Flutter_file_picker: The plugin file_picker could not be built due to the issue above with Flutter 1.12.13+hotfix.9

Created on 3 Apr 2020 · 87Comments · Source: miguelpruivo/flutter_file_picker

My project is migrated to AndroidX and worked earlier with Flutter version 1.12.13+hotfix.7 and FilePicker version 1.4.3+2

Flutter Doctor output:

[√] Flutter (Channel stable, v1.12.13+hotfix.9, on Microsoft Windows [Version 10.0.18363.657], locale en-US)
    • Flutter version 1.12.13+hotfix.9 at C:\flutter
    • Framework revision f139b11009 (4 days ago), 2020-03-30 13:57:30 -0700
    • Engine revision af51afceb8
    • Dart version 2.7.2


[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    • Android SDK at C:\Users\BLiyanage\AppData\Local\Android\sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-29, build-tools 29.0.3
    • ANDROID_HOME = C:\Users\BLiyanage\AppData\Local\Android\sdk
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
    • All Android licenses accepted.

[√] Android Studio (version 3.6)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin version 43.0.2
    • Dart plugin version 192.7761
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)

[√] IntelliJ IDEA Community Edition (version 2019.3)
    • IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.3
    • Flutter plugin version 44.0.3
    • Dart plugin version 193.6494.35

[√] VS Code, 32-bit edition
    • VS Code at C:\Program Files (x86)\Microsoft VS Code
    • Flutter extension version 3.4.1

[√] VS Code, 64-bit edition (version 1.42.1)
    • VS Code at C:\Program Files\Microsoft VS Code
    • Flutter extension version 3.4.1

[!] Connected device
    ! No devices available

! Doctor found issues in 1 category.

Error log:

Deprecated Gradle features were used in this build, making it incompatible with Gradle 6.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/5.1.1/userguide/command_line_interface.html#sec:command_line_warnings
17 actionable tasks: 2 executed, 15 up-to-date

C:\Users\BLiyanage\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\file_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:12: error: cannot find
 symbol
import androidx.lifecycle.DefaultLifecycleObserver;
                         ^
  symbol:   class DefaultLifecycleObserver
  location: package androidx.lifecycle
C:\Users\BLiyanage\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\file_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:19: error: cannot find
 symbol
import io.flutter.embedding.engine.plugins.lifecycle.FlutterLifecycleAdapter;
                                                    ^
  symbol:   class FlutterLifecycleAdapter
  location: package io.flutter.embedding.engine.plugins.lifecycle
C:\Users\BLiyanage\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\file_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:35: error: cannot find
 symbol
            implements Application.ActivityLifecycleCallbacks, DefaultLifecycleObserver {
                                                               ^
  symbol:   class DefaultLifecycleObserver
  location: class FilePickerPlugin
C:\Users\BLiyanage\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\file_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:42: error: method does
 not override or implement a method from a supertype
        @Override
        ^
C:\Users\BLiyanage\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\file_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:46: error: method does
 not override or implement a method from a supertype
        @Override
        ^
C:\Users\BLiyanage\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\file_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:50: error: method does
 not override or implement a method from a supertype
        @Override
        ^
C:\Users\BLiyanage\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\file_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:54: error: method does
 not override or implement a method from a supertype
        @Override
        ^
C:\Users\BLiyanage\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\file_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:58: error: method does
 not override or implement a method from a supertype
        @Override
        ^
C:\Users\BLiyanage\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\file_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:63: error: method does
 not override or implement a method from a supertype
        @Override
        ^
C:\Users\BLiyanage\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\file_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:253: error: cannot fin
d symbol
            this.lifecycle = FlutterLifecycleAdapter.getActivityLifecycle(activityBinding);
                             ^
  symbol:   variable FlutterLifecycleAdapter
  location: class FilePickerPlugin
C:\Users\BLiyanage\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\file_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:254: error: incompatib
le types: FilePickerPlugin.LifeCycleObserver cannot be converted to LifecycleObserver
            this.lifecycle.addObserver(this.observer);
                                           ^
C:\Users\BLiyanage\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\file_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:262: error: incompatib
le types: FilePickerPlugin.LifeCycleObserver cannot be converted to LifecycleObserver
        this.lifecycle.removeObserver(this.observer);
                                          ^
Note: C:\Users\BLiyanage\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\file_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerDelegate.java uses or overri
des a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
12 errors

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileReleaseJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1m 51s


The plugin file_picker could not be built due to the issue above.

android help wanted needs investigation

Source

Blasanka

👍10

Most helpful comment

this work for me:
https://android-developers.googleblog.com/2020/07/preparing-your-build-for-package-visibility-in-android-11.html
update gradle, look the table
classpath 'com.android.tools.build:gradle:X.X.Y'

wcadena on 24 Oct 2020

👍6 🎉1

All 87 comments

@Blasanka this might sound dumb, but have you tried to flutter clean and then flutter build again after upgrading?

