用RecyclerView实现字母排序

int anim abc_fade_in 0x7f050000 int anim abc_fade_out 0x7f050001 int anim abc_grow_fade_in_from_bottom 0x7f050002 int anim abc_popup_enter 0x7f050003 int anim abc_popup_exit 0x7f050004 int anim abc_shrink_fade_out_from_bottom 0x7f050005 int anim abc_slide_in_bottom 0x7f050006 int anim abc_slide_in_top 0x7f050007 int anim abc_slide_out_bottom 0x7f050008 int anim abc_slide_out_top 0x7f050009 int anim design_bottom_sheet_slide_in 0x7f05000a int anim design_bottom_sheet_slide_out 0x7f05000b int anim design_fab_in 0x7f05000c int anim design_fab_out 0x7f05000d int anim design_snackbar_in 0x7f05000e int anim design_snackbar_out 0x7f05000f int attr actionBarDivider 0x7f01003e int attr actionBarItemBackground 0x7f01003f int attr actionBarPopupTheme 0x7f010038 int attr actionBarSize 0x7f01003d int attr actionBarSplitStyle 0x7f01003a int attr actionBarStyle 0x7f010039 int attr actionBarTabBarStyle 0x7f010034 int attr actionBarTabStyle 0x7f010033 int attr actionBarTabTextStyle 0x7f010035 int attr actionBarTheme 0x7f01003b int attr actionBarWidgetTheme 0x7f01003c int attr actionButtonStyle 0x7f010058 int attr actionDropDownStyle 0x7f010054 int attr actionLayout 0x7f0100c6 int attr actionMenuTextAppearance 0x7f010040 int attr actionMenuTextColor 0x7f010041 int attr actionModeBackground 0x7f010044 int attr actionModeCloseButtonStyle 0x7f010043 int attr actionModeCloseDrawable 0x7f010046 int attr actionModeCopyDrawable 0x7f010048 int attr actionModeCutDrawable 0x7f010047 int attr actionModeFindDrawable 0x7f01004c int attr actionModePasteDrawable 0x7f010049 int attr actionModePopupWindowStyle 0x7f01004e int attr actionModeSelectAllDrawable 0x7f01004a int attr actionModeShareDrawable 0x7f01004b int attr actionModeSplitBackground 0x7f010045 int attr actionModeStyle 0x7f010042 int attr actionModeWebSearchDrawable 0x7f01004d int attr actionOverflowButtonStyle 0x7f010036 int attr actionOverflowMenuStyle 0x7f010037 int attr actionProviderClass 0x7f0100c8 int attr actionViewClass 0x7f0100c7 int attr activityChooserViewStyle 0x7f010060 int attr alertDialogButtonGroupStyle 0x7f010083 int attr alertDialogCenterButtons 0x7f010084 int attr alertDialogStyle 0x7f010082 int attr alertDialogTheme 0x7f010085 int attr allowStacking 0x7f010099 int attr arrowHeadLength 0x7f0100b8 int attr arrowShaftLength 0x7f0100b9 int attr autoCompleteTextViewStyle 0x7f01008a int attr background 0x7f01000c int attr backgroundSplit 0x7f01000e int attr backgroundStacked 0x7f01000d int attr backgroundTint 0x7f010118 int attr backgroundTintMode 0x7f010119 int attr barLength 0x7f0100ba int attr behavior_hideable 0x7f010098 int attr behavior_overlapTop 0x7f0100d7 int attr behavior_peekHeight 0x7f010097 int attr borderWidth 0x7f0100bf int attr borderlessButtonStyle 0x7f01005d int attr bottomSheetDialogTheme 0x7f0100b1 int attr bottomSheetStyle 0x7f0100b2 int attr buttonBarButtonStyle 0x7f01005a int attr buttonBarNegativeButtonStyle 0x7f010088 int attr buttonBarNeutralButtonStyle 0x7f010089 int attr buttonBarPositiveButtonStyle 0x7f010087 int attr buttonBarStyle 0x7f010059 int attr buttonPanelSideLayout 0x7f01001f int attr buttonStyle 0x7f01008b int attr buttonStyleSmall 0x7f01008c int attr buttonTint 0x7f0100a9 int attr buttonTintMode 0x7f0100aa int attr checkboxStyle 0x7f01008d int attr checkedTextViewStyle 0x7f01008e int attr closeIcon 0x7f0100dc int attr closeItemLayout 0x7f01001c int attr collapseContentDescription 0x7f01010f int attr collapseIcon 0x7f01010e int attr collapsedTitleGravity 0x7f0100a6 int attr collapsedTitleTextAppearance 0x7f0100a2 int attr color 0x7f0100b4 int attr colorAccent 0x7f01007b int attr colorButtonNormal 0x7f01007f int attr colorControlActivated 0x7f01007d int attr colorControlHighlight 0x7f01007e int attr colorControlNormal 0x7f01007c int attr colorPrimary 0x7f010079 int attr colorPrimaryDark 0x7f01007a int attr colorSwitchThumbNormal 0x7f010080 