[FIXED] Build Warning : Mapping new ns to old ns

Issue

So, I'm using Flutter and on running the App, I receive errors like these in the debug console:

Warning: Mapping new ns http://schemas.android.com/repository/android/common/02 to old ns http://schemas.android.com/repository/android/common/01

I did flutter clean, but no effect.

I tried the answer here: How to change build tools version in Android Studio

But, when I look for build.gradle file, I have two files one in /android and another in /android/app. But both of these do not have any configuration to change buildToolsVersion.

I did sdkmanager --list_installed and I hae two build-tools versions:

  build-tools;29.0.2   | 29.0.2  | Android SDK Build-Tools 29.0.2 | build-tools/29.0.2  
  build-tools;30.0.2   | 30.0.2  | Android SDK Build-Tools 30.0.2 | build-tools/30.0.2  

What should I do to fix this Warning ?

Also, I am not using Android Studio. I used this guide to install Flutter without Android Studio: How to Install and Configure Flutter Without Android Studio

Solution

Try deleting and reinstalling the SDK platforms. Delete the folders in ~\Android\Sdk\platforms and download the SDKs you need.

Edit: The above somehow resolved the issue before, but I ran into the same problem again when more external packages were updated. This time, deleting the SDK platforms didn't work. Instead, I updated Gradle in two locations in my project:

android/build.gradle

buildscript {
    repositories {
        google()
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:7.2.1' // Update this line
        ...
    }
}

Note: 7.2.1 for the Android Gradle Plugin is the latest stable release present at this time in Google's Maven repository. To check for newer versions, visit https://maven.google.com, or the release notes. Under com.android.tools.build > gradle you will find the versions available for Android.

android/gradle/wrapper/gradle-wrapper.properties

...
distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-all.zip # Update this line

Updating the plugin in these two spots resolved the issue for me this time. Hope this helps.

Answered By - Leviticus
Answer Checked By - Willingham (JavaFixing Volunteer)