Android生命周期哪个事件在生命周期中仅触发一次? [英] Android life cycle which event fired only once during the life cycle?

问题描述

我已经阅读了一些博客并访问了一些站点.我想知道哪个事件在生命周期中仅触发过一次.阅读博客后，我意识到onCreate()方法在生命周期中仅被触发一次.我不知道我是对还是错.现在我的问题是，仅当我更改横向或纵向时，我才想触发任何一次触发的事件，而如果用户更改了方向而不是未触发事件，则在启动活动后，该事件未触发.我想知道在启动活动"后哪个事件仅一次触发.这个onCreate()

I have read some blogs and visited some site. I want to know which event fired only one time during the life cycle. After reading blogs I realize that onCreate() method is fired only once during the life cycle. I don't know I am right or wrong. Now my problem is that I want to fired any event which fired one time only if I change the landscape orientation or portrait orientation than this event not fired means after starting activity if user change the orientation than event not fired. I want to know which event fired only one time after starting Activity. this onCreate()

推荐答案

onCreate和onDestroy id仅触发一次.

onCreate and onDestroy id fired only once.

onCreate:在首次创建活动时调用.在这里，您应该进行所有常规的静态设置:创建视图，将数据绑定到列表等...

onCreate: Called when the activity is first created. This is where you should do all of your normal static set up: create views, bind data to lists, etc...

onDestroy:在活动被销毁之前收到的最后一个呼叫.这可能是因为活动即将结束.

onDestroy: The final call you receive before your activity is destroyed. This can happen either because the activity is finishing.

因此，将事件代码放在onCreate中.(但这取决于您的要求，您尝试执行的代码可能会更改)

第一个onCreate被称为->下一个-> onStart-> onResume-> 您的正在运行"显示您的布局. (无论您输入了什么layout.xml)

first onCreate is called --> Next --> onStart --> onResume --> your Activity is Running is show you your layout. (whatever you have put in your layout.xml)

现在，如果您按 HOME按钮，则它会转到-> onPause-> onStop. (活动不会破坏其在后台运行).现在再次打开活动"，然后转到-> onRestart-> onStart-> onResumme (活动再次运行).

now if you Press HOME Button then its goes to --> onPause --> onStop. (Activity is not Destroy its running in background). now again open Activity its go to --> onRestart --> onStart --> onResumme(activity is running again).

现在，如果您按后退"按钮，则-> onPause-> onStop-> onDestroy.

now if you Press Back Button then --> onPause --> onStop --> onDestroy.

在使用方向更改时停止重新启动活动

android:configChanges="orientation|keyboardHidden".

<activity android:name=".MyActivity"
          android:configChanges="orientation|keyboardHidden"
          android:label="@string/app_name">

如果您要开发API级别13或更高级别，则必须使用

if you developing for API level 13 or higher you must use

android:configChanges="orientation|screenSize"

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