什么是Activity，以及Activity的作用。
什么是Activity，以及Activity的作用。
参考答案和解析
Activity 是 Android 应用程序的四大组件之一,它负责管理 Android 应用程序的用户界面,为用户提供可视化界面及操作。一个应用程序通常包含多个 Activity ,每个 Activity 负责管理一个用户界面。这些界面可以添加多个控件,每个控件负责实现不同功能。 在应用程序中, Activity 就像一个界面管理员,用户在界面上的操作是通过 Activity 来管理的。
相关考题：
Project schedule management is made up of six management processes including: activity definition, activity sequencing()and schedule control by order. A.activity duration estimating, schedule developing, activity resource estimatingB.activity resource estimating, activity duration estimating, schedule developmentC.schedule developing, activity resource estimating, activity duration estimatingD.activity resource estimating, schedule developing, activity duration estimating
● Project schedule management is made up of six management processes including: activity definition, activity sequencing, ( 71) , and schedule control by order．（71）A．activity duration estimating, schedule developing, activity resource estimatingB ． activity resource estimating, activity duration estimating, schedule developmentC．schedule developing, activity resource estimating, activity duration estimatingD．activity resource estimating, schedule developing, activity duration estimating
关于Activity的描述,下面哪个是错误的()。 A.系统完全控制Activity的整个生命周期B.一个Android程序中只能拥有一个Activity类C.Activity类都必须在Androidmaniefest.xml中进行声明D.Activity类必须重载onCreate方法
FLAG_ACTIVITY_CLEAR_TO标P记的作用是什么?() A.如果Activity已经在任何栈中启动，则不做任何操作B.如果Activity已经在当前栈中启动，则不做任何操作C.如果Activity已经在当前栈中启动，则所有在该Activity之上的Activity都会被销毁D.如果Activity已经在任何栈中启动，则所有在该Activity之上的Activity都会被销毁
导致一个Activity的onDestroy()方法被调用的原因是什么?() A.该Activity被暂停或者停止，并且它的资源被操作系统回收B.启动该Activity的Activity调用了finishActivity()C.活动(Activity)调用finish()D.三项原因都是
下列关于Activity的描述,错误的是( ) A.Activity是Android的四大组件之一B.Activity有4种启动模式C.Activity通常用于开启一个广播事件D.Activity就像一个界面管理员,用户在界面上的操作是通过Activity来管理的。
In project time management, activity definition is the process of identifying and documenting the specific action to be performed to produce the project deliverables. （）are not output of activity definition.A.Activity listB.Work Breakdown StructuresC.Activity AttributesD.Milestone Lists
What is the teacher doing by saying this in terms of instruction "Now, did the questions help you understand the text better "A.Observing the activity．B.Evaluating the activity．C.Monitoring the activity．D.Controlling the activity．
Project schedule management is made up of six management processes including: activity definition, activity sequencing, （ ） , and schedule control by order． A.activity duration estimating, schedule developing, activity resource estimating B.activity resource estimating, activity duration estimating, schedule development C.schedule developing, activity resource estimating, activity duration estimating D.activity resource estimating, schedule developing, activity duration estimating
Service中如何实现更改Activity界面元素（）A、通过把当前activity对象传递给service对象B、通过向Activity发送广播C、通过Context对象更改Activity界面元素D、可以在Service中，调用Activity的方法实现更改界面元素
导致一个Activity的onDestroy（）方法被调用的原因是什么？（）A、该Activity被暂停或者停止，并且它的资源被操作系统回收B、启动该Activity的Activity调用了finishActivity（）C、活动Activity调用finish（）D、A、B、C选项都是
当Activity被消毁时，如何保存它原来的状态（）。A、实现Activity的onSaveInstanceState（）方法B、实现Activity的onSaveInstance（）方法C、实现Activity的onInstanceState（）方法D、实现Activity的onSaveState（）方法
当Activity被销毁时，保存它原来状态的方法是（）A、实现Activity的onSaveInstanceState（）方法B、实现Activity的onSaveInstance（）方法C、实现Activity的onInstanceState（）方法D、实现Activity的onSaveState（）方法
在AndroidManifes.xml中描述一个Activity时，该Activity的label属性是指定什么（）A、指定Activity的图标B、指定Activity的显示图标C、指定Activity和类相关联的类名D、指定该Activity的唯一标识
以下哪个不是Activity启动时的正确标志？（）A、FLAG_ACTIVITY_CLEAR_TOPB、FLAG_ACTIVITY_SINGLE_TASKC、FLAG_ACTIVITY_SINGLE_TOPD、FLAG_ACTIVITY_NEW_TASK
FLAG_ACTIVITY_CLEAR_TOP标记的作用是什么？（）A、如果Activity已经在任何栈中启动，则不做任何操作B、如果Activity已经在当前栈中启动，则不做任何操作C、如果Activity已经在当前栈中启动，则所有在该Activity之上的Activity都会被销毁D、如果Activity已经在任何栈中启动，则所有在该Activity之上的Activity都会被销毁
Project schedule management is made up of six management processes including: activity definition, activity sequencing（）and schedule control by order.A、activity duration estimating, schedule developing, activity resource estimatingB、activity resource estimating, activity duration estimating, schedule developmentC、schedule developing, activity resource estimating, activity duration estimatingD、activity resource estimating, schedule developing, activity duration estimating
单选题在AndroidManifes.xml中描述一个Activity时，该Activity的label属性是指定什么（）A指定Activity的图标B指定Activity的显示图标C指定Activity和类相关联的类名D指定该Activity的唯一标识
单选题当Activity被销毁时，保存它原来状态的方法是（）A实现Activity的onSaveInstanceState（）方法B实现Activity的onSaveInstance（）方法C实现Activity的onInstanceState（）方法D实现Activity的onSaveState（）方法
单选题当Activity被消毁时，如何保存它原来的状态（）。A实现Activity的onSaveInstanceState（）方法B实现Activity的onSaveInstance（）方法C实现Activity的onInstanceState（）方法D实现Activity的onSaveState（）方法
单选题Project schedule management is made up of six management processes including: activity definition, activity sequencing（）and schedule control by order.Aactivity duration estimating, schedule developing, activity resource estimatingBactivity resource estimating, activity duration estimating, schedule developmentCschedule developing, activity resource estimating, activity duration estimatingDactivity resource estimating, schedule developing, activity duration estimating
单选题What is the teacher doing by saying this in terms of instruction？“Now，did the questions help you understand the text better？”AObserving the activity.BEvaluating the activity.CMonitoring the activity.DControlling the activity.
单选题以下哪个不是Activity启动时的正确标志？（）AFLAG_ACTIVITY_CLEAR_TOPBFLAG_ACTIVITY_SINGLE_TASKCFLAG_ACTIVITY_SINGLE_TOPDFLAG_ACTIVITY_NEW_TASK
单选题导致一个Activity的onDestroy（）方法被调用的原因是什么？（）A该Activity被暂停或者停止，并且它的资源被操作系统回收B启动该Activity的Activity调用了finishActivity（）C活动Activity调用finish（）DA、B、C选项都是