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Activity 在横竖屏切换情况下的生命周期变化

發(fā)布時(shí)間：2024/1/17 编程问答 39 豆豆

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title: Activity 在橫豎屏切換情況下的生命周期變化
date: 2018-04-26 23:05:57
tags: [Activity]
categories: [Mobile,Android]
---

概述

Activity 在橫豎屏切換的時(shí)候,生命周期是不一樣的,本地通過打印 log 的方式,看下區(qū)別.測(cè)試的機(jī)器是 Android6.0 .

不做任何配置的情況下

第一次啟動(dòng)

D/LifeCircleActivity: onCreate() called with: savedInstanceState = [null]Activity對(duì)象的地址:cn.steve.activitylifecycle.LifeCircleActivity@de950fc D/LifeCircleActivity: onStart() called D/LifeCircleActivity: onResume() called

第一次切換成橫屏

D/LifeCircleActivity: onPause() called D/LifeCircleActivity: onSaveInstanceState() called with: outState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]] D/LifeCircleActivity: onStop() called D/LifeCircleActivity: onDestroy() called D/LifeCircleActivity: onCreate() called with: savedInstanceState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]Activity對(duì)象的地址:cn.steve.activitylifecycle.LifeCircleActivity@266fbfb D/LifeCircleActivity: onStart() called D/LifeCircleActivity: onRestoreInstanceState() called with: savedInstanceState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]] D/LifeCircleActivity: onResume() called

再切換成豎屏

D/LifeCircleActivity: onPause() called D/LifeCircleActivity: onSaveInstanceState() called with: outState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]] D/LifeCircleActivity: onStop() called D/LifeCircleActivity: onDestroy() called D/LifeCircleActivity: onCreate() called with: savedInstanceState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]Activity對(duì)象的地址:cn.steve.activitylifecycle.LifeCircleActivity@7e6e82e D/LifeCircleActivity: onStart() called D/LifeCircleActivity: onRestoreInstanceState() called with: savedInstanceState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]] D/LifeCircleActivity: onResume() called

小結(jié)

默認(rèn)情況下，每次旋轉(zhuǎn)屏幕都會(huì)銷毀當(dāng)前的Activity對(duì)象，同時(shí)調(diào)用 onSaveInstanceState 方法，保存當(dāng)前的界面狀態(tài)；之后重新創(chuàng)建 Activity對(duì)象， onCreate 參數(shù)不為空，回調(diào) onRestoreInstanceState 方法進(jìn)行恢復(fù)。

配置 configChanges="orientation"

第一次啟動(dòng)

第一次切換成橫屏

再切換成豎屏

D/LifeCircleActivity: onPause() called D/LifeCircleActivity: onSaveInstanceState() called with: outState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]] D/LifeCircleActivity: onStop() called D/LifeCircleActivity: onDestroy() called D/LifeCircleActivity: onCreate() called with: savedInstanceState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]Activity對(duì)象的地址:cn.steve.activitylifecycle.LifeCircleActivity@7e6e82e D/LifeCircleActivity: onStart() called D/LifeCircleActivity: onRestoreInstanceState() called with: savedInstanceState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]] D/LifeCircleActivity: onResume() called

小結(jié)

配置 orientation 的情況下，和默認(rèn)情況一致。

配置 configChanges="orientation|screenSize"

根據(jù)官方的介紹，這個(gè)兩個(gè)值，在api大于13 之后，應(yīng)該一起使用

第一次啟動(dòng)

第一次切換成橫屏

D/LifeCircleActivity: onConfigurationChanged() called with: newConfig = [{1.0 ?mcc?mnc zh_CN ldltr sw360dp w640dp h336dp 320dpi nrml long land finger -keyb/v/h -nav/h s.11 themeChanged=0 themeChangedFlags=0}]

再切換成豎屏

D/LifeCircleActivity: onConfigurationChanged() called with: newConfig = [{1.0 ?mcc?mnc zh_CN ldltr sw360dp w360dp h616dp 320dpi nrml long port finger -keyb/v/h -nav/h s.12 themeChanged=0 themeChangedFlags=0}]

小結(jié)

當(dāng)配置了 screenSize 。則不會(huì)再銷毀重建了，而是回調(diào) onConfigurationChanged 方法。

總結(jié)

在不做配置默認(rèn)的情況下,Activity 是被銷毀,然后重新啟動(dòng)的.但是在 manifest 中進(jìn)行相應(yīng)的配置之后,就表示 Activity 自行處理配置的更改,將阻止 Activity 的銷毀重新啟動(dòng),而是保持運(yùn)行狀態(tài),并且回調(diào) onConfigurationChanged 方法.官方的建議是萬不得已的情況下才能使用.

參考

AndroidDeveloper
處理運(yùn)行時(shí)變更

轉(zhuǎn)載于:https://www.cnblogs.com/jnienv/p/10575533.html

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