Firebase – Flutter: Java uses or overrides a deprecated API

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'
    }