I highly doubt that a hotfix could introduce breaking changes at plugin's implementation, but...

miguelpruivo on 3 Apr 2020

Yes, even tried pub cache repair, cleaning building android directory with AS also did not work.

Blasanka on 3 Apr 2020

@Blasanka this looks like project related, otherwise I would say it would not work for _everyone_ as it's complaining to dependencies not found. I'm still at hotfix.8, could you downgrade to hotfix.8 and let me know if it works for you?

Could it be that hotfix.9 introduced breaking changes?

miguelpruivo on 3 Apr 2020

Same issue with the eariler version ^1.4.3+2.

Blasanka on 3 Apr 2020

@Blasanka no, I'm suggesting 1.5.1 and Flutter stable version 1.12.13+hotfix.8

miguelpruivo on 3 Apr 2020

Im on it. Can I know your Dart SDK version? My project version is sdk: ">=2.6.0 <3.0.0"

Blasanka on 3 Apr 2020

This is where I'm currently at:

✓] Flutter (Channel stable, v1.12.13+hotfix.8, on Mac OS X 10.15.4 19E266,
    locale pt-PT)
    • Flutter version 1.12.13+hotfix.8 at /Users/miguelruivo/devtools/flutter
    • Framework revision 0b8abb4724 (7 weeks ago), 2020-02-11 11:44:36 -0800
    • Engine revision e1e6ced81d
    • Dart version 2.7.0

miguelpruivo on 3 Apr 2020

I had a similar a problem, i tried to downgrade the flutter version to 1.12.13+hotfix.8 . But i still have the same error.
The result of building with file_picker: ^1.4.0:

Deprecated` Gradle features were used in this build, making it incompatible with Gradle 6.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/5.1.1/userguide/command_line_interface.html#sec:command_line_warnings
17 actionable tasks: 1 executed, 16 up-to-date

C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:12: error: cannot find symbol
import androidx.lifecycle.DefaultLifecycleObserver;
^
symbol: class DefaultLifecycleObserver
location: package androidx.lifecycle
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:19: error: cannot find symbol
import io.flutter.embedding.engine.plugins.lifecycle.FlutterLifecycleAdapter;
^
symbol: class FlutterLifecycleAdapter
location: package io.flutter.embedding.engine.plugins.lifecycle
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:35: error: cannot find symbol
implements Application.ActivityLifecycleCallbacks, DefaultLifecycleObserver {
^
symbol: class DefaultLifecycleObserver
location: class FilePickerPlugin
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:42: error: method does not override or implement a method from a supertype
@Override
^
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:46: error: method does not override or implement a method from a supertype
@Override
^
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:50: error: method does not override or implement a method from a supertype
@Override
^
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:54: error: method does not override or implement a method from a supertype
@Override
^
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:58: error: method does not override or implement a method from a supertype
@Override
^
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:63: error: method does not override or implement a method from a supertype
@Override
^
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:253: error: cannot find symbol
this.lifecycle = FlutterLifecycleAdapter.getActivityLifecycle(activityBinding);
^
symbol: variable FlutterLifecycleAdapter
location: class FilePickerPlugin
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:254: error: incompatible types: FilePickerPlugin.LifeCycleObserver cannot be converted to LifecycleObserver
this.lifecycle.addObserver(this.observer);
^
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:262: error: incompatible types: FilePickerPlugin.LifeCycleObserver cannot be converted to LifecycleObserver
this.lifecycle.removeObserver(this.observer);
^
Note: C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerDelegate.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
12 errors

FAILURE: Build failed with an exception.

What went wrong:
Execution failed for task ':compileReleaseJavaWithJavac'.

Compilation failed; see the compiler error output for details.
Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
Get more help at https://help.gradle.org

BUILD FAILED in 3s

**The plugin file_picker could not be built due to the issue above.

and my flutter doctor output:**

C:\flutter\bin\flutter.bat doctor --verbose
[√] Flutter (Channel unknown, v1.12.13+hotfix.8, on Microsoft Windows [VersiÃ³n 10.0.18362.720], locale es-ES)
• Flutter version 1.12.13+hotfix.8 at C:\flutter
• Framework revision 0b8abb4724 (8 weeks ago), 2020-02-11 11:44:36 -0800
• Engine revision e1e6ced81d
• Dart version 2.7.0

[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
• Android SDK at C:\Users\LBO880\AppData\Local\Android\Sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-29, build-tools 29.0.2
• ANDROID_HOME = C:\Users\LBO880\AppData\Local\Android\Sdk
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
• All Android licenses accepted.

[√] Android Studio (version 3.6)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 44.0.2
• Dart plugin version 192.7761
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)

[√] Connected device (1 available)
• Android SDK built for x86 • emulator-5554 • android-x86 • Android 10 (API 29) (emulator)

• No issues found!
Process finished with exit code 0

oumi on 5 Apr 2020

@oumi there must be something on your machine that results in this. Maybe gradle version incompatibility? I’m trying to figure what but I can’t seem to be able to replicate the issue as it always builds successfully.

Mind to try the example project provided with the plugin?

Thank you.

miguelpruivo on 5 Apr 2020

@oumi mind to try the solution described here on the Wiki troubleshooting? Thank you.

miguelpruivo on 6 Apr 2020

I have the same issue.

When building the app I get an error specifying that FilePickerDelegate.java uses a deprecated API. And when I want to show the window to select the file, I get the following error:

I/flutter (20357): [FilePicker] Unsupported operation. Method not found. The exception thrown was: MissingPluginException(No implementation found for method ANY on channel file_picker)
E/flutter (20357): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method ANY on channel file_picker)

Plug-in version: 1.6.2 My Flutter version:

Flutter (Channel stable, v1.12.13+hotfix.9, on Microsoft Windows [Version 10.0.18363.720], locale en-US)
    • Flutter version 1.12.13+hotfix.9 at 
    • Framework revision f139b11009 (10 days ago), 2020-03-30 13:57:30 -0700
    • Engine revision af51afceb8
    • Dart version 2.7.2

In the GeneratedPluginRegistrant.java I can't find the plugin. I tried the solution from the Wiki section, and multiple cleans and builds, but nothing worked.

phillausofia on 9 Apr 2020

@phillausofia looks like you are still invoking FilePicker.ANY instead of FilePicker.any so I believe that this is some cached package issue (from previous versions).

Make sure you are calling using camelCase enum.

miguelpruivo on 9 Apr 2020

Eventually I found the glitch:

the previous developer copied the file_picker.dart file from the plugin and added it directly to the code, so all the classes where imported from that file. I've deleted that file and all the previous cached versions of the plug-in (there were quite a few) and now it works.

phillausofia on 9 Apr 2020

👍2

I have the same problem with Flutter 1.12.13+hotfix.9 * and *file_picker 1.6.2 . I can't build now

cavinpabua on 13 Apr 2020

@cavinpabua post your logs please.

miguelpruivo on 13 Apr 2020

I had a similar a problem, i tried to downgrade the flutter version to 1.12.13+hotfix.8 . But i still have the same error. The result of building with file_picker: ^1.4.0:

Deprecated` Gradle features were used in this build, making it incompatible with Gradle 6.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/5.1.1/userguide/command_line_interface.html#sec:command_line_warnings
17 actionable tasks: 1 executed, 16 up-to-date

C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:12: error: cannot find symbol
import androidx.lifecycle.DefaultLifecycleObserver;
^
symbol: class DefaultLifecycleObserver
location: package androidx.lifecycle
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:19: error: cannot find symbol
import io.flutter.embedding.engine.plugins.lifecycle.FlutterLifecycleAdapter;
^
symbol: class FlutterLifecycleAdapter
location: package io.flutter.embedding.engine.plugins.lifecycle
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:35: error: cannot find symbol
implements Application.ActivityLifecycleCallbacks, DefaultLifecycleObserver {
^
symbol: class DefaultLifecycleObserver
location: class FilePickerPlugin
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:42: error: method does not override or implement a method from a supertype
@override
^
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:46: error: method does not override or implement a method from a supertype
@override
^
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:50: error: method does not override or implement a method from a supertype
@override
^
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:54: error: method does not override or implement a method from a supertype
@override
^
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:58: error: method does not override or implement a method from a supertype
@override
^
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:63: error: method does not override or implement a method from a supertype
@override
^
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:253: error: cannot find symbol
this.lifecycle = FlutterLifecycleAdapter.getActivityLifecycle(activityBinding);
^
symbol: variable FlutterLifecycleAdapter
location: class FilePickerPlugin
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:254: error: incompatible types: FilePickerPlugin.LifeCycleObserver cannot be converted to LifecycleObserver
this.lifecycle.addObserver(this.observer);
^
C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:262: error: incompatible types: FilePickerPlugin.LifeCycleObserver cannot be converted to LifecycleObserver
this.lifecycle.removeObserver(this.observer);
^
Note: C:\flutter.pub-cache\hosted\pub.dartlang.orgfile_picker-1.5.1\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerDelegate.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
12 errors

FAILURE: Build failed with an exception.

