Android：在onCreate之后总是调用onResume吗？

Question

我需要知道在onResume被调用至少一次之前是否会有onCreate被调用的实例。感谢。

编辑：从活动生命周期来看，它似乎并非如此。但我想仔细检查。

Answer 1

onResume()永远不会在onCreate()之前调用。

在Activity Lifecycle

中详细了解相关信息

Answer 2

当活动进入前台时，

onResume() 将始终被称为，但永远将在onCreate()之前执行。

Answer 3

您可以参考网站了解更多详情                                                  http://developer.android.com/training/basics/activity-lifecycle/starting.html

Answer 4

我遇到了一个问题，其中被覆盖的onCreate 不被调用。我尝试了调试和日志记录，我发现oncreate没有被调用。

原来我覆盖了错误的onCreate

@Override
    public void onCreate(@Nullable Bundle savedInstanceState, @Nullable PersistableBundle persistentState) {
        super.onCreate(savedInstanceState, persistentState);
    }

这是正确的。

@Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

希望它可以帮助一些可怜的灵魂。 ：）

因此在onResume

之前总会调用正确的onCreate（）

Answer 5

活动有自己的生命周期。只需阅读并查看漂亮的图表：

http://developer.android.com/reference/android/app/Activity.html

onResume不会假设在onCreate之前运行，所以你假设正确。

Answer 6

注意：此答案只需另外一个补充the accepted answers。

如先前的答案所说：

[10/05/2016 06:23:27 > 5c77b6: ERR ] Unhandled Exception: System.AggregateException: One or more errors occurred. (Unable to load DLL 'sni.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)) ---> System.DllNotFoundException: Unable to load DLL 'sni.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E) [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Data.SqlClient.SNINativeMethodWrapper.UnmanagedIsTokenRestricted(IntPtr token, Boolean& isRestricted) [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Data.Win32NativeMethods.IsTokenRestrictedWrapper(IntPtr token) [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Data.ProviderBase.DbConnectionPoolIdentity.GetCurrent() [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Data.ProviderBase.DbConnectionPoolGroup.GetConnectionPool(DbConnectionFactory connectionFactory) [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Data.ProviderBase.DbConnectionFactory.GetConnectionPool(DbConnection owningObject, DbConnectionPoolGroup connectionPoolGroup) [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Data.SqlClient.SqlConnection.Open() [10/05/2016 06:23:27 > 5c77b6: ERR ] at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Open() [10/05/2016 06:23:27 > 5c77b6: ERR ] at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable.Enumerator.MoveNext() [10/05/2016 06:23:27 > 5c77b6: ERR ] at Microsoft.EntityFrameworkCore.Query.QueryMethodProvider.<_ShapedQuery>d__3`1.MoveNext() [10/05/2016 06:23:27 > 5c77b6: ERR ] at Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider.<_TrackEntities>d__15`2.MoveNext() [10/05/2016 06:23:27 > 5c77b6: ERR ] at Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider.ExceptionInterceptor`1.EnumeratorExceptionInterceptor.MoveNext() [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) [10/05/2016 06:23:27 > 5c77b6: ERR ] at CommerceVision.InteractivePurchasingModule.Workflow.DuplicateCheckWorkflowProcessor.<GetUnProcessedEmails>d__4.MoveNext() [10/05/2016 06:23:27 > 5c77b6: ERR ] --- End of stack trace from previous location where exception was thrown --- [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) [10/05/2016 06:23:27 > 5c77b6: ERR ] at CommerceVision.InteractivePurchasingModule.Workflow.DuplicateCheckWorkflowStep.<Process>d__7.MoveNext() [10/05/2016 06:23:27 > 5c77b6: ERR ] --- End of stack trace from previous location where exception was thrown --- [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) [10/05/2016 06:23:27 > 5c77b6: ERR ] at CommerceVision.InteractivePurchasingModule.Workflow.WorkflowEngine.<Execute>d__3.MoveNext() [10/05/2016 06:23:27 > 5c77b6: ERR ] --- End of stack trace from previous location where exception was thrown --- [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) [10/05/2016 06:23:27 > 5c77b6: ERR ] at CommerceVision.IpWorkflowProcessor.Program.<>c.<<ConfigureApplication>b__19_2>d.MoveNext() [10/05/2016 06:23:27 > 5c77b6: ERR ] --- End of inner exception stack trace --- [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions) [10/05/2016 06:23:27 > 5c77b6: ERR ] at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification) [10/05/2016 06:23:27 > 5c77b6: ERR ] at Microsoft.Extensions.CommandLineUtils.CommandLineApplication.Execute(String[] args) [10/05/2016 06:23:27 > 5c77b6: ERR ] at CommerceVision.IpWorkflowProcessor.Program.Main(String[] args)

在Activity Lifecycle和Starting an Activity中了解详情。

来自android-lifecycle的活动生命周期的完整图片，包括片段生命周期：