小编Pet*_*dad的帖子

编译我的项目时,我收到以下错误消息:

Program type already present: com.google.android.gms.internal.measurement.zzabn Message{kind=ERROR, text=Program type already present: com.google.android.gms.internal.measurement.zzabn, sources=[Unknown source file], tool name=Optional.of(D8)}

要么

D8: Program type already present: com.google.android.gms.internal.measurement.zzabo

使用Gradle Log中的以下堆栈跟踪

at com.android.builder.profile.Recorder$Block.handleException(Recorder.java:55)     
at com.android.builder.profile.ThreadRecorder.record(ThreadRecorder.java:104)   
at com.android.build.gradle.internal.pipeline.TransformTask.transform(TransformTask.java:212)\\nat sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73)
at org.gradle.api.internal.project.taskfactory.IncrementalTaskAction.doExecute(IncrementalTaskAction.java:46)
at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:39)
at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:26)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$1.run(ExecuteActionsTaskExecuter.java:121)
at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)
at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)
at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)
at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:110)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:92)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:70)
at org.gradle.api.internal.tasks.execution.OutputDirectoryCreatingTaskExecuter.execute(OutputDirectoryCreatingTaskExecuter.java:51)
at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:62)
at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54)
at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:60)
at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:97)
at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:87)
at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:52)
at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52) …

我尝试将 Android 项目连接到 Firebase，但在将以下内容添加到 pubsec.yaml 时出现此错误：

firebase_auth: ^0.16.0
cloud_firestore: ^0.13.5

当我运行 gradle 但它不起作用时

Plugin project :firebase_core_web not found. Please update settings.gradle.
Plugin project :firebase_auth_web not found. Please update settings.gradle.
Plugin project :cloud_firestore_web not found. Please update settings.gradle.

有什么解决办法吗

我是MySql环境的新用户并安装了:带有以下命令的MySQL:

sudo apt-get update sudo apt-get install mysql-server mysql_secure_installation

并且还安装了mysql workbench.

但是当我尝试连接我的localhost时出现以下错误:

"无法加载身份验证插件'caching_sha2_password':/usr/lib/mysql/plugin/caching_sha2_password.so:无法打开共享对象文件:没有这样的文件或目录"

甚至这是我第一次在stackoverflow中发布一个问题,抱歉我的演示文稿错误和语法.

我是 Flutter 的新手。我有Firebase Auth/Google Auth 的问题FirebaseUser未定义代码：

FirebaseAuth _auth = FirebaseAuth.instance;
GoogleSignIn googleSignIn = GoogleSignIn();

Future<FirebaseUser> currentUser() async { // The Issue is here in the Future<>
  final GoogleSignInAccount account = await googleSignIn.signIn();
  final GoogleSignInAuthentication authentication =
      await account.authentication;

  final GoogleAuthCredential credential = GoogleAuthProvider.getCredential(
      idToken: authentication.idToken, accessToken: authentication.accessToken);

  final AuthResult authResult = await _auth.signInWithCredential(credential);
  final FirebaseUser user = authResult.user; // and here as I can't define this FirebaseUser object to return

  return user;
}

pubspec.yml

dependencies:
  flutter:
    sdk: …

我一直在尝试在 Android / IOS flutter 应用程序中使用 auth、firestore firebase，并且在测试了几个不同的版本后遇到了许多不同的问题。现在它在构建日志中向我显示了几条消息。

构建日志

注意：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 使用或覆盖已弃用的 API。注意：使用 -Xlint:deprecation 重新编译以获取详细信息。注意：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 使用未经检查或不安全的操作。注意：使用 -Xlint:unchecked 重新编译以获取详细信息。D8：无法在单个 dex 文件中容纳请求的类（# 方法：81454 > 65536）com.android.builder.dexing.DexArchiveMergerException：合并 dex 档案时出错：.dex 文件中的方法引用数不能超过 64K。了解如何解决此问题，请访问 https://developer.android.com/tools/building/multidex.html 在 com.android.builder.dexing.D8DexArchiveMerger.getExceptionToRethrow(D8DexArchiveMerger.java:131) 在 com.android.builder.dexing.D8DexArchiveMerger.mergeDexArchives(D8DexArchiveMerger.java:118) 在 com.android.build.transgradle .DexMergerTransformCallable.call(DexMergerTransformCallable.java:102) 在 com.android.build.gradle.internal.tasks.DexMergingTaskRunnable.run(DexMergingTask.kt:444) 在 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) …

Run Code Online (Sandbox Code Playgroud)

Bitrise构建失败,出现以下错误:

配置根项目'src'时出现问题.

无法解析配置':classpath'的所有文件.找不到com.google.gms:google-services:4.1.0.在以下位置进行了搜索: https://dl.google.com/dl/android/maven2/com/google/gms/google-services/4.1.0/google-services-4.1.0.pom https:// dl .google.com/dl/android/maven2/com/google/gms/google-services/4.1.0/google-services-4.1.0.jar https://jcenter.bintray.com/com/google/gms/ google-services/4.1.0/google-services-4.1.0.pom https://jcenter.bintray.com/com/google/gms/google-services/4.1.0/google-services-4.1.0.jar 要求:项目:

我知道使用maven的替代临时解决方案.但有谁知道为什么问题突然发生并且永久解决？

尝试在我的项目中实现Firebase.

Gradle文件:

apply plugin: 'com.android.application'

android {
compileSdkVersion 27
defaultConfig {
    applicationId "com.ghaleh.myapplication"
    minSdkVersion 16
    targetSdkVersion 27
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }


buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support:support-media-compat:27.1.1'
implementation 'com.android.support:support-v4:27.1.1'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-  core:3.0.2'
implementation 'com.google.firebase:firebase-messaging:15.0.2'
}
apply plugin: 'com.google.gms.google-services'

我收到这个错误:

All gms/firebase libraries must use the exact same version specification (mixing versions can lead to runtime crashes). …

我正在使用Android Room Database为我的Android应用程序创建数据库.它在本地完美适用于我,但我无法链接到服务器以使其在线.我正在使用Firebase进行身份验证.我正在尝试使用Firebase实时数据库从Room保存整个数据库对象,并根据经过身份验证的用户在应用启动时加载正确的数据库.

我想问一下这是否可行？如果我可以保存Room数据库的整个实例,或者我需要在Firebase上重新创建数据库并逐项保存我的数据？

我似乎也无法访问Room的数据库数据,因为当我得到AppDatabase类的对象时,它并没有真正传递数据.而且我不知道如何做相反的事情,将以后从Firebase检索到的数据分配给保存的本地数据？

此外,如果使用Firebase无法实现,您是否对我可以使用Room的其他服务器有任何建议？

我正在尝试上传图片，同样的过程适用于我的其他应用程序，但在这里它给出了这些错误，你们能帮忙吗？

Future getImage1() async {
    // ignore: deprecated_member_use
    var firstImage = await ImagePicker.pickImage(
        source: ImageSource.gallery, imageQuality: 65);
    setState(() {
      _image1 = firstImage;
    });
  }

正如标题所说，我想问一下在 Angular Firestore 中执行查询时 get() 和 valueChanges() 之间有什么区别（如果有的话）。

在读取/成本方面，两者之间是否也有任何优点/缺点？