What went wrong:
Execution failed for task ':compileReleaseJavaWithJavac'.

Compilation failed; see the compiler error output for details.

Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

Get more help at https://help.gradle.org

BUILD FAILED in 3s

**The plugin file_picker could not be built due to the issue above.

and my flutter doctor output:**

C:\flutter\bin\flutter.bat doctor --verbose
[√] Flutter (Channel unknown, v1.12.13+hotfix.8, on Microsoft Windows [VersiÃ³n 10.0.18362.720], locale es-ES)
• Flutter version 1.12.13+hotfix.8 at C:\flutter
• Framework revision 0b8abb4724 (8 weeks ago), 2020-02-11 11:44:36 -0800
• Engine revision e1e6ced81d
• Dart version 2.7.0

[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
• Android SDK at C:\Users\LBO880\AppData\Local\Android\Sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-29, build-tools 29.0.2
• ANDROID_HOME = C:\Users\LBO880\AppData\Local\Android\Sdk
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
• All Android licenses accepted.

[√] Android Studio (version 3.6)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 44.0.2
• Dart plugin version 192.7761
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)

[√] Connected device (1 available)
• Android SDK built for x86 • emulator-5554 • android-x86 • Android 10 (API 29) (emulator)

• No issues found!
Process finished with exit code 0

I have the exact same logged errors as @oumi but with version 1.6.2

cavinpabua on 14 Apr 2020

@cavinpabua this looks like the project needs to me migrated to support v2 (probably that’s a project that started sometime ago). Check the troubleshooting section on the Wiki for Android.

miguelpruivo on 14 Apr 2020

@miguelpruivo I started this project just last month and upon seeing the troubleshooting section all is in order. I have v2 still the error persist. I'm focusing on error: cannot find symbol import androidx.lifecycle.DefaultLifecycleObserver; maybe it gives some lead. maybe this can help

cavinpabua on 15 Apr 2020

@cavinpabua this os odd as if it were because of that, it should happen to _everyone_ that uses the plugin (including myself).

Could you please run the example app provided with the package and let me know if it worked for you?

Thank you.

miguelpruivo on 15 Apr 2020

@cavinpabua after further investigation, and based on your logs, you are using a cached version of 1.5.1. Please, update the plugin to the latest version and see if it still happens for you (you might need to completely remove the cache from your .pub_cache folder).

Also, to all in this thread, please check this answer and see if it helps.

Thank you.

miguelpruivo on 16 Apr 2020

@miguelpruivo I have moved my version to 1.6.2 which is the latest and still got the error below:

C:\Users\user\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.orgfile_picker-1.6.2\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:10: error: cannot find symbol
import androidx.lifecycle.DefaultLifecycleObserver;
^
symbol: class DefaultLifecycleObserver
location: package androidx.lifecycle
C:\Users\user\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.orgfile_picker-1.6.2\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:20: error: cannot find symbol
import io.flutter.embedding.engine.plugins.lifecycle.FlutterLifecycleAdapter;
^
symbol: class FlutterLifecycleAdapter
location: package io.flutter.embedding.engine.plugins.lifecycle
C:\Users\user\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.orgfile_picker-1.6.2\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:36: error: cannot find symbol
implements Application.ActivityLifecycleCallbacks, DefaultLifecycleObserver {
^
symbol: class DefaultLifecycleObserver
location: class FilePickerPlugin
C:\Users\user\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.orgfile_picker-1.6.2\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:43: error: method does not override or implement a
method from a supertype
@Override
^
C:\Users\user\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.orgfile_picker-1.6.2\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:47: error: method does not override or implement a
method from a supertype
@Override
^
C:\Users\user\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.orgfile_picker-1.6.2\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:51: error: method does not override or implement a
method from a supertype
@Override
^
C:\Users\user\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.orgfile_picker-1.6.2\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:55: error: method does not override or implement a
method from a supertype
@Override
^
C:\Users\user\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.orgfile_picker-1.6.2\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:59: error: method does not override or implement a
method from a supertype
@Override
^
C:\Users\user\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.orgfile_picker-1.6.2\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:64: error: method does not override or implement a
method from a supertype
@Override
^
C:\Users\user\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.orgfile_picker-1.6.2\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:251: error: cannot find symbol
this.lifecycle = FlutterLifecycleAdapter.getActivityLifecycle(activityBinding);
^
symbol: variable FlutterLifecycleAdapter
location: class FilePickerPlugin
C:\Users\user\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.orgfile_picker-1.6.2\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:252: error: incompatible types: FilePickerPlugin.L
ifeCycleObserver cannot be converted to LifecycleObserver
this.lifecycle.addObserver(this.observer);
^
C:\Users\user\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.orgfile_picker-1.6.2\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:260: error: incompatible types: FilePickerPlugin.L
ifeCycleObserver cannot be converted to LifecycleObserver
this.lifecycle.removeObserver(this.observer);
^
Note: C:\Users\user\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.orgfile_picker-1.6.2\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerDelegate.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
12 errors

