Flutter

BUG! exception in phase 'semantic analysis' in source unit '_BuildScript_' Unsupported class file major version 61

Solution:

I just update distributionUrl value at android\gradle\wrapper\gradle-wrapper.properties to a gradle compatible with my JDK version (19)

distributionUrl=https\://services.gradle.org/distributions/gradle-7.6-all.zip

The solution from GitHub has worked for me. It was no need to downgrade Java JDK. Just changed gradle version in gradle-wrapper properties to 7.1.1 (6.x does not support java 16), and adding the following line in gradle.properties:

cd $HOME/snap/flutter/common/flutter

git checkout v2.10.5

Debian 11 Bullseye

1. After installing the OS, Update the /etc/apt/sources.list

deb http://deb.debian.org/debian bullseye main
deb-src http://deb.debian.org/debian bullseye main

deb http://deb.debian.org/debian-security/ bullseye-security main
deb-src http://deb.debian.org/debian-security/ bullseye-security main

deb http://deb.debian.org/debian bullseye-updates main
deb-src http://deb.debian.org/debian bullseye-updates main

deb http://ftp.hk.debian.org/debian sid main non-free-firmware

2.

Sudo apt update

to update the sources
3.

Fix using

installed telephony version 0.1.1

flutter version 2.10.3

Uploading flutter android sdk 31 version makes an error on google play store.

You uploaded an APK or Android App Bundle which has an activity, activity alias, service or broadcast receiver with intent filter, but without 'android:exported' property set. This file can't be installed on Android 12 or higher. See: developer.android.com/about/versions/12/behavior-changes-12#exported

memory leak error/warning

This error might indicate a memory leak if setState() is being called because another object is retaining a reference to this State object after it has been removed from the tree. To avoid memory leaks, consider breaking the reference to this object during dispose().

Just add this line of code before calling the setstate.

if (!mounted) {
  return;
}
// your setState here

I have spent so many hours just to figure this out. I use wss(secure) for my django websocket. Ive realized that using firebase and firecamp is working perfectly, but in my flutter app websocket connect it does not work. arggg, spending many hours working this error (I initially dont know why the heck is this).

Adding this piece of code in the main.dart file fix my issue. :)

It cause warning error because because of building the widget when the entire widget is not yet build. I added this certain code to wait, after it will rebuild the widget I created in initState.

Add this line of code inside your stream listen function, under initState.

Here is my 2nd flutter(version 2.2.1) app repo: https://github.com/boilinux/flutter-spending-tracker

Here is my flutter(version 2.2.1) first app repo: https://github.com/boilinux/flutter-my-first-app

Base on youtube tutorial.
source: https://www.youtube.com/watch?v=x0uinJvhNxI