viewPager + fragment实现懒加载并且只加载一次

com.example.gzw.viewpagerfragmentlazyloadingdemo int anim abc_fade_in 0x7f010000 int anim abc_fade_out 0x7f010001 int anim abc_grow_fade_in_from_bottom 0x7f010002 int anim abc_popup_enter 0x7f010003 int anim abc_popup_exit 0x7f010004 int anim abc_shrink_fade_out_from_bottom 0x7f010005 int anim abc_slide_in_bottom 0x7f010006 int anim abc_slide_in_top 0x7f010007 int anim abc_slide_out_bottom 0x7f010008 int anim abc_slide_out_top 0x7f010009 int anim abc_tooltip_enter 0x7f01000a int anim abc_tooltip_exit 0x7f01000b int attr actionBarDivider 0x7f020000 int attr actionBarItemBackground 0x7f020001 int attr actionBarPopupTheme 0x7f020002 int attr actionBarSize 0x7f020003 int attr actionBarSplitStyle 0x7f020004 int attr actionBarStyle 0x7f020005 int attr actionBarTabBarStyle 0x7f020006 int attr actionBarTabStyle 0x7f020007 int attr actionBarTabTextStyle 0x7f020008 int attr actionBarTheme 0x7f020009 int attr actionBarWidgetTheme 0x7f02000a int attr actionButtonStyle 0x7f02000b int attr actionDropDownStyle 0x7f02000c int attr actionLayout 0x7f02000d int attr actionMenuTextAppearance 0x7f02000e int attr actionMenuTextColor 0x7f02000f int attr actionModeBackground 0x7f020010 int attr actionModeCloseButtonStyle 0x7f020011 int attr actionModeCloseDrawable 0x7f020012 int attr actionModeCopyDrawable 0x7f020013 int attr actionModeCutDrawable 0x7f020014 int attr actionModeFindDrawable 0x7f020015 int attr actionModePasteDrawable 0x7f020016 int attr actionModePopupWindowStyle 0x7f020017 int attr actionModeSelectAllDrawable 0x7f020018 int attr actionModeShareDrawable 0x7f020019 int attr actionModeSplitBackground 0x7f02001a int attr actionModeStyle 0x7f02001b int attr actionModeWebSearchDrawable 0x7f02001c int attr actionOverflowButtonStyle 0x7f02001d int attr actionOverflowMenuStyle 0x7f02001e int attr actionProviderClass 0x7f02001f int attr actionViewClass 0x7f020020 int attr activityChooserViewStyle 0x7f020021 int attr alertDialogButtonGroupStyle 0x7f020022 int attr alertDialogCenterButtons 0x7f020023 int attr alertDialogStyle 0x7f020024 int attr alertDialogTheme 0x7f020025 int attr allowStacking 0x7f020026 int attr alpha 0x7f020027 int attr alphabeticModifiers 0x7f020028 int attr arrowHeadLength 0x7f020029 int attr arrowShaftLength 0x7f02002a int attr autoCompleteTextViewStyle 0x7f02002b int attr autoSizeMaxTextSize 0x7f02002c int attr autoSizeMinTextSize 0x7f02002d int attr autoSizePresetSizes 0x7f02002e int attr autoSizeStepGranularity 0x7f02002f int attr autoSizeTextType 0x7f020030 int attr background 0x7f020031 int attr backgroundSplit 0x7f020032 int attr backgroundStacked 0x7f020033 int attr backgroundTint 0x7f020034 int attr backgroundTintMode 0x7f020035 int attr barLength 0x7f020036 int attr barrierAllowsGoneWidgets 0x7f020037 int attr barrierDirection 0x7f020038 int attr borderlessButtonStyle 0x7f020039 int attr buttonBarButtonStyle 0x7f02003a int attr buttonBarNegativeButtonStyle 0x7f02003b int attr buttonBarNeutralButtonStyle 0x7f02003c int attr buttonBarPositiveButtonStyle 0x7f02003d int attr buttonBarStyle 0x7f02003e int attr buttonGravity 0x7f02003f int attr buttonIconDimen 0x7f020040 int attr buttonPanelSideLayout 0x7f020041 int attr buttonStyle 0x7f020042 int attr buttonStyleSmall 0x7f020043 int attr buttonTint 0x7f020044 int attr buttonTintMode 0x7f020045 int attr chainUseRtl 0x7f020046 int attr checkboxStyle 0x7f020047 int attr checkedTextViewStyle 0x7f020048 int attr closeIcon 0x7f020049 int attr closeItemLayout 0x7f02004a int attr collapseContentDescription 0x7f02004b int attr collapseIcon 0x7f02004c int attr color 0x7f02004d int attr colorAccent 0x7f02004e int attr colorBackgroundFloating 0x7f02004f int attr colorButtonNormal 0x7f020050 int attr colorControlActivated 0x7f020051 int attr colorControlHighlight 0x7f020052 int attr colorControlNormal 0x7f020053 int attr colorError 0x7f020054 int attr colorPrimary 0x7f020055 int attr colorPrimaryDark 0x7f020056 int attr colorSwitchThumbNormal 0x7f020057 int attr