I also have repeatedly deleted the pub.dartlang.org folder manually to ensure clear cache but the error still persist. Am I doing something wrong?

cavinpabua on 16 Apr 2020

After some investigation with reference to stackoverflow and android jetpack
I manually added the following to flutter_file_picker android/build.gradle and reduced the error from 12 to 1 error:

REMAINING ERROR
C:\Users\user\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\file_picker-1.6.2\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:20: error: cannot find symbol import io.flutter.embedding.engine.plugins.lifecycle.FlutterLifecycleAdapter; ^ symbol: class FlutterLifecycleAdapter location: package io.flutter.embedding.engine.plugins.lifecycle 1 error

ADDED TO BUILD.GRADLE
implementation "androidx.lifecycle:lifecycle-runtime:2.2.0"
implementation "androidx.lifecycle:lifecycle-extensions:2.2.0"
annotationProcessor "androidx.lifecycle:lifecycle-compiler:2.2.0"
implementation "androidx.lifecycle:lifecycle-common-java8:2.2.0"

cavinpabua on 16 Apr 2020

@cavinpabua thank you for the effort. Like I said, you shouldn’t need that dependency at all, otherwise it would be happen to all plugin users including myself since V2 support was added.

We need to dig in the origin cause. Have you checked this?

miguelpruivo on 16 Apr 2020

@miguelpruivo yes my whole project is in androidx now.
my project:

android/app/build.gradle
compileSdkVersion 28
targetSdkVersion 28

android/gradle.properties
org.gradle.jvmargs=-Xmx1536M
android.enableR8=true
android.useAndroidX=true
android.enableJetifier=true

cavinpabua on 16 Apr 2020

This is one of those Android mysterious things @cavinpabua, it's not easy specially when I can't replicate it, but I might have found something relevant.

If this is not happening to everyone, leads me to the conclusion that it has to be with Flutter engine itself differences on different versions — and so it seems, like in this open issue.

Basically, some people report to have the same problem with other packages due to some version, and, the one thing that I found in common with _all_ of you on this issue, is that you are running on Windows, while I'm on a Mac, so that's probably something related to the engine + OS platform.

Could you please try to flutter clean then project and then switch to flutter channel master and rebuild it again?

Thank you!

miguelpruivo on 16 Apr 2020

@miguelpruivo Tried flutter clean and flutter channel master with flutter upgrade and upon rebuilding the issue still remains. You mentioned that you're on Mac, I will try to make some virtual machine with Ubuntu Linux and will try to build my project in there. I will get back on this thread.

cavinpabua on 16 Apr 2020

@cavinpabua that's quite an effort, but should point us toward the right direction if that works.

Thank you.

miguelpruivo on 16 Apr 2020

@miguelpruivo I took me sometime to setup the environment but the issues still persist. The logs are as follows:

