, a connected device, emulator-5554, with the SDK gphone x86 (mobile) and Android 11 (API 30) is available.

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Problem solution for android build error Could not get unknown property ‘android’ for project ‘:open_file’ of type org.gradle.api.Project.

Problem: Gradle Sync Error

The error message can be seen in Android Studio’s Build panel, indicating that the Gradle sync process has failed. The cause of the error can be varied, ranging from issues with dependencies and library versions to network connectivity problems.

Solution:

To resolve this error, developers can try to clean and rebuild the project or update the Gradle version. They can also check if there are any issues with the dependencies or network connection.

Problem: Compatibility Issues:

Another common issue with open_file is compatibility issues. The library may not work with certain versions of Android, devices, or other libraries used in the project. This can result in runtime errors or crashes.

Solution:

To solve this issue, developers can check the minimum and target SDK versions in the project’s build.gradle file, ensure that the correct dependencies and library versions are used, and test the app on different devices and Android versions.

Problem: Build Failed Error

Lastly, developers may encounter build failed errors when using open_file. This can occur when building the project with Gradle or running the app on an emulator or device. The error message may vary, but it can prevent the app from being built or launched.

Solution:

To resolve this error, developers can try to clean and rebuild the project, update the dependencies, or check if there are any issues with the project’s configurations, such as the AndroidManifest.xml or build.gradle files. They can also check if there are any conflicts with other libraries used in the project.

A brief introduction to open_file

1. Open_file can be used to provide access to files in a Flutter app. The open_file package allows users to open files such as PDFs, images, and videos that are stored locally or remotely. This can be accomplished by using the openFile() function, which takes a file path or a URL as input and opens the file or URL in a new activity.

import 'package:open_file/open_file.dart';

void _openFile(String filePath) async {
  final result = await OpenFile.open(filePath);
  print(result);
}

2. open_file can be used to view and edit files on both Android and iOS platforms. With this package, users can view and edit documents, images, videos, and more from within their Flutter apps. This is made possible by the use of the native platform’s default file viewer, which ensures that files are viewed and edited using the best available tool on the device.
3. Open_file can be used to support file sharing between different apps. When users want to share a file from a Flutter app to another app, the open_file package can be used to facilitate the process. The package provides the ability to share a file via an Intent on Android and a UIDocumentInteractionController on iOS, allowing users to select the app they wish to use to handle the file. This can be done using the share() function, which takes a file path as input and shares the file with other apps.

import 'package:open_file/open_file.dart';

void _shareFile(String filePath) async {
  await OpenFile.share(filePath);
}