int attr commitIcon 0x7f0100e1 int attr contentInsetEnd 0x7f010017 int attr contentInsetLeft 0x7f010018 int attr contentInsetRight 0x7f010019 int attr contentInsetStart 0x7f010016 int attr contentScrim 0x7f0100a3 int attr controlBackground 0x7f010081 int attr counterEnabled 0x7f010101 int attr counterMaxLength 0x7f010102 int attr counterOverflowTextAppearance 0x7f010104 int attr counterTextAppearance 0x7f010103 int attr customNavigationLayout 0x7f01000f int attr defaultQueryHint 0x7f0100db int attr dialogPreferredPadding 0x7f010052 int attr dialogTheme 0x7f010051 int attr displayOptions 0x7f010005 int attr divider 0x7f01000b int attr dividerHorizontal 0x7f01005f int attr dividerPadding 0x7f0100c4 int attr dividerVertical 0x7f01005e int attr drawableSize 0x7f0100b6 int attr drawerArrowStyle 0x7f010000 int attr dropDownListViewStyle 0x7f010071 int attr dropdownListPreferredItemHeight 0x7f010055 int attr editTextBackground 0x7f010066 int attr editTextColor 0x7f010065 int attr editTextStyle 0x7f01008f int attr elevation 0x7f01001a int attr errorEnabled 0x7f0100ff int attr errorTextAppearance 0x7f010100 int attr expandActivityOverflowButtonDrawable 0x7f01001e int attr expanded 0x7f010024 int attr expandedTitleGravity 0x7f0100a7 int attr expandedTitleMargin 0x7f01009c int attr expandedTitleMarginBottom 0x7f0100a0 int attr expandedTitleMarginEnd 0x7f01009f int attr expandedTitleMarginStart 0x7f01009d int attr expandedTitleMarginTop 0x7f01009e int attr expandedTitleTextAppearance 0x7f0100a1 int attr fabSize 0x7f0100bd int attr foregroundInsidePadding 0x7f0100c1 int attr gapBetweenBars 0x7f0100b7 int attr goIcon 0x7f0100dd int attr headerLayout 0x7f0100cf int attr height 0x7f010001 int attr hideOnContentScroll 0x7f010015 int attr hintAnimationEnabled 0x7f010105 int attr hintEnabled 0x7f0100fe int attr hintTextAppearance 0x7f0100fd int attr homeAsUpIndicator 0x7f010057 int attr homeLayout 0x7f010010 int attr icon 0x7f010009 int attr iconifiedByDefault 0x7f0100d9 int attr imageButtonStyle 0x7f010067 int attr indeterminateProgressStyle 0x7f010012 int attr initialActivityCount 0x7f01001d int attr insetForeground 0x7f0100d6 int attr isLightTheme 0x7f010002 int attr itemBackground 0x7f0100cd int attr itemIconTint 0x7f0100cb int attr itemPadding 0x7f010014 int attr itemTextAppearance 0x7f0100ce int attr itemTextColor 0x7f0100cc int attr keylines 0x7f0100ab int attr layout 0x7f0100d8 int attr layoutManager 0x7f0100d2 int attr layout_anchor 0x7f0100ae int attr layout_anchorGravity 0x7f0100b0 int attr layout_behavior 0x7f0100ad int attr layout_collapseMode 0x7f01009a int attr layout_collapseParallaxMultiplier 0x7f01009b int attr layout_keyline 0x7f0100af int attr layout_scrollFlags 0x7f010025 int attr layout_scrollInterpolator 0x7f010026 int attr listChoiceBackgroundIndicator 0x7f010078 int attr listDividerAlertDialog 0x7f010053 int attr listItemLayout 0x7f010023 int attr listLayout 0x7f010020 int attr listPopupWindowStyle 0x7f010072 int attr listPreferredItemHeight 0x7f01006c int attr listPreferredItemHeightLarge 0x7f01006e int attr listPreferredItemHeightSmall 0x7f01006d int attr listPreferredItemPaddingLeft 0x7f01006f int attr listPreferredItemPaddingRight 0x7f010070 int attr logo 0x7f01000a int attr logoDescription 0x7f010112 int attr maxActionInlineWidth 0x7f0100e5 int attr maxButtonHeight 0x7f01010d int attr measureWithLargestChild 0x7f0100c2 int attr menu 0x7f0100ca int attr multiChoiceItemLayout 0x7f010021 int attr navigationContentDescription 0x7f010111 int attr navigationIcon 0x7f010110 int attr navigationMode 0x7f010004 int attr overlapAnchor 0x7f0100d0 int attr paddingEnd 0x7f010116 int attr paddingStart 0x7f010115 int attr panelBackground 0x7f010075 int attr panelMenuListTheme 0x7f010077 int attr panelMenuListWidth 0x7f010076 int attr popupMenuStyle 0x7f010063 int attr popupTheme 0x7f01001b int attr popupWindowStyle 0x7f010064 int attr preserv