/home/cavin/Downloads/flutter_linux_v1.12.13+hotfix.9-stable/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.6.2/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:10: error: cannot find symbol
import androidx.lifecycle.DefaultLifecycleObserver;
^
symbol: class DefaultLifecycleObserver
location: package androidx.lifecycle
/home/cavin/Downloads/flutter_linux_v1.12.13+hotfix.9-stable/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.6.2/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:20: error: cannot find symbol
import io.flutter.embedding.engine.plugins.lifecycle.FlutterLifecycleAdapter;
^
symbol: class FlutterLifecycleAdapter
location: package io.flutter.embedding.engine.plugins.lifecycle
/home/cavin/Downloads/flutter_linux_v1.12.13+hotfix.9-stable/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.6.2/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:36: error: cannot find symbol
implements Application.ActivityLifecycleCallbacks, DefaultLifecycleObserver {
^
symbol: class DefaultLifecycleObserver
location: class FilePickerPlugin
/home/cavin/Downloads/flutter_linux_v1.12.13+hotfix.9-stable/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.6.2/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:43: error: method does not override or implement a method from a supertype
@Override
^
/home/cavin/Downloads/flutter_linux_v1.12.13+hotfix.9-stable/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.6.2/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:47: error: method does not override or implement a method from a supertype
@Override
^
/home/cavin/Downloads/flutter_linux_v1.12.13+hotfix.9-stable/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.6.2/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:51: error: method does not override or implement a method from a supertype
@Override
^
/home/cavin/Downloads/flutter_linux_v1.12.13+hotfix.9-stable/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.6.2/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:55: error: method does not override or implement a method from a supertype
@Override
^
/home/cavin/Downloads/flutter_linux_v1.12.13+hotfix.9-stable/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.6.2/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:59: error: method does not override or implement a method from a supertype
@Override
^
/home/cavin/Downloads/flutter_linux_v1.12.13+hotfix.9-stable/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.6.2/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:64: error: method does not override or implement a method from a supertype
@Override
^
/home/cavin/Downloads/flutter_linux_v1.12.13+hotfix.9-stable/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.6.2/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:251: error: cannot find symbol
this.lifecycle = FlutterLifecycleAdapter.getActivityLifecycle(activityBinding);
^
symbol: variable FlutterLifecycleAdapter
location: class FilePickerPlugin
/home/cavin/Downloads/flutter_linux_v1.12.13+hotfix.9-stable/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.6.2/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:252: error: incompatible types: FilePickerPlugin.LifeCycleObserver cannot be converted to LifecycleObserver
this.lifecycle.addObserver(this.observer);
^
/home/cavin/Downloads/flutter_linux_v1.12.13+hotfix.9-stable/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.6.2/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:260: error: incompatible types: FilePickerPlugin.LifeCycleObserver cannot be converted to LifecycleObserver
this.lifecycle.removeObserver(this.observer);
^
Note: /home/cavin/Downloads/flutter_linux_v1.12.13+hotfix.9-stable/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.6.2/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerDelegate.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
12 errors

FAILURE: Build failed with an exception.

What went wrong:
Execution failed for task ':compileReleaseJavaWithJavac'.

Compilation failed; see the compiler error output for details.
Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

cavinpabua on 17 Apr 2020

@cavinpabua does that happen when you run the example app from the plugin?

miguelpruivo on 17 Apr 2020

@miguelpruivo aaaaand yeah the example app from the plugin builds without a problem.
I just wonder why me and @oumi have the same problem where in fact we just use the plugin as usual.
I also want to mention that my project's android language is Kotlin while the example app, I believe, is in Java. Could it be a reason?

cavinpabua on 17 Apr 2020

👍1

@cavinpabua hum, could it be related? I don't know. But I'll try to create an empty project with Kotlin as Android support and see if I can replicate it (I wish I could, worse that errors, are those that you can't replicate in order to implement a fix).

miguelpruivo on 17 Apr 2020

Sorry for not replying before.
Now, i downloaded for the second time the example of @miguelpruivo and it worked without doing anything else (the same example didn't work two weeks before). And i used the last version of file picker on my project also and it worked. I have to say also that i'm using windows. I don't know what's new in this last version...
Any way, many thanks guys!!.
If you need me to check something to help you to find the problem, tell me please.

oumi on 19 Apr 2020

👍1

This still looks like cache issues conflicts to me @oumi, which makes it harder to address. Have you updated your Flutter version in the meantime? Thanks!

miguelpruivo on 19 Apr 2020

Actually, last week i tried a lot of things like upgrading gradle (now i have 5.6.4 version) and i don't think that i did anything else.
May be the combination of the new version of the plugin and the gradle 5.6.4 worked.
Anyway, this is the result of my flutter doctor:

[√] Flutter (Channel unknown, v1.12.13+hotfix.8, on Microsoft Windows [VersiÃ³n 10.0.18362.778], locale es-ES)
• Flutter version 1.12.13+hotfix.8 at C:\flutter
• Framework revision 0b8abb4724 (10 weeks ago), 2020-02-11 11:44:36 -0800
• Engine revision e1e6ced81d
• Dart version 2.7.0

[√] Android Studio (version 3.6)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 44.0.2
• Dart plugin version 192.7761
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)

[√] Connected device (1 available)
• Android SDK built for x86 • emulator-5554 • android-x86 • Android 10 (API 29) (emulator)

• No issues found!

oumi on 19 Apr 2020

@cavinpabua would you mind to set your gradle version to 5.6.4 to see if it might be related and actually provide a fix? 🕵️‍♂️

