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Keishin Yokomaku
November 28, 2017
Technology
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WebView😇😇😇
Keishin Yokomaku
November 28, 2017
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Transcript
WebView Keishin Yokomaku (@KeithYokoma) / potatotips #45
WebView Keishin Yokomaku 2 potatotips #45 Drivemode, Inc. / Principal
Engineer @KeithYokoma: GitHub / Twitter / Qiita / Tumblr / Stack Overflow
3 WebView
WebView Կ͔ͱ᠘ͷଟ͍ WebView ▸ Θ͔Δ ▸ ੲSIGSEGVβϥͩͬͨཕݪͷΑ͏ͳͷ 4 potatotips #45
WebView ChromeCustomTabs ͕͋Δ͔Β WebView ͍Βͳ͍ࢠ ▸ ͦΜͳ;͏ʹߟ͍͑ͯͨ࣌ظ͕Θͨ͠ʹ͋Γ·ͨ͠ 5 potatotips #45
WebView ·ͩ WebView Ͱফ͍ͯ͠Δͷʁ ▸ Θ͍ͨͯ͠͠·͢ 6 potatotips #45
WebView ࠓͷ WebView ᠘Ϩγϐ ▸ e.g. ๏తใΛ WebView Ͱදࣔ͢Δ ▸
assets ʹ html Λஔ͍ͯ WebView ʹಡ·ͤΔ ▸ ֎෦ϦϯΫ͕ͳ͚Ε࠷खܰʹࡁ·ͤΒΕΔ ▸ ಉ͡ assets ͷ html ʹϦϯΫ͢Δ߹؆୯ ▸ e.g. file:///android_asset/privacy_policy.html 7 potatotips #45
WebView StrictMode ▸ ThreadPolicy ͱ VmPolicy ▸ ͋Γ͕ͪͳ࣮ͷؒҧ͍Λݕग़ͯ͠ϩάग़ྗΫϥογϡΛൃੜͤ͞Δ ▸ ϝΠϯεϨουͰ
I/O ▸ Ϧιʔεͷ close Ε ▸ ΧελϜ͢Δͱ͖ඞཁͳͷͯ͢Λ༗ޮʹ͢Δ ▸ ༗ޮʹͯ͠ͳ͍ͷεϧʔ͞ΕΔ 8 potatotips #45
WebView Android Nougat ͷηΩϡϦςΟ༷ ▸ FileUriExposureException ▸ File εΩʔϚͷ Uri
Λ Intent ʹ͍Εͯڞ༗Ͱ͖ͳ͘ͳͬͨ ▸ FileProvider ͷ ContentProvider Ͱڞ༗͢Δ ▸ StrictMode ʹΦϓγϣϯ͕͋Δ ▸ VmPolicy#penaltyDeathOnFileUriExposure() 9 potatotips #45
WebView WebView#loadUrl() ͷ༷ ▸ WebViewClient Λࢦఆͨ͠ͱ͖ ▸ shouldOverrideUrlLoading ͕ true:
ΞϓϦͰಡΈࠐΈΛཧ ▸ shouldOverrideUrlLoading ͕ false: WebView ͕ಡΈࠐΈΛཧ ▸ WebViewClient Λࢦఆ͠ͳ͍ͱ͖ ▸ ActivityManager ʹ͍߹ΘͤͯదͳͷΛݺͼग़͢ 10 potatotips #45
WebView WebView#loadUrl() ͷ༷ ▸ WebViewClient Λࢦఆͨ͠ͱ͖ ▸ shouldOverrideUrlLoading ͕ true:
ΞϓϦͰಡΈࠐΈΛཧ ▸ shouldOverrideUrlLoading ͕ false: WebView ͕ಡΈࠐΈΛཧ ▸ WebViewClient Λࢦఆ͠ͳ͍ͱ͖ ▸ ActivityManager ʹ͍߹ΘͤͯదͳͷΛݺͼग़͢ 11 potatotips #45
WebView ActivityManager ʹ͍߹ΘͤͯదͳͷΛݺͼग़͢ ▸ Intent Λ͛ͯϋϯυϧͯ͘͠ΕΔΞϓϦΛ୳͢ ▸ ଘࡏ͢ΕͦͪΒʹ͢ ▸ ଘࡏ͠ͳ͚Ε
WebView ͕ϋϯυϧ͢Δ ▸ ͍ͣΕʹͯ͠ Intent ʹಡΈࠐΉ Uri ͕٧Ίࠐ·ΕΔ 12 potatotips #45
WebView ActivityManager ʹ͍߹ΘͤͯదͳͷΛݺͼग़͢ ▸ Intent Λ͛ͯϋϯυϧͯ͘͠ΕΔΞϓϦΛ୳͢ ▸ ଘࡏ͢ΕͦͪΒʹ͢ ▸ ଘࡏ͠ͳ͚Ε
WebView ͕ϋϯυϧ͢Δ ▸ ͍ͣΕʹͯ͠ Intent ʹಡΈࠐΉ Uri ͕٧Ίࠐ·ΕΔ ▸ file:///android_asset/hogehoge.html ͳϦϯΫΛ౿Ήͱ… 13 potatotips #45
14 potatotips #45
WebView WebView Λ͏ͱ͖ͷڭ܇ ▸ WebViewClient Λ͖ͪΜͱ͍·͠ΐ͏ ▸ ֎෦ϦϯΫ JavaScript ͕ͳ͍͔ΒͱݴͬͯԿ͠ͳͯ͘Α͍Θ͚Ͱͳ͍
15 potatotips #45
WebView Keishin Yokomaku (@KeithYokoma) / DroidKaigi 2017
Drivemode We are hiring! 17 potatotips #45
Drivemode We are hiring! 18 potatotips #45
DroidKaigi DroidKaigi 2018 is coming soon! ▸ Ticket: ▸ Early
Bird: 9,800 JPY ▸ Regular: 12,000 JPY ▸ Students: 4,000 JPY 19 potatotips #45