commitIcon 0x7f020058 int attr constraintSet 0x7f020059 int attr constraint_referenced_ids 0x7f02005a int attr content 0x7f02005b int attr contentDescription 0x7f02005c int attr contentInsetEnd 0x7f02005d int attr contentInsetEndWithActions 0x7f02005e int attr contentInsetLeft 0x7f02005f int attr contentInsetRight 0x7f020060 int attr contentInsetStart 0x7f020061 int attr contentInsetStartWithNavigation 0x7f020062 int attr controlBackground 0x7f020063 int attr coordinatorLayoutStyle 0x7f020064 int attr customNavigationLayout 0x7f020065 int attr defaultQueryHint 0x7f020066 int attr dialogCornerRadius 0x7f020067 int attr dialogPreferredPadding 0x7f020068 int attr dialogTheme 0x7f020069 int attr displayOptions 0x7f02006a int attr divider 0x7f02006b int attr dividerHorizontal 0x7f02006c int attr dividerPadding 0x7f02006d int attr dividerVertical 0x7f02006e int attr drawableSize 0x7f02006f int attr drawerArrowStyle 0x7f020070 int attr dropDownListViewStyle 0x7f020071 int attr dropdownListPreferredItemHeight 0x7f020072 int attr editTextBackground 0x7f020073 int attr editTextColor 0x7f020074 int attr editTextStyle 0x7f020075 int attr elevation 0x7f020076 int attr emptyVisibility 0x7f020077 int attr expandActivityOverflowButtonDrawable 0x7f020078 int attr firstBaselineToTopHeight 0x7f020079 int attr font 0x7f02007a int attr fontFamily 0x7f02007b int attr fontProviderAuthority 0x7f02007c int attr fontProviderCerts 0x7f02007d int attr fontProviderFetchStrategy 0x7f02007e int attr fontProviderFetchTimeout 0x7f02007f int attr fontProviderPackage 0x7f020080 int attr fontProviderQuery 0x7f020081 int attr fontStyle 0x7f020082 int attr fontVariationSettings 0x7f020083 int attr fontWeight 0x7f020084 int attr gapBetweenBars 0x7f020085 int attr goIcon 0x7f020086 int attr height 0x7f020087 int attr hideOnContentScroll 0x7f020088 int attr homeAsUpIndicator 0x7f020089 int attr homeLayout 0x7f02008a int attr icon 0x7f02008b int attr iconTint 0x7f02008c int attr iconTintMode 0x7f02008d int attr iconifiedByDefault 0x7f02008e int attr imageButtonStyle 0x7f02008f int attr indeterminateProgressStyle 0x7f020090 int attr initialActivityCount 0x7f020091 int attr isLightTheme 0x7f020092 int attr itemPadding 0x7f020093 int attr keylines 0x7f020094 int attr lastBaselineToBottomHeight 0x7f020095 int attr layout 0x7f020096 int attr layout_anchor 0x7f020097 int attr layout_anchorGravity 0x7f020098 int attr layout_behavior 0x7f020099 int attr layout_constrainedHeight 0x7f02009a int attr layout_constrainedWidth 0x7f02009b int attr layout_constraintBaseline_creator 0x7f02009c int attr layout_constraintBaseline_toBaselineOf 0x7f02009d int attr layout_constraintBottom_creator 0x7f02009e int attr layout_constraintBottom_toBottomOf 0x7f02009f int attr layout_constraintBottom_toTopOf 0x7f0200a0 int attr layout_constraintCircle 0x7f0200a1 int attr layout_constraintCircleAngle 0x7f0200a2 int attr layout_constraintCircleRadius 0x7f0200a3 int attr layout_constraintDimensionRatio 0x7f0200a4 int attr layout_constraintEnd_toEndOf 0x7f0200a5 int attr layout_constraintEnd_toStartOf 0x7f0200a6 int attr layout_constraintGuide_begin 0x7f0200a7 int attr layout_constraintGuide_end 0x7f0200a8 int attr layout_constraintGuide_percent 0x7f0200a9 int attr layout_constraintHeight_default 0x7f0200aa int attr layout_constraintHeight_max 0x7f0200ab int attr layout_constraintHeight_min 0x7f0200ac int attr layout_constraintHeight_percent 0x7f0200ad int attr layout_constraintHorizontal_bias 0x7f0200ae int attr layout_constraintHorizontal_chainStyle 0x7f0200af int attr layout_constraintHorizontal_weight 0x7f0200b0 int attr layout_constraintLeft_creator 0x7f0200b1 int attr layout_constraintLeft_toLeftOf 0x7f0200b2 int attr layout_constraintLeft_toRightOf 0x7f0200b3 int attr layout_constraintRight_creator 0x7f0200b4 int attr layout_constraintRight_toLeftOf 0x7f0200b5 int attr layout_constraintRight_toRightOf 0x7f0200b6 int attr layout_constraintStart_toEndOf 0x7f0200b7 int attr layout_constraintStart_toStartOf 0x7f0200