Thanks @oumi.

miguelpruivo on 20 Apr 2020

@miguelpruivo
The same issue here

[✓] Flutter (Channel beta, v1.17.0, on Linux, locale en_US.UTF-8)
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)

gradle 5.6.4
flutter_file_picker/example works fine

marchellodev on 21 Apr 2020

If example works fine, maybe you can try to see what dependencies have differences on both? Looks like an Android dependencies issue to me.

miguelpruivo on 21 Apr 2020

I've switched to 1.4.3+2 and now everything works.
I haven't noticed much difference between android folder in example and android folder in my project. The main difference is that my project uses kotlin.

marchellodev on 21 Apr 2020

@marchellodev it looks like this is affecting users with Kotlin projects, I'll keep you updated. Switching to 1.4.3 you'll be losing some of the new features such as multiple file extension filters and so on, but if you don't need them as of now, stick with it for now.

miguelpruivo on 21 Apr 2020

👍1

I have the similar issue when i add android:requestLegacyExternalStorage="true" this line to Androidmainfest.xml.The logs are as follows:

/Users/qitianle/Desktop/flutter/.pub-cache/hosted/pub.flutter-io.cn/file_picker-1.6.3+1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:20: 错误: 找不到符号
import io.flutter.embedding.engine.plugins.lifecycle.FlutterLifecycleAdapter;
                                                    ^
  符号:   类 FlutterLifecycleAdapter
  位置: 程序包 io.flutter.embedding.engine.plugins.lifecycle
1 个错误

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileReleaseJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

atheist1 on 22 Apr 2020

@atheist1 also on a Kotlin project?

miguelpruivo on 22 Apr 2020

@atheist1 also on a Kotlin project?
I am not sure about it, I am a new developer to flutter.
but i guess it is a pure flutter project cause it's created by android studio on start a new flutter project choice.
And its build with no error if i don't add the android:requestLegacyExternalStorage="true" but i can pick pdf file on android Q.

atheist1 on 23 Apr 2020

Joining this thread with the same issue.

What I'm using:

```
file_picker: ^1.8.0+1

~ $ flutter --version
Flutter 1.18.0-9.0.pre.38 • channel master • https://github.com/flutter/flutter.git
Framework • revision ffcf1db3ca (11 hours ago) • 2020-04-27 17:41:42 -0700
Engine • revision 4bcfae82c7
Tools • Dart 2.9.0 (build 2.9.0-3.0.dev a69cb6d700)

I'm on macOS Catalina 10.15.4 19E287 x86_64
```

The issue when building my application for android:

```
/Users/jagmit/dev/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.8.0+1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:10: error: cannot find symbol
import androidx.lifecycle.DefaultLifecycleObserver;
^
symbol: class DefaultLifecycleObserver
location: package androidx.lifecycle
/Users/jagmit/dev/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.8.0+1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:20: error: cannot find symbol
import io.flutter.embedding.engine.plugins.lifecycle.FlutterLifecycleAdapter;
^
symbol: class FlutterLifecycleAdapter
location: package io.flutter.embedding.engine.plugins.lifecycle
/Users/jagmit/dev/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.8.0+1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:36: error: cannot find symbol
implements Application.ActivityLifecycleCallbacks, DefaultLifecycleObserver {
^
symbol: class DefaultLifecycleObserver
location: class FilePickerPlugin
/Users/jagmit/dev/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.8.0+1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:43: error: method does not override or implement a method from a supertype
@Override
^
/Users/jagmit/dev/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.8.0+1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:47: error: method does not override or implement a method from a supertype
@Override
^
/Users/jagmit/dev/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.8.0+1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:51: error: method does not override or implement a method from a supertype
@Override
^
/Users/jagmit/dev/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.8.0+1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:55: error: method does not override or implement a method from a supertype
@Override
^
/Users/jagmit/dev/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.8.0+1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:59: error: method does not override or implement a method from a supertype
@Override
^
/Users/jagmit/dev/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.8.0+1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:64: error: method does not override or implement a method from a supertype
@Override
^
/Users/jagmit/dev/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.8.0+1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:253: error: cannot find symbol
this.lifecycle = FlutterLifecycleAdapter.getActivityLifecycle(activityBinding);
^
symbol: variable FlutterLifecycleAdapter
location: class FilePickerPlugin
/Users/jagmit/dev/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.8.0+1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:254: error: incompatible types: FilePickerPlugin.LifeCycleObserver cannot be converted to LifecycleObserver
this.lifecycle.addObserver(this.observer);
^
/Users/jagmit/dev/flutter/.pub-cache/hosted/pub.dartlang.org/file_picker-1.8.0+1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:262: error: incompatible types: FilePickerPlugin.LifeCycleObserver cannot be converted to LifecycleObserver
this.lifecycle.removeObserver(this.observer);
^
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
12 errors

FAILURE: Build failed with an exception.

What went wrong:
Execution failed for task ':compileReleaseJavaWithJavac'.

Compilation failed; see the compiler error output for details.
Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
Get more help at https://help.gradle.org

BUILD FAILED in 4s

Exception: The plugin file_picker could not be built due to the issue above.

