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
>

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> 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

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>
> * 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

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>
> 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'
}

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:

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

Change this:

```
minSdkVersion 16
```

into this:

```
minSdkVersion 23
```

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][1]


[1]:

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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!

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:

[![screen with error in the console][1]][1]

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:

[![enter image description here][2]][2]


[1]:

[2]: