RecyclerViewでViewPagerっぽいの作ろうとして頓死した話

by bigbackboom

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RecyclerViewͰ ViewPagerͬΆ͍ͷ࡞ Ζ͏ͱͯ͠಴ࢮͨ͠࿩

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ࣗݾ঺հ • ໊લɿ٠஑/bigbackboom • ʢͳΜͪΌͬͯʣAndroid։ൃऀ • ॴଐɿגࣜձࣾΞΠελΠϧ -> CBCloudגࣜձࣾ • גࣜձࣾΞΠελΠϧͰ͸αʔόʔαΠυ(golang)ͷ։ൃ΋݉೚ • ໨ࢦͤʲ;Δͨͬ͘͢ʳ

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ViewPagerͱ͸ʁ • λϒͷ͋Δը໘ͷ࡞੒ • λϒλοϓͰͷը໘ભҠ͕Մೳ • εϫΠϓͰͷը໘ͷભҠ͕Մೳ • ॳظબ୒ͷը໘ͱࠨӈͷը໘Λ͋Β͔ ͡ΊॳظԽ͕Մೳ

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ଞʹ΋ʁ • ΧϧʔηϧͳΜ͔΋࡞ΕΔ • ϫϯεϫΠϓͰҰݸͣͭҠಈ͢ΔΧʔ υ • ࠨӈʹνϥݟͷΧʔυΛ഑ஔ͢Δ͜ͱ ΋Մೳ

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ͳͥRecyclerViewͰ࡞Δͷʁ • ViewPagerͰΧϧʔηϧ࡞Ζ͏ͱͨ͠Β͸Ұ౓ը໘֎ʹΧʔυΛ ग़͞ͳ͍ͱɺߋ৽͕ը໘ʹදࣔ͞Εͳ͍঱ঢ়͕ग़ͨɻ • ΧϧʔηϧͷΧʔυ࡟আ΋ɺը໘֎ʹग़͢ඞཁ͕͋Δɻ

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͜ΜͳΧϧʔηϧΛ࡞ͬͨͱ͖

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σʔλ͕มߋ͞Εͯ΋ɾɾɾ

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Ұ౓ը໘֎΁

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Α͏΍͘಺༰͕มΘΔ

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࡟আͷ৔߹΋

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3Λ࡟আʂ൓ө͞Εͣ...

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Ұ౓ը໘֎ʹग़ͯ͠

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࡟আ͕൓ө

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Ͱ΋RecyclerViewͳΒ • ߋ৽͕ଈ࣌൓ө • Ϧιʔεͷ࢖༻΋গͳΊ

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ํ਑ • ϫϯεϫΠϓͰɺΧʔυ͕Ұݸಈ͘εϫΠϓΛ࣮ݱ • ແݶͷεΫϩʔϧΛ࣮ݱ͢Δ

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Χʔυ͕Ұݸಈ͘εϫΠϓΛ࣮ݱ • PagerSnapΛRecyclerViewʹ౉͚ͩ͢ͰOK val helper = PagerSnapHelper() helper.attachToRecyclerView(this)

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ແݶͷεΫϩʔϧΛ࣮ݱ͢Δ • ͪ͜ΒΛࢀߟʹ͠·ͨ͠ • ϦετΛ3ηοτ༻ҙͯ͠ɺ̎ηοτ໨ʹ͋Β͔͡ΊҐஔΛઃఆ ͢Δ • εϫΠϓͰ̎ηοτ໨͔Β֎ΕΑ͏ͱͨ͠Βɺ2ηοτ໨ͷ͍ͣ Ε͔ͷ৔ॴʹڧ੍εΫϩʔϧͤ͞Δɻ

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݁Ռ

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why? • ॳظҐஔΛ͏·͍͜ͱઃఆͰ͖ͣɺ Χʔυ͕ਅΜதʹͳΒͳ͍ࣄ৅͕ଟൃ ͢Δ • εϫΠϓ͢ΔͱมͳҐஔʹͳΔ໰୊

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େࣦഊ • ݁Ռతʹ࣌ؒͳ͍ʹͰ͖ͦ͏ʹͳ͍ͷͰɺ͜ͷ࣌͸طଘ࣮૷Λ ར༻͢Δܗʹ͠·ͨ͠ɻ • ײ૝ɿ • ΍ͬͪ·ͬͨͳ͊ • ViewPager࢖͏࣌͸اըͱͷ࢓༷֬ೝΛগ͠ࡉ͔͘٧ΊΔΑ ͏ʹ͠Α͏ͱࢥͬͨɻ • https:/ /github.com/BigBackBoom/LoopingPagerSnapViewer