```

What I've already checked/tried:

My application is migrated to androidX
and has to changes required for Android V2 embedded
I've run flutter cleanand flutter pub cache repair
Put android:requestLegacyExternalStorage="true" in my manifest
Building the example project from file_picker does work fine

I'm on macOS so I don't think the issue lies here.
My MainActivity is in Kotlin so this might be a hint.

@miguelpruivo any direction where we could investigate this further?

jagmit on 28 Apr 2020

@jagmit if I have the time, today I'll create a sample project with Kotlin and see if I can replicate it. If so, then that's the main lead. I'll keep in touch.

miguelpruivo on 28 Apr 2020

👍1

Just tried with transforming my MainActivity from Kotlin to Java and the issue is still there.
Same with pointing my manifest directly to the FlutterActivity coming from Flutter itself like:

<activity
            android:name="io.flutter.embedding.android.FlutterActivity"
            ....

jagmit on 28 Apr 2020

@jagmit I believe that it must be some config property, we just need to find which one. Because running the plugin on Java projects works just fine.

miguelpruivo on 28 Apr 2020

Ok, so, basically I created an empty project (with Kotlin support) and was able to immediately build without an error at all (compileSdk: 29) both with android:requestLegacyExternalStorage="true" and not.

minSdkVersion 21
targetSdkVersion 29

So, here my files and please, anyone in this thread, can compare and see if anything helps:

gradle.version=5.6.2

android/build.gradle

buildscript {
    ext.kotlin_version = '1.3.50'
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

miguelpruivo on 30 Apr 2020

Any news on this?

miguelpruivo on 5 May 2020

Any news on this?
It's works fine if i do not add add android:requestLegacyExternalStorage="true"

atheist1 on 7 May 2020

@atheist1 on which version? Then don’t add it at all. That’s only for Android Q versions when your buildSdk is set to 29.

miguelpruivo on 7 May 2020

Bumping this thread, were anyone able to find the culprit for it and/or solution?

miguelpruivo on 8 May 2020

I faced the same issue when creating fresh project is builds fine but with other plugins its not so i tried to check every plugin i use with this plugin and found the issue in keyboard_visibility
it uses sdk 27 may be this is the issue may be not but when i don't use it the app builds

if some one faces the same issue please check your plugins may be one of them has the same issue

for people who need keyboard_visibility to work with this plugin please enter keyboard_visibility plugin in this path
$flutter_home\.pub-cache\hosted\pub.dartlang.org\keyboard_visibility-0.5.6\android\build.gradle and change sdk version manually to 28

mo-ah-dawood on 14 May 2020

👍4

@mo-ah-dawood thank you for your input. Definitely some other plugins might need to be updated and could result in build conflicts. In that case, you should always open an issue with the oldest plugin that needs to be updated.

Nevertheless, I’m not sure if there wasn’t people here that tried it with an empty project.

miguelpruivo on 14 May 2020

I add the same issue : Make sure your images in @drawable are real png. I had this issue with flutter_native_splash plugin. That was the case for me I generated @drawable images online. They come with .png extension but didn't have real png signature. I used photoshop to export them in png and that solved my problem

ZEKOTCH on 4 Jun 2020

创建新项目时，我遇到了同样的问题，但是构建良好，但是使用其他插件却不行，所以我尝试检查我与此插件一起使用的每个插件，发现keyboard_visibility
其中使用sdk 27的问题可能是这个问题，但是当我不使用它构建的应用程序

如果有人遇到相同的问题，请检查您的插件可能是其中一个具有相同的问题

对于需要keyboard_visibility 使用此插件的人，请keyboard_visibility在此路径中输入插件，
$flutter_home\.pub-cache\hosted\pub.dartlang.org\keyboard_visibility-0.5.6\android\build.gradle然后将sdk版本手动更改为28

这种方式解决了问题

HggMing on 11 Jun 2020

😕1

@miguelpruivo Hey ! I am facing this expection while flutter build apk

FAILURE: Build failed with an exception.
Running Gradle task 'assembleRelease'...