Flutter: Java uses or overrides a deprecated API

Question

I've been trying to use the auth, firestore firebase in an Android / IOS flutter application, and have been experiencing many different issues, after testing several different versions. Now it's showing me several messages in the build log.

build log

Note: D:\Flutter\SDK\flutter.pub-cache\hosted\pub.dartlang.org\firebase_core-0.4.3+1\android\src\main\java\io\flutter\plugins\firebase\core\FirebaseCorePlugin.java uses or overrides a deprecated API. Note: Recompile with -Xlint:deprecation for details. Note: D:\Flutter\SDK\flutter.pub-cache\hosted\pub.dartlang.org\cloud_firestore-0.13.0+1\android\src\main\java\io\flutter\plugins\firebase\cloudfirestore\CloudFirestorePlugin.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. D8: Cannot fit requested classes in a single dex file (# methods: 81454 > 65536) com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: The number of method references in a .dex file cannot exceed 64K. Learn how to resolve this issue at https://developer.android.com/tools/building/multidex.html at com.android.builder.dexing.D8DexArchiveMerger.getExceptionToRethrow(D8DexArchiveMerger.java:131) at com.android.builder.dexing.D8DexArchiveMerger.mergeDexArchives(D8DexArchiveMerger.java:118) at com.android.build.gradle.internal.transforms.DexMergerTransformCallable.call(DexMergerTransformCallable.java:102) at com.android.build.gradle.internal.tasks.DexMergingTaskRunnable.run(DexMergingTask.kt:444) at com.android.build.gradle.internal.tasks.Workers$ActionFacade.run(Workers.kt:335) at org.gradle.workers.internal.AdapterWorkAction.execute(AdapterWorkAction.java:50) at org.gradle.workers.internal.DefaultWorkerServer.execute(DefaultWorkerServer.java:47) at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1$1.create(NoIsolationWorkerFactory.java:65)

    at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1$1.create(NoIsolationWorkerFactory.java:61)

    at org.gradle.internal.classloader.ClassLoaderUtils.executeInClassloader(ClassLoaderUtils.java:98)
    at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.execute(NoIsolationWorkerFactory.java:61)
    at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:44)
    at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:41)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:416)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102)
    at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
    at org.gradle.workers.internal.AbstractWorker.executeWrappedInBuildOperation(AbstractWorker.java:41)
    at org.gradle.workers.internal.NoIsolationWorkerFactory$1.execute(NoIsolationWorkerFactory.java:56)

    at org.gradle.workers.internal.DefaultWorkerExecutor$3.call(DefaultWorkerExecutor.java:215)
    at org.gradle.workers.internal.DefaultWorkerExecutor$3.call(DefaultWorkerExecutor.java:210)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runExecution(DefaultConditionalExecutionQueue.java:215)
    at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runBatch(DefaultConditionalExecutionQueue.java:164)
    at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.run(DefaultConditionalExecutionQueue.java:131)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)

    at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
    at java.lang.Thread.run(Thread.java:748) Caused by: com.android.tools.r8.CompilationFailedException: Compilation failed to

complete at com.android.tools.r8.utils.t.a(:55) at com.android.tools.r8.D8.run(:11) at com.android.builder.dexing.D8DexArchiveMerger.mergeDexArchives(D8DexArchiveMerger.java:116) ... 34 more Caused by: com.android.tools.r8.utils.AbortException: Error: null, Cannot fit requested classes in a single dex file (# methods: 81454 > 65536) at com.android.tools.r8.utils.Reporter.a(:21) at com.android.tools.r8.utils.Reporter.a(:7) at com.android.tools.r8.dex.VirtualFile.a(:33) at com.android.tools.r8.dex.VirtualFile$h.a(:5) at com.android.tools.r8.dex.ApplicationWriter.a(:13) at com.android.tools.r8.dex.ApplicationWriter.write(:35) at com.android.tools.r8.D8.d(:44) at com.android.tools.r8.D8.b(:1) at com.android.tools.r8.utils.t.a(:23) ... 36 more

FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':app:mergeDexDebug'.

A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: The number of method references in a .dex file cannot exceed 64K. Learn how to resolve this issue at https://developer.android.com/tools/building/multidex.html

• 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 4m 33s

flutter doctor -v

[√] Flutter (Channel stable, v1.12.13+hotfix.5, on Microsoft Windows [Version 10.0.18362.535], locale en-IN)

• • Flutter version 1.12.13+hotfix.5 at D:\Flutter\SDK\flutter

  • Framework revision 27321ebbad (3 weeks ago), 2019-12-10 18:15:01 -0800
  • Engine revision 2994f7e1e6
  • Dart version 2.7.0
  

[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)

• • Android SDK at C:\Users\admin\AppData\Local\Android\sdk

  • Android NDK location not configured (optional; useful for native profiling support)
  • Platform android-29, build-tools 29.0.2
  • Java binary at: D:\Android SDK\jre\bin\java
  • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
  • All Android licenses accepted.
  

[√] Android Studio (version 3.5)

• • Android Studio at D:\Android SDK

  • Flutter plugin version 41.1.2
  • Dart plugin version 191.8593
  • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
  

pubspec

dependencies:
  flutter:
    sdk: flutter
  firebase_auth: ^0.15.3
  cloud_firestore: ^0.13.0+1

build.gradle(android)

dependencies {
        classpath 'com.android.tools.build:gradle:3.5.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.0'
    }

Answer 1

In this case, There are two things are responsible:

1. The package/plugin owner uses older version of flutter SDK or may uses older version of library in his/her package's pubspec.yaml file.

2. You can give a try to flutter upgrade (Which upgrades your flutter SDK version), Flutter Pub Upgrade(Which upgrades your pubspec dependecies) and increasing your minSdkVersion.

• And still if you are facing this issue then you shall find alternative of used packages. But in most of the cases it gives you warnings not an error.

Happy Fluttering!! 💙

Answer 2

I also got errors with my project when using Firebase services(core, auth, cloud firestore), but I decided to get into this problem only when building an appbundle:

fixed it with part of the chosen answer, by increasing minSdkVersion in android/app/build.gradle

from:

defaultConfig {
    ...
    minSdkVersion 21
    ...
}

to:

defaultConfig {
    ...
    minSdkVersion 23
    ...
}

Аnd then the error that I get of project building disappears:

Answer 3

In my case, Open terminal and Run:

1. Run: flutter clean => Clean cache.
2. Run: flutter pub outdated => Findout what libraries need to upgrade.
3. Run: flutter pub upgrade => Upgrade libraries.
4. Run: flutter pub get.
5. Run: flutter run.

Good luck!

Answer 4

In order to use minSdkVersion below 21 you will have to configure your app for multidex like this:

android {
    defaultConfig {
        ...
        minSdkVersion 15 
        targetSdkVersion 28
        multiDexEnabled true
    }
    ...
}

dependencies {
  implementation "androidx.multidex:multidex:2.0.1"
}

After this please run the

flutter pub upgrade
flutter pub get
flutter clean
flutter run

It will still throw the warning after flutter clean, but at least it will be possible for supporting earlier versions. More to check out on official docs

Answer 5

You need to use the following plugin:

dependencies:
  firebase_auth: ^0.15.3
  cloud_firestore: ^0.13.0+1

Don't forget to configure firebase:

https://pub.dev/packages/cloud_firestore#setup

https://pub.dev/packages/firebase_auth#usage

Also in your app/build.gradle, increase the minSdkVersion:

Change this:

minSdkVersion 16

into this:

minSdkVersion 23