When I run the app it get stuck

Launching lib\main.dart on Lenovo A319 in debug mode...
Running Gradle task 'assembleDebug'...
(This is taking an unexpectedly long time.)

It never initialize Gradle nor the dependencies

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48 Answers

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Here is solution in my case.

1. Open your flutter Project directory.
2. Change directory to android directory in your flutter project directory cd android
3. clean gradle ./gradlew clean
4. Build gradle ./gradlew build or you can combine both commands with just ./gradlew clean build (Thanks @daniel for the tip)
5. Now run your flutter project. If you use vscode, press F5. First time gradle running assembleDebug will take time.

PS: Delete gradle in case of all that steps don't work

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flutter run -v showed that I was stuck on

Downloading

This was going to take hours, as for some reason the download speed was ~10kB/s on a decent DSL connection.

Solution:

1. Interrupt gradle build
2. Download the required gradle zip from a fast mirror. e.g.
3. Copy gradle-5.6.2-all.zip to C:\Users\ <MyUsername>\.gradle\wrapper\dists\gradle-5.6.2-all\9st6wgf78h16so49nn74lgtbb (of course the last folder will have a different name on your PC)
4. flutter run and voilà.

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In my case, Windows Firewall was causing this problem. After I disabled it temporarily the problem was gone. Worth giving it a try. Good luck!

4

If you are on Windows: try adding firewall exceptions to your Android Studio.

1. Go to:

   Control Panel\System and Security\Windows Defender Firewall\Allowed apps

2. Hit the button:

   Allow another app

3. Add your new firewall exceptions:

   studio.exe and studio64.exe

I hope this can be useful for you too.

If Running Gradle task assembledebug is taking unexpectedly long time, try updating Gradle in your project. (Downloading latest zip file)

You can follow steps in this answer.

Or try by:

1. Open a project in Android Studio
2. Right-click on android in Projects Panel
3. Go down to Flutter and click on the 'Open Android module in Android Studio'.

(See screenshot for reference)

This should open the project as an Android Project.

4. Now, click on 'gradle' in the right panel.
5. Next, click on 'Execute Gradle Task' icon

This should open a 'Run Anything' window.

6. Now, Run the command gradlew clean
7. and, then run gradlew build
8. If prompted by Android Studio to 'Update Gradle Plugin', do that.

The update would download the required .zip files. And, your apps should work fine after that.

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I am using VS Code on Ubuntu 18.04

For me it was a background download of the appropriate android sdk build tools for my connected device. Running flutter run -v showed that it was downloading android SDK build tools which usually take some time. Once it was done, the flutter app compiled and ran successfully.

Solution

1. Ensure you have installed android sdk tools and added them to the environment path. I assume you have downloaded android sdk tools.

2. Ensure you have installed gradle and added it to the path

3. Ensure you have installed latest dart and flutter sdks

For no 1 and 2 please refer to this post:

Setting up flutter without Android studio

For me what worked was clean wipe the emulator data by AVD Manager

1

There were two reasons for me on Archlinux:

1. I needed to unset TERM which was set to xterm-256color (reference).
2. For some reason, flutter stable was not working for me; so I switched to master with: flutter channel master && flutter upgrade. I'll be able to switch back to flutter stable when the fix in master makes its way into stable (reference).

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This worked for me.I got an issue with license acceptance. First you need to go through the flutter directory and then run the command

C:\Users\thrishool\flutterProjects\flutter>flutter doctor

Then it will display if everything is fine or not.I got an issue that, I didnot accept all the licenses.So you need to accept them all.Now type this in cmd

C:\Users\thrishool\flutterProjects\flutter>flutter doctor --android-licenses

Accept all the licenses and you are good to go.

This problem occurred on my system because of the Zen Kernel.

I installed the Linux-LTS kernel and started system using this.

Then my project backed to compile again.

For me simply the process took too much time. It kept running for about 10 mins and finally the app started running.

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This is likely one of number of issues and some of the recommended troubleshooting can be found here.

1. Check that you are building against an Android sdk that you have installed... in your build.gradle file check the compileSdkVersion.

2. You can try uninstalling and reinstalling the relevant SDK.

3. Some users have reported that they had to resintall Dart.

Without a little more information basic troubleshooting is the best we can offer sorry.

Good luck.

For creating an apk for Android in Flutter this issue sometimes happens. I had the luck of facing this issue as well. Here are the few ways it can be solved:

1. Due to androidX

If you followed recommended route from here:

Try this:

Check with steps in “not recommended” way in above tutorial if every listed files is same as in your project, especially : in root/android/gradle/wrapper/gradle-wrapper.properties set distributionUrl=https\://in root/android/build.gradle, set dependencies { classpath 'com.android.tools.build:gradle:3.3.2' }

check if root/android/app/build.gradle SDK version is set to minimum 28 for: compileSdkVersion 28 and targetSdkVersion 28Thank you.

In my case I forgot to download Google Web Driver. It’s running once I downloaded Google Web Driver.

I used the command "flutter clean" in my project and it returned to work perfectly, please try.Igual a imagem

flutter clean

In Android Studio:

Tools -> Flutter -> Flutter clean.

After that just run the app

I stumbled on this problem when I was running my app without debugging it. Theres two option

1. Start Debugging
2. Run without Debugging

I was doing the second option the whole time which got me stuck in that running graddle loop. I fixed my problem with the first option.

Had the same issue because of the wrong compileSdkVersion in the build.gradle file. Working fine now.

It is taking time on windows 10 as the Android studio needs firewall permission to connect to the device(AVD). There can be another reason that you don't have downloaded full Android SDK on your machine.
To check the issue simply run the command on your terminal/cmd/PowerShell command tool.

flutter doctorflutter doctor

check if SDK is installed or not. Try to install and accept license using the following command

flutter doctor --android-licenses

If this doesn't resolve your problem then go to android studio and Open your Android Studio,

File-> settings->System settings(left tab) ->Android SDK,

go to SDK Tool section in that page,

untick hide obsolete packages,

select Android SDL tools(obsolete) and press apply also install other useful tools according to your convenience.

This helped: check if root/android/app/build.gradle SDK version is set to minimum 28 for: compileSdkVersion 28 and targetSdkVersion 28

Occurs with import of Firestore.

In my case the Android Gradle Plugin Version was not updated to any version at all. So i updated it by right clicking on my project folder, clicked "Open Module Settings" and updated gradle plugin version accordingly.

In my case, I need to update Android SDK built-tools.

Open in Android studio Tools->SDK Manager-SDK tools. Mark Android SDK Built-Tools, press Apply, wait for the update. After updated, press Apply and try to run.

I fixed the issue by switching off my antivirus while running my project in the terminal

To run your project in a terminal simply type --> flutter run

This worked for me:

C:\Users<user>\AndroidStudioProjects<flutter_app>\android> gradlew cleanC:\Users<user>\AndroidStudioProjects<flutter_app>\android> gradlew build

Now run it, for initial build

“Running Gradle task 'assembleDebug'… ”

will take 10-12 mins after that it will be good to go.

1. Download the required gradle zip from a fast mirror:

2. Copy gradle-5.6.2-all.zip to C:\Users
   .gradle\wrapper\dists\gradle-5.6.2-all\9st6wgf78h16so49nn74lgtbb

If this does not work, go to android studio's terminal then run:- flutter run.

See what SDK platform it's asking you. like SDK API 28, 29, or 30. Then goto SDK manager and install the required SDK API. Then restart android studio.

It will work perfectly fine!!

The same problem occurred on my mac in Android Studio 4.1, unfortunately, I forgot to install Java on my machine, try installing Java.

1

This might also be due to developers permission, if you will be using any package which requires devices permission lets say url_launcher and you haven't given permission for that it wont run. Solution for windows is that just run ms-settings:developers this in your command prompt/ powershell and enable for developers option and then it will work fine. and if that doesnt also works then just run flutter clean and flutter create . it will work.

cd android

run this cmd : ./gradlew cleanand this ./gradlew build

How are you !,

After many attempts, nothing they recommended worked for me.

My problem was that I had * .dart files with many lines of code to perform SQL create and insert operations initially in SQLite, I removed those 4072 lines of operations, the file was reduced in size and I no longer had to compile a very code file long, instead, I preloaded the database into assets, and it worked flawlessly! ..

The message that the operation is taking a long time no longer appears, I hope it serves you.

Before, when long file size

After, without SQL code operations

I solved the issue by reinstalling SDK Platform on Android studio for Android API 29

Tools->SDK Manager-SDK Platform

Next go to

Android > app > build.gradle

Make sure you also change

compileSdkVersion 29
targetSdkVersion 29

Be patient, it take longer for the first launch...But, not take forever like before.

good luck

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